Tektronix 7B92A Maintenance Manual

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ARMY TM 11-6625-2925-24

AIR FORCE TO 33A1-10-242-2

ORGANIZATIONAL, DIRECT SUPPORT, AND GENERAL SUPPORT

MAINTENANCE MANUAL

DUAL TIME BASE, TEKTRONIX MODEL 7B92A

(NSN 6625-01-027-0265)

DEPARTMENTS OF THE ARMY AND THE AIR FORCE

21 JULY 1980

WARNING

DANGEROUS VOLTAGES EXIST IN THIS EQUIPMENT

Dangerous potentials exist at several points throughout this equipment. When the equipment is operated with the covers removed DO NOT touch exposed connections or components. Some trans istors have voltages present on their cases. Disconnect power before cleaning the equipment or replacing parts.

DON’T TAKE CHANCES!

TM 11-6625-2925-24

TO 33A1-10-242-2

Technical Manual ) DEPARTMENTS OF THE ARMY No. 11-6625-2925-24 ) AND THE AIR FORCE TO 33A1-10-242-2 ) Washington, DC, 21 July 1980

ORGANIZATIONAL, DIRECT SUPPORT, AND GENERAL SUPPORT

MAINTENANCE MANUAL

DUAL TIME BASE, TEKTRONIX MODEL 7B92A

(NSN 6625-01-027-0265)

REPORTING ERRORS AND RECOMMENDING IMPROVEMENTS

You can help improve this manual. If you find any mistakes or if you know of a way to improve the procedures, please let us know. Mail your letter or DA Form 2028 (Recommended Changes to Publications and Blank Forms) direct to: Commander, US Army Communications and Electronics Materiel Readiness Command and Fort Monm outh, AT T N: DRSEL-ME- MQ, Fort Monm outh, New Jer sey

07703.

For Air Force, submit AFTO Form 22 (T echnical Order System Publication Improvem ent Report and Reply) in accordance with paragraph 6-5, Section VI, T.O. 00-5-1. Forward direct to prime ALC/MST.

In either case, a reply will be furnished direct to you.

SECTION 0 INTRODUCTION

Scope............................................................................................................................................ 0-1

Indexes of Publications ................................................................................................................. 0-1

Maintenance Forms, Records, and Reports ................................................................................. 0-1

Reporting Equipment Improvement

Recommendations (EIR)............................................................................................................ 0-1

Destruction of Army Electronics Materiel ...................................................................................... 0-1

TABLE OF CONTENTS

Page

LIST OF ILLUSTRATIONS........................................................................................................... v

SAFETY SUMMARY..................................................................................................................... vii

SECTION 1 OPERATING INSTRUCTIONS

INTRODUCTION........................................................................................................................... 1-1

INSTALLATION............................................................................................................................. 1-1

FRONT-PANEL CONTROLS, CONNECTORS, AND INDICATORS ........................................... 1-2

Main Triggering Controls............................................................................................................ 1-2

Sweep Controls.......................................................................................................................... 1-4

Delayed Triggering Controls ...................................................................................................... 1-5

Front-Panel Inputs...................................................................................................................... 1-5

FUNCTIONAL CHECK.................................................................................................................. 1-5

Setup Procedure........................................................................................................................ 1-6

Sweep Functions........................................................................................................................ 1-6

Triggering Functions .................................................................................................................. 1-7

GENERAL OPERATING INFORMATION..................................................................................... 1-8

Main Triggering.......................................................................................................................... 1-8

Main Trigger Modes................................................................................................................... 1-8

Main Trigger Coupling................................................................................................................ 1-9

Main Trigger Source................................................................................................................... 1-10

Input Impedance ........................................................................................................................ 1-10

Trigger Slope.............................................................................................................................. 1-10

Trigger Level.............................................................................................................................. 1-10

Selecting Sweep Rates.............................................................................................................. 1-12

Time Measurement.................................................................................................................... 1-12

Display Modes............................................................................................................................ 1-12

Delay Time Multiplier.................................................................................................................. 1-13

Delayed Sweep Triggering......................................................................................................... 1-13

7B92A

TABLE OF CONTENTS

Page

SECTION 2 SPECIFICATION........................................................................................................................... 2-1

THE FOLLOWING SERVICING INSTRUCTIONS ARE FOR USE BY QUALIFIED PERSONNEL ONLY. TO AVOID PERSONAL INJURY, DO NOT PERFORM ANY SERVICING OTHER THAN THAT CONTAINED IN OPERATING INSTRUCTIONS UNLESS YOU ARE QUALIFIED TO DO SO.

SECTION 3 THEORY OF OPERATION

Block Diagram Description............................................................................................................ 3-1

Detailed Circuit Description........................................................................................................... 3-1

Main Trigger Generator............................................................................................................ 3-1

Delaying Sweep Generator...................................................................................................... 3-3

Delayed Trigger Generator.......................................................................................................3-4

Delayed Sweep Generator....................................................................................................... 3-6

Horizontal Logic........................................................................................................................ 3-6

Output Amplifier........................................................................................................................ 3-7

Readout.................................................................................................................................... 3-7

7B92A

TABLE OF CONTENTS (cont)

SECTION 4 MAINTENANCE............................................................................................................................ Page

Preventive Maintenance................................................................................................................ 4-1

Cleaning ................................................................................................................................... 4-1

Visual Inspection ...................................................................................................................... 4-1

Lubrication................................................................................................................................ 4-1

Semiconductor Checks ............................................................................................................ 4-2

Adjustment After Repair........................................................................................................... 4-2

Troubleshooting............................................................................................................................. 4-3

Troubleshooting Aids................................................................................................................ 4-3

Troubleshooting Equipment ..................................................................................................... 4-6

Troubleshooting Techniques.................................................................................................... 4-6

Corrective Maintenance ................................................................................................................ 4-8

Obtaining Replacement Parts .................................................................................................. 4-8

Soldering Techniques............................................................................................................... 4-8

Component Removal and Replacement .................................................................................. 4-9

Adjustment After Repair........................................................................................................... 4-11

Repackaging For Shipment...................................................................................................... 4-11

SECTION 5 PERFORMANCE CHECK/CALIBRATION

Preliminary Information ............................................................................................................ 5-1

Test Equipment Required......................................................................................................... 5-1

Part I Performance Check............................................................................................................. 5-4

Outline for Part I Performance Check ...................................................................................... 5-4

A. Trigger Sensitivity........................................................................................................... 5-4

B. Horizontal System.......................................................................................................... 5-4

Preliminary Procedure.............................................................................................................. 5-4

A. Trigger Sensitivity................................................................................................................ 5-5

B. Horizontal System............................................................................................................... 5-10

Part II Calibration........................................................................................................................... 5-16

Outline for Part II Calibration.................................................................................................... 5-16

A. Trigger Sensitivity (SN B070000-above)........................................................................ 5-16

B. Trigger Sensitivity (SN B069999-below)........................................................................ 5-16

C. Horizontal System.......................................................................................................... 5-17

Preliminary Procedure......................................................................................................... 5-17

A. Trigger Sensitivity (SN B070000-above)............................................................................. 5-18

B. Trigger Sensitivity (SN B069999-below)............................................................................. 5-25

C. Horizontal System............................................................................................................... 5-33

SECTION 6 OPTIONS

SECTION 7 REPLACEABLE ELECTRICAL PARTS

SECTION 8 DIAGRAMS AND CIRCUIT BOARD ILLUSTRATIONS

SECTION 9 REPLACEABLE MECHANICAL PARTS

Change Information

iii

TM 11-6625-2925-24/TO 33A1-10-242-2

TABLE OF CONTENTS (CONT)

Page

APPENDIX A REFERENCES................................................................................................................. A-1

APPENDIX B MAINTENANCE ALLOCATION

Section I. Introduction....................................................................................................................... B-1

II. Maintenance Allocation Chart for Dual Time

Base, Tektronix Model 7B92A..................................................................................... B-3

III. Tool and Test Equipment Requirements for Dual

Time Base, Tektronix Model 7B92A............................................................................ B-4

IV. Remarks........................................................................................................................... B-5

APPENDIX C REPAIR PARTS AND SPECIAL TOOLS LIST (RPSTL)

(Not applicable)

APPENDIX D EXPENDABLE SUPPLIES AND MATERIALS LIST

(Not applicable)

7B92A

LIST OF ILLUSTRATIONS

Figure No. Page

Frontispiece 7B92A Dual Time Base

1-1 Location of Variable and Mainframe Selector multi-pin connectors ....................................... 1-1

1-2 Location of release latch......................................................................................................... 1-2

1-3 Front-panel controls and connectors...................................................................................... 1-3

1-4 Effect of MAIN TRIGGERING LEVEL and SLOPE controls on crt display............................. 1-11

1-5 Area of graticule used for most accurate time measurements ............................................... 1-12

1-6 Typical alternate sweep display.............................................................................................. 1-13

2-1 Dimensional drawing............................................................................................................... 2-5

4-1 Lubrication procedure for a typical cam switch....................................................................... 4-2

4-2 Semiconductor lead configurations......................................................................................... 4-4

4-3 Inter-board multi-pin connector assembly............................................................................... 4-5

4-4 End-lead multi-pin connector assembly.................................................................................. 4-5

4-5 Location of pin numbers of Interface connector ..................................................................... 4-5

5-1 Main Triggering level range.................................................................................................... 5-6

5-2 Delayed Triggering level range............................................................................................... 5-6

5-3 Variable Time/Division range.................................................................................................. 5-13

5-4 Fast delay time accuracy........................................................................................................ 5-14

5-5 DC balance. (Circle denotes correct trigger point.)................................................................ 5-19

5-6 Trigger Sensitivity. (Circle denotes correct trigger point.)...................................................... 5-19

5-7 Main Triggering level range. (Circle denotes triggering limits.).............................................. 5-19

5-8 Delayed Triggering level range. (Circle denotes triggering limits.)........................................ 5-21

5-9 DC balance. (Circle denotes correct trigger point.)................................................................ 5-26

5-10 Trigger sensitivity. (Circle denotes correct trigger point.) ...................................................... 5-26

5-11 Main Triggering level range. (Circle denotes triggering limits.).............................................. 5-27

5-12 Delayed Triggering level range. (Circle denotes triggering limits.)........................................ 5-29

5-13 Correct DTM Scale and Delay Start adjustment (circle)......................................................... 5-34

5-14 Variable Time/Division range.................................................................................................. 5-38

5-15 Fast delay time accuracy........................................................................................................ 5-39

LIST OF ILLUSTRATIONS (cont)

The illustrations in Section 8 are located near their associated diagrams on the foldout pages.

Figure No.

8-1 Circuit board locations

8-2 Block diagram

8-3 A3 Coupling Switch circuit board

8-4 A5 Delayed Triggering Switch circuit board

8-5 A2 Source Switch circuit board

8-6 A4 Mode Switch circuit board

8-7 Al External Input circuit board

8-8 A8 Main Trigger circuit board (SN B070000-above)

8-9 A8 Main Trigger circuit board (SN B069999-below) 8-10 A9 Delayed Trigger circuit board (SN B070000-above) 8-11 A9 Delayed Trigger circuit board (SN B069999-below) 8-12 A6 Interface circuit board 8-13 A6 Interface circuit board 8-14 A6 Interface circuit board 8-15 A7 Logic circuit board (SN B059999-below) 8-16 A7 Logic circuit board (SN B060000-above) 8-17 A12 Readout circuit board 8-18 Location of Sweep Timing adjustments 8-19 Location of Main Trigger adjustments (SN B069999-below) 8-20 Location of Delayed Trigger adjustments (SN B069999-below) 8-21 Location of Main Trigger adjustments (SN B070000-above) 8-22 Location of Delayed Trigger adjustments (SN B070000-above)

7B92A

LIST OF TABLES

Table No. Page No.

2-1 Electrical Characteristics..........................................................................................................................2-1

2-2 Environmental...........................................................................................................................................2-4

2-3 Physical.....................................................................................................................................................2-4

3-1 7B92A Readout Character Selection........................................................................................................3-8

5-1 Test Equipment.........................................................................................................................................5-2

5-2 Sweep Timing...........................................................................................................................................5-11

5-3 Fast Timing...............................................................................................................................................5-12

5-4 Fast Sweep Linearity.................................................................................................................................5-12

5-5 Differential Delay Time Accuracy..............................................................................................................5-13

5-6 Fast Differential Delay Time Accuracy......................................................................................................5-14

5-7 Sweep Timing...........................................................................................................................................5-36

5-8 Fast Timing...............................................................................................................................................5-37

5-9 Fast Sweep Linearity.................................................................................................................................5-37

5-10 Differential Delay Time Accuracy..............................................................................................................5-39

5-11 Fast Differential Delay Time Accuracy......................................................................................................5-39

7B92A

SAFETY SUMMARY

This manual contains safety information that the user must follow to ensure safe operation of this instrument. WARNING information is intended to protect the operator; CAUTION information is intended to protect the instrument. The following are general safety precautions that must be observed during all phases of operation and maintenance.

Ground the Instrument

To reduce electrical-shock hazard, the mainframe (oscilloscope) chassis must be properly

grounded. Refer to the mainframe manual for grounding information. Do Not Operate in Explosive Atmosphere

Do not operate this instrument in an area where flammable gases or fumes are present. Such

operation could cause an explosion. Avoid Live Circuits

Electrical-shock hazards are present in this instrument. The protective instrument cov ers must

not be removed by operating personnel. Component replacement and internal adjustments must

be referred to qualified service personnel. Do Not Service or Adjust Alone

Do not service or make internal adjustments to this instrument unless another person, capable of

giving first aid and resuscitation, is present.

Warning Statements

Warning statements accompany potentially dangerous procedures in this manual. The following

warnings appear in this manual and are listed here for additional emphasis.

To avoid electrical shock, disconnect the instrument from the power source before soldering.

To avoid electrical shock, disconnect the instrument from the power source before replacing

components.

Handle silicone grease with care. Avoid getting silicone grease in eyes. Wash hands thoroughly

after use.

vii

7B92A

viii

REV B, JUN 1978

TM 11-6625-2925-24/T0 33A1-10-242-2

SECTION 0

INTRODUCTION

0-1. Scope

This manual contains instructions for organizational, direct support, and general support maintenance of Dual Time Base, Tek tronix Model 7B92A. Throughout this manual Dual T ime Base, Tektr onix Model 7B92A is referred to as the 7B92A.

0-2. Indexes of Publications

a. DA Pam 310-4 changes, or additional publications pertaining to the equipment.

b. DA Pam 310-7 pertaining to the equipment.

0-3. Maintenance Forms, Records, and Reports

a. Reports of Maintenance and Unsatisfac tor y Equipment for equipment m aintenance will be those prescribed by TM 38-750, T he Arm y Maintenance Management System (Arm y). Air Force personnel will use AFM 66-1 for maintenance reporting and TO-00-35D54 for unsatisfactory equipment reporting.

b. Report of Packaging and Handling Deficiencies Report) as prescribed in AR 735-11-2/NAVSUPINST 4440.127E/AFR 400-54/MCO 4430.3E and DSAR 4140.55.

c. Disc repancy in Shipment Report (DISREP) (SF 361) (DISREP) (SF 361) as prescribed in AR 55-38/NAVSUPINST 4610.33B/AFR 75-18/MCO P4610.19C and DLAR 4500.15.

0-4. Reporting Equipment Improvement Recommendations (EIR)

a. Army can tell us what you don’t like about your equipment. Let us know why you don’t like the design. Tell us why a procedure is hard to perform. Put it on an SF 368 (Quality Deficiency Report). Mail it to Comm ander, US Ar my Communications and Electronics Materiel Readiness Command and Fort Monmouth, ATTN: DRSEL-ME-MQ, Fort Monmouth, New Jersey

07703. We’ll send you a reply.

. If your 7B92A needs improvement, let us k now. Send us an EIR. You, the user, are the only one who

. Refer to the latest issue of DA Pam 310-4 to determine whether there are new editions,

. Refer to DA Pam 310-7 to determ ine whether there are modific ation work orders (MWO ’s)

. Department of the Army form s and pr ocedures us ed

. Fill out and forward DD Form 6 (Pac kaging Improvement

. Fill out and forward Discrepancy in Shipment Report

b. Air Force

0-5. Destruction of Army Electronics Materiel

Destruction of Army electronics materiel to prevent enemy use shall be in accordance with TM 750-244-2.

. Air Force personnel are encouraged to submit EIR’s in accordance with AFM 900-4.

0-1

OPERATING INSTRUCTIONS

Section 1-7B92A

INTRODUCTION

The 7B92A Dual Time Base unit provides normal, delayed, intensified, and alternate sweep operation for TEKTRONIX 7000-Series Oscilloscopes. Calibrated sweep rates from 0.2 second to 0.5 nanosecond and triggering to 500 megahertz are provided. The 7B92A is intended for use with highfrequency 7000-Series Oscilloscope systems; however, most 7B92A functions are compatible with all 7000Series Oscilloscopes.

Other features include lighted pushbutton switches, compatibility with indicator oscilloscopes having an alphanumeric readout system, and 0 to 9.8 times continuous sweep delay. A VARIABLE control allows continuously variable sweep rates between calibrated steps. Also, when operating in the AUTO MAIN TRIGGERING Mode, a bright base line is displayed in the absence of a trigger signal.

This section describes the operation of the frontpanel controls and connectors, and provides a functional check and general operating information for this instrument.

NOTE

The ALT OFF position, which allows

the Intensified mode of operation, is

applicable to instruments SN

B060000-above.

INSTALLATION

The 7B92A is designed to operate in the horizontal plug-in compartment of the oscillosc ope. This instrument can also be installed in a vertical plug-in compartment to provide a vertical sweep on the crt. However, when used in this manner, there are no internal triggering or retrace blanking provisions, and the unit may not meet the specifications given in the Specification section of this manual.

Before proceeding with installation, check the settings of the Time/Div Variable Selector multi-pin connector and the Mainframe Selector multi-pin connector (see Fig. 1-1). The Time/Div Variable Selector determines whether the front-panel Time/Div VARIABLE control operates in conjunction with the delaying or delayed sweeps. The Mainframe Selector adapts the 7B92A to the oscillsocope mainframe being used. The two mainframe selections are:

1. 7800 and 7900-Series Oscilloscopes.

2. All other 7000-Series Oscilloscopes.

NOTE

The 7B71 will not delay the 7B92A for

displaying alternating Delaying and

Delayed sweeps. Instead, it causes a

sweep lock-up to occur under the

following conditions; with the 7B71 in

the A horizontal compartment

REV B, JUN 1978

Fig. 1-1. Location of Variable and Mainframe Selector multi-pin conectors.

1-1

Operating Instructions-7B92A

and the 7B92A in the B horizontal compartment, the sweep locks up if the 7B92A is in its Alternate mode and the Mainframe Horizontal mode is Alt. Lock-up can be avoided by changing the Mainframe Horizontal mode to Chop or B. This allows both 7B92A sweeps to be displayed.

To install the 7B92A in a plug-in compartment, push it in until it fits firmly into the compartment. The front panel of the 7B92A should be flush with the front panel of the oscilloscope. Even though the gain of the oscilloscope is standardized, the sweep calibra tion of the 7B92A should be checked when installed. The procedure for checking the unit is given under Sweep Calibration in the Operating Checkout procedur e In this section.

To remove the 7B92A, pull the release latch (see Fig. 1-2) to disengage the unit from the os c illos cope, and pull it out of the plug-in compartment.

Information. Fig. 1-1shows the Time/Div Variable and Mainframe Selectors. Fig. 1-3 shows the front-panel controls, connectors, and indicators.

MAIN TRIGGERING Controls

(1) LEVEL Control Selects amplitude point on trigger signal where sweep

triggering occurs when the MAIN TRIGGERING MODE AUTO, NORM, or SINGLE SWEEP switches are pressed. When the MAIN TRIGGERING MODE HF SYNC switch is pressed, the LEVEL control adjusts the frequency of the trigger generator to synchronize with the frequency (or sub-harmonic) of the triggering signal to provide a stable display.

(2) SLOPE Control Permits triggering on the positive or negative s lope of the

trigger signal (except in HF SYNC). (3) TRIG’D Indicator When lit, indicates that the sweep is triggered and will

produce a display with correct setting of the POSITION control and the controls on the assoc iated am plif ier plugin unit(s) and oscilloscope.

Fig. 1-2. Location of release latch.

FRONT-PANEL CONTROLS,

CONNECTORS, AND INDICATORS

All controls, connectors, and indicators r equired for the operation of the 7B92A, except the Time/Div Variable and Mainframe Selectors, are located on the front panel. A brief description of the front-panel controls, connectors, and indicators is given here. More detailed information is given under General Operating

(4) MODE Switches Select the desired MAIN TRIGGERING mode. Selec ted

mode is indicated by lighted pushbutton. AUTO: Selects a triggered sweep initiated by the applied

trigger signal at a point determined by the LEVEL control and SLOPE control when the trigger signal repetition rate is above 30 hertz and within the frequency range selected by the COUPLING switches. When the LEVEL control is outside the amplitude range, the trigger repetition rate is outside the frequency range selected by the COUPLING switches, or the trigger signal is inadequate, the sweep free-runs to provide a reference trace.

HF SYNC: Sweep initiated by trigger signals with repetition rates above 100 megahertz and within the range selected by the COUPLING switch. Stable display can be obtained when the LEVEL control adjusts the frequency of the trigger generator to the frequency (or sub-harmonic) of the trigger signal. When the LEVEL control is adjusted to frequencies between subharmonics, the sweep free-runs.

REV B, JUN 1978

1-2

Operating Instructions-7B92A

Fig. 1-3. Front-panel controls and connectors.

NORM: Sweep initiated by the applied trigger signal at a point selected by the LEVEL control and SLOPE contr ol over the frequency range selected by the COUPLING switches. Triggered sweep can be obtained only over the amplitude range of the applied trigger signal. W hen the LEVEL control is either outside the am plitude range, the trigger repetition rate is outside the fr equency range selected by the COUPLING switches, or the trigger signal is inadequate, there is no trace.

SINGLE SW EEP-RESET: When the SINGLE SWEEPRESET switch is pressed, a single trace will be presented when the next trigger pulse is received. The SINGLE SW EEP-RESET switch rema ins lit until REV B,

REV B, JUN 1978

JUN 1978 a trigger is received and the sweep is completed. The SINGLE SWEEP-RESET switch must be pressed again before another sweep can be displayed.

(5) COUPLING Switches Select trigger signal coupling. Selected coupling is

indicated by lighted pushbutton. AC: Rejects dc and attenuates ac signals below about

30 hertz. Accepts signals between 30 hertz and 500 megahertz.

1-3

Operating Instructions-7B92A

AC LF REJ: Rejects dc and attenuates signals below30 kilohertz. Accepts signals between 30 k ilohertz and 500 megahertz.

AC HF REJ. Rejects dc and attenuates signals above 50 kilohertz. Accepts signals from 30 hertz to 50 kilohertz. DC: Accepts all signals from dc to 500 megahertz.

(6) SOURCE Switches Select the triggering source. Selected source is indicated by lighted pushbutton.

INT: Trigger signal obtained internally from amplifier plug-in unit of oscilloscope.

LINE: Trigger signal obtained internally from the line voltage applied to the oscilloscope.

EXT: Trigger signal obtained from an external source applied to the MAIN TRIG IN connector.

EXT Þ 10: Trigger signal obtained from an external source applied to the MAIN TRIG IN c onnector. In this position, the external signal is attenuated before it is applied to the trigger circuit.

Sweep Controls

(7) TIME/DIV OR DLY TIME Selects the basic sweep rate for norm al s weep operation and selects the delay time (multiplied by the DELAY TIME MULT dial setting) when operating in the Alternate or Delayed sweep modes. The VARIABLE control m ust be in the CAL (knob in) position for calibrated sweep rate.

(8) DLY’D Time/Division Selects the delayed sweep rate for operation in Delayed and Alternate sweep modes. The VARIABLE control must be in the CAL (knob in) position for calibrated sweep rate. Four display modes can be selected by the following switch settings:

Normal Sweep: A normal sweep is selected when the TIME/DIV OR DLY TIME switch and the DLY’D Time/Division switches are lock ed together at the same sweep rate. The DLY’D Time/Division knob must be pressed in for normal sweep mode. Calibrated sweep rates from 0.2 second/division to 0.5 nanosecond/division can be selected

ALT Sweep: The Alternate mode is s elected when the DLY’D Time/Division switch is pulled out and rotated clockwise and the TRACE SEP control is turned clockwise from the ALT OFF pos ition. In this mode, the delaying sweep is displayed (with an intensified zone during the time that the delayed sweep runs) alternately with the delayed sweep.

Intensified Sweep: The Intensified mode, a function of the delaying and delayed sweeps is selected when the DLY’D Time/Division switch is pulled out and rotated clockwise, and the TRACE SEP control is rotated fully counterclockwise to the ALT OFF pos ition (see Fig. 1-3). In this mode, a portion of the delaying sweep is intensified during the time that the delayed sweep generator runs.

DLY’D Sweep: The Delayed sweep mode is selected when the DLY’D Time/Division switch is pulled out, rotated for the desired delayed sweep rate, and then pushed in. In this mode, the delayed sweep is displayed at a rate determined by the DLY’D Time/Division switch at the end of each delay period, as selected by the TIME/DIV OR DLY TIME switch and the DELAY TIME MULT dial setting.

(9) VARIABLE Two-position switch actuated by the VARIABLE control to select calibrated or uncalibrated sweep rates. In the CAL position (knob in) the VARIABLE control is inoperative and the sweep rate is calibrated. When pressed and released, the knob moves out to activate the VARIABLE control for uncalibrated sweep rates. The sweep rate in each TIME/DIV OR DLY TIME switch position can be reduced at least to the sweep rate of the next slower position. The VARIABLE control will operate with either the delaying or delayed sweep by means of the internal Time/Div Variable Selector.

(10) POSITION Control Positions the display horizontally on the graticule.

(11) CONTRAST Adjustment Varies the relative brightness of the intensified por tion of the delaying trace when in the Alternate mode.

(12) TRACE SEP/ALT OFF Control This control vertically positions the delaying sweep display up to 3.5 divisions above the delayed sweep display when in the Alternate mode. The ALT OFF position allows the Intensified sweep mode of operation, permitting the display of an intensified portion of the delaying sweep.

1-4

REV B, JUN 1978

Operating Instructions—7B92A

(13) INTENSITY Control Varies the intensity of the Intensified sweep only, when operating in the Intensified or Alternate mode (must be set near clockwise end when 7B92A is operating in some 7000-Series Oscilloscopes).

(14) SWP CAL Adjustment Screwdriver adjustment sets the basic timing of the 7B92A to compensate for slight differences in input sensitivity when changing indicator oscilloscopes.

(15) DELAY TIME MULT Dial Provides variable delay of 0 to 9.8 times the basic delay time selected by the TIME/DIV OR DLY TIME switch.

Delayed Triggering Controls

(16) LEVEL Control Determines the delayed trigger mode and the delayed trigger level.

RUNS AFTER DELAY TIME (LEVEL control turned fully clockwise into detent): Delayed sweep runs immediately following the delay time selected by the TIME/DIV OR DLY TIME switch and the DELAY TIME MULT dial. Delayed Slope, Coupling, and Source functions are inoperative.

INT: The delayed trigger signal is obtained from the vertical amplifier of the oscilloscope.

EXT: The delayed trigger signal is obtained from an external source connected to the DLY’D TRIG IN connector. (19) COUPLING Switch Two-position pushbutton switch to determ ine the m ethod of coupling the trigger signal to the delayed trigger circuit.

AC: Rejects dc and attenuates signals below 30 hertz. Accepts trigger signals from 30 hertz to 500 megahertz.

DC: Accepts trigger signals from dc to 500 megahertz.

Front-Panel Inputs

(20) MAIN TRIG IN Connector Serves as an external trigger input for the main tr iggering circuit when the MAIN TRIGGERING SOURCE EXT or EXT Þ 10 pushbutton switches are pressed.

(21) TERM Switch Two-position pushbutton switch to select 50 ohms (out position) or 1 megohm (in position) input impedance for the MAIN TRIG IN and DLY’D TRIG IN connectors.

Delayed Sweep Triggerable: When the Delayed Triggering LEVEL control is turned counterclock wise out of detent, the delayed sweep is triggerable. The Delayed Triggering LEVEL control can now be rotated to select the amplitude point on the trigger signal at which the delayed sweep is triggered. In the Delayed Sweep Triggerable mode, the delayed Slope, Coupling, and Source functions are activated.

(17) SLOPE Switch Two-position pushbutton switch to select the slope of the trigger signal which starts the delayed sweep.

+: The delayed sweep can be triggered on the positive slope of the trigger signal.

-: The delayed sweep can be triggered on the negative slope of the trigger signal.

(18) SOURCE Switch Two-position pushbutton switch to select the source of the delayed trigger signal.

REV A, JUN 1978

DLY’D TRIG IN Connector Serves as an external trigger input for the delayed

triggering circuit when the Delayed Triggering SOURCE switch is set to EXT.

Do not exceed 7 volts (rms) of external signal when 50 n termination is selected.

FUNCTIONAL CHECK

The following procedures may be used for familiarization or as a check of basic instrument operation. The procedure is divided into two parts, Sweep Functions and Triggering Functions. A complete operating check of the 7B92A functions c an be made by performing both parts, or each part may be performed separately. If performing the functional chec k procedur e reveals a malfunction or

1-5

Operating Instructions-7B92A

possible improper adjustment; first check the operation of the associated plug-in units, then refer to the instruction manual for maintenance and adjustment procedures.

NOTE For optimum high-frequency performance, the 7B92A should be installed in an oscilloscope system with similar frequency and sweeprate capabilities.

Setup Procedure

1. Install the 7B92A in a horizontal

compartment of the oscilloscope.

2. Install the amplifier plug-in unit in a

vertical compartment.

3. Turn on the oscilloscope and allow at least

20 minutes warm up.

4. Set the 7B92A controls as follows:

MAIN TRIGGERING

SLOPE (+) MODE AUTO COUPLING AC SOURCE INT

Delayed Triggering

LEVEL RUNS AFTER DELAY

TIME SLOPE (+) COUPLING AC SOURCE INT

Sweep Controls

POSITION Midrange INTENSITY As desired TIME/DIV OR 1 ms

DLY TIME DLY’D Time/Division 1 ms (knob in) VARIABLE CAL Time/Div Variable Delayed Sweep

Selector (internal) DELAY TIME MULT 1.00 TRACE SEP Midrange

5. Set the oscilloscope to display the plug-in units and adjust for a well-defined display. See oscilloscope and amplifier plug-in unit instruction m anuals for detailed operating instructions.

Sweep Functions

Normal Sweep. Perform the following

procedure to obtain a normal sweep and demonstrate the function of the related sweep controls:

1. Perform the Setup Procedure.

2. Connect a 4 volt, one-kilohertz signal from the oscilloscope calibrator to the amplifier plug-in unit input.

3. Adjust the amplifier plug-in unit volts/division switch for two divisions of display.

4. Rotate the MAIN TRIGGERING LEVEL control for a stable display.

5. Rotate the POSITION control and note that the trace moves horizontally.

6. Check the crt display for one complete cycle per division. If necessary, adjust the SWP CAL screwdriver adjustment for one complete cycle per division over the center eight graticule divisions. Be sure that the timing of the calibrator signal is accurate within

0.5%.

Alternate and Delayed Sweep. Perform the following procedure to obtain alternate-delayed sweeps and demonstrate the function of the related sweep controls:

7. Pull out the DLY’D Time/Division knob and rotate clockwise to 0.1 ms f or the Alternate s weep mode. Note both an intensified trace and a normal-intensity delayed sweep trace on the crt. Increased oscilloscope intensity may be required for viewing the delayed sweep.

8. Rotate the INTENSITY control and note that it varies the intensity of the delaying sweep.

9. Rotate the CONTRAST adjustment for adequate identification on the intensified portion of the delaying sweep when alternating with Delayed sweep.

NOTE When operating in the Intensified mode, the intensified zone is controlled by the intensity of the test oscilloscope instead of the 7B92A CONTRAST and INTENSITY controls.

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Operating Instructions—7B92A

10. Rotate the TRACE SEP control to vertically position the delaying sweep trace with respect to the delayed sweep trace. With the TRACE SEP control in the ALT OFF position, only the Intensified sweep will be displayed.

11. Rotate the DELAY TIME MULT dial and note that the amount of delay time before the intensif ied portion of the display is controlled by the DELAY TIME MULT dial.

12. Press the DLY’D Time/Division switch in for the Delayed sweep mode. Note the delayed display with sweep rate determined by the DLY’D Time/Division switch.

13. Press and release the VARIABLE control. Rotate the VARIABLE control and note that the sweep rate indicated by the DLY’D Time/Division switch can be varied to at least the sweep rate of the next adjacent position (0.2 ms). The internal Time/Div Variable Selector must be set to the Delayed Sweep position. Return the VARIABLE control to the CAL position (knob in).

Triggering Functions

Main and Delayed Triggering. Perform the

following procedure to obtain a triggered alternate, normal, or delayed sweep and demonstrate the function of the related controls:

14. Perform the Setup Procedure. Connect the one-kilohertz calibrator signal from the oscilloscope to the amplifier plug-in unit input and adj ust for about four divisions of vertical display.

15. Set the DLY’D Time/Division switch and the TIME/DIV OR DLY TIME switch to 1 ms, and press in the DLY’D Time/Division knob (normal sweep mode). Rotate the MAIN TRIGGERING LEVEL control for a stable display.

16. Check that a stable display can be obtained with the MAIN TRIGGERING COUPLING switch set to AC, AC HF REJ, and DC, for both the positive and negative positions of the SLOPE control (MAIN TRIGGERING LEVEL control may be adjusted as necessary to obtain a stable display). Remove all connections from the oscilloscope system.

17. Connect a 0.4 volt, one-kilohertz signal from the oscilloscope calibrator to the amplifier plug-in unit and to the MAIN TRIG IN connector. Set the MAIN TRIGGERING SOURCE switch to EXT. Set the amplifier plug-in unit volts/div switch for about four divisions of display. Check that a stable display can be obtained with the MAIN TRIGGERING COUPLING switch set to AC, AC HF REJ, and DC, for both the positive and negative positions of the SLOPE control (MAIN TRIGGERING LEVEL control m ay be adjusted as necessary for a stable display).

18. Change the MAIN TRIGGERING SOURCE switch to EXT Þ 10. Set the oscilloscope calibratorfor four volts at one kilohertz and adjust the amplifier plug-in unit volts/div switch for about four divisions of display. Check that a stable display can be obtained with the MAIN TRIGGERING COUPLING switch set to AC, AC HF REJ, and DC, for both the positive and negative positions of the SLOPE control (MAIN TRIGGERING LEVEL contr ol may be adjusted as necessary to obtain a stable display). Remove all connections from the oscilloscope system.

19. Set the MAIN TRIGGERING COUPLING switch to AC and SOURCE switch to INT. Connect a one-kilohertz calibrator signal from the oscilloscope to the amplifier plug-in unit input and adj ust for about four divisions of display amplitude. Adjust the MAIN TRIGGERING LEVEL control for a stable display. Set the MODE switch to NORM and check for a stable display. Change the MODE switch to AUTO and adjust the LEVEL control for a free-running display. Change the MODE switch to NORM and check for no display.

20. Adjust the MAIN TRIGGERING LEVEL control for a stable display. Change the MAIN TRIGGERING MODE switch to SINGLE SWEEP. Press the RESET button and check for one sweep as the RESET button is pressed. Remove the one-kilohertz signal from the amplifier plug-in unit and press the RESET button. Check for no dis play and RESET button light on. Connect the one-kilohertz signal to the amplifier plug-in unit input and check for one sweep as the signal is applied. Remove all connections from the oscilloscope system.

21. Set the MAIN TRIGGERING MODE switch to AUTO and SOURCE switch to AC. Turn the Delayed Triggering LEVEL control fully clockwise to the RUNS AFTER DELAY TIME position. Pull out the DLY’D Time/Division switch and rotate to 0.2 ms (Alternate mode). Connect a 0.4 volt, one-kiloher tz signal from the oscilloscope calibrator to the am plifier plug-in unit input and adjust for about two divisions of display amplitude. Rotate the MAIN TRIGGERING LEVEL control for a stable intensified display. The INTENSITY control may need to be adjusted to view the intensified display. Rotate the DELAY TIME MULT dial and note that the delay time before the intensified portion of display is continuously variable.

22. Set the Delayed Triggering SLOPE, COUPLING, and SOURCE switches to (+), AC, and INT. Rotate the Delayed Triggering LEVEL control counterclockwise out of the detent and adjust for a stable display. Rotate the

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Operating Instructions-7B92A

DELAY TIME MULT dial and note that the intensified sweep does not start at the completion of the delay time but waits for the next trigger pulse.

23. Check that a stable display can be obtained with the Delayed Triggering COUPLING switch set to AC and DC for both the (+) and (-) positions of the SLOPE switch (Delayed Triggering LEVEL control may be adjusted as necessary for a stable display).

24. Change the Delayed Triggering SOURCE switch to EXT. Connect a 0.4 volt, one-kilohertz signal from the oscilloscope calibrator to the DLY’D TRIG IN connector. Check that a stable dis play can be obtained with the Delayed Triggering COUPLING switch set to AC and DC, for both the (+) and (-) positions of the SLOPE switch (Delayed Triggering LEVEL control may be adjusted as necessary for a stable delayed sweep display).

High-Frequency Synchronization. Perform the following procedure to obtain a triggered alternate, normal, or delayed sweep with a 100 megahertz to 500 megahertz input signal:

NOTE To check HF sync operation, a signal source frequency between 100 megahertz and 500 megahertz is required. If a 100 to 500 megahertz signal source is not available, or if it is not desired to check the HF sync operation, the last two steps of this procedure may be deleted.

25. Change the MAIN TRIGGERING MODE

switch to HF SYNC. Connect a high-frequency signal source (100 to 500 megahertz) to the amplifier plug-in unit input and adjust for four divisions of vertical deflection. Adjust the TIME/DIV OR DLY TIME switch and DLY’DTime/Division switch for about six cycles of display. Rotate the MAIN TRIGGERING LEVEL control throughout its range and note that the sweep is alternately stable, then free-running, several times during the rotation (stable display indicates that the triggergenerator frequency is adjusted to a sub-har m onic of the trigger signal frequency). Check that stable dis plays can also be obtained with the MAIN TRIGGERING COUPLING switch set to AC, AC LF REJ, and DC (MAIN TRIGGERING LEVEL control may be adjusted, as necessary, for a stable display).

26. Pull out the DLY’D Time/Division switch and

rotate it to the next fastest sweep rate fr om the setting of the TIME/DIV OR DLY TIME switch (Alternate mode). When the LEVEL contr ol is in the detent (RUNS AFTER DELAY TIME) the display should be stable. Rotate the LEVEL control counterclockwise out of the detent and adjust for a stable display. Check that stable crt dis plays

can be obtained with the Delayed Triggering COUPLING switch set to AC and DC. Disconnect the high-frequency signal from the oscilloscope system.

GENERAL OPERATING INFORMATION MAIN TRIGGERING

The MAIN TRIGGERING MODE, COUPLING, and SOURCE pushbutton switches are arranged in a sequence which places the most-often used position at the top of each series of pushbuttons. With this arrangement, a stable display can usually be obtained by pressing the top pushbuttons: AUTO, AC, and INT. When an adequate trigger signal is applied and the LEVEL control is set correctly, the TRIG’D indicator will light. If the TRIG’D indicator is not lit: (1) the LEVEL control is at a setting outside the range of the trigger signal from the amplifier plug-in unit, ( 2) the tr igger s ignal is inadequate, or (3) the trigger-signal f requenc y is below the lower frequency limit of the COUPLING switch position. If the desired display is not obtained with these pushbuttons, other selections must be made. Refer to the following discussions or the instruction manuals for the oscilloscope and amplifier plug-in unit for more information.

Main Trigger Modes

The MODE pushbutton switch selects the mode in which the main sweep is triggered.

AUTO. The AUTO pushbutton provides a triggered display with the correct setting of the LEVEL control (see Trigger Level discussion) whenever an adequate trigger signal is applied. The TRIG’D indicator lights when the display is triggered.

When the trigger repetition rate is outside the frequency range selected by the COUPLING switch or the trigger signal is inadequate, the sweep free-runs at the sweep rate indicated by the TIME/DIV OR DLY TIME switch (TRIG’D indicator off). An adequate trigger signal ends the free-running condition and a triggered dis play is presented. When the LEVEL control is at a setting outside the amplitude range of the trigger signal, the sweep also free runs at the sweep rate indicated by the TIME/DIV OR DLY TIME switch. This type of freerunning display can be useful when it is desired to measure only the maximum peak -to-peak amplitude of a signal without observing the waveshape (such as in bandwidth measurements).

HF SYNC. The HF SYNC pushbutton permits stable displays of repetitive signals with only 0.5 division of internal trigger signal (100 millivolts external signal) required for frequencies between 100 megahertz and 500 megahertz.

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Operating Instructions—7B92A

A triggered display is obtained when the LEVEL control adjusts the frequency of the trigger gener ator to the frequency or sub-harmonic of the trigger signal. Stable displays may be obtained several times between the limits of the LEVEL control, depending on the amplitude and frequency of the trigger signal. The LEVEL control should be set for optimum display. (In the High-Frequency Synchronization mode, the display is not necessarily stable when the TRIG’D indicator is lit.)

When the LEVEL control is adjusted between subharmonics of the trigger signal frequency, the trigger repetition rate is below 100 megahertz or outside the frequency range selected by the COUPLING switch, or the trigger signal amplitude is inadequate, the sweep free-runs at the sweep rate determ ined by the TIME/DIV OR DLY TIME switch.

NORM. The NORM pushbutton provides a triggered display with the correct setting of the LEVEL control whenever an adequate trigger signal is applied. The TRIG’D indicator lights when the display is triggered.

The NORM trigger mode must be used to produce triggered displays with trigger repetition rates below about 30 hertz. When the TRIG’D indicator is off , no trace will be displayed.

SINGLE SWEEP. When the signal to be displayed is not repetitive or varies in amplitude, waveshape, or repetition rate, a conventional repetitive type display may produce an unstable presentation. A stable display can often be obtained under these circumstances by using the single-sweep feature of this unit. The Single Sweep mode is also useful to photograph non-repetitive or unstable displays.

To obtain a single-sweep display of a repetitive signal, first obtain the best possible display in the Norm mode. Then, without changing the other MAIN TRIGGERING controls, press the SINGLE SWEEPRESET pushbutton. A single trace is presented each time the pushbutton is pressed. Fur ther sweeps cannot be presented until the SINGLE SWEEP-RESET pushbutton is pressed again. If the displayed signal is a complex waveform composed of pulses of varying amplitude, successive single-sweep displays may not start at the same point on the waveform. To avoid confusion due to the crt persistenc e, allow the display to disappear before pressing the SINGLE SW EEP-RESET pushbutton again. At fast sweep rates, it may be difficult to view the single-sweep display. The apparent trace intensity can be increased by reducing the ambient light level or using a viewing hood as recommended in the oscilloscope instruction manual.

When using the Single Sweep mode to photograph waveforms, the graticule must be photographed separately in the normal manner to prevent over-exposing the film. Be sure the camera system is well protected against stray light, or operate the system in a darkened room. For repetitive waveforms, press the SINGLE SWEEP-RESET pushbutton only once for each waveform unless the signal is completely symmetrical. Otherwise, multiple waveforms may appear on the film . For random signals, the lens can be left open until the signal triggers the unit. Further information on photographic techniques is given in the appropriate camera instruction manual.

Main Trigger Coupling

The MAIN TRIGGERING COUPLING switches select the method in which the trigger signal is connected to the trigger circuits. Each position permits selection or rejection of som e frequency components of the trigger signal which trigger the sweep.

AC. The AC pushbutton blocks the dc component of the trigger signal. Signals with lowfrequency components below about 30 hertz are attenuated. In general, ac coupling can be used for most applications. However, if the signal contains unwanted frequency components, or if the sweep is to be triggered at a low repetition rate or dc level, one of the other COUPLING switch positions will provide a better display.

AC LF REJ. The AC LF REJ pushbutton rejects dc, and attenuates low-frequency trigger signals below about 30 kilohertz. Therefore, the sweep is triggered only by the higher-frequency components of the trigger signal. This position is particularly useful for providing stable triggering if the trigger signal contains linefrequency components. Also, the AC LF REJ position provides the best Alternate mode vertical dis plays at fas t sweep rates when comparing two or more unrelated signals.

AC HF REJ. The AC HF REJ pushbutton passes all low-frequency signals between about 30 hertz and 50 kilohertz. The dc component is rejected and signals outside the above range are attenuated. When triggering from complex waveforms, this position is useful to provide a stable display of the low-frequency components. AC HF REJ coupling should not be used when operating in the HF SYNC triggering mode.

DC. The DC pushbutton can be used to provide stable triggering from low-f requency signals which would be attenuated in the other modes. It can also be us ed to trigger the sweep when the trigger signal reaches a dc level set by the LEVEL control. When using internal triggering, the setting of the amplifier plug- in unit position control affects the triggering point.

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Operating Instructions-7B92A

Main Trigger Source

The MAIN TRIGGERING SOURCE pushbutton switches select the source of the trigger signal that is connected to the main trigger circuits.

INT. The INT pushbutton connects the trigger signal from the am plif ier plug-in unit. Fur ther s elec tion of the internal trigger signal may be provided by the amplifier plug-in unit or oscilloscope; s ee the instruction manuals for these ins trum ents f or m ore inf orm ation. For most applications, the internal source can be used. However, some applications require special triggering that cannot be obtained in the INT position. In such cases, the LINE or EXT positions of the SOURCE switches must be used.

LINE. The LINE pushbutton connects a sample of the power-line voltage from the oscilloscope to the trigger circuit. Line triggering is useful when the input signal is time-related (multiple or s ubmultiple) to the line frequency. It is also useful for providing a s table display of a line-frequency component in a complex waveform. Line triggering cannot be used when operating in the HF sync triggering mode.

EXT. The EXT pushbutton connects the signal from the MAIN TRIG IN connector to the trigger cir cuit. The external signal mus t be tim e-related to the displayed waveform for a stable display. An external trigger signal can be used to provide a triggered display when the internal signal is too low in amplitude for correct triggering, or contains signal components on which triggering is not desired. It is also useful when signal tracing in amplifiers, phas e-shift network s, wave-shaping circuits, etc. The signal from a single point in the circuit can be connected to the MAIN TRIG IN connector through a probe or cable. The sweep is then triggered by the same signal at all times and allows amplitude, time relationship, or waveshape changes of signals at various points in the circuit to be examined without resetting the MAIN TRIGGERING controls.

EXT Þ 10. The EXT Þ 10 pushbutton operates the same as described for EXT except that the external signal is attenuated. Attenuation of high-amplitude external trigger signals is desirable to increase the effective range of the LEVEL control.

Input Impedance

The input Impedance of the MAIN TRIG IN and DLY’D TRIG IN connectors may be selected by the frontpanel TERM switch.

FRONT-PANEL IN -- 1 MΩ. The 1 MΩ position is suitable for most low- and medium-frequency applications or when using a 10X probe. The 1 M position provides a high input impedance for minimum loading on the trigger signal source.

FRONT-PANEL OUT -- 50 Ω. The 50 Ω position is recommended for high-frequency applications requiring maximum overal bandwidth. The 50 ohm termination should be used when externally triggering from a 50 ohm system.

Trigger Slope

The MAIN TRIGGERING SLOPE control (concentric with the MAIN TRIGGERING LEVEL control) determines whether the trigger circuit responds on the positive-going or negative-going portion of the trigger signal. The trigger slope cannot be selected when operating in the high-frequency synchronization mode. When the SLOPE control is in the + (positive-going) position, the display starts on the positive-going portion of the waveform; in the - (negative-going) position, the display starts on the negative-going portion of the waveform (see Fig. 1-4). When several cycles of a signal appear in the display, the setting of the SLOPE control is often unimpor tant. However, if only a certain portion of a cycle is to be displayed, correct setting of the SLOPE control is important to provide a display which starts on the desired slope of the input signal.

Trigger Level

The MAIN TRIGGERING LEVEL control determines the voltage level on the trigger signal at which the sweep is triggered when operating in the Auto, Norm, or Single Sweep modes. When the LEVEL control is set in the + region, the trigger cir cuit responds at a more positive point on the trigger signal. W hen the LEVEL control is set in the - region, the trigger circuit responds at a more negative point on the trigger signal. Fig. 1-4 illustrates this effect with different settings of the SLOPE switch.

To set the LEVEL control, first s elect the MAIN TRIGGERING MODE, COUPLING, SOURCE, and SLOPE. Then set the LEVEL control fully counterclockwise and rotate it c lockwise until the display starts at the desired point. Less selection of the triggering level is available as the trigger signal frequency exceeds 150 megahertz.

When operating in the MAIN TRIGGERING HF sync mode, the LEVEL control synchronizes the trigger generator frequency to a sub-harmonic of the trigger signal frequency. Trigger slope and level cannot be selected.

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Operating Instructions—7B92A

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Fig. 1-4. Effect of MAIN TRIGGERING LEVEL and SLOPE controls on crt display.

1-11

Selecting Sweep Rates

The TIME/DIV OR DLY TIME switch selects calibrated sweep rates for the delaying sweep. The DLY’D Time/Division switch selects calibrated sweep rates for the delayed sweep. The sweep rate for the delaying sweep is bracketed by the black lines on the clear plastic flange of the TIM E/DIV OR DLY TIME switch. Sweep rate of the delayed sweep is indicated by the white line on the DLY’D Time/Division knob. W hen the white line on the outer knob is set to the same position as the lines on the inner knob, the two knobs lock together and the sweep rate of both generators is changed at the same time. However, when the DLY’D Time/Division knob is pulled outward, the clear plastic flange is disengaged and only the delayed sweep rate is changed. This allows changing the delayed sweep rate without changing the delaying sweep rate. The TIME/DIV OR DLY TIME switch and the DLY’D Time/Division switch also select display modes. See Display Mode discussion in this section for further information.

A VARIABLE control is provided concentric with the TIME/DIV OR DLY TIME and DLY’D Time/Division switches (see Fig. 1-3). This control can be used with either the delaying or delayed sweeps as determined by the Time/Div Variable Selector multi-pin connector (internal, see Fig. 1-1 for location). The VARIABLE control also incorporates a two-position switch to determine if the applicable sweep is calibrated or uncalibrated. W hen the VARIABLE c ontr ol is pres s ed in, it is inoperative. However, when pressed and released, the VARIABLE control is activated for uncalibrated sweep rates. The sweep rate can be returned to the calibrated position by pressing the VARIABLE knob in. This feature is useful when a spec if ic unc alibrated s weep rate has been obtained and it is desired to switch between calibrated and uncalibrated sweep rates. Switching from uncalibrated to calibrated and vice-versa does not affect the setting of the VARIABLE control. The VARIABLE control allows the sweep rate in each Time/Division switch pos ition to be increased to at least the next adjacent switch position.

Time Measurement

When making time measurements from the graticule, the area between the second and tenth vertic al lines of the graticule provides the most linear time measurements (see Fig. 1-5). Position the start of the timing area to the second vertical line and adjust the TIME/DIV OR DLY TIME switch so the end of the timing area falls between the fourth and tenth vertical lines.

Display Modes

Four display modes can be selected by appropriate settings of the TIME/DIV OR DLY TIME and DLY’D Time/Division switches.

Operating Instructions-7B92A

Fig. 1-5. Area of graticule used for most accurate time

measurements.

Normal Sweep Operation. To select the Normal sweep display mode, press in the DLY’D Time/Division switch and set it to the same sweep rate as the TIME/DIV OR DLY TIME switch. Rotate the Delayed Triggering LEVEL control clockwise into the detent to the RUNS AFTER DELAY TIME position.

Calibrated sweep rates in the Normal sweep display mode are 0.2 s/Div to 0.5 ns/Div. By using the VARIABLE control (Time/Div Variable Selector connec tor set for variable Delayed Sweep rates) uncalibrated sweep rates to 0.5 s/Div are available. Triggering in the Normal sweep display mode is controlled by the MAIN TRIGGERING controls.

Alternate Sweep Display. To select the Alternate display mode, pull out the DLY’D Time/Division knob and rotate it to a desired sweep rate faster than the TIME/DIV OR DLY TIME switch setting. In this mode, both an intensified sweep and a delayed sweep are displayed (see Fig. 1-6).

The intensified trace of the Alternate sweep display provides an intensified portion on the delaying sweep during the time the delayed sweep is running. The amount of delay time between the start of the delaying sweep and the intensified portion is determined by the TIME/DIV OR DLY TIME switch and the DELAY TIME MULT dial. Triggering for the delaying sweep portion of the intensified trace is controlled by the MAIN TRIGGERING controls; triggering for the intensified portion of the delayed sweep trace is controlled by the Delayed Triggering controls.

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Fig. 1-6. Typical alternate sweep display.

The TRACE SEP control vert ically positions the intensified trace up to 3.5 divisions above the delayed sweep trace. The brightness of the intens ified zone may be varied by the CONTRAST adjustment. The brightness of the intensified sweep m ay be varied by the 7B92A INTENSITY control.

Intensified Sweep Mode. The Intensified sweep mode is selected when the DLY’D Time/Division switch is pulled out, rotated to the desired sweep rate faster than the TIME/DIV OR DLY TIME switch setting, and the TRACE SEP control is rotated counterclock wise to the ALT OFF position.

Delayed Sweep Display. The Delayed sweep display mode is selected when the DLY’D Time/Division switch is pulled out, rotated to the desired sweep rate, and then pushed in. In this mode, only the delayed sweep is displayed.

Calibrated sweep rates in the Delayed sweep mode are available from 0.2 s/Div to 0.5 ns/Div. By using the VARIABLE control (Tim e/Div Variable Selector connector set for variable delayed sweep rates), uncalibrated delayed sweep rates to 0.5 s/Div are available. Triggering for the delayed sweep is controlled by the Delayed Triggering controls.

Operating Instructions—7B92A

Delay Time Multiplier

The DELAY TIME MULT dial (functional in the Delayed, Intensified, Alternate, or Mainframe Delaying modes) provides 0 to 9.8 tim es c ontinuous sweep delay. The amount of tim e that the delaying sweep runs before the start of the delayed sweep is determined by the settings of the TIME/DIV OR DLY TIME switch and the DELAY TIME MULT dial.

For example, a DELAY TIME MULT dial setting of 3.55 corresponds to 3.55 crt divisions of delaying sweep. Thus, 3.55 multiplied by the delaying sweep rate, indicated by the TIME/DIV OR DLY TIME switch, gives the calibrated delay time before the start of the delayed sweep.

Delayed Sweep Triggering

The Delayed Triggering LEVEL control determines the delayed triggering mode, and delayed triggering level. W hen the LEVEL control is in the RUNS AFTER DLY TIME detent position (fully clockwise), the delayed sweep starts immediately after the delay time (determined by the TIME/DIV OR DLY TIME switch and DELAY TIME MULT dial). This m ode permits selection of continuously variable delay times by rotating the DELAY TIME MULT dial. The Delayed Triggering LEVEL control and SLOPE, COUPLING, and SOURCE switches are inoperative.

When the delayed sweep is triggerable (Delayed Triggering LEVEL out of the RUNS AFTER DELAY detent), the delayed sweep does not start at the completion of the delay time. Instead, it waits until a trigger pulse is received by the Delayed Triggering circuits. The delay time in this mode is dependent not only on the settings of the delay time controls, but on the Delayed Triggering controls and the occurrence of the delayed-sweep triggering signal as well. The primary purpose of this mode is to eliminate jitter from the delayed sweep is triggered by the input waveform, jitter is eliminated from the delayed sweep display even though it may be inherent in the input waveform. When jitter in the delayed sweep display is not a problem, the Runs After Dly Time mode should be used.

In the Delayed Sweep Triggerable mode, the Delayed Triggering LEVEL control is rotated to select the amplitude point on the trigger signal at which the delayed sweep is triggered. The Slope, Coupling, and Source functions are the same for delayed triggering as for MAIN TRIGGERING (see MAIN TRIGGERING SLOPE, COUPLING, SOURCE, and TERM switch discussions in this section).

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Section 2-7B92A

SPECIFICATION

This instrument will meet the electrical characteristics listed under Performance Requirement in Table 2-1,

following complete calibration. The following electrical characteristics apply over an ambient temperature range of 0° C to +50° C, except as otherwise indicated. Warm-up time for given accuracy is 20 minutes.

Table 2-1.

ELECTRICAL CHARACTERISTICS

Characteristic Performance Requirement Supplemental Information

MAIN TRIGGERING Trigger Sensitivity Triggering Frequency Minimum Triggering

Range Signal Required

Operating in AUTO, NORM, or INT

EXT

SINGLE SWEEP MODE (div) (mV) COUPLING AC 30 Hz to 20 MHz 0.5 100

20 MHz to 500 MHz 1.0 500 30 kHz to 20 MHz 0.5 100

AC LF REJ

’

20 MHz to 500 MHz 1.0 500 AC HF REJ 30 Hz to 50 kHz 0.5 100 DC Dc to 20 MHz 0.5 100

20 MHz to 500 MHz 1.0 500 Operating in HF SYNC MODE AC 100 MHz to 500 MHz 0.5 100 Use NORM or SINGLE

AC LF REJ SWEEP MODE for signals DC below about 30 Hz AC HF REJ Not recommended for HF

SYNC MODE

External Trigger Input

Level Range EXT At least + and - 3.5 volts Not applicable in HF SYNC

MAIN TRIGGERING

EXT Þ 10 At least + and -35 volts MODE

Maximum Safe Input

1 MΩ Input 250 V (dc + peak ac) 50 Ω Input 1 W average (7 V rms)

Input R and C

1 MΩ Input Approximately 1 MΩ

paralleled by approximately 20 pF

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Specification--7B92A

Table 2-1 (cont)

Characteristic Performance Requirement Supplemental Information

50 Ω Input

Resistance 50 Ω within 7% Reflection Coefficient (Time 0.1 p-p (using 1 GHz ReDomain) flectometer)

Trigger Jitter

Internal or External 50 ps or less at 500 MHz

Delayed Triggering Trigger Sensitivity Triggering Frequency Minimum Triggering

Range Signal Required

INT

EXT

(div) (mV)

COUPLING

AC 30 Hz to 20 MHz 0.5 100

20 MHz to 500 MHz 1.0 500 DC Dc to 20 MHz 0.5 100

20 MHz to 500 MHz 1.0 500

Trigger Jitter

Internal or External 50 ps or less at 500 MHz

External Trigger Input

Level Range

EXT At least +3.5 V to -3.5 V

Maximum Safe Input

1 MΩ Input 250 V (dc + peak ac) 50 Ω Input 1 W average (7 V rms)

Input R and C

1 MΩ Input Approximately 1 M

paralleled by approximately 20 pF

Ω

50 Ω Input

Resistance 50 Ω within 7% Reflection Coefficient 0.1 p-p (using 1 GHz (Time Domain) Reflectometer)

Normal, Alternate (Delayed Sweep Trace) and Delayed Sweep Sweep Rates 0.2 s/div to 0.5 ns/div in 27 calibrated steps Selected by TIME/DIV

OR DELAY TIME switch. Steps in a 1-2-5 sequence

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Speclfication-7B92A

Table 2-1 (cont)

Characteristic Performance Requirement Supplemental Information

Sweep Accuracy Measured in 7900-Series Oscilloscope

Over Center 8 Div +15°C to +35°C 0°C to +50°C

.2 s/Div to 20 ns/Div Within 2% Within 3% 10 ns/Div to 5 ns/Div Within 3% Within 4% 2 ns/Div to 1 ns/Div Within 4% Within 5%

.5 ns/Div Within 5% Within 6% Over Any 2 Div Portion Within Center 8 Div

.2 s/Div to 10 ns/Div Within 5% Within 5%

5 ns/Div to .5 ns/Div Within 10% Within 10%

Variable Sweep Rate Continuously variable between calibrated Extends sweep rate to

sweep rates at least 0.5 s. VARIA-

BLE control internally switchable between Delaying and Delayed Sweeps. Variable range at least 2.5:1

Intensified Sweep (Delaying Selected by TIME/DIV Sweep Trace of Alternate OR DLY TIME switch. Display) Steps in a 1-2-5 sequence Sweep Rates 0.2 s/div to 10 ns/div in 23 calibrated steps

Sweep Accuracy Measured in 7900-Series Oscilloscope

Over Center 8 Div +15°C to +35°C 0°C to +50°C .2 s/Div to 20 ns/Div Within 2% Within 3% 10 ns/Div Within 3% Within 4% Over Any 2 Div Portion Within Within 5% Within 5% 8 Div

Variable Sweep Rate Continuously variable between calibrated sweep Extends sweep rate to at

rates least 0.5 s. Variable con-

trol internally switchable between Delaying and Delayed Sweeps

Trace Separation Intensified sweep can be positioned at least 3.5

div above the delayed sweep

ALT OFF Intensified sweep of the delaying sweep is dis- Allow Intensified mode of

played when the TIME/DIV OR DELAY TIME switch operation is pulled out and rotated clockwise, and the TRACE SEP control is in ALT OFF position

Variable Time Delay Delay Time Range

DLY TIME/DIV Settings

.2 s/Div to 10 ns/Div 0 to 9.8 times the DLY TIME switch setting (0

to 1.96 s)

REV B, JUN 1978

2-3

Specification-7B92A

Table 2-1 (cont)

Characteristic Performance Requirement Supplemental Information

Differential Delay Time Measurement Accuracy

+15°C to +35°C .2 s/Div to .1 µs/Div

Both DELAY TIME MULT Within 0.75% of measurement +0.25% of full Full scale is 10 times the

dial settings at 0.50 or scale TIME/DIV OR DLY TIME

greater setting

One or both DELAY TIME Within 0.75% of measurement +0.5% of full scale

MULT dial settings less than +5 ns

0.50

50 ns/Div to 10 ns/Div

Both delay times equal to or Within 1.0% of measurement +0.5% of full scale

greater than 25 ns

One or both delay times less Within 1.0% of measurement +1.0% of full scale

than 25 ns +5 ns

Delay Time Jitter Jitter specification does not

apply to the first 2% of the maximum available delay time (DELAY TIME MULT dial setting less than 0.20)

0.2 s/Div to 50 µs/Div 1 part or less in 50,000 of the maximum available

delay time (10 times the TIME/DIV OR DLY TIME switch setting)

20 µs/Div to 10 ns/Div 1 part or less in 50,000 of the maximum available

delay time (10 times the TIME/DIV OR DLY TIME switch setting +0.5 ns)

Will not trigger on the sine waves of 8 div amplitude or less ( internal), or 3 V or less (external) at

60 Hz or below.

For Internal Triggering only, the specified -3 dB frequency of the Vertical System replaces any frequencies in the above table when the number in the table is greater than the -3 dB frequency of the Vertical System.

Triggering signal amplitude requirements increased by factor of 10 for EXT - 10 operation.

The specified -3 dB frequency of the Vertical System replaces any frequencies in the above table when the number in the table is greater than the -3 dB frequency of the Vertical System.

Table 2-2. Table 2-3.

ENVIRONMENTAL PHYSICAL

Refer to the Specification for the associated oscilloscope. Net Weight 3.062 lbs (1.372 kg)

Dimensions See Fig. 2-1, Dimensional Drawing

2-4

REV A, JUN 1978

Specification—7B92A

REV C, JUN 1978

Fig. 2-1. Dimensional drawing.

2-5

WARNING

THEORY OF OPERATION

Section 3-7B92A

This section of the m anual contains a description of the circuitry used in the 7B92A. The description begins with a discussion of the instrument using the block diagram in the Diagrams section. Each c ircuit is then described in detail with a block diagram provided to show the major interconnections between circuits, and the relationship of the front-panel controls to each circuit.

BLOCK DIAGRAM DESCRIPTION

The Main Trigger Generator ensures a stable crt

display by starting each sweep at the same point on the waveform. The output of the Main Trigger Generator is a fast-rise pulse which starts the Delaying Sweep Generator.

The Delaying Sweep Generator produces a

linear voltage ramp. This ramp is displayed when the time base is in the Intensified or Alternate mode. The Delaying Sweep ramp is also used as a delay-time reference when the time base is in the Alternate or Delayed mode. The delay time is set by the slope of the Delaying Sweep ramp and the Delay Pick off com parator voltage. When the time base is in the Normal Sweep mode, the comparator voltage is set to 0 (zero) and the Delay Pick off outputs a pulse when the Delaying Sweep ramp starts.

The Delayed Trigger Generator produces a fast-

rise pulse to start the Delayed Sweep Generator. When the Delayed Trigger Generator is in the Runs Af ter Delay Time mode, the puls e from the Delay Pick off produces the Delayed Trigger output pulse. When the Delayed Trigger Generator is in the Tr iggerable After Delay Time mode, the pulse from the Delay Pick off enables the Delayed Trigger Generator, which then processes the input signal in the same way as the Main Trigger Generator.

The Delayed Sweep Generator produces a linear

voltage ramp that is displayed as either the Normal or Delayed sweep.

The Output Amplifier horizontally positions the crt display and couples the proper sweep ramp(s) to the oscilloscope.

DETAILED CIRCUIT DESCRIPTION

Main Trigger Generator

The Main Trigger Gener ator provides a stable display by starting the Delaying Sweep Generator at a selected point on the input waveform. The triggering point can be varied by the LEVEL control and may be on either the positive or negative slope of the waveform. The input signal may be the waveform being displayed (INT), a waveform from an exter nal sourc e (EXT or EX T ’10), or a sample of the power-line voltage (LINE).

The bandwidth of the Main Trigger Generator is set by the COUPLING switches. Dc coupling provides a bandwidth of dc to 500 megahertz. Ac coupling blocks dc and frequencies below about 30 hertz. AC LF REJ (ac coupling, low-frequency rejection) passes frequencies above 30 kilohertz. AC HF REJ (ac coupling, high-frequency rejection) passes frequencies between 30 hertz and 30 kilohertz.

External Source (SN B070000-above). The external trigger signal is connected to the Main Trigger Generator through the MAIN TRIG IN connector, J100. The input impedance at J100 can be set to either 1 megohm or 50 ohms by TERM switch S205.

If the SOURCE switch is set to EXT, relay K6 energizes and applies the trigger signal to C11 and R11. Signals below 30 kilohertz are connected to the gate of Q22A through R14, C12, R12, and R11. Signals between 30 kilohertz and 100 megahertz are connected to the gate of Q22A through R17 and C11. These signals pass through Q22A and Q24 to pin 3 of U74. Signals above 100 megahertz are connected to pin 4 of U74 through C20. (Pins 3 and 4 of U74 are internally connected.)

The Horizontal Logic controls the Main Trigger Generator, the Delayed Trigger Generator, and the Output Amplifier. The Horizontal Logic produces a Trigger Disable pulse which resets the trigger generator s and allows the sweep generators to reset and stabilize before starting another ram p. The Horizontal Logic also controls which sweep ramp is pass ed thr ough the O utput Amplifier to be displayed.

If the SOURCE switch is set to EXT . 10, relay K6 de-energizes and applies the input signal to C10 and R9. The signal is then divided by 10 before being applied to the gate of Q22A.

3-1

Theory of Operation-7B92A

External Source (SN B069999-below). The external

trigger signal is connected to the Main Trigger Generator through the MAIN TRIG IN connector, J100. The input impedance at J100 can be set to either 1 megohm or 50 ohms by TERM switch S205.

If the SOURCE switch is set to EXT, relay K6 energizes and applies the trigger signal to C11 and R11. Signals below 30 kilohertz are connected to the gate of Q22A through R14, C12, R12, and R11. Signals between 30 kilohertz and 100 megahertz are connected to the gate of Q22A through R17 and C11. These signals pass through Q22A and 024 to pin 3 of U64. Signals above 100 megahertz are connected to pin 4 of U64 through C20. (Pins 3 and 4 of U64 are internally connected.) .

f the SOURCE switch is set to EXT ’ 10, relay K6 deenergizes and applies the input signal to C10 and R9. The signal is then divided by 10 before being applied to the gate of Q22A.

Internal Source (SN B070000-above). The internal trigger signal from the vertical channel of the oscilloscope is connected to the Main T rigger Generator through J150. Signals below 30 kilohertz are amplified by U44B and connected, along with the offset from the LEVEL control, to pin 1 of U74 and to the base of Q86. Signals above 30 kilohertz are coupled through C46 to pin 14 of U74. (Pins 13 and 14 of U74 are internally connected.)

Internal Source (SN B069999-below). The internal trigger signal from the vertical channel of the oscilloscope is connected to the Main T rigger Generator through J150. Signals below 30 kilohertz are amplified by U128B and connected, along with the offset from the LEVEL control, to pin 1 of U64 and to the base of 072. Signals above 30 kilohertz are coupled through C46 to pin 14 of U64. (Pins 13 and 14 of U64 are internally connected.)

Internal-External Amplifier (SN B070000above). Amplifier U74 is a dual-channel, differential

amplifier with a common reference voltage for both channels. The input channel to be amplif ied is selected by the bias on pins 2 and 15. When R77 is connected to

-15 volts, the internal trigger signal (pins 13 and 14) is amplified. When R79 is connected to -15 volts, the external trigger signal (pins 3 and 4) is amplified. The push-pull outputs (pins 8 and 9) are connected to the inputs (pins 5 and 8) of U122. When AC H F REJ coupling is selected, R77 and R79 are both disconnected from -15 volts, disabling U74. The low-frequency signals (below 30 kilohertz) are then connected to U122 through Q86 (internal signals) or 082 (external or line signals).

Internal-External Amplifier (SN B069999-

below). Amplifier U64 is a dual-channel, differential

amplifier with a common reference voltage for both channels. The input channel to be amplif ied is selected by the bias on pins 2 and 15. When R66 is connected to

-15 volts, the internal trigger signal (pins 13 and 14) is amplified. When R67 is connected to -15 volts, the external trigger signal (pins 3 and 4) is amplified. The push-pull outputs (pins 8 and 9) are connected to the inputs (pins 3 and 14) of U84.

When AC HF REJ coupling is selec ted, R66 and R67 are both disconnected from - 15 volts, disabling U64. The low-frequency signals (below 30 kilohertz) are then connected to U84 through Q72 (internal signals) or Q74 (external or line signals).

Slope Selector and Trigger Generator (SN B070000above). U122 selects the slope of the input

waveform on which triggering occ ur s . If pin 3 is high, the time base will trigger on the negative slope of an inter nal signal or the positive slope of an external signal. If pin 3 is low, the time base will trigger on the positive slope of an internal signal or the negative slope of an external signal. (The internal signal is inverted by U74 or Q86 before being applied to U122.)

The delay mode control signal into U122, pin 4 is functional only when the unit is operating as a delayed sweep unit in the B horizontal compartment of a mainfram e with two horizontal compartments . When the unit is operating in the Independent or Triggerable After Delay Time modes (as determined by the delaying sweep time-base unit in the A horizontal com partment), there is no affect on the Trigger Generator circuits. However, when the unit is operating in the B Starts Af ter Delay Time mode, a HI level at U122, pin 4 causes the trigger IC to generate a gate pulse at pin 15 when the trigger disable input goes low.

Slope Selector Amplifier (SN B069999-below).

Amplifier U84 select s the slope of the input wavef orm on which triggering occurs. If pin 6 is high, the time base will trigger on the positive slope of an inter nal signal or the negative slope of an external signal. If pin 6 is low, the time base will trigger on the negative slope of an internal signal or the positive slope of an external signal. (The internal signal is inverted by U64 or Q72 before being applied to U84.)

The push-pull outputs (pins 7, 8 and 9, 10) of U84 are connected to the inputs (pins 3 and 13) of U104.

Output Amplifier (SN B069999-below).

Amplifier U104 provides a final gain stage befor e driving the trigger-output tunnel diodes. The push-pull output of U104 (pins8 REV B, JUN 1978

3-2

Theory of Operation-7B92A

and 9) drives the emitter and base of Q0112. Transis tor Q112 converts the push-pull output of U104 to a singleended output to drive tunnel diode CR114. As the emitter-base voltage of Q112 increases, the current through CR114 increases. When the current through CR114 reaches 10 milliamperes, it switches to its high level. The fast rise-time of CR114 is coupled through C141 to the Arming Tunnel Diode, CR172, which also switches high. The high level at the anode of CR172 increases the current through the Gate Tunnel Diode, CR176. The rise-time of CR114 is also coupled thr ough C124 (and a 1 nanosecond delay line) to CR176. The combination of the added current from CR172 and the pulse from CR114 (1 nanosec ond later) s witches CR176 high. The fast-rise pulse from CR176 is connected to the Sweep Start Comparator of the Delaying Sweep Generator.

Trigger Disable (SN B070000-above). At the end of each sweep, the Logic circuits supply a Trigger Disable pulse to U122, pin 2. A HI level disables the trigger generator to allow enough time for the sweep generator to stabilize before another trigger pulse s tarts the next sweep.

Trigger Disable (SN B069999-below). At the end of each sweep, the Horizontal Logic produces a Trigger Disable pulse to reset the Arming and Gate Tunnel Diodes to a low level and allow enough tim e for the sweep generator to reset and stabilize before another trigger pulse starts the next sweep. T he Trigger Disable signal is connected to the base of 0151 through interconnecting pin CA. W hen the Trigger Dis able pulse is high, 0148 and Q158 turn on, removing the bias current from CR172 and CR176, respectively. The rest of the trigger generator operates normally, but CR172 and CR176 will not switch to a high level.

High-Frequency Synchronization (SN B070000above). The HF sync mode increases the

sensitivity of the trigger generator and is useful at frequencies above 10 megahertz. In the HF sync mode, the trigger generator (U122) is caused to free run by reducing the hysteresis to zero (pin 9). The LEVEL control, R50, adjusts the hysteresis around zero, varying the oscillating frequency and enabling U122 to synchronize with the input signal or a sub-harmonic of the input signal.

The inputs to U122 pins 5 and 8 are forced to be balanced by negative feedback loop U132B, U44A, and U74. This enables the HF sync circuit to function regardless of the dc level of the input signal. U44 is used to select phase of feedback required f or the input channel selected.

High-Frequency Synchronization (SN B069999below). The H F sync mode increases the sensitivity of the trigger generator at frequencies above 100 megahertz. In the HF sync mode, the trigger generator free runs at a frequency determined by the LEVEL control, R50. The LEVEL control adjusts the free-r unning frequency of the trigger generator to be close enough to the signal frequency, or sub-harmonic, to synchronize with it.

The positive feedback loop required to maintain oscillation is through Q104 to input pin 4 of U104, through Q0112 to CR114, and back to Q104. A negative feedback loop is also present to maintain synchronization of the oscillator with the trigger signal. The negative feedback loop is through U128Ato input pin 1 of U64, through U84, U104, and Q0112 to CR114, and back to U128A.

Delaying Sweep Generator

The Delaying Sweep Generator produces a linear ramp waveform when gated by the Main Trigger Generator. The Delaying Sweep ramp is displayed as the intensif ied sweep of the Alternate display. The Delaying Sweep ramp is also the time reference for the Delay Pick off comparator.

The linear ramp waveform is produced by charging a capacitor from a constant current source. The slope of the ramp determ ines the time/division of the displayed trace and the delay time set by the DELAY TIME MULT dial.

Ramp Generator. When a trigger pulse is received from the Main Trigger Generator , Q402 cuts off and Q404 conducts, driving the base of 0410 high. When Q410 turns on, Q412 turns off and the timing current from 0436 starts to charge the tim ing capacitors in a positive ramp. The tim ing current is determined by the timing resistors in the em itter circuit of Q436 and the reference voltage at the base of Q436. The reference is set by the SWP CAL adjustment, R750. Integrated circuit U752 is a unity-gain voltage follower. Diode CR753 compensates for the base- emitter voltage drop of Q436, Q494, and Q536. Transistor s Q446A and B and 0450 form a unity-gain voltage-follower for the delaying sweep signal. The output of Q450 is attenuated by divider R468, R469, and R458 before it is connected to the Output Amplifier. T he output of Q450 also dr ives the Sweep Stop Comparator, the Baseline Stabilizer, and the Delay Pick off.

Sweep Stop Comparator. Transistors Q462 and 0464 control the sweep length. W hen the Delaying Sweep ramp exceeds the voltage on the base of 0464, Q462 turns off and Q464 provides a positive pulse to end the Auxiliary Gate and produce the Hold-off Start pulse.

3-3

Theory of operation-7B92A

Auxiliary Gate Generator. When the trigger

pulse cuts off Q402, the negative pulse at the base of Q472 causes the Auxiliary Gate at the emitter of 0474 to go high. The Auxiliary Gate signal remains high until a positive pulse from the Sweep Stop Comparator turns Q468 on, ending the Auxiliary Gate. The positive pulse from the Sweep Stop Comparator is also coupled through CR811 to the base of 0812 and results in a positive Hold-off Start pulse at the collector of Q816. The Hold-off Start pulse is connected to the Horizontal Logic which starts the Trigger Disable pulse.

Baseline Stabilizer. W hen the Trigger Disable pulse resets the output of the Main Trigger Generator to a low level, Q402 turns on and Q404 turns off. T he low level on the base of 0410 turns on Q412, which discharges the timing capacitors. With the timing capacitors discharged, the Bas eline Stabilizer maintains a constant level from which the ramp begins. The output of Q450 is compared with the reference on the base of Q420A. If the output is less than the reference, Q430 charges the timing capacitors through CR434 until the output and reference voltages are equal. If the output is greater than the reference, Q430 conduc ts less and the timing capacitors discharge through Q412. When the two voltages are equal, the currents through Q430 and Q436 equal the current through Q412, holding the voltage on the timing capacitors constant.

Delay Pick off. The Delay Pick off allows a continuously variable delay of 0 to 9.8 times the TIME/DIV OR DLY TIME control setting between the start of the Delaying Sweep Generator and the start of the Delayed Sweep Generator. The Delay Pick off uses the Delaying Sweep ramp as a time reference by comparing the ramp voltage to a voltage set by the DELAY TIME MULT. When the ram p voltage exceeds the DELAY TIME MULT voltage, a pulse is coupled to the Delayed Trigger Generator.

When a trigger pulse is received from the Main Trigger Generator, Q493 cuts off and Q492 conducts.

As the Delaying Sweep ramp exceeds the voltage on the base of Q482B, Q482A cuts off and Q482B conducts. The differential signal produced when both Q492 and Q482B conduct is coupled to the Delayed Trigger Generator.

Transistor Q494 is a constant current source maintaining a constant voltage across DELAY TIME MULT, R490. When the time bas e is set for a Normal sweep mode, S490 grounds R499 and cuts off Q494. With Q494 cut off, the voltage at the input (pin 3) of voltage follower U492 is zero. Therefore, in the Normal sweep mode, the Delay Pick off outputs a pulse as s oon as the Main Trigger pulse cuts off Q493

Delayed Trigger Generator

When the Delayed Triggering LEVEL control is in the RUNS AFTER DELAY TIME position, or the time base is in the Normal Sweep mode, the Delayed Trigger Generator outputs a trigger pulse to the Delayed Sweep Generator as soon as the Delay Pick off pulse is received. If the Delayed Triggering LEVEL contro l is out of the RUNS AFTER DELAY TIME detent, and the time base is in the Delayed or Alternate sweep modes, the Delayed Trigger Generator is enabled by the Delay Pick off pulse. The Delayed Trigger Gener ator then operates much the same as the Main Trigger Generator.

External Source (SN B070000-above). The external trigger signal is connected to the Delayed Trigger Generator through the DLY’D TRIG IN connector, J200. The input impedance at J200 can be set to either 1 megohm or 50 ohms by TERM switch S205.

Input signals below 100 megahertz are coupled through Q222A and Q224 to pin 3 of U274. Input signals above 100 megahertz are coupled through C220 to pin 4 of U274. (Pins 3 and 4 of U274 are internally connected.)

External Source (SN B069999-below). The external trigger signal is connected to the Delayed Trigger Generator through the DLY’D TRIG IN connector, J200. The input impedance at J200 can be set to either 1 megohm or 50 ohms by TERM switch S205.

Input signals below 100 megahertz are coupled through Q222A and Q224 to pin 3 of U264. Input signals above 100 megahertz are coupled through C226 to pin 4 of U264. (Pins 3 and 4 of U264 are internally connected.)

Internal Source (SN B070000-above). When the Delayed Trigger Generator is using an internal trigger signal, the internal trigger signal from the vertical channel of the oscilloscope is connected to the Delayed Trigger Generator through J250. Signals above 30 k ilohertz are coupled through C246 to pin 14of U274. (Pins 13 and 14of U274 are internally connected.) Signals below 30 kilohertz are connected to amplif ier U244 through R257. The output of amplif ier U244 is coupled, along with the offset from the LEVEL control, to pin 1 of U274.

Internal Source (SN B069999-below). When the Delayed Trigger Generator is using an internal trigger signal, the internal trigger signal from the vertical channel of the oscilloscope is connected to the Delayed Trigger Generator through J250. Signals above 30 k ilohertz are coupled through C246 to pin 14 of U264. (Pins 13 and 14 of U264 are internally connected.) Signals below 30 kilohertz are connected to amplif ier U240through R253. The output of amplif ier U240 is coupled, along with the offset from the LEVEL control, to pin 1 of U264.

3-4

REV B, JUN 1978

Theory of Operation-7B92A

Slope Selector Amplifier (SN B070000-

above). Amplifier U322 selects the slope of the input

waveform on which triggering occ ur s . If pin 3 is high, the time base will trigger on the negative slope. If pin 3 is low, the time base will trigger on the positive slope. (The internal signal is inverted by U274 before being applied to U322.)

Slope Selector Amplifier (SN B069999-below). Amplifier U284 selects the slope of the input waveform on which triggering occurs. If pin 6 is high, the time base will trigger on the negative slope. If pin 6 is low, the tim e base will trigger on the positive slope. (The internal signal is inverted by U264 before being applied to U284.)

The push-pull outputs (pins 7, 8 and 9, 10) of U284 are connected to the inputs (pins 3 and 13) of U304.

Output Amplifier (SN B069999-below).

Amplifier U304 provides a final gain stage befor e driving the trigger output tunnel diodes. The push-pull outputs of U304 (pins 8 and 9) drive the emitter and base of Q312. Transistor Q312 c onverts the push-pull output of U304 to a single ended output to drive tunnel diode CR314. As the emitter base voltage of Q312 increases, the current through CR314 increases. W hen the current through CR314 reaches 10 milliamperes, it switches to its high level. The fast rise of CR314 is coupled through C341 to the Arming Tunnel Diode, CR372, which also switches high. The high level at the anode of CR372 increases the current through the Gate Tunnel Diode, CR376. The rise of CR314 is also coupled through C324 (and a 1 nanosecond delay line) to CR376. The combination of the added current from CR372 and the pulse from CR314 (1 nanosec ond later) s witches CR376 high. The fast-rise pulse from CR376 is connected to the Delayed Sweep Generator.

Trigger Disable (SN B070000-above). At the end of each Delaying Sweep, the Horizontal Logic produces a Trigger Disable pulse to allow enough time for the sweep generator to reset and stabilize before another trigger pulse starts the next sweep. The Trigger Disable pulse resets the main trigger output to a low level. At the same time U820 pulls pin 3 AUTO high. With pin CF low, and pin AH high (see Delaying Sweep <> ),comparatorsQ402Q404, Q492-Q493 and Q482AQ482B reset to Q404, Q0492, and Q482B off and Q402, Q493, and Q482A conducting. This resets the differential comparators Q362, Q366 and Q342, Q346 to Q362, Q342 off and Q366, Q346 on. W ith Q342 off , pin 2 of U322 is high resetting the Delayed Trigger.

Trigger Disable (SN B069999-below). At the end of each Delaying Sweep, the Horizontal Logic produces a Trigger Disable pulse to reset the Arming and Gate Tunnel Diodes to a low level and allow enough

time for the sweep generator to reset and stabilize before another trigger Theory of Operation-7B92A pulse starts the next sweep. The Trigger Disable signal is connec ted to the base of Q332. When the T rigger Disable pulse is high, 0348 and 0358 turn on, removing the bias cur rent from CR372 and CR376, respectively. With no bias current, CR372 and CR376 both reset to a low level.

Delayed Triggering Modes (SN B070000-

above). The Delayed Trigger Generator operates in one

of three modes; Normal, Delayed (Runs After Delay Time), and Delayed (Triggerable After Delay Time).

In the Normal mode (both Time/Division knobs locked together), Q328 is cut off and U322 inputs are disabled. When the Delay Pick off pulse goes high, U322 gate goes high.

In the Delayed (Runs After Delay Time) mode, the Delayed Trigger Generator operates the sam e as in the Normal mode. However, Q328 is cut off by the RUNS AFTER DELAY TIME switch, S250; but, there is a delay between the time the Delaying Sweep Generator starts and the Delay Pick off is generated. The Delay Pick off pulse c aus es the gate of U322 to go high. In the Delayed (Triggerable After Delay Time) mode, U322 is in the Triggerable mode. Now the Delay Pick off pulse enables U322 to trigger when a trigger input signal is present.

Delayed Triggering Modes (SN B069999below). The Delayed Trigger Generator operates in one

of three modes; Normal, Delayed (Runs After Delay Time), and Delayed (Triggerable After Delay Time).

In the Normal mode (both Time/Division knobs locked together), Q334 is cut of f and U284 and U304 are both disabled. Additional current for CR372 and CR376 is supplied by R335 and R337. When the Delay Pick off pulse cuts off CR381, CR372 switches high. The fast rise of CR382 is coupled through R373 and C373 to CR376, which also switches high.

In the Delayed (Runs After Delay Time) mode, the Delayed Trigger Generator operates the sam e as in the Normal mode. However, Q334 is cut off by the RUNS AFTER DELAY TIME switch, S250, and there is a delay between the time the Delaying Sweep Generator starts and the Delay Pick off pulse cuts off CR381.

In the Delayed (Triggerable After Delay Time) mode, the entire Delayed Trigger Generator is operating, but the Arming Tunnel Diode, CR372, is held low by the Delay Pick off signal until after the delay time.

When the Delay Pick off pulse cuts off CR381, the next positive pulse from CR314 sets CR372 high and 1 nanosecond later sets CR376 high.

3-5

Delayed Sweep Generator

The Delayed Sweep Generator produces a linear ramp waveform when gated by the Delayed Trigger Generator. The Delayed Sweep ramp is displayed as the Normal or Delayed Sweep trace.

The linear ramp waveform is produced by charging a capacitor from a constant current source. The slope of the ramp determ ines the time/division of the displayed trace.

Ramp Generator. When a trigger pulse is received from the Delayed Trigger Generator, Q502 cuts off and Q504 conducts, driving the base of Q510 high. When Q510 turns on, Q512 turns off and the timing current from Q 536 starts to charge the tim ing capacitors in a positive ramp. The tim ing current is determined by the timing resistors in the em itter circuit of Q536 and the reference voltage at the base of 0536. Transistors Q546A and B and Q550 form a unity-gain, voltage follower for the delaying sweep signal. The output of Q550 is attenuated by divider R557 and R558 before it is connected to the Output Amplifier. At 0.5 nanosecond/division, the Delayed Sweep ramp is not attenuated. The output of Q550 also drives the Sweep Stop Comparator and the Baseline Stabilizer.

Sweep Stop Comparator. Transistors Q562 and Q564 control the sweep length. W hen the Delayed Sweep ramp exceeds the voltage on the base of Q564, Q562 turns off and Q564 provides a positive pulse to end the Main Gate.

Main Gate Generator. When the trigger pulse cuts off 0502, the negative pulse at the base of Q572 causes the Main Gate at the emitter of 0584 to go high. The Main Gate signal rem ains high until a positive pulse from the Sweep Stop Comparator turns Q568 on, ending the Main Gate.

Baseline Stabilizer. W hen the Trigger Disable pulse resets the output of the Delayed Trigger Generator to a low level, 0502 turns on and Q504 turns off. The low level on the base of Q510 turns on Q512, which discharges the timing capacitors. With the timing capacitors discharged, the Bas eline Stabilizer maintains a constant output level.

The output of 0550 is compared with the reference on the base of Q522. If the output is less than the reference, 0530 charges the timing capacitors through CR534 until the output and reference voltages are equal. If the output is greater than the reference, Q530 conducts less and the timing capac itors discharge through 0512. When the two voltages are equal, the currents through Q530 and Q536 equal the current through Q512, which holds the voltage on the timing capacitors constant.

Auxiliary Y and Z Axis. The Aux. Y and Aux. Z outputs allow the 7B92A to control the trace separ ation, intensity, and contrast of the Delaying Sweep trace when the time base is operating in the Alternate mode.

The Aux. Y, Z Inhibit signal disables both outputs except when the time base is in the Intensified or Alternate modes, and the delaying sweep is being displayed. The CONTRAST control is active when operating in the ALT mode, and the Delayed Sweep Generator is running. The CONTRAST control varies the brightness of the intensified zone.

Horizontal Logic

The Horizontal Logic controls the different sweep modes and functions of the time base (e.g., sweep display, hold-off, auto-trigger, single-sweep, etc.). The Horizontal Logic also generates control signals for the oscilloscope mainframe.

Sweep Control IC. The Sweep Control IC, U820, generates most of the control signals us ed in the 7B92A.

When the MAIN T RIGGERING MODE is set to AUTO, the Sweep Control IC supplies a triggering gate to the Delaying Sweep Generator when the Main Trigger Generator is not triggered. The auto triggering circuit starts to operate if pin 19 of U820 is held low by S100 and an Auto Disable Pulse has not been received for about 40 milliseconds.

When the MAIN T RIGGERING MODE is set to SINGLE SWEEP, the Sweep Control IC allows one r amp to be displayed. The Trigger Disable signal then prevents another ramp from running until U820 is manually reset by pressing the SINGLE SWEEP-RESET button.

Lockout. When the 7B92A is used in a fourchannel oscilloscope mainframe in an Alternate mode with another time base, a Lockout signal prevents the 7B92A from running while the other time base is being displayed. The Lockout signal is coupled through the Lockout Amplifier, 0802, 0804, and 0806 to pin 18 of U820. The Lockout signal drives the Trigger Disable output (pin 17) high to reset and hold the trigger generator outputs low.

The 7B92A also outputs a Hold off pulse (pin B4) to the oscilloscope mainframe which controls the Lockout pulse to the other time base. The Hold off pulse occurs at the end of each Delaying Sweep ramp when the time base is in the Normal, Intensified or Delayed Sweep mode. When the time base is in the Alternate mode, the Hold off pulse occurs after the Delayed Sweep ramp is displayed.

REV A, JUN 1978

3-6

Theory of Operation-7B92A

NOTE

When operating in the Intens ified mode, the intensified zone is controlled by the intensity of the test oscilloscope instead of the 7B92A CONTRAST and IN TENSITY controls.

Sweep Display. The Sweep Display flip-flop, U856A, determines which sweep ramp is displayed. When the tim e base is in the Normal or Delayed Sweep mode, S800 connects R861 and R862 to ground. W ith the Set input of U856A low, pin 5 is held high and pin 6 is held low. The high level on pin 5 of U856A inhibits the Delaying Sweep signal at the Output Amplifier. T he low on pin 6 allows the Delayed Sweep signal to be coupled through the Output Amplifier to the oscilloscope mainframe.

If the time base is in the Alternate mode, the Set, J, and K inputs of U856A are all high. The end of each Aux. Gate pulse toggles U856A, which allows alternate display of the Delaying and Delayed Sweep ramps.

When the tim e base is in the Intensified Sweep mode, pin 15 of U856A is held low by pin 4of U635, clearing flip flop U856. With pin 5 of U856A low, the Delaying Sweep signal is coupled to the output amplifier.

Output Amplifier

The Output Amplifier connects the sweep signal to the oscilloscope mainframe and provides an offset voltage to position the trace on the graticule.

The Delaying Sweep and Delayed Sweep ramps are connected to Q900 and Q910, respectively. The Delaying Sweep Inhibit and Delayed Sweep Inhibit signals saturate either Q902 or Q912 to prevent that sweep ramp from being amplified and coupled to the oscilloscope mainframe.

The POSITION control, R930, offsets the ramp waveform to horizontally position the displayed trace. Transistors Q926 and 0932 tur n on when contact 52 is closed and the Delaying Sweep Inhibit signal is high.

These transistors pr ovide additional off set at fast sweep rates.

Theory of Operation-7B92A The positioning offset voltage and the selected sweep ramp are connected to 0942 and Q952. The push-pull output is connected to the oscilloscope mainframe through pins All and Bl1.

The Auxiliary Sweep Amplifier, Q456 and Q458, is a unity-gain amplifier that couples the Delaying Sweep ramp to the mainframe. This signal may be connected to the + Saw-tooth output of the oscilloscope mainframe.

Readout

The oscilloscope readout system in 7000-Ser ies Oscilloscopes provides alphanumeric display of information encoded by the plug-in units. This dis play is presented on the crt on a time-shared basis with the waveform display.

The oscilloscope readout system produces a pulse train consisting of 10 negative-going pulses called times lots. Each pulse represents a possible character in a readout word, and is assigned a time-slot number corresponding to its position in the word. Each tim e-slot pulse is directed to 1 of 10 lines, labeled TS-1 throughTS10 (time slots 1 through 10), which are connected to the vertical and horizontal plug-in compartments. Two output lines, row and column, are connected from each channel (two channels per plug-in compartment) back to the oscilloscope readout system.

Data is encoded on the output lines either by connecting resistors between the output lines and the time-slot input lines, or by generating equivalent currents. The resultant output is a sequence of analog current levels on the row and column output lines. The row and column current levels address a c haracter matrix during each time-slot; thus, selecting a character to be displayed or a special instruction to be followed.

The encoding resistors are selected by the TIME/DIV OR DLY TIME and DLY’D Time/Division switches. Table 3-1 lists the resistors that control the readout characters and functions.

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Theory of Operation-7B92A

Table 3-1.

7B92A READOUT CHARACTER SELECTION

Characters Time-Slot Description Encoded

Channel

(Delaying Sweep)

Decimal TS-1 Determines decimal magnitude (number

of zeros displayed or prefix change information).

Uncalibrated (>) TS-3 Indicates calibrated or uncalibrated sweep

rates

1, 2, 5 TS-4 Scaling R763, R764 m, /i, n, p TS-8 Defines the prefix which modifies the units

of measurement

s (seconds) TS-9 Defines the unit of measurement R784, R787 R789, R796

3-8

R761, R762

R781 R782 R792

R785 R765, R766 R783, R786

Channel

(Delayed Sweep)

R771, R772

R791

R773, R774

R793 R775, R776 R788, R795

Section 4-7B92A

MAINTENANCE

This section of the manual contains inform ation for performing preventive maintenanc e, troubleshooting, and corrective maintenance for this instrument.

PREVENTIVE MAINTENANCE

Preventive maintenance consis ts of cleaning, visual inspection, lubric ation, etc. Preventive maintenance perf ormed on a regular basis may prevent instrum ent breakdown and will improve the reliability of the instrument. The severity of the environment to which this instrument is subjected determines the frequency of maintenance. A convenient time to perform preventive maintenance is preceding adjustment of the instrument.

CLEANING

This instrument should be cleaned as often as operating conditions require. Accumulation of dirt on components acts as an insulating blanket and prevents eff icient heat dissipation that can cause overheating and component breakdown.

CAUTION

Avoid the use of chemical cleaning agents which might damage the plastics used in this instrument. In particular, avoid chemicals that contain benzene, toluene, xylem, acetone, or similar solvents.

Exterior

Loose dust accumulated on the front panel can be removed with a soft cloth or small brush. Dirt that remains can be removed with a soft cloth dam pened with a mild detergent and water solution. Abras ive cleaners should not be used.

Interior

Dust in the interior of the instrum ent should be removed occasionally due to its electrical conductivity under highhumidity conditions. The best way to clean the interior is to blow off the accumulated dust with dry, low pressure air. Remove any dirt that remains with a soft brush or a cloth dampened with a mild detergent and water solution. A cotton-tipped applicator is useful f or c leaning in narrow spaces.

Switch Contacts

Switch contacts and pads are designed to operate dry for the life of the switch. However, as the switches are not sealed, dust attracted to the contact area may cause switch contacts to become electrically noisy. Cleaning may be accomplished by flushing the contact area with isopropyl alcohol or kelite (1 part kelite to 20 parts water). Do not use chemical cleaning agents that leave a film or that might damage plastic parts. Do not use cotton swabs or similar applicators to apply cleaning agents, as they tend to snag and leave strands of cotton on switch contacts. Should it become necessary to remove a switch for replacement or cleaning, refer to Component Removal and Replacement in this section.

VISUAL INSPECTION

This instrument should be inspected occasionally for such defects as brok en connections, improperly seated semiconductors, damaged circuit boards, and heatdamaged parts.

The corrective procedure for most visible defects if obvious; however, particular care must be taken if heatdamaged components are found. Overheating usually indicates other trouble in the instrument; therefore, it is important that the cause of overheating be corrected to prevent recurrence of the damage.

LUBRICATION

Generally, there are no components in this instrument that requires a regular lubrication progr am during the life of the instrument.

4-1

Cam Switch Lubrication

In most cases, factory lubrication should be adequate for the life of the instrument. However, if the switch has been disassembled for replacement of switch s ub-parts, a lubrication kit containing the necessary lubricating materials and instructions is available through any Tektronix Field Office. Order Tektronix Part 003-0342-

01. General Electric Versilubee silicone grease should be applied sparingly so that the lubricant does not get on the contacts. Refer to Fig. 4-1 for lubrication instructions.

SEMICONDUCTOR CHECKS

Periodic checks of the semiconduc tors in this instrument are not recommended. The best check of semiconductor performance is actual operation in the instrument.

More details on checking semiconductor operation are given under Troubleshooting.

ADJUSTMENT AFTER REPAIR

After any electrical component has been replaced, the adjustment of that particular circuit should be checked, as well as the adjustment of other closely-related circuits. The Performance Check and Adjustment procedure in this manual provides a quick and convenient means of checking instrument operation. In some cases, minor troubles may be revealed or corrected by adjustment.

Maintenance-7B92A

Fig. 4-1. Lubrication procedure for typical cam switch.

4-2

Maintenance-7B92A

TROUBLESHOOTING

The following inform ation is provided to help troubleshoot this instrument. Information contained in other sections of this m anual should be used along with the following information to aid in locating the defective component. An understanding of the circuit operation is very helpful in locating troubles, particularly where integrated circuits are used.

TROUBLESHOOTING AIDS

Diagrams

Circuit diagrams are given on f old out pages in

Section 8. The component number and elec trical value of each component in this instrument is shown on the diagrams.

Components that are mounted on circuit boards

are outlined on the diagrams with a heavy black line.

Voltages and Waveforms

Typical operating voltages are shown on the

diagrams. Voltage Conditions given on the diagram page indicate the test equipment used and the frontpanel control status necessary to obtain the given voltages.

Typical operating waveforms are shown nex t to

the diagram where they were measured. Each waveform is numbered to locate the point on the diagram where the waveform was taken. Waveform Conditions given on the diagram page list the test equipment used and the front panel control status necessary to obtain the given waveform.

Circuit Board Illustrations

Circuit board illustrations are shown on the f old

out page preceding the associated diagram. Eac h board mounted electrical component is identified by its circuit number, as are interconnecting wires and connectors.

Figure 8-1, in the front of the diagrams sec tion,

shows the location and assembly number of each circ uit board in this instrument.

Diode Color Code

The cathode end of each glass- encased diode is indicated by a stripe, a series of stripes, or a dot. The cathode and anode ends of metal-encased diodes are identified by the diode symbol marked on the c ase. For most silicon or germanium diodes with a series of stripes, the color code identifies the f our signific ant digits of the JEDEC or vendor number using the resistor colorcode system.

Wiring Color Code

Insulated wire and cable used in this instrument is color-coded to facilitate circuit tracing.

Semiconductor Basing

Figure 4-2 illustrates the basing configurations for all semiconductors used in this instrument. Some plastic case transistors have lead conf igurations that do not agree with those shown here. If a replacement transistor is made by a different manufacturer than the original, check the manufacturer’s basing diagram. All transistor sockets in this instrument are wired for the standard basing used for metal-case transistors.

Inter-Board Pin Connector Identification

The inter-board pin connector sockets are installed on circuit boards in groups of 5 sockets ( as in Fig. 4-3). Socket number 1 is indexed on the circuit board with either a triangular mark or the number 1. Each group of sock ets is identif ied by its J (jac k ) num ber etched on the circuit board. The J num bers correlate to the J (jack) and P (plug) circuit numbers on the schematic diagrams.

Switch Cam Identification

Switch cam numbers shown on diagrams indicate the position of each cam in the com plete switch assembly. The switch cam s are numbered f rom front to rear.

4-3

Maintenance-7B92A

Fig. 4-2. Semiconductor lead configurations.

4-4

REV C, JUN1978

Maintenance-7B92A

Fig. 4-3. Inter-board multi-pin connector assembly.

Multi-Pin Connector Identification

Multi-pin connectors mate with groups of pins soldered to circuit boards. Pin num ber 1 is indexed with atriangular mark on the circuit board and m olded on the holder of the multi-pin connector , as shown in Fig. 4-4. Each group of pins is identified by its corresponding J number etched on the circuit board. T he J num bers, on the circuit boards, correlate to the J and P component numbers on the schematic diagrams.

Interface Connector Pin Locations

The Interface circuit boar d couples the plug-in unit to the associated mainfram e (oscilloscope). Figure 4-5 identifies the pins on the interface connector as shown on Interface Connectors and Power Supply diagram 8 in the Diagrams section.

Fig. 4-4. End-lead multi-pin connector assembly

REV B, JUN 1978

Fig. 4-5. Location of pin numbers of Interface

connector.

4-5

Maintenance-7B92A

Performance Check and Adjustment

The Performance Check and Adjustment procedure, given in Section 5 of this manual, provides a quick and convenient means of checking instrument operation. In some cases, minor troubles may be revealed or corrected by adjustment.

TROUBLESHOOTING EQUIPMENT

The following equipment, in addition to that listed in the Performance Check and Adjustment section, is useful for troubleshooting.

Transistor Tester.

Description: Dynamic-type tester.

Purpose: Test semiconductors.

Recommended T ektronix types: 576 Curve Tracer, 577/177 Curve Tracer system, 7CT 1N Curve T racer unit and a 7000-Series Oscilloscope system, or a 5CT1N Curve Tracer unit and a 5000-Series Oscilloscope.

Multimeter.

Description: Voltmeter, 10 megohm input impedance and a range from 0 to at least 50 volts dc; accuracy, within

0.1%. Ohmmeter, 0 to 20 megohms. Test probes should be insulated to prevent accidental shorting.

Purpose: Check voltage and resistance.

Test Oscilloscope.

Description’ Frequency response, dc to 100 megahertz minimum; deflection factor, 5 millivolts to 5 volts/division. A 10OX, 10 megohm voltage probe should be used to reduce circuit loading.

Purpose: Check operating. waveforms.

TROUBLESHOOTING TECHNIQUES

The following troubleshooting procedure is arranged to check the simple trouble possibilities before proceeding with extensive troubleshooting. The first few checks ensure proper connection, operation, and adjustment. If the trouble is not located by these checks, the rem aining steps aid in locating the defective component. When the defective component is located, it should be replaced using the replacement procedure given under Corrective Maintenance

Troubleshooting Procedure

1. Check Control Settings. Incorrect control

settings can indicate a trouble that does not exist. If there is any question about the correct function or operation of any control, see the Operating Instructions, Section 2.

2. Check Associated. Equipment. Before troubleshooting, check that the equipm ent used with this instrument is operating cor rectly. Check that the signal is properly connected and that the interconnecting cables are not defective. Also, check the power source. If the trouble persists, the time-base unit is probably at fault.

3. Visual Check. Visually check the portion of the instrument in which the trouble is located. Many troubles can be located by visible indications such as unsoldered connections, broken wires, damaged circuit boards, damaged components, etc.

4. Check Instrument Adjustment. Check the adjustment of this ins trument, or the affected cir cuit if the trouble appears in one circuit. The apparent trouble may be the result of misadjustment. Complete adjustment instructions are given in the Performance Check and Adjustment section.

5. Isolate Trouble to a Circuit. To isolate trouble to a circuit, note the trouble symptom. The symptom often identifies the c irc uit in which the tr ouble is located. When trouble symptoms appear in more than one circuit, check the af fected circuits by taking voltage and waveform readings. Incorrect operation of all circuits often indicates trouble in the power supply. Check first f or corr ect voltages of the individual supplies. However, a defective component elsewhere in the instrument can appear as a power-supply trouble and may also affect the operation of other circuits.

After the defective circuit has been located, proceed with steps 6 and 7 to locate the defective component(s).

6. Check Voltages and Waveforms. Often the defective component can be located by checking for the correct voltages and waveforms in the circuit. Ref er to the diagrams section at the rear of the manual for typical voltages and waveforms.

NOTE

Voltages and waveforms given on the diagrams are not absolute and may v ary slightly between instruments. To obtain operating conditions similar to those used to take these readings, see the voltage

4-6

REV A, JUN 1978

Maintenance-7B92A

and waveforms page adjacent to each schematic diagram. Note the recommended test equipment, frontpanel control settings, voltage and waveform conditions, and test equipment cable connection instructions.

7. Check Individual Components. The following procedures describe methods for checking individual components. Two-lead components that are soldered in place are best checked by first disconnecting one end.

This isolates the meas urement from the effects

of surrounding circuitry.

CAUTION

To avoid damage, disconnect the power source before removing or replacing semiconductors.

TRANSISTORS. The best check of transistor operation is actual performance under operating conditions. A transistor can be most ef fectively checked by substituting a new component or one that has been checked previously. However, be sure that circuit conditions are not such that a replacement transistor might also be damaged. If s ubstitute transistors are not available, use a dynamic tester. Static-type testers ar e not recommended, since they do not check operation under simulated operating conditions.

INTEGRATED CIRCUITS. Check with a voltmeter, test oscillosc ope, or by direct substitution. A good understanding of circuit operation is desirable when troubleshooting circuits using IC. Use care when checking voltages and waveform s around the IC so that adjacent leads are not shorted together. A convenient means of clipping a test pr obe to the 14and 16-pin IC is with an IC test clip. This device also serves as an extraction tool. The lead configuration for the semiconductors used in this instrument is shown on a pullout page in the front of the diagrams section.

DIODES. A diode can be checked f or an open or shorted condition by measuring the resistance between terminals with an ohmmeter scale having a low internal source current, such as the R X 1K scale. The resistance should be very high in one direction and very low when the meter leads are reversed.

RESISTORS. Check resistors with an ohmmeter. See the Replac eable Electrical Parts list for the tolerance of the resistors used in this instrument. Resistors normally do not need to be replaced unless the measured value varies widely from that specified.

INDUCTORS. Check for open inductors by checking continuity with an ohmmeter. Shorted or partially shorted inductors can usually be found by checking the waveform response when high-frequency signals are passed through the circuit. Partial shorting often reduces high frequency response.

CAPACITORS. A leaky or shorted capacitor c an usually be detected by checking resistance with an ohmmeter on the highest scale. Do not exceed the voltage rating of the capacitor. The resistance reading should be high after initial charge of the capacitor. An open capacitor can best be detected with a capacitance meter or by checking that the capacitor passes ac signals.

8. Repair and Adjustment.

parts are located, follow the replacement procedures given in Corrective Maintenance. Be sure to check the performance of any circuit that has been repaired or had any electrical components replaced.

If any defective

Do not use an ohmmeter s cale that has a high internal current. High currents may damage the diode.

REV A, JUN 1978

CAUTION

4-7

CORRECTIVE MAINTENANCE

Corrective maintenance consists of component replacement and instrument repair. Special

techniques required to replace components in this instrument are given here.

Maintenance-7B92A

OBTAINING REPLACEMENT PARTS

All electrical and mechanical part replacements can be obtained through your Tektronix field Office or representative. However, many of the standard electronic components can be obtained locally in less time than is required to order them from Tektronix, Inc. Before purchasing or ordering replacement parts , check the parts list for value, tolerance, rating, and description.

NOTE

When selecting replacement parts, remember that the physical size and shape of a component may affect the performance of the instrument, particularly at high frequencies. All parts should be direct replacements unless a different component will not adversely affect instrument performance.

Some parts are manufactured or selected by Tektronix, Inc. to satisfy particular r equirements, or are manufactured to specifications for Tektronix, Inc. Most of the mechanical parts used in this instrument have been manufactured by Tektronix Inc. To determine the manufacturer of parts, refer to parts lis t, Cros s Index Mfr . Code Number to Manufacturer.

When ordering replacement parts from Tektronix, Inc., include the following information: 1. Instrument type.

2. Instrument serial number.

3. A description of the part (if electrical, include

circuit number).

4. Tektronix part number.

SOLDERING TECHNIQUES

WARNING

To avoid electrical shock, disc onnect the instrument from the power source befor e soldering.

The reliability and accuracy of this ins trument can be maintained only if proper soldering techniques are used when repairing or replacing parts. General soldering techniques, which apply to maintenance of any precision electronic equipment, should be used when working on this instrument. Use only 60/40 rosin-core, electronic grade solder. The choice of soldering iron is determined by the repair to be made. When soldering on circuit boards, use a 15to 40-watt pencil-type soldering iron with a 1/8-inch wide wedge-shaped tip. Keep the tip properly tinned for best heat transfer to the solder joint. A higher wattage soldering iron may separate the wiring from the base material. Avoid excess ive heat; apply only enough heat to remove the component or to make a good solder joint. Also, apply only enough solder to make a firm solder joint; do not apply too much solder.,

CAUTION

All circuit boards, except the Readout circuit board, in this instrument ar e multilayer type boards with a conductive path(s) laminated between the top and bottom board layers. All soldering on these boards should be done with extreme care to prevent breaking the connections to the center conductor(s); only experienced maintenance personnel should attempt repair of thes e boards.

For metal terminals (e.g., switch terminals, potentiometers, etc.), a higher wattage-rating soldering iron may be required. Match the soldering iron to the work being done. For example, if the component is connected to the chassis or other large heat-radiating surface, it will required a 75-watt or larger soldering iron.

The following techniques should be used to replace a component on a circuit board: 1. Grip the component lead with long-nose pliers.

1.Touch the soldering iron to the lead at the solder connection. Do not lay the iron directly on the board, as it may damage the board.

REV A, JUN 1978

2.When the solder begins to melt, gently pull the lead out. If unable to pull out the lead without using force, try removing the other end of the component as it may be more easily removed.

4-8

Maintenance-7B92A

NOTE

The reason some component leads ar e troublesome to remove is due to a bend placed on each lead during the manufacturing process. The bent leads hold components in place during a process that solders many components at one time.

If a component lead is extremely difficult to remove, it may be helpful to straighten the leads on the back side of the board with a sm all screwdriver or plier s while heating the soldered connection.

Use only enough heat to remove the component lead without removing the solder from the board. If it is desired to remove solder from a circuit-board hole for easier installation of a new component, a solderremoving wick should be used.

3. Bend the leads of the new component to fit the holes in the board. If the component is replaced while the board is mounted in the instrument, cut the leads so they will just protrude through the board. Insert the leads into the holes so the component is firmly seated against the board (or as positioned originally). If it does not seat properly, heat the solder and gently press the component into place.

4. Touch the iron to the connection and apply a small amount of solder to mak e a firm solder joint. To protect heat-sensitive components, hold the lead between the component body and the solder joint with a pair of long nose pliers or other heat sink.

5. Clip any excess lead protruding through the board (if not clipped in step 3).

6. Clean the area around the solder connection with a flux-removing solvent. Be careful not to remove information printed on the board.

Component Removal and Replacement

WARNING

Disconnect the instrument from the power source before replacing components.

Semiconductors. Semiconductor devices used in this instrument should not be replaced unless actually defective. If removed from their sockets during routine maintenance, return them to their original sockets. Ferrite beads must be reinstalled on the proper leads.

REV A, JUN 1978

Unnecessary replacement may affect the calibration of this instrument. When a semiconductor is replaced, check the operation of the part of the instrument that may be affected.

Replacement devices should be of the original type or a direct replacement. Ins tall in the same manner as the original. Figure 4-2 shows the lead configurations of the semiconductor devices used in this instrument. When replacing, check the manufacturer’s basing diagram for correct basing.

Interconnecting Pins. Two methods of interconnection are used in this instrument to connect the circuit boards with other boards and components. When the interc onnec tion is made with a coaxial cable, a special end lead connector plugs into a socket on the board. Other interconnections are made with a pin soldered onto the board. Two types of mating connectors are used for these interconnecting pins. If the mating connector is mounted on a plug-on circuit board, a special socket is solder ed into the board. If the mating connector is on the end of a lead, an end-lead pin connector that mates with the interconnecting pin is used. The following information provides the replacement procedure for the various interconnecting methods.

COAXIAL-TYPE END-LEAD CONNECTORS. Replacement of the coaxial-type end-lead connectors requires special tools and techniques . Only exper ienced maintenance personnel should attempt replacement of these connectors. It is recommended that the c able or wiring harness be replaced as a unit. For cable or wiring harness part numbers, see the Replac eable Mechanical Parts list. An alternate solution is to refer the replacement of the defective c onnector to your Tektronix Field Office or representative.

CIRCUIT BOARD PINS AND PIN SOCKETS. A circuit board pin replacement kit, including necessary tools, instructions, and replacement pins, is available from Tek tronix, Inc. (Tektronix Part Num ber 040-0542-

00.)

CAUTION

The following procedures are recommended for single-layer circuit boards only. Pin and socket replacement on multi-layer circuit boards should be performed only by qualified service personnel. Refer to your local Tektronix Field Office or Service Center.

The pin sockets on the circuit boards are s oldered to the board. To replace one of these sockets, first unsolder the pin socket (use vacuum-type desoldering tool to

4-9

Maintenance-7B92A

remove the excess s older). Then straighten the tabs on the socket and remove it from the hole in the board. Place the new socket in the circuit board hole and press the tabs down against the board. Solder the tabs of the socket to the circuit board; be careful not to get solder into the socket.

END-LEAD PIN CONNECTORS. The pin connectors used to connect the wires to the interconnecting pins are clamped to the ends of the associated leads. To replace damaged end-lead pin connectors, remove the old connector from the end of the lead and clamp the replacement connector to the lead.

Some of the pin connectors are grouped together and mounted in a plastic holder; the overall res ult is that these connectors are rem oved and installed as a multipin connector. To provide correct orientation of this multi-pi n connector when it is replaced, an arrow (or dot) is stamped on the circuit board and a matching arrow is molded into the plastic housing of the multi-pin connector. Be sure that these arrows are aligned when the multi-pin connector is replaced. If the individual endlead pin connectors are removed f rom the plas tic holder, note the color of the individual wires for replacement.

Switches. Pushbutton and cam-type switches are used in the 7B92A. Contact alignment and spacing is critical to the operation of these switches. Therefore, defective switches should be replaced as a unit or repaired only by personnel experienced with switches of this type. Your local Tektronix, Inc. Field Office can provide additional repair information and instructions.

CAM SWITCH. The cam switch (TIME/DIV OR DLY TIME and DLY’d Time/Division) consists of two rotating cams and the associated contacts mounted on the Interface and Readout boards. The cam switch can be disassembled for cleaning, repair, or replacement; however, it is recomm ended that the cam assembly be removed from the instrument as a unit.

Remove the cam switch as follows: 1. Set the TIME/DIV OR DLY TIME and DLY’D Time/Division switches to 0.2 s and press the knob in.

2. Press and release the VARIABLE knob.

3. Loosen the set screws and remove the

VARIABLE and DLY’D Time/Division knobs.

4. Loosen the set screw in the clear plastic flange (behind sub-panel) and remove the TIME/DIV OR DLY TIME flange.

5. Remove the pin connector from the microswitch (in front of the cam ) to the front of the Interfac e board.

6. Remove the Sweep Logic board.

7. Remove the 11 mounting screws holding the cam switch assembly to the Interface board. Do not remove the mounting screws from the Readout board.

8. Carefully lift the cam-switch assembly and Readout board from the interconnecting pins at the rear of the Readout board.

9. To replace the cam-switch assembly, reverse the above procedure. Be sure to replace the TIME/DIV OR DLY TIME flange and the DLY’D Time/Division knob in the same position from which they were removed.

TRIGGERING SWITCHES. Remove the Main and

Delayed Triggering switches as follows:

1. Perform steps 1 through 4 of the cam-switch replacement procedure.

2. Loosen the set screws and remove all front panel knobs except the DELAY TIME MULT dial.

3. Unsnap the front panel from the top and bottom of the sub-panel.

4. Remove the spring from the 7B92A release latch.

5. Remove the 4 screws holding the sub-panel to the chassis and pull the sub-panel forward.

6. Remove all necessary multi-pin and coaxial connectors.

7. Remove the mounting screws from the desired switch(es).

8. The MAIN TRIGGERING switches must be removed as an assembly (all three switches) and then disassembled further.

REV A, JUN 1978

4-10

Maintenance-7B92A

9. To replace the triggering switches , reverse the

above procedure.

ADJUSTMENT AFTER REPAIR

After any electrical component has been replaced, the adjustment of that particular circuit should be checked, as well as other closely related circuits. See Adjustment section for a complete adjustment procedure.

REPACKAGING FOR SHIPMENT

If the Tektronix instrument is to be shipped to a Tektronix Service Center for service or repair, attach a tag ;showing: owner (with address) and the name of an individual at your firm that can be contacted, complete instrument serial number, and a description of the service required.

Save and re-use the package in which your instrument was shipped. If the original pack aging is unfit for use or not available, repackage the instrument as follows:

1. Obtain a carton of corrugated cardboard having

inside dimensions of no less than six inches m ore

than the instrument dim ensions; this will allow for

cushioning. Refer to the following table for carton

test strength requirements.

2. Surround the instrument with polyethylene

sheeting to protect the finish of the instrument.

3. Cushion the instrument on all sides by tightly

packing dunnage or urethane foam between

carton and instrument, allowing three inches on all

sides.

4. Seal carton with shipping tape or industrial stapler.

SHIPPING CARTON TEST STRENGTH

Gross Weight (lb) Carton Test Strength (lb)

0-10 200

10-30 275

30-120 375 120-140 500 140-160 600

REV C, JUN 1978

4-11

PERFORMANCE CHECK/CALIBRATION

Section 5-7B92A

PRELIMINARY INFORMATION

Calibration Interval

To ensure instrument accuracy, check the calibration of the 7B92A every 1000 hours of operation, or every six months if used infrequently. Before complete calibration, thoroughly clean and inspect this instrument as outlined in the Maintenance section.

Tektronix Field Service

Tektronix, Inc. provides complete instrument repair and recalibration at local Field Service Centers and the Factory Service Center. Contact your local Tektronix Field Office or representative for further information.

Using This Procedure

Outline. To aid in locating a step in the

Performance Check or Calibration procedure, outlines are given preceding Part I-Perform ance Check and Part II Calibration procedure.

Performance Check. The performance of this instrument can be check ed without removing the covers or making internal adjustments by performing Part Performance Check. This procedure does not check every facet of the instrument’s calibration; but is concerned primarily with those portions of the instr ument essential to measurement accuracy and correct operation.

Calibration Procedure. Completion of Part II Calibration procedure ensures that this instr um ent m eets the electrical specifications given in the Operators manual. Where possible, instrument performance is checked before an adjus tment is made. For best over all instrument performance when performing a complete calibration procedure, make each adjustment to the exact setting, even if the Check is within the allowable tolerance.

Partial Calibration. A partial calibration is often desirable after replacing com ponents, or to touch up the adjustment of a portion of the instrument between major recalibrations.

The Calibration procedure is divided into Triggering Calibration and Sweep Calibration. To perform a partial calibration, star t at the beginning of the desired section. To prevent unneces sary rec alibration of other parts of the instrument, readjust only if the tolerance given in the Check part of the step is not met.

TEST EQUIPMENT REQUIRED

The following test equipment and accessories, or their equivalents, are required for c omplete c alibration of the 7B92A. Specifications given for the test equipm ent are the minimum necessary for accurate calibration. Therefore, some of the specifications listed here may differ from the actual perf ormanc e capabilities of the test equipment. All test equipment is assumed to be correctly calibrated and operating within the listed specifications. Detailed operating instructions for the test equipment are not given in this procedure. Ref er to the test equipment instruction manual if more information is needed.

If only a Performance Check procedure is performed, not all of the listed test equipment will be required. Items used only for the Calibration pr ocedure are indicated by footnote 1. The remaining pieces of equipment are items common to both the Performance Check and the Calibration procedure.

Special Calibration Fixtures

Special Tektronix calibration fix tures are used only where they facilitate instrument calibration. These special calibration fixtures are available from Tektronix, Inc. Order by part number through your local Tekt ronix Field Office or representative.

Calibration Equipment Alternatives

The Calibration procedure is based on the first item of equipment given as an example of applicable equipment. When other equipment is substituted, control settings or calibration setup may need to be altered slightly to meet the requirements of the subs titute equipment. If the exact item of test equipment is not available, first check the Minimum Specifications column in Table 5-1 carefully to see if any other equipment is available that might suffice.

REV A, JUN 1978

5-1

Table 5-1.

TEST EQUIPMENT

Description Minimum Specifications Purpose

Performance Check/Calibration-7B92A

Examples of Applicable

Test Equipment

1. Oscilloscope Bandwidth 500 MHz Used throughout procedure to provide a display.

2. Wide-Band Amplifier

Plug-In Unit

Bandwidth 500 MHz; Deflection factor 50 mV to 5 V

Used throughout procedure to provide vertical input to oscilloscope system.

3. Fast-Rise Pulse

Generator

4. Time-Mark Generator Marker outputs, 2 ns to 0.5 s

200 mV positive-going output pulse; rise time 1 ns or less

within 0.1%

Time position check and adjustment

Sweep timing checks and adjustments. Sweep delay checks and adjustments.

5. Low-Frequency Sine-

wave Generator

Frequency, 30 Hz to 50 kHz; output amplitude, variable from

Low-frequency triggering checks and adjustments

200 mV to 8 V.

6. Medium-Frequency

Signal Generator

Frequency, 20 MHz to 100 MHz; output amplitude, variable from

20 MHz triggering checks a. TEKTRONIX SG 503

100 mV to 500 mV.

7. High-Frequency

Signal Generator

Frequency, 245 MHz to 1000 MHz; output amplitude variable from 0.5 V to 4 V

High-frequency triggering checks. Hf sync operation checks. Trigger jitter checks.

8. Digital Voltmeter Range 0 to 50 V; accuracy within

0.1% checks.

9. Termination Impedance 50 Ò accuracy, within

connectors, bnc.2%;

10. Plug-In Extender’ Provides access to 7B92A

adjustments

Used throughout procedure for voltage Output termination for fastrise generator Used throughout procedure adjustments and test points to provide access to internal

11. Tee Connector Connectors, bnc External trigger checks, adjustments. Hf sync operation checks. Trigger jitter checks

TEKTRONIX 79040scilloscope TEKTRONIX 7A19 Amplifier plug-in unit.

TEKTRONIX PG 506 Calibration Generator.

a. TEKTRONIX TG 501 Time- Mark Generator.2 b. TEKTRONIX 2901 TimeMark Generator a. TEKTRONIX FG 503 Function Generator.

b. General Radio 1310-B Oscillator.

Sine-Wave Generator.

b. TEKTRONIX 191 SineWave Generator. a. TEKTRONIX SG 504 Leveled Sine-Wave Generator.

b. Wavetek 1002 Sweep/Signal Generator. c. General Radio 1362 UHF Oscillator with 1263-C Amplitude-Regulating Power Supply. TEKTRONIX DM 501 Digital Multimeter. Tektronix Part No. 0110049-01. Tektronix Part No. 0670589-00 Calibration Fixture.

Tektronix Part No. 1030030-00.

5-2

Performance Check/Calibration-7B92A

Table 5-1. (cont)

Examples of Applicable

Description Minimum Specifications Purpose Test Equipment

12. Cable Impedance, 50 0; type RG-58/U;

length, 18 inches; connectors,

Used throughout procedure for signal interconnection.

Tektronix Part No. 0120076-00.

bnc.

13. Cable Impedance, 50 0; type RG-58/U,

length 42 inches; connectors, bnc.

14. Screwdriver Three-inch shaft, 3/32 inch bit. Used to adjust variable

Used throughout procedure for signal interconnection

Tektronix Part No. 0120057-01. Xcelite R-3323.

resistors.

15. Low Capacitance’

Screwdriver

Used for calibration only; NOT used for performance check.

Requires a TM 500-Series Power Module.

1-1/2 inch shaft. Used to adjust variable

capacitors

Tektronix Part No. 0030000-00.

5-3

Performance Check/Calibration-7B92A

PART I-PERFORMANCE CHECK

The following procedure is intended to be used f or inspection and periodic calibration checks to confirm that the 7B92A is operating within acceptable limits. T his proc edure is conc erned with those por tions of the instr ument calibration that are essential to measurement accuracy and correct operation. Removal of the side covers is not necessary to perform this procedure in that all checks are made from the front panel.

OUTLINE FOR PART I-

PERFORMANCE CHECK

A. Trigger Sensitivity Page

1. Check Main Triggering Level Range 5-5

2. Check Delayed Triggering Level Range 5-6

3. Check Low-Frequency Triggering 5-6

4. Check AC LF Reject Operation 5-7

5. Check 20 MHz Triggering 5-7

6. Check 500 MHz Triggering 5-8

7. Check HF Sync Triggering 5-9

8. Check Line Triggering 5-9

9. Check Single Sweep Operation 5-9

B. Horizontal System

1. Set Basic Sweep Calibration 5-10

2. Check Trace Separation Range

(SN B059999-below) 5-10

3. Check Trace Separation Range and

ALT OFF Function (SN B060000-above) 5-10

4. Check Sweep Timing 5-10

5. Check Sweep Linearity 5-12

6. Check VARIABLE Time/Division Range 5-12

7. Check Differential Delay Time Accuracy 5-13

8. Check Fast Delay Time Accuracy 5-14

9. Check Delay Jitter 5-14

PRELIMINARY PROCEDURE

1. Install the amplifier plug-in unit in a vertical

compartment of the oscilloscope.

2. Install the 7B92A into the horizontal

compartment of the oscilloscope.

3. Set the oscilloscope vertical mode switch to display the vertical unit and the horizontal mode switch to display the horizontal unit.

4. Set the oscilloscope intensity controls fully counterclockwise and set the trigger s ource switches to vertical mode.

Page

5. Turn on the oscilloscope and allow at least 20 minutes warm up before beginning the procedure.

5-4

Equipment Required

1. Oscilloscope 5. Low-frequency sine-wave generator

2. Wide-band vertical amplifier plug-in unit 6. Time-mark generator

3. High-frequency signal generator 7. Tee connector, bnc

4. Medium-frequency signal generator 8. 50 n cables (2)

Performance Check/Calibration-7B92A

A. TRIGGER SENSITIVITY

Control Settings

Set the 7B92A controls as follows:

SLOPE + LEVEL Midrange MODE AUTO COUPLING AC SOURCE INT

POSITION Midrange TIME/DIV OR DLY TIME 20 /s DLY’D Time/Division 10,us/PULL FOR ALT VARIABLE (CAL IN) In DELAY TIME MULT 1.0 TRACE SEP Clockwise INTENSITY As desired CONTRAST As desired

LEVEL RUNS AFTER DELAY TIME SLOPE + COUPLING AC SOURCE INT

MAIN TRIGGERING

Sweep Controls

Delayed Triggering

Inputs

A1. Check Main Triggering Level Range

a. Set the vertical amplifier plug-in unit controls as

follows:

Position midrange Polarity + Up Input Coupling dc Volts/Division 1 V

b. Connect the bnc tee connector to the input of

the vertical amplifier plug-in unit.

c. Connect a 50-n cable from the low-frequency

sine-wave generator to the tee connector.

d. Connect a 50-n cable from the tee connec tor to

the MAIN TRIG IN connector.

e. Set the oscilloscope intensity and focus controls

for the desired display.

f. Set the low-frequency sine-wave generator for an eight-division display at 50 kHz. Center the display vertically on the graticule.

TERM 1 M Ò (in)

g. Check-that all levels of the positive slope may be selected for the sweep starting point as the MAIN TRIGGERING LEVEL control is rotated throughout its range, and that triggering occurs at least 3.5 divisions above and below the center horizontal graticule line. See’ Fig. 5-1 for reference.

h. Check-set the MAIN TRIGGERING SLOPE to and repeat part g for the negative slope of the waveform.

5-5

Performance Check/Calibration-7B92A

throughout its range, and that triggering occurs at least

3.5 divisions above and below the center horizontal graticule line. See Fig. 5-2 for reference.

Fig. 5-1. Main Triggering level range.

i. Check-set the MAIN TRIGGERING SOURCE to

EXT and repeat part g of this step.

j. Check-set the MAIN TRIGGERING SLOPE to +

and repeat part g for the positive slope of the waveform.

A2. Check Delayed Triggering Level Range

a. Disconnect the 50-n cable from the MAIN T RIG IN connector and reconnect it to the DLY’D TRIG IN connector.

b. Set the Delayed Triggering SOURCE and MAIN TRIGGERING SOURCE to INT.

c. Check-that all levels of the positive slope of the intensified zone may be selected for the sweep starting point as the Delayed Triggering LEVEL control is rotated

Fig. 5-2. Delayed Triggering level range.

d. Check-set the Delayed Triggering SLOPE to

and repeat part c for the negative slope of the waveform.

e. Check-set the Delayed Triggering SOURCE to

EXT and repeat part c of this step.

f. Check-set the Delayed Triggering SLOPE to +

and repeat part c for the positive slope of the waveform.

A3. Check Low-Frequency Triggering

a. Disconnect the 50-n cable from the DLY’D TRIG IN connector and reconnect it to the MAIN TRIG IN connector

5-6

Performance Check/Calibration-7B92A

b. Set the 7B92A controls as follows: MAIN TRIGGERING AC

COUPLING

Delayed Triggering +

SLOPE

Delayed Triggering AC

COUPLING

Delayed Triggering INT

SOURCE

Delayed Triggering RUNS AFTER

LEVEL DELAY TIME TIME/DIV OR DLY TIME 10 ms DLY’D Time/Division 2 ms/PULL FOR ALT DELAY TIME MULT dial 1.0

c. Set the vertical amplifier plug-in unit

volts/division switch to 0.2 V.

d. Set the low-frequency sine-wave generator for

a0.5 division (100 mV) display at 30 Hz.

e. Check-for stable display (TRIG’D light on) at all settings of the LEVEL control with MAIN TRIGGERING COUPLING set to:

(1.) AC (2.) AC HF REJ

(3.) DC (Set the MAIN TRIGGERING LEVEL control as necessary.)

f. Check-set the MAIN TRIGGERING SOURCE to

EXT and repeat part e of this step.

g. Disconnect the 50-0 cable from the MAIN T RIG IN connector and reconnect it to the DLY’D TRIG IN connector.

h. Set the control settings as follows:

MAIN TRIGGERING INT

SOURCE

Delayed Triggering near "O"

LEVEL

Delayed Triggering EXT

SOURCE

i. Check-for stable display (TRIG’D light on) at all settings of LEVEL controls with Delayed Triggering COUPLING set to:

(1.) AC

(2.) DC (Set the MAIN and Delayed Triggering LEVEL controls as necessary.)

j. Check-set the Delayed Triggering SOURCE to

INT and repeat part i of this step.

A4. Check AC LF Reject Operation

a. Disconnect the 50-n cable from the DLY’D TRIG IN connector and reconnect it to the MAIN TRIG IN connector.

b. Set the vertical amplifier plug-in unit volts/division switch to 0.5 V.

c. Set the low-frequency sine-wave generator for an eight-division display at 60 Hz. Center the display vertically on the graticule.

d. Check-set the MAIN TRIGGERING LEVEL control for a stable display (TRIG’D light on).

e. Set the MAIN TRIGGERING COUPLING to AC LF REJ; set the MODE to NORM.

f. Check-for no display (TRIG’D light off ) when the MAIN TRIGGERING LEVEL control is r otated throughout its range.

g. Set the MAIN TRIGGERING COUPLING to AC; set the SOURCE to EXT.

h. Reduce the output of the low-frequency sinewave generator to provide a six-division display (3.0 V) at 60 Hz.

(Adjust the MAIN TRIGGERING LEVEL control to maintain a stable display.)

i. Set the MAIN TRIGGERING COUPLING to AC LF REJ and repeat part f of this step.

A5. Check 20 MHz Triggering

a. Set the vertical amplifier plug-in unit volts/division switch to 0.2 V.

b. Set the 7B92A controls as follows:

MAIN TRIGGERING AC

COUPLING

MAIN TRIGGERING AUTO

MODE

MAIN TRIGGERING INT

SOURCE

5-7

Performance Check/Calibration-7B92A

Delayed Triggering All pushbuttons in

COUPLING, SOURCE

and SLOPE Delayed Triggering RUNS AFTER LEVEL DELAY TIME TIME/DIV OR DLY TIME 50 ns DLY’D Time/Division 5 ns/PULL FOR ALT

c. Disconnect the 50-n cable from the lowfrequency sine-wave generator and connect the mediumfrequency signal generator to the vertical amplifier plugin unit input using the 50-n cable.

d. Set the medium-frequenc y signal generator for a 0.5 division display (100 mV) at 20 MHz.

e. Check-for a stable display (TRIG’D light on) with the MAIN TRIGGERING COUPLING switch set to:

(1.) AC (2.) AC LF REJ

(3.) DC (Set the MAIN TRIGGERING LEVEL control as necessary.)

f. Check-change the MAIN TRIGGERING

SOURCE to EXT and repeat part e of this step.

g. Disconnect the 50-n cable from the MAIN T RIG IN connector and reconnect it to the DLY’D TRIG IN connector.

h. Set the Delayed Triggering LEVEL control near "O".

i. Set the MAIN TRIGGERING SOURCE to INT and MAIN TRIGGERING COUPLING to AC.

j. Check-for a s table display (TRIG’D light on) with the Delayed Triggering COUPLING set to:

(1.) AC (2.) DC

k. Set the Delayed Triggering SOURCE to EXT and repeat part j of this step.

A6. Check 180 MHz Triggering

a. Connect the high-frequency leveled sine-wave generator to the bnc tee connected to the vertical amplifier plug-in unit input.

b. Disconnect the 50-n cable from the DLY’D TRIG IN connector and reconnect it to the MAIN TRIG IN connector.

c. Set the 7B92A controls as follows:

MAIN TRIGGERING DC COUPLING MAIN TRIGGERING EXT SOURCE TIME/DIV OR DLY TIME 2 ns DLY’D Time/Division 2 ns (knob in)

d. Adjust the oscilloscope intensity control for normal viewing.

e. Set the vertical amplifier plug-in unit volts/division switch to 0.5 V.

f. Set the high-frequency leveled sine-wave generator for a one-division display at 180 MHz. Center the display vertically on the graticule.

g. Set the MAIN TRIGGERING LEVEL control for a stable display (TRIG’D light on).

h. Check-for a stable display with no more than

0.05 division of jitter.

i. Check-change the MAIN TRIGGERING SOURCE to INT and repeat parts g and h of this step.

j. Disconnect the 50-0 cable fr om the MAIN TRIG IN connector and reconnect it to the DLY’D TRIG IN connector.

k. Set the DLY’D Time/Division to PULL FOR ALT; set the Delayed Triggering SOURCE to EXT.

I. Set the Delayed Triggering LEVEL control for a stable display (near "O").

I. Disconnect the 50-n cable from the mediumfrequency signal generator; disconnect the 50-n cable from the bnc tee at the vertical amplifier plug-in input connector.

5-8

Performance Check/Calibration-7B92A

m. Check-f or a stable display with no more than

0.05 division of jitter.

n. Check-change Delayed Triggering SOURCE to INT and repeat m of this step.

A7. Check HF Sync Triggering

a. Disconnect the 50-n cable from the DLY’D TRIG IN connector and reconnect it to the MAIN TRIG IN connector.

b. Set the Delayed Triggering LEVEL control to RUNS AFTER DELAY TIME.

c. Set the DLY’D Time/Division switch to Normal mode (knob in).

d. Set the MAIN TRIGGERING MODE to HF SYNC.

e. Set the vertical amplifier plug-in unit volts/division switch to 1 V.

f. Set the MAIN TRIGGERING LEVEL control for a stable display (TRIG’D light on).

g. Check-for a stable display with no more than

0.05 division of jitter.

h. Set the high-frequency leveled sine-wave generator for a one-division display.

i. Check-change the MAIN TRIGGERING SOURCE to EXT 10 and repeat part g of this step.

c. Check-set the MAIN TRIGGERING LEVEL

control near "0" and check that the TRIG’D light is on.

d. Check-that the display is not triggered (TRIG’D light off) at either end of the MAIN T RIGGERING LEVEL control rotation.

A9. Check Single Sweep Operation

a. Connect the time-mar k gener ator to the input of the vertical amplifier plug- in unit, using a 50-n cable; set the generator for 1 ms markers.

b. Set the vertical amplifier plug-in unit deflec tion factor for approximately two divisions of display; and adjust MAIN TRIGGERING LEVEL control for a stable display.

c. Set the MAIN TRIGGERING SOURCE to INT, MODE to SINGLE SWEEP, and SOURCE to EXT.

d. Press the SINGLE SWEEP RESET pushbutton; it should be lit.

e. Check-change the MAIN TRIGGERING SOURCE to INT and observe that only one sweep is displayed and SINGLE SWEEP RESET pushbutton goes out.

f. Set the TIME/DIV OR DLY TIME switch to Alternate mode (PULL FOR ALT).

g. Set the MAIN TRIGGERING SOURCE to EXT; press the SINGLE SWEEP RESET pushbutton. The pushbutton should be lit.

j. Disconnect the 50-Ò cable from the high-

frequency leveled sine-wave generator.

A8. Check Line Triggering

a. Disconnect the 50-Ò cable from the MAIN T RIG

IN connector.

b. Set the MAIN TRIGGERING MODE to AUTO, SOURCE to LINE, and COUPLING to AC; the TIME/DIV OR DLY TIME switch to 1 ms; and DLY’D Time/Divis ion to 1 ms (knob in).

h. Check-change the MAIN TRIGGERING SOURCE to INT and observe that only one sweep is displayed and SINGLE SWEEP RESET pushbutton goes out.

i. Press SINGLE SWEEP RESET pushbutton several times and observe that display alternates between Delaying and Delayed sweeps.

5-9

Equipment Required

1. Oscilloscope 3. Time-mark generator

2. Wide-band vertical amplifier plug-in unit 4. 50-Ò cable

B1. Set Basic Sweep Calibration

a. Set the 7B92A controls as follows:

MAIN TRIGGERING

SLOPE + LEVEL Midrange MODE NORM COUPLING AC SOURCE INT

Performance Check/Calibration-7B92A

B. HORIZONTAL SYSTEM

Sweep Controls

POSITION Midrange TIME/DIV OR DLY TIME 1 ms DLY’D Time/Division 1 ms (knob in)

Delayed Triggering

LEVELRUNS AFTER

DELAY TIME

b. Connect the time-mark generator to the vertical amplifier plug-in unit input with a50-Q cable. Set the time mark generator for 1 ms markers.

c. Set the oscilloscope intensity and focus c ontrols for a desired display.

d. Set the vertical amplifier plug-in unit for approxim ately two divisions of display. Position the display in the center graticule area. Set the MAIN TRIGGERING LEVEL control for a stable display (TRIG’D light on).

e. Set the front panel SWP CAL adjustment for one marker/division over the center eight divisions (position as necessary).

B2 Check Alt Off Function

a. Check-for Delaying sweep (with intensified zone) positioned at least 3.5 divisions above Delayed sweep.

b. Check-for an intensified por tion on the Delaying sweep, and that the gate (checked at oscilloscope Gate Out connector) is not divided by two.

B3 Check Sweep Timing

NOTE

The tolerances given in Table 5-2 are for

ambient temperature range of +150°C to +35°C. If outside this range, see the Specification section for applicable tolerances.

a. Set the TIME/DIV OR DLY TIME, DLY’D Time/Division in Alternate mode (PULL FOR ALT), and time-mark generator as indicated in Table 5-2; set DELAY TIME MULT dial to 0.0.

5-10

Performance Check/Calibration-7B92A

Table 5-2.

SWEEP TIMING

Tolerance

TIME/DIV Time-Mark (+15°C to +35°C)

OR DLY'D Generator

DLY TIME Time/Division Setting Delaying Sweep Delayed Sweep

0.2 s 0.2 s 0.2 s Within 0.16 div Within 0.16 div

0.1 s 0.1 s 0.1 s Within 0.16 div Within 0.16 div 50 ms 50 ms 50 ms Within 0.16 div Within 0.16 div 20 ms 20 ms 20 ms Within 0.16 div Within 0.16 div 10 ms 10 ms 10 ms Within 0.16 div Within 0.16 div

5 ms 5 ms 5 ms Within 0.16 div Within 0.16 div 2 ms 2 ms 2 ms Within 0.16 div Within 0.16 div 1 ms 1 ms 1 ms Within 0.16 div Within 0.16 div

0.5 ms 0.5 ms 0.5 ms Within 0.16 div Within 0.16 div

0.2 ms 0.2 ms 0.2 ms Within 0.16 div Within 0.16 div

0.1 ms 0.1 ms 0.1 ms Within 0.16 div Within 0.16 div 50 µs 50 µs 50 µs Within 0.16 div Within 0.16 div 20 µs 20 µs 20 µs Within 0.16 div Within 0.16 div 10 µs 10 µs 10 µs Within 0.16 div Within 0.16 div

5 µs5 µs5 µs Within 0.16 div Within 0.16 div 2 µs2 µs2 µs Within 0.16 div Within 0.16 div 1 µs1 µs1 µs Within 0.16 div Within 0.16 div

0.5 µs0.5 µs0.5 µs Within 0.16 div Within 0.16 div

0.2 µs0.2 µs0.2 µs Within 0.16 div Within 0.16 div

0.1 µs0.1 µs0.1 µs Within 0.16 div Within 0.16 div 50 ns 50 ns 50 ns Within 0.16 div Within 0.16 div 20 ns 20 ns 20 ns Within 0.16 div Within 0.16 div 10 ns 10 ns 10 ns Within 0.24 div Within 0.24 div

b. Check-using the settings given in Table 5-2, check sweep accuracy for onetime mark/division over the center eight divisions within the tolerance given in Table 5-2 Set the POSITION control and MAIN TRIGGERING LEVEL control as necessar y for a stable display that is aligned with the vertical graticule lines.

NOTE

If the time-mark generator used does not have 1-2-5 sequence markers, apply 1 unit markers in place of 2 unit markers and check for 2 markers/division over the center eight divisions of display, to the tolerances given in Table 5-2.

c. Push in the DLY’D Time/Division knob and

position the display to the center of the graticule.

d. Check-using the settings given in Table 5-3, check sweep accuracy over the center eight divisions within the tolerance given in Table 5-3.

NOTE

The HF SYNC MODE switch may provide a better display when checking the fastest sweep rates.

5-11

Performance Check/Calibration-7B92A

Table 5-3.

FAST TIMING

TIME/DIV Time-Mark

OR Generator Display Tolerance

DLY TIME Setting Markers/Division (+15°C to +35°C)

5 ns 5 ns 1 Within 0.24 div 2 ns 2 ns 1 Within 0.24 div

B4Check Sweep Linearity

a. Set the TIME/DIV OR DLY TIME and DLY’D Time/Division switch to 1 ms and pull DLY’D Time/Division knob out for Alternate mode.

b.Set the time-mark generator for 1 ms markers. c. Position the Delaying (top) and Delayed-sweep

traces horizontally to start on the first graticule line.

d. Check-that the fourth marker of the Delaying sweep coincides within 0.1 division with the fourth vertical graticule line.

e. Check-continue linearity check, as in part d of this step, for each successive two divisions of the Delaying sweep.

f. Check-repeat parts d and e of this step to

check linearity of the Delayed (bottom) sweep.

g. Set the TIME/DIV OR DLY TIME and DLY’D Time/Division switch to 10 ns and pull DLY’D Time/Division knob out for Alternate mode.

k. Check-continue linearity check for Delayed

sweep rates as shown in Table 5-4.

Table 5-4.

FAST SWEEP LINEARITY

Time-mark

Time/ Generator Markers/ Tolerance/

Division Setting 2 Divisions2 Divisions

5 ns 5 ns 2 0.2 div 2 ns 2 ns 2 0.2 div

B5Check Variable Time/Division Range

a. Remove the 7B92A from the oscillosc ope plug-

in compartment.

b. Place the Time/Division Variable Selector multi-pin connector on P761 (Delaying Sweep). See Fig. 1-1 for location.

h.Set the time-mark generator for 10 ns markers.

i. Check-perform linearity chec k as in parts d, e, and f of this step. Tolerance is 0.1 division for each two divisions over center eight graticule divisions.

j. Set the DLY’D Time/Division to Normal mode (knob in).

c. Insert the 7B92A into the oscilloscope plug-in

compartment; turn on the power to the oscilloscope.

d. Set the time-mark generator for 100 us

markers.

e. Set the TIME/DIV OR DLY TIME and DLY’D Time/Division switch to 20 ,us and pull DLY’D Time/Division knob out for Alternate mode. Check that the DELAY TIME MULT dial is 0.0.

5-12

f. Press and release VARIABLE control and turn

it fully counterclockwise.

g. Check-that Delaying sweep markers (top) and Delayed sweep markers are displayed as shown in Fig. 5-3; at least 2-1/2 Delaying sweep markers to one Delayed sweep marker are visible.

Performance Check/Calibration-7B92A

c. Set the vertical amplifier plug-in unit deflection

factor for approximately two divisions of display.

d. Set the DELAY TIME MULT dial to 0.90. e. Align the time-mark to the center vertical

graticule line, using the POSITION control.

f. Turn the DELAY TIME MULT dial to approximately 8.9 to align the time-mark to the center vertical graticule line.

g. Check-the DELAY TIME MULT dial to read within three minor divisions of 8.90 (8.87 to 8.93).

h. Repeat parts d through g of this step for eac h sweep rate given in Table 5-5. Maintain approximately two divisions of display.

Table 5-5.

DIFFERENTIAL DELAY TIME ACCURACY

Fig. 5-3. Variable Time/Division range.

h. Remove the 7B92A from the oscillosc ope plugin compartment; reposition the Time/Division Variable Selector multi-pin connector to P760 and re-install the 7B92A into the plug-in compartment. Turn on power to the oscilloscope.

i. Check-with VARIABLE control released and turned fully counterclockwise, at least two Delayed sweep markers (bottom) to one Delaying sweep marker is visible.

B6Check Differential Delay Time Accuracy

a. Set the TIME/DIV OR DLY TIME switch to 200 ms, DLY’D Time/Division switch (pull knob out) to 5 ms (then push knob in), push in VARIABLE (CAL IN) control, and adjust MAIN TRIGGERING LEVEL control for a stable display (TRIG’D light on).

b. Set the time-mark generator for 100 ms markers.

Time-mark

TIME/DIV OR DLY’D Generator

DLY TIME Time/Division Setting

.2 s 5 ms 0.1 s

.1 s 2 ms 50 ms 50 ms I ms 10 ms 20 ms 0.5 ms 10 ms 10 ms 0.2 ms 5 ms

5 ms 0.1 ms 1 ms 2 ms 50 µs1 ms

1 ms 20 µs 0.5 ms .5 ms 10 µs 0.1 ms .2 ms 5 µs 0.1 ms .1 ms 2 µs50µs 50 µs1 µs 10 µs 20 µs.5 µs 10 µs 10 µs.2 µs5 µs

5 µs.1 µs1 µs 2 µs 50 ns 1 µs

1 µs 20 ns 0.5 µs .5 µs 10 ns 0.1 µs .2 µs 5 ns 50 ns .1 µs 5 ns 50 ns

5-13

Performance Check/Calibration-7B92A

B7Check Fast Delay Time Accuracy

a. Set the TIME/DIV OR DLY TIME switch to 50 ns, DLY’D Time/Division switch (pull knob out) to 10 ns (then push knob in), and adjust the MAIN TRIGGERING LEVEL control for a stable display (TRIG’D light on).

b. Set the time-mark generator for 50 ns markers.

c. Set the vertical amplifier plug-in unit deflection factor for approximately two divisions of display.

d. Set the DELAY TIME MULT dial to 9.00.

e. Align the leading edge of theti me-mark to the center vertical graticule line, using the POSITION control. See Fig 5-4 for reference.

f. Check-set the DELAY TIME MULT dial to the settings listed in Table 5-6, and check for maximum error in dial reading.

Table 5-6.

FAST DIFFERENTIAL DELAY TIME ACCURACY

DELAY TIME MULT Maximum Error

(Minor Dial Divisions)

9.0 0 (step e)

8.0 Within 3.0

7.0 Within 3.5

6.0 Within 4.0

5.0 Within 4.5

4.0 Within 5.0

3.0 Within 3.0

2.0 Within 6.0

1.0 Within 6.5

g. Set the TIME/DIV OR DLY TIME switch to 20 ns, DLY’D Time/Division switch (pull knob out) to 2 ns (then push knob in), and adjust the MAIN TRIGGERING LEVEL control for a stable display (TRIG’D light on).

h. Set the time-mark generator for 20 ns markers.

i. Repeat parts d, e, and f of this step.

j. Set the TIME/DIV OR DLY TIME switch to 10 ns, DLY’D Time/Division switch (pull knob out) to 2 ns (then push knob in), and adjust the MAIN TRIGGERING LEVEL control for a stable display (TRIG’D light on).

Fig. 5-4. Fast delay time accuracy.

k. Set the time-mark generator for 10 ns markers.

I. Repeat parts d, e, and f of this step. Delete check at DELAY TIME MULT dial setting of 1.0.

B8Check Delay Jitter

a. Set the TIME/DIV OR DLY TIME switch to 1 ms, DLY’D Time/Division switch (pull knob out) to 5 ns (then push knob in), and adjust the MAIN TRIGGERING LEVEL control for a stable display (TRIG’D light on).

5-14

Performance Check/Calibration-7B92A

b. Set the time-mark generator for 1 ms markers.

c. Set the DELAY TIME MULT dial to approximately 1.0 (position the time-mark to the center of the graticule).

d. Set the DLY’D Time/Division switch to 0.2 us.

e. Turn the DELAY TIME MULT dial slowly to position the time-mark near the graticule center (turn un INTENSITY control as necessary).

f. Check-jitter must not exceed one division (disregard slow drift).

g. Set the TIME/DIV OR DLY TIME switch to 20 ps, DLY’D Time/Division switch (pull knob out) to 50 ns ( then push knob in), and adjust the MAIN TRIGGERING LEVEL control for a stable display (TRIG’D light on).

h. Set the time-mark generator for 50 ns markers. i. Set the DLY’D Time/Division switch to 5 ns.

j. Turn the DELAY TIME MULT dial slowly to position the time-mark near the graticule center (turn up INTENSITY control as necessary).

k. Check-jitter must not exceed 0.9 division.

I. Turn the DELAY TIME MULT dial to approximately 9.0 and position the time-mark to the center of the graticule.

m. Check-jitter must not exceed 0.9 division.

This completes the Performance Check procedure of the 7B92A.

5-15

PART II-CALIBRATION

The following procedure returns the 7B92A to corr ect c alibration. All lim its and tolerances given in this procedure are calibration guides and should not be inter preted as instrum ent spec ifications ex cept as specified in the Specification section of this m anual. Where possible, instrum ent performance is checked before an adjus tment is made. When perf orming a complete Calibration proc edure, make each adjustment to the given setting, even if the Check- is within the allowable tolerance.

OUTLINE FOR

PART II--CALIBRATION

A. Trigger Sensitivity (SN B070000-above) Page

1. Preliminary Main Triggering Adjust- 5-18 ment

2. Adjust Main Triggering Internal DC 5-18 Balance

Performance Check/Calibration-7B92A

Page

2. Adjust Main Triggering Arming Tunnel Diode Bias 5-26

3. Adjust Main Triggering Gate Tunnel Diode Bias 5-26

4. Adjust Main Triggering Internal DC Balance 5-26

5. Adjust Main Triggering Sensitivity 5-26

3. Adjust Main Triggering Sensitivity 5-19

4. Adjust External DC Balance 5-19

5. Check Main Triggering Level Range 5-19

6. Preliminary Delayed Triggering Adjustment 5-20

7. Adjust Delayed Triggering Sensitivity 5-20

8. Adjust Delayed Triggering External DC Balance 5-20

9. Check Delayed Triggering Level Range 5-20

10. Check Low-Frequency Triggering 5-21

11. Check AC LF Reject Operation 5-22

12. Check 20 MHz Triggering 5-22

13. Checkl80 MHz Triggering 5-23

14. Check HF Sync Triggering 5-23

15. Check Line Triggering 5-23

6. Adjust Main Triggering External DC Balance 5-26

7. Check Main Triggering Level Range 5-26

8. Preliminary Delayed Triggering Adjustment 5-27

9. Adjust Delayed Triggering Arming Tunnel Diode Bias 5-28

10. Adjust Delayed Triggering Gate Tunnel Diode Bias 5-28

11. Adjust Delayed Triggering Internal DC Balance 5-28

12. Adjust Delayed Triggering Sensitivity 5-28

13. Adjust Delayed Triggering External DC Balance 5-28

14. Check Delayed Triggering Level Range 5-28

15. Check Low-Frequency Triggering 5-28

16. Check AC LF Reject Operation 5-29

17. Check 20 MHz Triggering 5-30

18. Checkl80 MHz Triggering 5-30

16. Check Single Sweep Operation 5-24

B. Trigger Sensitivity (SN B069999-below)

1. Preliminary Main Triggering Adjustment 5-25

19. Check HF Sync Triggering 5-31

20. Check Line Triggering 5-31

21. Check Single Sweep Operation 5-31

5-16

C. Horizontal System Page

1. Set Basic Sweep Calibration 5-33

2. Check Alt Off Function 5-33

Performance Check/Calibration-7B92A

Page

14. Check Variable Time/Division Range 5-38

15. Check Differential Delay Time Accuracy 5-38

3. Adjust DTM Scale and Delay Start 5-33

4. Adjust Delaying Sweep Calibration 5-34

5. Adjust Sweep Registration 5-34

6. Adjust Position Centering 5-34

7. Check Sweep Length 5-34

8. Adjust 2 ns Timing 5-34

9. Adjust Delayed Sweep 20 ns Timing 5-35

10. Adjust Delaying Sweep 20 ns Timing 5-35

11. Adjust Time Position 5-35

12. Check Sweep Timing 5-36

13. Check Sweep Linearity 5-37

16. Check Fast Delay Time Accuracy 5-39

17. Check Delay Jitter 5-40

PRELIMINARY PROCEDURE

1. Install the amplifier plug-in unit in a vertical

compartment of the oscilloscope.

2. Install the 7B92A into a plug-in extender; ins tall the extender into the horizontal compartment of the oscilloscope.

3. Set the oscilloscope vertical mode switch to display the vertical unit and the horizontal mode switch to display the horizontal unit.

4. Set the oscilloscope intensity controls fully counterclockwise, and set the trigger source s witches to vertical mode.

5. Turn on the oscilloscope and allow at least 20 minutes warm up before beginning the procedure.

5-17

A. TRIGGER SENSITIVITY

(For instruments SN B070000-above)

Equipment Required

1. Oscilloscope 6. Time-mark generator

2. Wide-band vertical amplifier plug-in unit 7. Plug-in extender

3. High-frequency signal generator 8. Tee connector, bnc

4. Medium-frequency signal generator 9. 50 Ω cables (2)

5. Low-frequency sine-wave generator

Control Settings

Set the 7B92A controls as follows:

Performance Check/Calibration-7B92A

Vertical Amplifier Plug-In Unit

MAIN TRIGGERING

SLOPE + LEVEL Midrange MODE AUTO COUPLING AC SOURCE INT

Sweep Controls

POSITION Midrange TIME/DIV OR DLY TIME 20 Ps DLY’D Time/Division 10 ps/PULL FOR ALT VARIABLE (CAL IN) In DELAY TIME MULT 1.0

INTENSITY As desired CONTRAST As desired

Delayed Triggering

LEVEL RUNS AFTER

DELAY TIME SLOPE + COUPLING AC SOURCE INT

Position Midrange Polarity + up Input Coupling dc Volts/Division 50 mV

A1. Preliminary Main Triggering Adjustment

a. Connect the bnc tee connector to the input of

the vertical amplifier plug-in unit.

b. Connect a 50-Q cable from the low-frequency

sine-wave generator to the tee connector.

c. Connect a 50- Q cable from the tee connector

to the MAIN TRIG IN connector.

d. Set the oscilloscope intensity and focus

controls for the desired display.

e. Set the low-frequency sine-wave generator for a four-division display at 50 kHz. Center the display vertically on the graticule.

f. Adj ust-Int DC Bal, R75, Ext DC BAL, R99, and Trig Sens, R175, to midrange.

Inputs

TERM 1 MΩ (in)

A2. Adjust Main Triggering Internal DC Balance

a. Set the MAIN TRIGGERING LEVEL control to "O".

5-18

b. Adjust-Int DC Bal, R75, for a sweep trigger point at graticule centerline (TRIG’D light on). See Fig. 5-5 for reference.

A3. Adjust Main Triggering Sensitivity

a. Adjust-Trig Sens, R1 75, for a sweep trigger point at approximately 0.3 division from bottom of waveform as MAIN TRIGGERING LEVEL control is rotated through negative (-) portion of its range. See Fig. 5-6for reference.

NOTE Setting a trigger sensitivity so display is trigger ed at less than 0. 1 division should be avoided to prevent erratic triggering.

b. Reset the MAIN TRIGGERING LEVEL c ontrol

to "0".

A4. Adjust External DC Balance

a. Set the MAIN TRIGGERING SOURCE to EXT.

Performance Check/Calibration-7B92A

Fig. 5-6. Trigger sensitivity (Circle correct trigger point).

b. Adjust-Ext DC Bal, R99, for a sweep trigger point at graticule centerline (TRIG’D light on). See Fig. 5-5 for reference.

c. Set the MAIN TRIGGERING SOURCE to INT.

A5. Check Main Triggering Level Range

a. Set the vertical amplifier plug-in unit volts/division switch to 1 V.

Fig. 5-7. Main Triggering level range (Circle denotes triggering limits).

Fig. 5-5. DC balance (Circle denotes correct trigger point)

5-19

Performance Check/Calibration-7B92A

b. Set the low-frequency sine-wave generator for an eight-division display at 50 kHz. Center the display vertically on the graticule.

c. Chec k-that all levels of the positive slope may be selected for the sweep starting point as the MAIN TRIGGERING LEVEL control is rotated throughout its range, and that triggering occurs at least 3.5 divisions above and below the center horizontal graticule line. See Fig. 5-7 for reference.

d. Check-set the MAIN TRIGGERING SLOPE to and repeat part c for the negative slope of the waveform.

e. Check-set the MAIN TRIGGERING SOURCE to EXT and repeat part c of this step.

f. Check -set the MAIN TRIGGERING SLOPE to + and repeat part c for the positive slope of the waveform.

A6. Preliminary Delayed Triggering Adjustment

a. Disconnect the 50-n cable from the MAIN TRIG IN connector and reconnect it to the DLY’D TRIG IN connector.

b. Set the 7B92A controls as follows:

MAIN TRIGGERING INT

SOURCE

MAIN TRIGGERING Near "0"

LEVEL

Delayed Triggering +

SLOPE

Delayed Triggering AC

COUPLING

Delayed Triggering INT

SOURCE

Delayed Triggering "0"

LEVEL DELAY TIME MULT 1.0 TIME/DIV OR DELAY 20 µs

TIME DLY’D Time/Division 10 ps/PULL FOR

ALT

c. Adjust Ext DC Bal, R230, Int DC Bal, R255,

and Trig Sens, R320, to midrange.

d. Set the vertical amplifier plug-in unit

volts/division switch to 50 mV.

e. Set the low-frequency sine-wave generator for a four-division display at 50 kHz. Center the display vertically on the graticule.

f. Adjust-Int DC Bal, R255, for a sweep trigger point at graticule centerline (TRIG’D light on). See Fig. 5-5 for reference.

A7. Adjust Delayed Triggering Sensitivity

a. Adjust-Trig Sens, R320, for a sweeptrigger point at approximately 0.3 division from bottom of waveform as Delayed Triggering LEVEL control is rotated through negative (-) portion of its range. See Fig. 5-6 for reference.

NOTE Setting trigger sensitivity so display is triggered at less than 0. 1 division s hould be avoided to prevent erratic triggering.

b. Reset the Delayed Triggering LEVEL control to

"0"

A8. Adjust Delayed Triggering External DC Balance

a. Set Delayed Triggering SOURCE to EXT.

b. Adjust-Ext DC Bal, R230, for a sweep trigger point at graticule centerline (TRIG’D light on). See Fig. 5-5 for reference.

c. Set the Delayed Triggering SOURCE to INT.

A9. Check Delayed Triggering Level Range

a. Set the vertical amplifier plug-in unit volts/divisior switch to 1 V.

b. Set the low-frequency sine-wave generator for ar eight-division display at 50 kHz. Center the display vertically on the graticule. (Lower the Delaying sweep intensity with the oscilloscope intensity control.)

c. Chec k-that all levels of the positive slope of the intensified zone may be selected for the sweep starting point as the Delayed Triggering LEVEL control is rotated throughout its range, and that triggering occurs at least

3.5 divisions above and below the center horizontal graticule line. See Fig. 5-8 for reference.

5-20

Performance Check/Calibration-7B92A

Delayed Triggering +

SLOPE

Delayed Triggering AC

COUPLING

Delayed Triggering INT

SOURCE Delayed Triggering RUNS AFTER LEVEL DELAY TIME TIME/DIV OR DLY TIME 10 ms DLY’D Time/Division 2 ms/PULL FOR ALT DELAY TIME MULT 1.0

c. Set the vertical amplifier plug-in unit

volts/division switch to 0.2 V.

d. Set the low-frequency sine-wave generator for

a 0.5 division (100 millivolts) display at 30 Hz.

e. Check-for a stable dis play (TRIG’D light on) at

all settings of the MAIN TRIGGERING LEVEL control with MAIN TRIGGERING COUPLING set to:

(1.) AC (2.) AC HF REJ (3.) DC

Fig. 5-8. Delayed Triggering level range. (circle denotes triggering limits.)

d. Check-set the Delayed Triggering SLOPE to-

and repeat part c for the negative slope of the waveform.

e. Check-set the Delayed Triggering SOURCE to

EXT and repeat part c of this step.

f. Check -set the Delayed Triggering SLOPE to +

and repeat part c for the positive slope of the waveform.

A10.Check Low-Frequency Triggering

a. Disconnect the 50-) cable from the DLY’D TRIG IN connector and reconnect it to the MAIN TRIG IN connector.

b. Set the 7B92A controls as follows:

MAIN TRIGGERING AC

COUPLING

(Set the MAIN TRIGGERING LEVEL control as necessary.)

f. Check-set the MAIN TRIGGERING SOURCE

to EXT and repeat part e of this step.

g. Disconnect the 50-4 cable from the MAIN TRIG IN connector and reconnect it to the DLY’D TRIG IN connector.

h. Set the control settings as follows:

MAIN TRIGGERING INT

SOURCE

Delayed Triggering near "0"

LEVEL

Delayed Triggering EXT

SOURCE

i. Check-for a s table display (TRIG’D light on) at all settings of LEVEL controls with Delayed Triggering COUPLING set to:

(1.) AC

(2) DC (Set the MAIN and Delayed Triggering LEVEL controls as necessary.)

5-21

Performance Check/Calibration-7B92A

j. Check-set the Delayed Triggering SOURCE to

INT and repeat part i of this step. A11. Check AC LF Reject Operation

a. Disconnect the 50-C cable from the DLY’D TRIG IN connector and reconnect it to the MAIN TRIG IN connector.

b. Set the vertical amplifier plug-in unit volts/division switch to 0.5 V.

c. Set the low-f requency sine-wave generator for an eight-division display at 60 Hz. Center the display vertically on the graticule.

d. Check-set the MAIN TRIGGERING LEVEL control for a stable display (TRIG’D light on).

e. Set the MAIN TRIGGERING COUPLING to AC LF REJ; set the MODE to NORM.

f. Check-for no display (TRIG’D light off) when the MAIN TRIGGERING LEVEL control is rotated throughout its range.

g. Set the MAIN TRIGGERING COUPLING to AC; set the SOURCE to EXT.

h. Reduce the output of the low-frequency sinewave generator to provide a six-division display (3.0 V) at 60 Hz. (Adjust the MAIN TRIGGERING LEVEL control to maintain a stable display.)

i. Set the MAIN TRIGGERING COUPLING to AC LF REJ and repeat part f of this step.

A12. Check 20 MHz Triggering

a. Set the vertical amplifier plug-in unit volts/division switch to 0.2 V.

SOURCE

Delayed Triggering All pushbuttons in

COUPLING, SOURCE and SLOPE

Delayed Triggering RUNS AFTER

LEVEL DELAY TIME TIME/DIV OR DLY TIME 50 ns DLY’D Time/Division 5 ns/PULL FOR ALT

c. Disconnect the 50-Q cable from the low-

frequency sine-wave generator and connect the mediumfrequency signal generator to the vertical amplifier plugin unit input using the 50-n cable.

d. Set the medium-frequency signal generator for

a 0.5 division display (100 mV) at 20 MHz.

e. Check-for a stable display (TRIG’D light on)

with the MAIN TRIGGERING COUPLING switch set to:

(1) AC (2) AC LF REJ (3) DC

(Set the MAIN TRIGGERING LEVEL control as necessary.)

f. Check-change the MAIN TRIGGERING

SOURCE to EXT and repeat part e of this step.

g. Disconnect the 50-C cable from the MAIN

TRIG IN connector and reconnect it to the DLY’D TRIG IN connector.

h. Set the Delayed Triggering LEVEL control near

"0".

i. Set the MAIN TRIGGERING SOURCE to INT

and MAIN TRIGGERING COUPLING to AC.

j. Check-for a stable display (TRIG’D light on)

with the Delayed Triggering COUPLING switch set to:

(1) AC (2) DC

b. Set the 7B92A controls as follows: MAIN TRIGGERING AC

COUPLING

MAIN TRIGGERING AUTO

MODE

MAIN TRIGGERING INT

k. Set the Delayed Triggering SOURCE to EXT

and repeat part j of this step.

I. Disconnect the 50-C cable from the medium-

frequency signal generator; disconnect the 50-C cable from the bnc tee at the vertical amplifier plug-in input connector.

5-22

Performance Check/Calibration-7B92A

A-13. Check 180 MHz Triggering

a. Connect the high-frequency leveled sine-wave generator to the bnctee connected to the vertical amplifier plug-in unit input.

b. Disconnect the 50-n cable from the DLY’D TRIG IN connector and reconnect it to the MAIN TRIG IN connector.

c. Set the 7B92A controls as follows:

MAIN TRIGGERING DC

COUPLING

MAIN TRIGGERING EXT

SOURCE TIME/DIV OR DLY TIME 1 ns DLY’D Time/Division 1 ns (knob in)

d. Adjust the oscilloscope intensity control for

normal viewing.

e. Set the vertical amplifier plug-in unit

volts/division switch to 0.5 V.

f. Set the high-frequency leveled sinewave

generator for a one-division display at 180 MHz. Center the display vertically on the graticule.

g. Set the MAIN TRIGGERING LEVEL control for

a stable display (TRIG’D light on).

h. Check-for a stable display with no more than

0.05 division of jitter. i. Check-change the MAIN TRIGGERING

SOURCE to INT and repeat parts g and h of this step.

j. Disconnect the 50-Ω cable from the MAIN

TRIG IN connector and reconnect it to the DLY’D TRIG IN connector.

k. Set the DLY’D Time/Division to PULL FOR

ALT; set the Delayed Triggering SOURCE to EXT.

I. Set the Delayed Triggering LEVEL control for a

stable display (near "0").

m. Check-for a stable display with no more than

0.05 division of jitter. n. Check-change Delayed Triggering SOURCE to

INT and repeat m of this step.

A14. Check HF Sync Triggering

a. Disconnect the 50-n cable from the DLY’D

TRIG IN connector and reconnect it to the MAIN TRIG IN connector.

b. Set the Delayed Triggering LEVEL control to

RUNS AFTER DELAY TIME.

c. Set the DLY’D Time/Division switch to Normal

mode (knob in).

d. Set the MAIN TRIGGERING MODE to HF

SYNC.

e. Set the vertical amplifier plug-in unit

volts/division switch to 1 V.

f. Set the MAIN TRIGGERING LEVEL control for

a stable display (TRIG’D light on).

g. Check-for a stable display with no more than

0.05 division of jitter. h. Set the high-frequency leveled sine-wave

generator for a one-division display.

I. Check-change the MAIN TRIGGERING

SOURCE to EXT + 10 and repeat part g of this step.

j. Disconnect the 50-n cable from the high-

frequency leveled sine-wave generator.

A15. Check Line Triggering

a. Disconnect the 50-Ω cable from the MAIN

TRIG IN connector.

b. Set the MAIN TRIGGERING MODE to AUTO,

SOURCE to LINE, and COUPLING to AC; the TIME/DIV OR DLY TIME switch to 1 ms; and DLY’D Ti me/Division to 1 ms (knob in).

5-23

c. Check-set the MAIN TRIGGERING LEVEL

control near "0" and check that the TRIG’D light is on.

d. Check-that the display is not triggered (TRIG’D light off) at either end of the MAIN T RIGGERING LEVEL control rotation.

A16 Check Single Sweep Operation

Performance Check/Calibration-7B92A

e. Check-change the MAIN TRIGGERING SOURCE to INT and observe that only one sweep is displayed and SINGLE SWEEP RESET pushbutton goes out.

f. Set the TIME/DIV OR DLY TIME switch to Alternate mode (PULL FOR ALT).

a. Connect the time-mark generator to the input of the vertical amplifier plug-in unit, using a 50-Ω cable; set the generator for 1 ms markers.

b. Set the vertical amplifier plug- in unit deflection factor for approximately two divisions of display; and adjust MAIN TRIGGERING LEVEL control for a stable display.

c. Set the MAIN TRIGGERING SOURCE to INT, MODE to SINGLE SWEEP, and SOURCE to EXT.

d. Press the SINGLE SWEEP RESET pushbutton; it should be lit.

g. Set the MAIN TRIGGERING SOURCEto EXT; press the SINGLE SWEEP RESET pushbutton. The pushbutton should be lit.

h. Check-change the MAIN TRIGGERING SOURCE to INT and observe that only one sweep is displayed and SINGLE SWEEP RESET pushbutton goes out.

i. Press SINGLE SWEEP RESET pushbutton several times and observe that display alternates between Delaying and Delayed sweeps.

5-24

B. TRIGGER SENSITIVITY

(For instruments SN B069999-below)

Equipment Required

1. Oscilloscope 6. Time-mark generator

2. Wide-band vertical amplifier plug-in unit 7. Digital voltmeter

3. High-frequency signal generator 8. Plug-in extender

4. Medium-frequency signal generator 9. Tee connector, bnc

5. Low-frequency sine-wave generator 10. 50-Ω cable (2)

Performance Check/Calibration-7B92A

Control Settings

Set the 7B92A controls as follows:

MAIN TRIGGERING

SLOPE + LEVEL Midrange MODE AUTO COUPLING AC SOURCE INT

Sweep Controls

POSITION Midrange TIME/DIV OR DLY TIME 20µs DLY’D Time/Division 10 µs/PULL FOR

ALT VARIABLE (CAL IN) In DELAY TIME MULT 1.0 INTENSITY As desired CONTRAST As desired

Delayed Triggering

LEVEL RUNS AFTER

DELAY TIME SLOPE + COUPLING AC SOURCE INT

Inputs

TERM 1 MΩ (in)

Vertical Amplifier Plug-In Unit

Position Midrange Polarity + up Input Coupling dc Volts/Division 50 mV

B1. Preliminary Main Triggering Adjustment

a. Connect the bnc tee connector to the input of

the vertical amplifier plug-in unit.

b. Connect a 50-Ω cable from the low-f requency

sine-wave generator to the tee connector.

c. Connect a 50-Ω cable from the tee c onnector

to the 7B92A MAIN TRIG IN connector.

d. Set the oscilloscope intensity and focus

controls for the desired display.

e. Set the low-frequency sine-wave generator for a four-division display at 50 kHz (200 mV). Center the display vertically on the graticule.

f. Adj ust-Int DC Bal, R25, Ext DC Bal, R59, and Trig Sens, R125, to midrange.

g. Adjust-Arming TD Bias, R145, and Gate TD Bias, R155, fully clockwise. The T RIG’D light should be on and the displayed waveform should be unstable.

5-25

h. Adjust-Gate TD Bias, R155, counterclockwise until a stable display occurs, then clock wise until display is unstable.

i. Connect the digital voltmeter between TP145 and chassis ground.

B2. Adjust Main Triggering Arming Tunnel Diode Bias

a. Adjust-Arming TD Bias, R145, counterclockwise until a stable display just occurs. Record the voltage at TP145; continue counterclock wise adjustment of R145 until TRIG’D light just goes out. Record the voltage at TP1 45.

b. Adjust-Arming T D Bias, R145, for the average of the two recorded voltage readings; disconnect the digital voltmeter.

Performance Check/Calibration-7B92A

Fig. 5-9. DC balance. (Circle denotes correct trigger point.)

B5. Adjust Main Triggering Sensitivity

B3. Adjust Main Triggering Gate Tunnel Diode Bias

a. Disconnect the delay line cable at connector J170.

b. Connect the digital voltmeter between TP155 and chassis ground.

c. If TRIG’D light is on and waveform display is stable, adjust Gate TD Bias, R155, counterclockwise until TRIG’D light just goes out.

d. Record the voltage at TP155.

e. Adjust-Gate TD Bias, R155, until TRIG’D light just goes out; then clockwise until waveform display is stable. Record the voltage at TP155.

f. Adj ust-Gate TD Bias, R155, for the average of the two recorded voltage readings obtained in parts d and e of this step; disconnect the digital voltmeter.

B4. Adjust Main Triggering Internal DC Balance

a. Set the MAIN TRIGGERING COUPLING to AC; set the LEVEL control to "0".

a. Adjust-Trig Sens, R125, for a sweep trigger point at approximately 0.5 division from bottom of waveform as MAIN TRIGGERING LEVEL control is rotated through negative (-) portion of its range. See Fig. 5-10 for reference.

B6. Adjust Main Triggering External DC Balance

a. Set the MAIN TRIGGERING SOURCE to EXT.

b. Adjust-Ext DC Bal, R59, for a sweep trigger point at graticule centerline. See Fig. 5-9 for reference.

B7. Check Main Triggering Level Range

a. Set MAIN TRIGGERING SOURCE to EXT.

b. Adjust-Int DC Bal, R25, for a stable crt display at graticule centerline (TRIG’D light on). See Fig. 5-9 for reference.

Fig. 5-10. Trigger sensitivity (Circle denotes correct point)

5-26

Performance Check/Calibration-7B92A

b. Set the vertical amplifier plug-in unit volts/division switch to 1 V.

c. Set the low-f requency sine-wave generator for an eight-division display at 50 kHz. Center the display vertically on the graticule.

d. Check-that all levels of the pos itive slope may be selected for the sweep starting point as the MAIN TRIGGERING LEVEL control is rotated throughout its range, and that triggering occurs at least 3.5 divisions above and below the center horizontal graticule line. See Fig. 5-11 for reference.

e. Check-set the MAIN TRIGGERING SLOPE to and repeat part d for the negative slope of the waveform. Performance Check/Calibration-7B92A

f. Check-set the MAIN TRIGGERING SOURCE

to EXT and repeat part d of this step.

g. Check-set the MAIN TRIGGERING SLOPE to + and repeat part d for the positive slope of the waveform.

B8. Preliminary Delayed Triggered Adjustment

a. Disconnect the 50-Ω cable from the MAIN TRIG IN connector and reconnect it to the DLY’D TRIG IN connector.

b. Set the 7B92A controls as follows:

MAIN TRIGGERING INT

SOURCE

MAIN TRIGGERING Near "O"

LEVEL

Delayed Triggering +

SLOPE

Delayed Triggering AC

COUPLING

Delayed Triggering INT

SOURCE

Delayed Triggering "O"

LEVEL DELAY TIME MULT 1.0 TIME/DIV OR DLY TIME 20 µs

DLY’D Time/Division 10, µs PULL FOR

ALT

Fig. 5-11. Main Triggering level range. (Circle denotes

triggering limits.)

c. Adjust-Ext DC Bal, R225, Int DC Bal, R245,

and Trig Sens, R325, to midrange.

d. Adjust-Arming TD Bias, R345, and Gate TD

Bias, R355, fully clockwise.

e. Set the vertical amplifier plug-in unit

volts/division switch to 50 mV.

f. Set the low-f requency sine-wave generator for

a four-division display at 50 kHz. Center the display vertically on the graticule.

NOTE Intensified zone should start at the beginning of Delaying (top) sweep.

g. Adjust-Gate TD Bias, R355, counterclockwise

until intensified zone moves to right and disappears.

5-27

Performance Check/Calibration-7B92A

h. Connect the digital voltmeter between TP345

and chassis ground.

B9. Adjust Delayed Triggering Arming Tunnel Diode Bias

a. Adjust-Arming TD Bias, R345, counterclockwise until Delayed sweep starts again. Record the voltage at TP345. Continue counterclockwise rotation of R345 until Delayed sweep again disappears. Record the voltage at TP345.

b. Adjust-Arming T D Bias, R345, for the average of the two voltage readings recorded in part a of this step. Delayed sweep should be visible.

B10. Adjust Delayed Triggering Gate Tunnel Diode Bias

a. Disconnect the digital voltmeter from TP345 and connect it to TP355; record the voltage.

b. Adjust-Gate Bias, R355, counterclock wise until Delayed sweep disappears. Record the voltage at TP355.

c. Adjus t-Gate Bias, R355, for the average of the two voltage readings recorded in parts a and b of this step.

B11. Adjust Delayed Triggering Internal DC Balance

a. Set Delayed Triggering LEVEL control to "0".

b. Adjust-Int DC Bal, R245, for a Delayed sweep trigger point at graticule centerline. See Fig. 5-9 for reference.

B13. Adjust Delayed Triggering External DC Balance

a. Set Delayed Triggering SOURCE to EXT.

b. Adjust-Ext DC Bal, R225, for a Delayed sweep trigger point at graticule centerline. See Fig. 5-9 for reference.

B14. Check Delayed Triggering Level Range

a. Set the Delayed Triggering SOURCE to INT.

b. Set the vertical amplifier plug-in unit volts/division switch to 1 V.

c. Set the low-f requency sine-wave generator for an eight-division display at 50 kHz. Center the display vertically on the graticule. (Lower the Delaying sweep intensity control.)

d. Check-that all levels of the pos itive s lope of the intensified zone may be selected for the sweep starting point as the Delayed Triggering LEVEL control is rotated throughout its range, and that triggering occurs at least

3.5 divisions above and below the center horizontal graticule line. See Fig. 5-12 for reference.

e. Check-set the Delayed Triggering SLOPEtoand repeat part d for the negative slope of the waveform.

f. Check-set the Delayed Triggering SOURCEto EXT and repeat part d of this step.

g. Check-set the Delayed Triggering SLOPE to + and repeat part d for the positive slope of the waveform.

B15. Check Low-Frequency Triggering

B12. Adjust Delayed Triggering Sensitivity

a. Adjust-Trig Sens, R325, for a Delayed sweep trigger point at approximately 0.5 division from bottom of waveform as Delayed Triggering LEVEL control is rotated through negative (-) portion of its range. See Fig. 5-10 for reference.

NOTE Setting trigger sensitivity so display is triggered at less than 0. 1 division should be avoided to prevent erratic triggering.

a. Disconnect the 50-Ω cable from the DLY’D TRIG IN connector and reconnect it to the MAIN TRIG IN connector.

b. Set the 7B92A controls as follows:

MAIN TRIGGERING AC

COUPLING

Delayed Triggering +

SLOPE

Delayed Triggering AC

COUPLING

5-28

Performance Check/Calibration-7B92A

(2)AC HF REJ

(3)DC (Set the MAIN TRIGGERING LEVEL control as necessary.)

f. Check-set the MAIN TRIGGERING SOURCE to EXT and repeat part e of this step.

g. Disconnect the 50-Ω cable from the MAIN TRIG IN connector and reconnect it to the DLY’D TRIG IN connector.

h. Set the control settings as follows:

MAIN TRIGGERING INT

SOURCE

Delayed Triggering near "0"

LEVEL

Delayed Triggering EXT

SOURCE

i. Check-for a stable display (TRIG’D light on) at all settings of LEVEL controls with Delayed Triggering COUPLING set to:

(1)AC

(2)DC (Set the MAIN and Delayed Triggering LEVEL controls as necessary.)

Fig. 5-12. Delayed Triggering level range. (Circle denotes triggering limits.)

Delayed Triggering INT

SOURCE

Delayed Triggering RUNS AFTER

LEVEL DELAY TIME TIME/DIV OR DLY TIME 10 ms DLY’D Time/Division 2 ms/PULL FOR ALT DELAY TIME MULT 1.0

c. Set the vertical amplifier plug-in unit

volts/division switch to 0.2 V.

d. Set the low-frequency sine-wave generator for

a 0.5 division (100 millivolts) display at 30 Hz.

e. Check-for a stable display (TRIG’D light on) at all settings of the MAIN TRIGGERING LEVEL control with MAIN TRIGGERING COUPLING set to:

(1)AC

j. Check-set the Delayed Triggering SOURCE to

INT and repeat part i of this step.

B16. Check AC LF Reject Operation

a. Disconnect the 50-Ω cable from the DLY’D TRIG IN connector and reconnect it to the MAIN TRIG IN connector.

b. Set the vertical amplifier plug-in unit volts/division switch to 0.5 V.

c. Set the low-frequency sine-wave generator for an eight-division display at 60 Hz. Center the display vertically on the graticule.

d. Check-set the MAIN TRIGGERING LEVEL control for a stable display (TRIG’D light on).

5-29

Performance Check/Calibration-7B92A

e. Set the MAIN TRIGGERING COUPLING to AC

LF REJ; set the MODE to NORM.

f. Check-for no display (TRIG’D light off) when the MAIN TRIGGERING LEVEL control is rotated throughout its range.

g. Set the MAIN TRIGGERING COUPLING to AC; set the SOURCE to EXT.

h. Reduce the output of the low-frequency sinewave generator to provide a six-division display (3.0 V) at 60 Hz. (Adjust the MAIN TRIGGERING LEVEL control to maintain a stable display.)

i. Set the MAIN TRIGGERING COUPLING to AC LF REJ and repeat part f of this step.

B17. Check 20 MHz Triggering

a. Set the vertical amplifier plug-in unit volts/division switch to 0.2 V.

b. Set the 7B92A controls as follows:

MAIN TRIGGERING AC

COUPLING

MAIN TRIGGERING AUTO

MODE

MAIN TRIGGERING INT

SOURCE

Delayed Triggering All pushbuttons in

COUPLING, SOURCE

and SLOPE Delayed Triggering RUNS AFTER LEVEL DELAY TIME TIME/DIV OR DLY TIME 50 ns DLY’D Time/Division 5 ns/PULL FOR ALT

c. Disconnect the 50-Ω cable from the low-

frequency sine-wave generator and connect the mediumfrequency signal generator to the vertical amplifier plugin unit input using the 50-Ω cable.

e. Check-for a stable display (TRIG’D light on)

with the MAIN TRIGGERING COUPLING switch set to:

(1)AC (2)AC LF REJ

(3)DC (Set the MAIN TRIGGERING LEVEL control as necessary.)

f. Check-change the MAIN TRIGGERING SOURCE to EXT and repeat part e of this step.

g. Disconnect the 50-Ω cable from the MAIN TRIG IN connector and reconnect it to the DLY’D TRIG IN connector.

h. Set the Delayed Triggering LEVEL control near "0".

i. Set the MAIN TRIGGERING SOURCE to INT and MAIN TRIGGERING COUPLING to AC.

j. Check-for a stable display (TRIG’D light on) with the Delayed Triggering COUPLING switch set to:

(1)AC

(2)DC

k. Set the Delayed Triggering SOURCE to EXT and repeat part j of this step.

I. Disconnect the 50-Ω cable from the mediumfrequency signal generator; disconnect the 50-n cable from the bnc tee at the vertical amplifier plug-in input connector.

B18. Check 180 MHZ Triggering

a. Connect the high-frequency leveled sine-wave generator to the bnc tee connected tothe vertical amplifier plug-in unit input.

b. Disconnect the 50-Ω cable from the DLY’D TRIG IN connector and reconnect it to the MAIN TRIG IN connector.

d. Set the medi um-frequency signal generator for

a 0.5 division display (100 mV) at 20 MHz.

c. Set the 7B92A controls as follows:

MAIN TRIGGERING DC

COUPLING

MAIN TRIGGERING EXT

SOURCE TIME/DIV OR DLY TIME 2 ns DLY’D Time/Division 2 ns (knob in)

5-30

Performance Check/Calibration-7B92A

d. Adjust the oscilloscope intensity control for

normal viewing.

e. Set the vertical amplifier plug-in unit

volts/division switch to 0.5 V.

f. Set the high frequency leveled sine-wave generator for a one-division display at 180 MHz. Center the display vertically on the graticule.

g. Set the MAIN TRIGGERING LEVEL control for a stable display (TRIG’D light on).

h. Check-for a stable display with no more than

0.05 division of jitter.

i. Check-change the MAIN TRIGGERING SOURCE to INT and repeat parts g and h of this step.

j. Disconnect the 50-Ω cable from the MAIN TRIG IN connector and reconnect it to the DLY’D TRIG IN connector.

k. Set the DLY’D Time/Division to PULL FOR ALT; set the Delayed Triggering SOURCE to EXT.

I. Set the Delayed Triggering LEVEL control for a stable display (near "0").

m. Check-for a stable display with no more than

0.05 division of jitter.

n. Check-change Delayed Triggering SOURCE to INT and repeat m of this step.

e. Set the vertical amplifier plug-in unit

volts/division switch to 1 V.

f. Set the MAIN TRIGGERING LEVEL control for

a stable display (TRIG’D light on).

g. Check-for a stable display with no more than

0.05 division of jitter. h. Set the high-frequency leveled sine-wave

generator for a one-division display.

i. Check-change the MAIN TRIGGERING

SOURCE to EXT . 10 and repeat part g of this step.

j. Disconnect the 50-Ω cable from the high-

frequency leveled sine-wave generator.

B20. Check Line Triggering

a. Disconnect the 50-Ω cable from the MAIN

TRIG IN connector.

b. Set the MAIN TRIGGERING MODE to AUTO,

SOURCE to LINE, and COUPLING to AC; the TIME/DIV OR DLY TIME switch to l ms; and DLY’D Time/Division to 1 ms (knob in).

c. Check-set the MAIN TRIGGERING LEVEL

control near "0" and check that the TRIG’D light is on.

d. Check-that the display is not triggered (TRIG’D

light off) at either end of the MAIN TRIGGERING LEVEL control rotation.

B19. Check HF Sync Triggering

a. Disconnect the 50-Ω cable from the DLY’D TRIG IN connector and reconnect it to the MAIN TRIG IN connector.

b. Set the Delayed Triggering LEVEL control to RUNS AFTER DELAY TIME.

c. Set the DLY’D Time/Division switch to Normal mode (knob in).

d. Set the MAIN TRIGGERING MODE to HF SYNC.

B21. Check Single Sweep Operation

a. Connect the time-mark generator to the input of the vertical amplifier plug-in unit, using a 50-Ω cable; set the generator for 1 ms markers.

b. Set the vertical amplifier plug-in unit deflection factor for approximately two divisions of display; and adjust MAIN TRIGGERING LEVEL control for a stable display.

5-31

Performance Check/Calibration-7B92A

c. Set the MAIN TRIGGERING SOURCE to INT,

MODE to SINGLE SWEEP, and SOURCE to EXT.

d. Press the SINGLE SWEEP RESET

pushbutton; it should be lit.

e. Check-change the MAIN TRIGGERING SOURCE to INT and observe that only one sweep is displayed and SINGLE SWEEP RESET pushbutton goes out.

f. Set the TIME/DIV OR DLY TIME switch to Alternate mode (PULL FOR ALT).

g. Set the MAIN TRIGGERING SOURCEto EXT; press the SINGLE SWEEP RESET pushbutton. The pushbutton should be lit.

h. Check-change the MAIN TRIGGERING SOURCE to INT and observe that only one sweep is displayed and SINGLE SWEEP RESET pushbutton goes out.

i. Press SINGLE SWEEP RESET pushbutton several times and observe that display alternates between Delaying and Delayed sweeps.

5-32

C. HORIZONTAL SYSTEM

Equipment Required

1. Oscilloscope 5. 50-Ω termination

2. Wide-band Vertical amplifier plug-in unit 6. 50-Ω cable

3. Time-mark generator 7. Screwdriver

4. Calibration generator

Performance Check/Calibration-7B92A

C1. Set Basic Sweep Calibration

a. Set the 7B92A controls as follows:

MAIN TRIGGERING

SLOPE + LEVEL Midrange MODE NORM COUPLING AC SOURCE INT

Sweep Controls

POSITION Midrange TIME/DIV OR DLY TIME 1 ms DLY’D Time/Division 1 ms (knob in)

Delayed Triggering

LEVEL RUNS AFTER

DELAY TIME SLOPE + COUPLING AC SOURCE INT

Inputs

TERM 1 MΩ (pushbutton in)

b. Connect the time-mark generator to the vertical amplifier plug-in unit input with a 50-Ω cable. Set the time-mark generator for 1 ms markers.

d. Set the vertical amplifier plug-in unit for approximately two divisions of display. Position the display in the center graticule area. Set the MAIN TRIGGERING LEVEL control for a stable display (TRIG’D light on).

e. Set the front-panel SWP CAL adjustment for one marker/division over the center eight divisions (position as necessary).

C2. Check Alt Off Function

a. Check-for Delaying sweep (with intensified zone) positioned at least 3.5 divisions above Delayed sweep.

c. Check-that Delaying sweep (with intensified zone) is not alternating with Delayed sweep, and no readout exists.

C3. Adjust DTM Scale and Delay Start

c. Set the oscilloscope intensity and focus

controls for a desired display.

a. Set the DLY’D Time/Division switch to 10 /s; set the TRACE SEP control fully clockwise.

5-33

b. Set the DELAY TIME MULT dial to 9.00.

c. Position the first time-mark to the second vertical graticule line, using the POSITION control. See Fig. 5-13 for reference.

d. Adjust-DTM Scale, R495, to start ris ing portion of tenth time-mark so Delayed (bottom) sweep display coincides with second vertical gratic ule line. See Fig. 513 for reference.

e. Set the DELAY TIME MULT dial to 1.00.

f. Adj ust-Delay Start, R425, to start rising por tion of second time-mark so Delayed (bottom) sweep display coincides with second vertical gratic ule line. See Fig. 513 for reference.

g. Interaction-repeat the adjustm ent of R495 and R425 as necessary.

Performance Check/Calibration-7B92A

b. Adjust-Sweep Registration, R525, to align first time-mark of Delayed sweep with first time-mark of Delaying sweep.

c. Interac tion-repeat the adjustment of R458 and R525 as necessary.

C6. Adjust Position Centering

a. Set the time-mark generator for 2 ms markers.

b. Set the POSITION control fully counterclockwise.

c. Adjust-Position Centering, R935, to align the second time-mark with the left (first) vertical graticule line.

d. Set the POSITION control fully clockwise.

e. Check-that the sweeps start to the right of graticule center.

C7. Check Sweep Length

Fig. 5-13. Correct DTM Scale and Delay Start

adjustment (circle).

C-4. Adjust Delaying Sweep Calibration

a. Set TIME/DIV OR DLY TIME and DLY’D Time/Division switch to 1 ms, and pull DLY’D Time/Division knob out for alternate mode.

b. Adjust-Delaying Sweep Cal, R458, for one time-mark per division over center eight graticule divisions.

C-5. Adjust Sweep Registration

a. Set DELAY TIME MULT dial to 0.0.

a. Set the time-mark generator for 1 ms markers. b. Check-both Delaying and Delayed sweeps

must be 10.5 divisions, within 0.3 division.

C8. Adjust 2 ns Timing

a. Set the TIME/DIV OR DLY TIME and DLY’D

Time/Division switch to 2 ns (knob pushed in).

b. Set the time-mark generator for 2 ns markers. c. Set the vert ical amplifier plug-in unit def lection

factor for a two-division display.

d. Adjust the MAIN TRIGGERING LEVEL control

for a stable display (TRIG’D light on).

e. Align the second time-mark to the second

vertical graticule line, using the POSITION control.

f. Check-that the tenth time-mark is within 0.32

division of tenth vertical graticule line.

5-34

Performance Check/Calibration-7B92A

g. Adjust-2 ns Timing, C540, for one time-mark per division over center eight graticule divisions.

C9. Adjust Delayed Sweep 20 ns Timing

a. Set TIME/DIV OR DLY TIME and DLY’D Time/Division switch to 20 ns (knob pushed in).

b. Set the time-mark generator for 20 ns markers.

c. Set the vert ical amplifier plug-in unit def lection factor for a two-division display.

d. Adjust the MAIN TRIGGERING LEVEL control for a stable display (TRIG’D light on).

e. Align the second time-mark to the second vertical graticule line, using the POSITION control.

f. Check-that the tenth time-mark is within 0.16 division of tenth vertical graticule line.

g. Adjust-20 ns Timing, C721, for one tim e-mark per division over center eight graticule divisions.

C10. Adjust Delaying Sweep 20 ns Timing

a. Set the TIME/DIV OR DLY TIME and DLY’D Time/Division switch to 2 ns, and pull DLY’D Time/Division knob out.

h. Adjust-20 ns Timing, C440, to position the leading edge of the time-mark at the intersection of horizontal and vertical graticule centerlines.

i. Set the DELAY TIME MULT dial to 3.00.

j. Repeat part f of this step.

k. Interac tion-repeat parts f through i of this step as necessary.

I. Disconnect the 50-n cable from the time-mark generator.

C11. Adjust Time Position

a. Connect a 50-Ω termination to the fast-rise output of the calibration generator; connect a 50-Ω cable to the termination.

b. Set the vertical amplifier plug- in unit deflection factor for a three-division display.

c. Remove the 7B92A from the extender and remove the extender from the oscilloscope plug-in compartment; install the 7B92A into the plug-in compartment.

d. Set the TIME/DIV OR DLY TIME switch to 2 ns (knob pushed in).

b. Set the DELAY TIME MULT dial to 3.00. c. Align the second time-mark to the second

vertical graticule line, using the POSITION control.

d. Check-that the tenth time-mark is within 0.16

division of tenth vertical graticule line.

e. Adjust-20 ns Timing, C440, for one tim e-mark

per division over center eight graticule divisions.

f. Align the display to place leading edge of Delayed sweep time-mark at intersection of horizontal and vertical graticule centerlines, using the POSITION control and the vertical amplifier position control.

g. Set the DELAY TIME MULT dial to 9.00.

e. Set the MAIN TRIGGERING LEVEL control f or a stable display (TRIG’D light on), and set the oscilloscope intensity control for desired display.

f. Set the POSITION control fully clockwise.

g. Check-the leading edge of the pulse for a setting to the right of graticule center.

h. Remove the 7B92A from the osc illos c ope plugin compartment and re-install the 7B92A with extender into the compartment.

i. Adjust-Time Positioning, R925, to position leading edge of pulse 3.5 divisions from left side of graticule.

j. Repeat parts c and g of this step.

5-35

Performance Check/Calibration-7B92A

k. Disconnect the 50-Ω cable from the calibration generator.

C12. Check Sweep Timing

NOTE The tolerances given in Table 5-7 are for ambient temperature range of +150C to +350C. If outside

this range, see the Specification section for

applicable tolerances.

Table 5-7.

SWEEP TIMING

TIME/DIV Time-Mark (+15°C to +35°C)

OR DLY'D Generator

DLY TIME Time/Division Setting Delaying Sweep Delayed Sweep

0.2 s 0.2 s 0.2 s Within 0.16 div Within 0.16 div

0.1 s 0.1 s 0.1 s Within 0.16 div Within 0.16 div 50 ms 50 ms 50 ms Within 0.16 div Within 0.16 div 20 ms 20 ms 20 ms Within 0.16 div Within 0.16 div 10 ms 10 ms 10 ms Within 0.16 div Within 0.16 div

5 ms 5 ms 5 ms Within 0.16 div Within 0.16 div 2 ms 2 ms 2 ms Within 0.16 div Within 0.16 div 1 ms 1 ms 1 ms Within 0.16 div Within 0.16 div

0.5 ms 0.5 ms 0.5 ms Within 0.16 div Within 0.16 div

0.2 ms 0.2 ms 0.2 ms Within 0.16 div Within 0.16 div

5 µs5 µs5 µs Within 0.16 div Within 0.16 div 2 µs2 µs2 µs Within 0.16 div Within 0.16 div 1 µs1 µs1 µs Within 0.16 div Within 0.16 div

0.5 µs0.5 µs0.5 µs Within 0.16 div Within 0.16 div

0.2 µs0.2 µs0.2 µs Within 0.16 div Within 0.16 div

a. Set the TIME/DIV OR DLY TIME, DLY’D Time/Division in Alternate mode (PULL FOR ALT), and time-mark generator as indicated in Table 5-7; set DELAY TIME MULT dial to 0.0.

b. Check-using the settings given in Table 5-7, check sweep accuracy for onetime mark/division over the center eight divisions within the tolerance given in Table 5-7. Set the POSITION control and MAIN TRIGGERING LEVEL control as necessar y for a stable display that is aligned with the vertical graticule lines.

Tolerance

5-36

Performance Check/Calibration-7B92A

NOTE If the time-mark generator used does not have 1-2-5 sequence markers, apply 1 unit markers in place of 2 unit markers and check for 2 markers/division over the center eight divisions of display, to the toleranc es given in Table 5-7.

c. Push in the DLY’D Time/Division knob and

position the display to the center of the graticule.

FAST TIMING

TIME/DIV Time-Mark

OR Generator Display Tolerance

DLY TIME Setting Markers/Division (+15°C to +35°C)

5 ns 5 ns 1 Within 0.24 div 2 ns 2 ns 1 Within 0.24 div

C13. Check Sweep Linearity

a. Set the TIME/DIV OR DLY TIME and DLY’D Time/Division switch to 1 ms and pull DLY’D Time/Division knob out for Alternate mode.

b. Set the time-mark generator for 1 ms markers.

c. Position the Delaying (top) and Delayed-sweep traces horizontally to start on the first graticule line.

d. Check-that the fourth marker of the Delaying sweep coincides within 0.1 division with the fourth vertical graticule line.

d. Check-using the settings given in Table 5-8, check sweep accuracy over the center eight divisions within the tolerance given in Table 5-8.

NOTE

The HF SYNC MODE switch may provide a better

display when checking the fastest sweep rates.

Table 5-8.

g. Set the TIME/DIV OR DLY TIME and DLY’D Time/Division switch to 10 ns and pull DLY’D Time/Division knob out for Alternate mode.

h. Set the time-mark generator for 10 ns markers.

i. Check-perform linearity chec k as in parts d, e, and f of this step. Tolerance is 0.1 division for each two divisions over center eight graticule divisions.

j. Set the DLY’D Time/Division to Normal mode (knob in).

k. Check-continue linearity check for Delayed sweep rates as shown in Table 5-9.

e. Check-continue linearity check, as in part d of this step, for each successive two divisions of the Delaying sweep.

f. Check-repeat parts d and e of this step to check linearity of the Delayed (bottom) sweep.

Table 5-9.

FAST SWEEP LINEARITY

Time-mark

Time/ Generator Markers/ Tolerance/

Division Setting 2 Divisions2 Divisions

5 ns 5 ns 2 0.2 div 2 ns 2 ns 2 0.2 div

5-37

C14. Check Variable Time/Division Range

a. Remove the 7B92A from the osc illos c ope plugin compartment.

b. Place the Time/Division Variable Selector multi-pin connector on P761 (Delaying Sweep). See Fig. 1-1 for location.

c. Insert the 7B92A into the oscilloscope plug-in compartment; turn on the power to the oscilloscope.

Performance Check/Calibration-7B92A

d. Set the time-mark generator for 100 p markers.

e. Set the TIME/DIV OR DLY TIME and DLY’D Time/Division switch to 20 µs and pull DLY’D Time/Division knob out for Alternate m ode. Check that the DELAY TIME MULT dial is 0.0.

f. Pr ess and release VARIABLE control and turn it fully counterclockwise.

g. Check-that Delaying sweep markers ( top) and Delayed sweep markers are displayed as shown in Fig. 5-8; at least 2-1/2 Delaying sweep markers to one Delayed sweep marker are visible.

h. Remove the 7B92A from the osc illos c ope plugin compartment; reposition the Time/Division Variable Selector multi-pin connector to P760 and re-install the 7B92A into the plug-in compartment. T urn on power to the oscilloscope.

i. Check-with VARIABLE control released and turned fully counterclockwise, at least two Delayed sweep markers ( bottom) to one Delaying sweep marker is visible. Refer to Fig. 5-14.

C15. Check Differential Delay Time Accuracy

Fig. 5-14. Variable Time/Division Range

b. Set the time-mark generator for 100 ms

markers.

c. Set the vert ical amplifier plug-in unit def lection

factor for approximately two divisions of display.

d. Set the DELAY TIME MULT dial to 0.90. e. Align the time-mark to the center vertical

graticule line, using the POSITION control.

f. Turn the DELAY TIME MULT dial to approximately 8.9 to align the time-mark to the center vertical graticule line.

a. Set the TIME/DIV OR DLY TIME switch to 200

ms, DLY’D Time/Division switch (pull knob out) to 5 ms

(then push knob in), push in VARIABLE (CAL IN) control,

and adjust MAIN TRIGGERING LEVEL control for a

stable display (TRIG’D light on).

g. Check-the DELAY TIME MULT dial to read within three minor divisions of 8.90 (8.87 to 8.93).

h. Repeat parts d through g of this step f or each sweep rate given in Table 5-10. Maintain approxim ately two divisions of display.

5-38

Performance Check/Calibration-7B92A

Table 5-10.

DIFFERENTIAL DELAY TIME ACCURACY

Time-mark

TIME/DIV OR DLY’D Generator

DLY TIME Time/Division Setting

.2 s 5 ms 0.1 s

.1 s 2 ms 50 ms 50 ms 1 ms 10 ms 20 ms 0.5 ms 10 ms 10 ms 0.2 ms 5 ms

5 ms 0.1 ms 1 ms 2 ms 50 µs1 ms

1 ms 20 µs 0.5 ms .5 ms 10 µs 0.1 ms .2 ms 5 µs 0.1 ms .1 ms 2 µs 50 µs 50 µs1 µs 10 µs 20 µs.5 µs 10 µs 10 µs.2 µs5 µs

5 ps .1 µps 1 µs 2 µs 50 ns 1 µs

1 µs 20 ns 0.5 µs .5 µs 10 ns 0.1µs .2 µs 5 ns 50 ns .1 µs 5 ns 50 ns

e. Align the leading edge of the time-mark to the center vertical graticule line, using the POSITION control. See Fig. 5-15 for reference.

Fig. 5-15. Fast delay time accuracy.

f. Check-set the DELAY TIME MULT dial to the settings listed in Table 5-11,’and check vor maximum error in dial reading.

Table 5-11.

FAST DIFFERENTIAL DELAY TIME ACCURACY

DELAY TIME MULT Maximum Error

(Minor Dial Divisions)

C16. Check Fast Delay Time Accuracy

a. Set the TIME/DIV OR DLY TIME switch to 50 ns, DLY’D Time/Division switch (pull knob out) to 10 ns(then push knob in), and adjust the MAIN TRIGGERING LEVEL control for a stable display (TRIG’D light on).

b. Set the time-mark generator for 50 ns markers. c. Set the vertical amplifier plug-in unit deflection

factor for approximately two divisions of display.

d. Set the DELAY TIME MULT dial to 9.00.

9.0 0 (step e)

8.0 Within 3.0

7.0 Within 3.5

6.0 Within 4.0

5.0 Within 4.5

4.0 Within 5.0

3.0 Within 3.0

2.0 Within 6.0

1.0 Within 6.5

h. Set the time-mark generator for 20 ns markers.

5-39

Performance Check/Calibration-7B92A

i. Repeat parts d, e, and f of this step.

j. Set the TIME/DIV OR DLY TIME switch to 10 ns, DLY’D Time/Division switch (pull knob out) to 1 ns (then push knob in), and adjust the MAIN TRIGGERING LEVEL control for a stable display (TRIG’D light on).

k. Set the time-mark generator for 10 ns markers.

I. Repeat parts d, e, and f of this step. Delete check at DELAY TIME MULT dial setting of 1.0.

C 17. Check Delay Jitter

b. Set the time-mark generator for 1 ms markers.

c. Set the DELAY TIME MULT dial to approximately 1.0 (position the time-mark to the center of the graticule).

d. Set the DLY’D Time/Division switch to 0.2 us.

f. Check-jitter must not exceed one division

(disregard slow drift).

g. Set the TIME/DIV OR DLY TIME switch to 20 us, DLY’D Time/Division switch (pull knob out) to 50 ns (then push knob in), and adjust the MAIN TRIGGERING LEVEL control for a stable display (TRIG’D light on).

h. Set the time-mark generator for 50 ns markers.

i. Set the DLY’D Time/Division switch to 5 ns.

j. Turn the DELAY TIME MULT dial slowly to position the time-mark near the graticule center (turn up INTENSITY control as necessary).

k. Check-jitter must not exceed 0.9 division.

I. Turn the DELAY TIME MULT dial to approximately 9.0 and position the time-mark to the center of the graticule.

m. Check-jitter must not exceed 0.9 division. This completes the Calibration procedure of the 7B92A.

e. Turn the DELAY TIME MULT dial slowly to position the time-mark near the graticule center (turn up INTENSITY control as necessary).

5-40

Section 6-7B92A

OPTIONS

No Options available at the time of this printing. Ref er to the CHANGE INFORMATION in the back of this manual for Options available after this printing.

REV A, JUN 1978

6-1

Section 7-7B92A

REPLACEABLE

ELECTRICAL PARTS

PARTS ORDERING INFORMATION

Replacement parts are available from or through your local Tektronix, Inc. Field Office or

representative.

Changes to Tektronix instruments are sometimes made to accommodate improved components as they become available, and to give you the benefit of the latest circuit impr ovements developed in our engineering department It is theref ore important, when ordering parts, to include the following information in your order: Part number , ins trument type or number, serial number, and modification number if applicable.

If a part you have ordered has been replaced with a new or improved part, your local Tek tronix, Inc Field Office or representative will contact you concerning any change in part number

Change information, if any, is located at the rear of this manual.

SPECIAL NOTES AND SYMBOLS

X000 Part first added at this serial number 00X Part removed after this serial number

ITEM NAME

In the Parts List, an Item Nam e is separated from the description by a colon (:). Because of space limitations, an Item Name may sometimes appear as incomplete For further Item Name identification, the U.S Federal Cataloging Handbook H6-1 can be utilized where possible.

ABBREVIATIONS

ACTR ACTUATOR PLSTC PLASTIC ASSY ASSEMBLY QTZ QUARTZ CAP CAPACITOR RECP RECEPTACLE CER CERAMIC RES RESISTOR CKT CIRCUIT RF RADIO FREQUENCY COMP COMPOSITION SEL SELECTED CONN CONNECTOR SEMICOND SEMICONDUCTOR ELCTLT ELECTROLYTIC SENS SENSITIVE ELEC ELECTRICAL VAR VARIABLE INCAND INCANDESCENT WW WIREWOUND LED LIGHT EMITT4NG DIODE XFMR TRANSFORMER NONWIR NON WIREWOUND XTAL CRYSTAL

7-1

Replaceable Electrical Parts-7B92A

CROSS INDEX-MFR. CODE NUMBER TO MANUFACTURER

Mfr. Code Manufacturer Address City, State, Zip

00853 SANGAMO ELECTRIC CO., S. CAROLINA DIV. P 0 BOX 128 PICKENS, SC 29671 01002 GENERAL ELECTRIC COMPANY, INDUSTRIAL

01121 ALLEN-BRADLEY COMPANY 1201 2ND STREET SOUTH MILWAUKEE, WI 53204 01295 TEXAS INSTRUMENTS, INC., SEMICONDUCTOR

01963 CHERRY ELECTRICAL PRODUCTS CORPORATION 3600 SUNSET AVENUE WAUKEGAN, IL 60085 02111 SPECTROL ELECTRONICS CORPORATION 17070 EAST GALE AVENUE CITY OF INDUSTRY, CA 91745 03508 GENERAL ELECTRIC COMPANY, SEMI-CONDUCTOR

04222 AVX CERAMICS, DIVISION OF AVX CORP. P O BOX 867, 19TH AVE. SOUTH MURTLE BEACH, SC 29577 04713 MOTOROLA, INC., SEMICONDUCTOR PROD. DIV. 5005 E MCDOWELL RD, PO BOX 20923 PHOENIX, AZ 85036 07910 TELEDYNE SEMICONDUCTOR 12515 CHADRON AVE. HAWTHORNE, CA 90250 08806 GENERAL ELECTRIC CO., MINIATURE

10389 CHICAGO SWITCH, INC. 2035 WABANSIA AVE. CHICAGO, IL 60647 11237 CTS KEENE, INC. 3230 RIVERSIDE AVE. PASO ROBLES, CA 93446 12617 HAMLIN, INC. GROVE & LAKE STS. LAKE MILLS, WI 53551 12697 CLAROSTAT MFG. CO., INC. LOWER WASHINGTON STREET DOVER, NH 03820 14193 CAL-R, INC. 1601 OLYMPIC BLVD. SANTA MONICA, CA 90404 15818 TELEDYNE SEMICONDUCTOR 1300 TERRA BELLA AVE. MOUNTAIN VIEW, CA 94043 28480 HEWLETT-PACKARD CO., CORPORATE HQ. 1501 PAGE MILL RD. PALO ALTO, CA 94304 32293 INTERSIL, INC. 10900 N. TANTAU AVE. CUPERTINO, CA 95014 32997 BOURNS, INC., TRIMPOT PRODUCTS DIV. 1200 COLUMBIA AVE. RIVERSIDE, CA 92507 50347 OPCOA, DIVISION OF IDS 330 TALMADGE ROAD EDISON, NJ 08817 56289 SPRAGUE ELECTRIC CO. NORTH ADAMS, MA 01247 71590 CENTRALAB ELECTRONICS, DIV. OF

72982 ERIE TECHNOLOGICAL PRODUCTS, INC. 644 W. 12TH ST. ERIE, PA 16512 73138 BECKMAN INSTRUMENTS, INC., HELIPOT DIV. 2500 HARBOR BLVD. FULLERTON, CA 92634 74970 JOHNSON, E. F., CO. 299 10TH AVE. S. W. WASECA, MN 56093 78488 STACKPOLE CARBON CO. ST. MARYS, PA 15857 80009 TEKTRONIX, INC. P 0 BOX 500 BEAVERTON, OR 97077 81483 INTERNATIONAL RECTIFIER CORP. 9220 SUNSET BLVD. LOS ANGELES, CA 90069 90201 MALLORY CAPACITOR CO., DIV. OF

91637 DALE ELECTRONICS, INC. P. O. BOX 609 COLUMBUS, NE 68601

AND POWER CAPACITOR PRODUCTS DEPARTMENT JOHN STREET HUDSON FALLS, NY 12839

GROUP P O BOX 5012, 13500 N CENTRAL

EXPRESSWAY DALLAS, TX 75222

PRODUCTS DEPARTMENT ELECTRONICS PARK SYRACUSE, NY 13201

LAMP PRODUCTS DEPARTMENT NELA PARK CLEVELAND, OH 44112

GLOBE-UNION, INC. P O BOX 858 FORT DODGE, IA 50501

P. R. MALLORY AND CO., INC. 3029 E WASHINGTON STREET

P 0 BOX 372 INDIANAPOLIS, IN 46206

7-2

REV. B JUNE 1978

Replaceable Electrical Parts-7B92A

Tektronix Serial/Model No. Mfr

Ckt No. Part No. Eff Dscont Name & Description Code Mfr Part Number

A1 670-3275-00 CKT BOARD ASSY:EXTERNAL INPUT 80009 670-3275-00

A2 670-3271-00 CKT BOARD ASSY:SOURCE SWITCH 80009 670-3271-00 A3 670-3272-00 CKT BOARD ASSY:COUPLING SWITCH 80009 670-3272-00 A4 670-3270-00 CKT BOARD ASSY:TRIGGER MODE 80009 670-3270-00 A5 670-3273-00 CKT BOARD ASSY:DELAY TRIGGER SWITCH 80009 670-3273-00 A6 670-3274-00 B010100 B029999 CKT BOARD ASSY:MAIN INTERFACE 80009 670-3274-00 A6 670-3274-01 B030000 B069999 CKT BOARD ASSY:MAIN INTERFACE 80009 670-3274-01 A6 670-3274-02 B070000 CKT BOARD ASSY:MAIN INTERFACE 80009 670-3274-02 A7 670-3276-00 B010100 B059999 CKT BOARD ASSY:SWEEP LOGIC 80009 670-3276-00 A7 670-3276-01 B060000 CKT BOARD ASSY:SWEEP LOGIC 80009 670-3276-01 A8 670-3277-00 B010100 B069999 CKT BOARD ASSY:MAIN TRIGGER 80009 670-3277-00 A8 670-3277-01 B070000 CKT BOARD ASSY:MAIN TRIGGER 80009 670-3277-01 A9 670-3278-00 B010100 B029999 CKT BOARD ASSY:DELAYED TRIGGER 80009 670-3278-00 A9 670-3278-01 B030000 B069999 CKT BOARD ASSY:DELAYED TRIGGER 80009 670-3278-01 A9 670-3278-02 B070000 CKT BOARD ASSY:DELAYED TRIGGER 80009 670-3278-02 A12 670-3279-00 CKT BOARD ASSY:READOUT 80009 670-3279-00 C2 281-0619-00 CAP., FXD, CER DI:1.2PF, +/-O.1PF, 200V 72982 374-000C0K0129B C8 281-0730-00 CAP., FXD, CER DI:10.8PF, l1%, 500V 72982 301055C0G1089F C10 281-0609-00 CAP., FXD, CER DI:1PF, +/-O.1PF, 500V 72982 374-005C0K0109B C11l 281-0617-00 CAP., FXD, CER DI:15PF, 10%, 200V 72982 374-001C0G0150K C12 283-0003-00 CAP., FXD, CER DI:0.01UF, +80-20%, 150V 72982 855-558Z5U-103Z C17 281-0578-00 B010100 B069999 CAP., FXD, CER DI:18PF, 5%, 500V 72982 301-050C0G0180J C17 283-0159-00 B070000 CAP., FXD, CER DI:18PF, 5%, 50V 72982 8111B065C0G0180J C18 281-0578-00 CAP., FXD, CER DI:18PF, 5%, 500V 72982 301-050C0G0180J C20 283-0251-00 CAP., FXD, CER DI:87 PF, 5%, 100V 72982 8121B145C0G0870J C22 283-0005-00 B010100 B069999 CAP. , FXD, CER DI:0.01UF, +100-0%, 250V 72982 8131N300Z5U0103P C22 283-0204-00 B070000 CAP., FXD, CER DI:0.1OUF, 20%, 50V 72982 8121N075Z5U0103M C24 283-0005-00 B010100 B069999X CAP., FXD, CER DI:0.01UF, +100-0%, 250V 72982 8131N300Z5U0103P C25 283-0005-00 B010100 B069999X CAP., FXD, CER DI:0.01UF, +100-0%, 250V 72982 8131N300Z5U0103P C27 283-0005-00 B010100 B069999X CAP., FXD, CER DI:0.01UF, +100-0%, 250V 72982 8131N300Z5U0103P C34 283-0065-00 B010100 B069999X CAP., FXD, CER DI:0.001UF, 5%, 100F, 100V 72982 805-518-Z5D0102J C37 283-0010-00 CAP., FXD, CER DI:0.05UF, +100-20%, 50V 56289 273C20 C43 281-0551-00 CAP., FXD, CER DI:390PF, 10%, 500V 04222 7001-1363 C44 281-0525-00 CAP., FXD, CER DI:470PF, +/-94PF, 500V 04222 7001-1364 C46 283-0191-00 CAP., FXD, CER DI:0.022UF, 20%, 50V 72982 8121N075Z5U0223M C56 283-0156-00 XB030000 B069999X CAP., FXD, CER DI:1000PF, +100-0%, 200V 72982 8111A208Z5U0102Z C61 283-0141-00 B010100 B069999X CAP., FXD, CER DI:200PF, 10%, 600V 14193 PD-0321-201K C64 283-0059-00 CAP., FXD, CER DI:1UF, +80-20%, 25V 72982 8141N037Z5U0105Z C65 283-0065-00 CAP., FXD, CER DI:O.OO1UF, 5%, 100F, 100V 72982 805-518-Z5DO102J C67 283-0103-00 XB070000 CAP., FXD, CER DI:18OPF, 5%, 500V 56289 4OC638 C70 283-0159-00 XB070000 CAP., FXD, CER DI:18PF, 5%, 50V 72982 8111B065COG0180J C79 283-0005-00 B010100 B069999X CAP., FXD, CER DI:0.01UF, +100-0%, 250V 72982 8131N300Z5U0103P C81 283-0000-00 XB070000 CAP., FXD, CER DI:0.001UF, +100-0%, 500V 72982 831-516E102P C91 283-0005-00 B010100 B069999X CAP., FXD, CER DI:0.O1UF, +100-0%, 250V 72982 8131N300Z5U0103P C94 283-0005-00 B010100 B063759 CAP., FXD, CER DI:0.01UF, (NOM VALUE), SEL 72982 8131N300Z5U0103P C94 283-0005-00 B063760 CAP., FXD, CER DI:0.01UF, +100-0%, 250V 72982 8131N300Z5U0103P C95 283-0005-00 8010100 B063759 CAP., FXD, CER DI:0.01UF, (NOM VALUE), SEL 72982 8131N300Z5U0103P C95 283-0005-00 B063760 CAP., FXD, CER DI:0.01UF, +100-0%, 250V 72982 8131N300Z5U0103P C122 283-0253-00 B010100 B069999X CAP., FXD, CER DI:10UF, 10%, 50V 72982 A15BF9A4LW5R103K C124 283-0140-00 B010100 B069999X CAP., FXD, CER DI:4.7PF, 5%, 50V 72982 8101E003A479C C127 283-0324-00 8010100 B069999X CAP., FXD, CER DI:0.01UF, 20%, 50V 72982 A01AA9AZLW5R103Z C128 283-0000-00 B010100 B069999X CAP., FXD, CER DI:0.001UF, +100-0%, 500V 72982 831-516E102P

7-3

REV. F JUNE 1978

Replaceable Electrical Parts-7B92A

Tektronix Serial/Model No. Mfr

Ckt No. Part No. Eff Dscont Name & Description Code Mfr Part Number C140 283-0119-00 XB070000 CAP., FXD, CER DI:2200PF, 5%, 200V 72982 855-535B222J

C141 283-0140-00 B010100 B069999X CAP., FXD, CER DI:4.7PF, 5%, 50V 72982 8101E003A479C C142 290-0517-00 B010100 B069999X CAP., FXD, ELCTLT:6.8UF, 20%, 35V 56289 196D685X0035KA1 C147 281-0523-00 B010100 B069999X CAP., FXD, CER DI:100PF, +/-20PF, 500V 72982 301-000U2M0101M C151 283-0032-00 B010100 B069999X CAP., FXD, CER DI:47OPF, 5%, 500V 72982 831-500Z5D471J C152 290-0517-00 B010100 B069999X CAP., FXD, ELCTLT:6.8UF, 20%, 35V 56289 196D685X0035KA1 C153 281-0525-00 XB070000 CAP., FXD, CER DI:470PF, +/-94PF, 500V 04222 7001-1364 C162 283-0000-00 B010100 B062792X CAP., FXD, CER DI:0.001UF, +100-0%, 500V 72982 831-516E102P C162 281-0786-00 XB070000 CAP., FXD, CER DI:150PF, 10%, 10OV 72982 8035D2AADX5P151K C163 283-0204-00 XB070000 CAP., PXD, CER DI:O.O1UF, 20%, 50V 72982 8121N07525U0103M C176 283-0318-00 B010100 B069999X CAP., PXD, CER DI:10PF, 100V 72982 A02AL9A4LCOG1OOF C190 283-0000-00 XB070000 CAP. , PXD, CER DI:0.001UF, +100-0O, 500V 72982 831-516E102P C191 283-0177-00 CAP., FXD, CER DI:1UF, +80-20%, 25V 72982 8131N039 E 105Z C192 283-0177-00 XB070000 CAP., FXD, CER DI:1UF, +80-20%, 25V 72982 8131N039 E 105Z C193 283-0177-00 BO010100 B069999 CAP., PXD, CER DI:1UF, +80-20%, 25V 72982 8131N039 E 105Z C193 283-0204-00 B070000 CAP., PXD, CER DI:0.01UF, 20%, 50V 72982 8121N075Z5U0103M C194 283-0024-00 XB070000 CAP., FXD, CER DI:O.1UF, +80-20%, 30V 72982 8131N075ZSu0104Z C195 283-0177-00 B010100 B069999X CAP., FXD, CER DI:1UF, +80-20%, 25V 72982 8131N039 E 105Z C196 283-0177-00 XB070000 CAP., FXD, CER DI1lUF, +80-20%, 25V 72982 8131N039 E 105Z C197 283-0204-00 XB070000 CAP., FXD, CER DI:0.01UF, 20%, 50V 72982 8121N075Z5U0103M C198 283-0204-00 XB070000 CAP., FXD, CER DI:0.01UF, 20%, 50V 72982 8121N075Z5U0103M C202 281-0619-00 CAP. , FXD, CER DI:1.2PF, +/-O.1PF, 200V 72982 374-000C0K0129B C211 281-0617-00 CAP., FXD, CER DI:15PF, 10%, 200V 72982 374-001COG0150K C212 283-0005-00 CAP., FXD, CER DI:0.01UF, +100-O%t, 250V 72982 8131N300Z5U0103P C214 283-0140-00 CAP., FXD, CER DI:4.7PF, 5%, 50V 72982 8101E003A479C C220 283-0059-00 B010100 B069999 CAP., FXD, CER DI:1UF, +80-20%, 25V 72982 8141N037Z5UO105Z C220 283-0251-00 B070000 CAP., FXD, CER DI:87 PF, 5%, 100V 72982 8121B145COG0870J C222 283-0005-00 XB070000 CAP., FXD, CER DI:O.OLUF, +100-0%, 250V 72982 8131N300Z5U0103P C224 283-0204-00 B010100 B069999X CAP., FXD, CER DI:0.01UF, 20%, 50V 72982 8121N075Z5U0103M C225 283-0005-00 B010100 B069999X CAP., FXD, CER DI:0.01UF, +100-0%, 250V 72982 8131N300ZSU0103P C226 283-0251-00 BO010100B069999X CAP., FXD, CER DI:87 PF, 5%, 100V 72982 8121B145COG0870J C231 283-0005-00 B010100 B069999X CAP., FXD, CER DI:0.01UF, +100-0%, 250V 72982 8131N300Z5U0103P C233 283-0204-00 B010100 B069999X CAP., FXD, CER DI:O.01UF, 20%, 50V 72982 8121N075Z5U0103M C243 283-0103-00 XB070000 CAP., FXD, CER DI:180PF, 5%, 500V 56289 400638 C246 283-0191-00 CAP., FXD, CER DI:0.022UF, 20%, 50V 72982 8121N075Z5U0223M C261 283-0141-00 B010100 B069999X CAP., FXD, CER DI:200PF, 10%, 600V 14193 PD-0321-201K C270 283-0159-00 XB070000 CAP., FXD, CER DI:18PF, 5%, 50V 72982 8111B065COG0180J C279 283-0005-00 B010100 B069999X CAP., FXD, CER DI:0.01UF, +100-0%, 250V 72982 8131N300Z5U0103P C289 283-0005-00 B010100 B069999X CAP., FXD, CER DI:0.01UF, +100-0%, 250V 72982 8131N300Z5U0103P C291 283-0005-00 B010100 B069999X CAP., FXD, CER DI:O.01UF, +100-0%, 250V 72982 8131N300Z5U0103P C295 283-0005-00 B010100 B069999X CAP., FXD, CER DI:0.01UF, +100-0%, 250V 72982 8131N300Z5U0103P C297 283-0005-00 B010100 B069999X CAP., FXD, CER DI:0.01UF, +100-0%, 250V 72982 8131N300Z5U0103P C321 283-0324-00 B010100 B069999X CAP., FXD, CER DI:O.O1UF, 20%, 5OV 72982 AOLAA9AZLW5R103Z C324 283-0140-00 B010100 B069999X CAP., FXD, CER DI:4.7PF, 5%, 50V 72982 8101E003A479C C325 283-0253-00 B010100 B069999X CAP., FPXD, CER DI:1OUF, 10%, 50V 72982 A15BF9A4LW5R103K C341 283-0140-00 B010100 B069999X CAP., FXD, CER DI:4.7PP, 5, 50V 72982 8101E003A479C C342 290-0517-00 B010100 B069999X CAP., FXD, ELCTLT:6.8UF, 20%, 35V 56289 196D685X0035KA1 C352 290-0517-00 B010100 B069999X CAP., FXD, ELCTLT:6.8UF, 20%, 35V 56289 196D685X0035KA1 C373 283-0318-00 B010100 B069999X CAP., FXD, CER DI:10PF, 10OOV 72982 A02AL9A4LCOG10OF C385 283-0204-00 B010100 B069999X CAP., FXD, CER DI:0.01UF, 20%, 50V 72982 8121N075Z5U0103M C387 281-0550-00 B010100 B029999X CAP., FXD, CER DI:120PF, 10, 500V 04222 7001-1373 C391 283-0177-00 CAP. , FXD, CER DI:1UF, +80-20%, 25V 72982 8131N039 E 105Z C392 283-0005-00 XB070000 CAP. , FXD, CER DI:0.01UF, +100-0%, 250V 72982 8131N300Z5U0103P

7-4

REV. E JUNE 1978

Replaceable Electrical Parts-7B92A

Tektronix Serial/Model No. Mfr

Ckt No. Part No. Eff Dscont Name & Description Code Mfr Part Number

C393 283-0177-00 CAP., FXD, CER DI:1UF, +80-20%, 25V 72982 8131N039 E 105Z C394 283-0204-00 XB070000 CAP., FXD, CER DI:0.01UF, 20%, 50V 72982 8121N075Z5U0103M C395 283-0177-00 B010100 B069999 CAP., FXD, CER DI:1UF, +80-20%, 25V 72982 8131N039 E 105Z C395 283-0024-00 B070000 CAP., FXD, CER DI:0.1UF, +80-20%, 30V 72982 8131N075Z5U0104Z C397 283-0177-00 XB070000 CAP., FXD, CER DI:1UF, +80-20%, 25V 72982 8131N039 E 105Z C398 283-0005-00 XB070000 CAP., FXD, CER DI:01.UF, +100-0%, 250V 72982 8131N300Z5U0103P C411 283-0051-00 CAP. , FXD, CER DI:0.0033UF, 5%, 100V 72982 8131N145COG033AJ C415 283-0111-00 CAP., FXD, CER DI:0.1UF, 20%, 50V 72982 8121-N088Z5U104M C431 283-0003-00 CAP., FXD, CER DI:0.01UF, +80-20%, 150V 72982 855-558Z5U-103Z C432 285-0889-00 CAP., FXD, PLSTC:0.0027UF, 5%, 100V 01002 61F10AC272 C438 283-0111-00 CAP., FXD, CER DI:0.1UF, 20%, 50V 72982 8121-N088Z5U104M C440 281-0153-00 CAP., VAR, AIR DI:1.7-10OPF, 250V 74970 187-0106-005 C441 283-0633-00 CAP., FXD, MICA D:77PF, 1%, 100V 00853 D151E770F0 C446 283-0111-00 CAP., FXD, CER DI:0.1UF, 20%, 50V 72982 8121-N088Z5U104M C448 283-0111-00 CAP., FXD, CER DI:0.1UF, 20%, 50V 72982 8121-N088Z5U104M C463 283-0047-00 XB070000 CAP., FXD, CER DI:270PF, 5%, 500V 72982 0831522Z5D00271J C473 283-0111-00 B010100 B059999X CAP., FXD, CER DI:O.1UF, 20%, 50V 72982 8121-N088Z5U104M C484 283-0648-00 CAP., FXD, MICA D:10PF, 5%, 100V 00853 D151C100DC C489 290-0527-00 CAP. , FXD, ELCTLT:15UF, 20%, 20V 90201 TDC156M020FL C491 290-0530-00 CAP. , FXD, ELCTLT:68UF, 20%, 6V 90201 TDC686M006NLF C492 283-0111-00 CAP., FXD, CER DI:O.1UF, 20%, 50V 72982 8121-N088Z5U104M C493 281-0584-00 B010100 B069999X CAP., FXD, CER DI:10OPF, 5%, 500V 72982 0301000Y5E0101J C508 283-0615-00 CAP., FXD, MICA D:33PF, 5%, 500V 00853 D155E330J0 C511 283-0051-00 CAP., FXD, CER DI:0.0033UF, 5%, 100V 72982 8131N145C0G033AJ C515 283-0111-00 CAP., FXD, CER DI:0.1UF, 20%, 50V 72982 8121-N088Z5U104M C531 290-0523-00 CAP., FXD, ELCTLT:2.2UF, 20%, 20V 56289 196D225X0020HA1 C532 285-0889-00 CAP., FXD, PLSTC:0.0027UF, 5%, 100V 01002 61F10AC272 C538 283-0111-00 CAP., FXD, CER DI:0.1UF, 20%, 50V 72982 8121-N088Z5U104M C540 281-0168-00 CAP., VAR, AIR DI:1.3-5.4PF, 250V 74970 187-0103-035 C546 283-0111-00 CAP. , FXD, CER DI:0.1UF, 20%, 50V 72982 8121-N088Z5U104M C548 283-0111-00 CAP., FXD, CER DI:0.1UF, 20%, 50V 72982 8121-N088Z5U104M C573 283-0111-00 CAP., FXD, CER DI:0.1UF, 20%, 50V 72982 8121-N088Z5U104M C607 281-0572-00 CAP., FXD, CER DI:6.8PF, +/-0.5PF, 500V 72982 301-000C0H0689D C705 C706 295-0172-00 CAP., SET MTCHD:1OUF, 0.lUF, 898PF, 0.75% 80009 295-0172-00 C707 C709 285-0598-00 CAP., FXD, PLSTC:0.01UF, 5%, 100V 01002 61F100AC103 C710 290-0183-00 CAP., FXD, ELCTLT: 1UF, 10%, 35V 56289 162D105X9035CD2 C715 C716 295-0172-00 CAP., SET MTCHD:10UF, O.1UF, 898PF, 0.75% 80009 295-0172-00 C717 C721 281-0166-00 CAP., VAR, AIR DI:1.9-15.7PF, 250V 74970 187-0109-005 C722 283-0647-00 CAP., FXD, MICA D:70PF, 1%, 100V 00853 D151E700F0 C750 290-0420-00 CAP., FXD, ELCTLT:0.68UF, 20%, 75V 56289 150D684X0075A2 C819 281-0504-00 CAP., FXD, CER DI:10PF, +/-1PF, 500V 72982 301-055C0G0100F C822 283-0177-00 CAP., FXD, CER DI:1UF, +80-20%, 25V 72982 8131N039 E 105Z C825 290-0536-00 CAP., FXD, ELCTLT:10UF, 20%, 25V 90201 TDC106M025FL C828 283-0177-00 CAP., FXD, CER DI:1UF, +80-20%, 25V 72982 8131N039 E 105Z C830 283-0111-00 CAP., FXD, CER DI:0.1UF, 20%, 50V 72982 8121-N088Z5U104M C834 283-0728-00 CAP., FXD, MICA D:120PF, 1%, 500V 00853 D15-5F121F0 C835 283-0646-00 CAP., FXD, MICA D:170PF, l%, 1OV 00853 D151E171F0 C837 283-0111-00 B0101001B069999 CAP., FXD, CER DI:0.1UF, 20%, 50V 72982 8121-N088Z5U104M C837 290-0536-00 B070000 CAP., FXD, ELCTLT:10UF, 20%, 25V 90201 TDC106M025FL

7-5

REV. F JUNE 1978

Replaceable Electrical Parts-7B92A

Tektronix Serial/Model No. Mfr

Ckt No. Part No. Eff Dscont Name & Description Code Mfr Part Number C844 290-0527-00 CAP. , FXD, ELCTLT:15UF, 20%, 20V 90201 TDC156M020FL

C852 283-0644-00 CAP. , FXD, MICA D:150PF, 1%, 500V 00853 D151E151FO C874 281-0603-00 CAP., FXD, CER DI:39PF, 5%, 500V 72982 308-00OCOG0390J C886 283-0111-00 8010100 8059999X CAP., FXD, CER DI:O.1UF, 20%, 50V 72982 8121-N088Z5U104M C891 283-0177-00 8010100 B059999 CAP., FXD, CER DI:1UF, +80-20%, 25V 72982 8131N039 E 105Z C891 290-0745-00 B060000 CAP., FXD, ELCTLT:22UF, +50-10%, 25V 56289 502D225 C893 283-0177-00 B010100 B059999 CAP., FXD, CER DI:1UF, +80-20%, 25V 72982 8131N039 E 105Z C893 290-0745-00 8060000 CAP., FXD, ELCTLT:22UF, +50-10%, 25V 56289 502D225 C895 283-0177-00 BO010100 B059999 CAP., FXD, CER DI:1UF, +80-20%, 25V 72982 8131N039 E 105Z C895 290-0745-00 8060000 CAP., FXD, ELCTLT:22UF, +S0-10%, 25V 56289 502D225 C905 283-0111-00 CAP., FXD, CER DI:O.1UF, 20%, 50V 72982 8121-N088Z5U104M C915 283-0111-00 CAP., FXD, CER DI:0.1UF, 20%, 50V 72982 8121-N088Z5U104M C935 283-0003-00 CAP., FXD, CER DI:0.01UF, +80-20%, 150V 72982 855-558Z5U-103Z C938 281-0540-00 CAP., FXD, CER DI:51PF, 5%, 500V 72982 301-000U2J0510J C942 283-0065-00 CAP., FXD, CER DI:0.001UF, 5, 100F, 10OOV 72982 805-518-Z5D0102J C944 283-0065-00 CAP., FXD, CER DI:0.001UF, 5%, 100F, 10OV 72982 805-518-ZSD0102J C952 281-0578-00 CAP., FXD, CER DI:18PF, 5%, 500V 72982 301-050COG0180J C954 283-0065-00 CAP., FXD, CER DI:0.001UF, 5%, 100F, 10OV 72982 805-518-Z5D0102J C971 283-0178-00 CAP., FXD, CER DI:0.1UF, +80-20%, 100V 72982 8131N145 E 104Z C972 290-0527-00 CAP., FXD, ELCTLT:15UF, 20%, 20V 90201 TDC156M020FL C973 290-0530-00 CAP., FXD, ELCTLT:68UF, 20%, 6V 90201 TDC686M006NLF C974 283-0111-00 CAP., FXD, CER DI:0.1UF, 20%, 50V 72982 8121-N088Z5U104M C975 283-0111-00 CAP., FXD, CER DI:O.1UF, 20%, 50V 72982 8121-N088Z5U104M C976 290-0527-00 CAP., FXD, ELCTLT:15UF, 20%, 20V 90201 TDC156M020FL C978 283-0111-00 CAP., FXD, CER DI:0.1UF, 20%, 50V 72982 8121-N088Z5U104M CR6 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR7 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR21 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR91 152-0141-02 8010100 B069999X SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR105 152-0141-02 8010100 B069999X SEMICOND DEVICE:SILICON, 30V, 1SOMA 07910 lN4152 CR113 152-0141-02 B010100 B069999X SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR114 152-0177-02 BO010100 8069999X SEMICOND DEVICE:TUNNEL, 10MA, +/-0.5MA, 2PF 80009 1520177-02 CR131 152-0141-02 8010100 8069999X SEMICOND DEVICE:SILICON, 30V, 150OMA 07910 1N4152 CR142 152-0141-02 XB070000 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR145 152-0141-02 XB070000 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR151 152-0141-02 XB070000 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR172 152-0177-02 8010100 8069999X SEMICOND DEVICE:TUNNEL, 1OMA, +/-0.5MA, 2PF 80009 1520177-02 CR176 152-0177-02 B010100 8069999X SEMICOND DEVICE:TUNNEL, 10MA, +/-0.5MA, 2PF 80009 1520177-02 CR221 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR289 152-0141-02 8010100 B069999X SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR291 152-0141-02 8010100 B069999X SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR313 152-0141-02 8010100 B069999X SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR314 152-0177-02 B010100 B069999X SEMICOND DEVICE:TUNNEL, 1OMA, +/-0.5 MA, 2PF 80009 1520177-02 CR335 152-0141-02 8010100 B069999X SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR336 152-0141-02 B010100 B069999X SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR337 152-0141-02 8010100 B069999X SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR338 152-0141-02 8010100 B069999X SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR342 152-0141-02 XB070000 SEMIOOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR362 152-0322-00 XB070000 SEMICOND DEVICE:SILICON, 15V, HOT CARRIER 28480 5082-2672 CR372 152-0177-02 BO010100 B069999X SEMICOND DEVICE:UNNEL, 10MA, +/-0. SMA, 2PF 80009 1520177-02 CR376 152-0177-02 B010100 B069999X SEMICOND DEVICE:TUNNEL, 1OMA, +/-0.5MA, 2PF 80009 1520177-02 CR381 152-0153-00 SEMICOND DEVICE:SILICON, 15V, SOMA 80009 152-0153-00 CR429 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152

7-6

REV. D JUNE 1978

Replaceable Electrical Parls-7B92A

Tektronix Serial/Model No. Mfr

Ckt No. Part No. Eff Dscont Name & Description Code Mfr Part Number

CR433 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR434 152-0153-00 SEMICOND DEVICE:SILICON, 15V, 50MA 80009 152-0153-00 CR443 150-1004-00 B010100 B063027 LAMP, LED:RED, 2.5V, 15MA 08806 SSL-12 CR443 150-1040-00 B062028 LAMP, LED:RED, 5MA, 2.0V 50347 LLL-7A CR444 152-0153-00 SEMICOND DEVICE:SILICON, 15V, 50MA 80009 152-0153-00 CR447 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR456 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR471 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR472 152-0322-00 SEMICOND DEVICE:SILICON, 15V, HOT CARRIER 28480 5082-2672 CR474 152-0153-00 B010100 B059999 SEMICOND DEVICE:SILICON, 15V, 50MA 80009 152-0153-00 CR474 152-0141-02 B060000 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR483 152-0182-00 SEMICOND DEVICE:TUNNEL, 1OMA, SOPF 03508 1N3719 CR488 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR493 152-0182-00 B0010100 B069999X SEMICOND DEVICE:TUNNEL, 1OMA, 50OPF 03508 1N3719 CR498 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR508 152-0153-00 SEMICOND DEVICE:SILICON, 15V, 50MA 80009 152-0153-00 CR510 152-0075-00 SEMICOND DEVICE:GE, 25V, 40MA 80009 152-0075-00 CR529 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR534 152-0153-00 SEMICOND DEVICE:SILICON, 15V, 50MA 80009 152-0153-00 CR543 152-0153-00 SEMICOND DEVICE:SILICON, 15V, 50MA 80009 152-0153-00 CR547 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR571 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR572 152-0322-00 SEMICOND DEVICE:SILICON, 15V, HOT CARRIER 28480 5082-2672 CR574 152-0153-00 SEMICOND DEVICE:SILICON, 15V, 50MA 80009 152-0153-00 CR602 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR606 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR611 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR612 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR613 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 15OMA 07910 1N4152 CR616 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 lN4152 CR617 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR618 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR633 152-0141-02 XB060000 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR634 152-0141-02 XB060000 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR751 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR752 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR753 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR755 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR758 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR761 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR762 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR763 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR764 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR765 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR766 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR771 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR772 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR773 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR774 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR775 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR776 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR781 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR785 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 lN4152

7-7

REV. F JUNE 1978

Replaceable Electrical Parts-7B92A

Tektronix Serial/Model No. Mfr

Ckt No. Part No. Eff Dscont Name & Description Code Mfr Part Number

CR786 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 15OMA 07910 1N4152 CR799 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR802 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR806 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR811 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR824 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR825 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 15OMA 07910 1N4152 CR826 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 15OMA 07910 1N4152 CR876 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR882 152-0153-00 B010100 B059999 SEMICOND DEVICE:SILICON, 15V, SOMA 80009 152-0153-00 CR882 152-0141-02 B060000 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR892 152-0075-00 SEMICOND DEVICE:GE, 25V, 40MA 80009 152-0075-00 CR894 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 IN4152 CR922 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 15OMA 07910 1N4152 CR930 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 15OMA 07910 lN4152 CR932 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR934 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR938 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 CR963 152-0141-02 SEMICOND DEVICE:SILICON, 30V, 150MA 07910 1N4152 DS10 150-0048-01 LAMP, INCAND:5V, 0.06A, SEL 08806 683AS15 DS20 150-0048-01 LAMP, INCAND:5V, 0.06A, SEL 08806 683AS15 DS100 150-0048-01 LAMP, INCAND:5V, 0.06A, SEL 08806 683AS15 DS820 150-0048-01 LAMP, INCAND:5V, 0.06A, SEL 08806 683AS15 DS845 150-0048-01 LAMP, INCAND:5V, 0.06A, SEL 08806 683AS15 K6 108-0358-00 COIL, REED SW:12V 80009 108-0358-00 L4 108-0170-01 COIL, RF:FIXED, 360NH 80009 108-0170-01 L46 108-0682-00 XB070000 COIL, RF:FIXED, 66NH 80009 108-0682-00 L61 276-0543-00 SHLD BEAD, ELEK:FERRITE 80009 276-0543-00 L62 108-0331-00 8010100 B069999X COIL, RF:0.75UH 80009 108-0331-00 L82 108-0440-00 XB070000 COIL, RF:8UH, TOROIDAL INDUCTOR 80009 108-0440-00 L84 108-0331-00 B010100 B069999X COIL, RF:0.75UH 80009 108-0331-00 L86 108-0440-00 XB070000 COIL, RF:8UH, TOROIDAL INDUCTOR 80009 108-0440-00 L91 108-0331-00 8010100 B069999X COIL, RF:0.75UH 80009 108-0331-00 L101 108-0331-00 8010100 B069999X COIL, RF:0.75UH 80009 108-0331-00 L112 276-0543-02 SHIELDING BEAD, : 80009 276-0543-02 L204 108-0170-01 COIL, RF:FIXED, 360NH 80009 108-0170-01 L246 108-0682-00 XB070000 COIL, RF:FIXED, 66NH 80009 108-0682-00 L261 276-0543-02 8010100 B069999X SHIELDING BEAD, : 80009 276-0543-02 L262 108-0331-00 B010100 B069999X COIL, RF:0.75UH 80009 108-0331-00 L284 108-0331-00 B010100 8069999X COIL, RF:0.75UH 80009 108-0331-00 L291 108-0331-00 B010100 B069999X COIL, RF:0.75UH 80009 108-0331-00 L301 108-0331-00 B010100 B069999X COIL, RF:0.75UH 80009 108-0331-00 L312 276-0543-02 B010100 B069999X SHIELDING BEAD, : 80009 276-0543-02 L382 108-0474-00 XB030000 B069999X COIL, RF:2UH 80009 108-0474-00 L462 276-0507-00 XB030000 SHIELDING BEAD, :0.6UH 78488 57-0180-7D 500B L493 276-0507-00 XB030000 B069999X SHIELDING BEAD, :0.6UH 78488 57-0180-7D 500B L558 108-0170-01 COIL, RF:FIXED, 360NH 80009 108-0170-01 L574 276-0507-00 SHIELDING BEAD, :0.6UH 78488 57-0180-7D 500B L938 276-0507-00 SHIELDING BEAD, :0.6UH 78488 57-0180-7D 500B LR72 108-0298-00 XB070000 COIL, RF:FIXED, 235NH 80009 108-0298-00 LR248 108-0298-00 XB070000 COIL, RF:FIXED, 235NH 80009 108-0298-00 LR482 108-0408-00 COIL, RF:100NH 80009 108-0408-00

7-8

REV. C JUNE 1978

Replaceable Electrical Parts-7B92A

Tektronix Serial/Model No. Mfr

Ckt No. Part No. Eff Dscont Name & Description Code Mfr Part Number

LR891 108-0543-00 COIL, RF:FIXED, 1.1UH 80009 108-0543-00 LR893 108-0543-00 COIL, RF:FIXED, 1.1UH 80009 108-0543-00 LR895 108-0543-00 COIL, RF:FIXED, 1.1UH 80009 108-0543-00 LR971 108-0537-00 COIL, RF:200UH 80009 108-0537-00 LR972 108-0537-00 COIL, RF:200UH 80009 108-0537-00 LR973 108-0537-00 COIL, RF:200UH 80009 108-0537-00 LR976 108-0537-00 COIL, RF:200UH 80009 108-0537-00 LR981 108-0543-00 COIL, RF:FIXED, 1.1UH 80009 108-0543-00 LR982 108-0543-00 COIL, RF:FIXED, 1.lUH 80009 108-0543-00 LR983 108-0543-00 COIL, RF:FIXED, 1.1UH 80009 108-0543-00 LR985 108-0543-00 COIL, RF:FIXED, 1.1UH 80009 108-0543-00 LR986 108-0543-00 COIL, RF:FIXED, .1.1UH 80009 108-0543-00 LR987 108-0543-00 COIL, RF:FIXED, 1.1lUH 80009 108-0543-00 Q22A, B 151-1011-00 TRANSISTOR:SILICON, JFE, N-CHANNEL, DUAL 80009 151-1011-00 Q24 151-0333-00 TRANSISTOR:SILICON, NPN, SEL FROM MPS918 80009 151-0333-00 Q52 151-0190-00 B010100 B069999X TRANSISTOR:SILICON, NPN 80009 151-0190-00 Q56 151-0188-00 B010100 B069999X TRANSISTOR:SILICON, PNP 80009 151-0188-00 Q58 151-0188-00 B010100 B069999X TRANSISTOR:SILICON, PNP 80009 151-0188-00 Q72 151-0192-00 B010100 B069999X TRANSISTOR:SILICON, NPN,SEL FROM MPS6521 80009 151-0192-00 Q74 151-0192-00 B010100 B069999X TRANSISTOR:SILICON, NPN,SEL FROM MPS6521 80009 151-0192-00 Q82 151-0190-00 B010100 B069999 TRANSISTOR:SILICON, NPN 80009 151-0190-00 Q82 151-0192-00 B070000 TRANSISTOR:SILICON, NPN,SEL FROM MPS6521 80009 151-0192-00 Q84 151-0190-00 B010100 B069999X TRANSISTOR:SILICON, NPN 80009 151-0190-00 Q86 151-0192-00 XB070000 TRANSISTOR:SILICON, NPN,SEL FROM MPS6521 80009 151-0192-00 Q94 151-0190-00 XB070000 TRANSISTOR:SILICON, NPN 80009 151-0190-00 96 151-0188-00 XB070000 TRANSISTOR:SILICON, PNP 80009 151-0188-00 )8 151-0188-00 XB070000 TRANSISTOR:SILICON, PNP 80009 151-0188-00 L02 151-0190-00 XB070000 TRANSISTOR:SILICON, NPN 80009 151-010-000 Q104 151-0325-00 B010100 B069999X TRANSISTOR:SILICON, PNP, SEL FROM 2N4258 80009 151-0325-00 Q106 151-0190-00 XB070000 TRANSISTOR:SILICON, NPN 80009 151-0190-00 Q109 151-0192-00 XB070000 TRANSISTOR:SILICON, NPN,SEL FROM MPS6521 80009 151-0192-00 Q112 151-0362-00 B010100 B069999X TRANSISTOR:SILICON, PNP, SEL FROM 2N4258 80009 151-0362-00 Q122 151-0192-00 B010100 B069999X TRANSISTOR:SILICON, NPN,SEL FROM MPS6521 80009 151-0192-00 Q132 151-0188-00 B010100 B069999X TRANSISTOR:SILICON, PNP 80009 151-0188-00 Q138 151-1005-00 XB070000 TRANSISTOR:SILICON, JFE, N-CHANNEL 80009 151-1005-00 Q142 151-0190-00 XB070000 TRANSISTOR:SILICON, NPN 80009 151-0190-00 Q146 151-0190-00 XB070000 TRANSISTOR:SILICON, NPN 80009 151-0190-00 Q148 151-0223-00 B010100 B069999X TRANSISTOR:SILICON, NPN 80009 151-0223-00 Q151 151-0221-00 B010100 B069999X TRANSISTOR:SILICON, PNP 80009 151-0221-00 Q152 151-0325-00 XB070000 TRANSISTOR:SILICON, PNP, SEL FROM 2N4258 80009 151-0325-00 Q158 151-0223-00 B010100 B069999X TRANSISTOR:SILICON, NPN 80009 151-0223-00 Q162 151-0188-00 B010100 B069999 TRANSISTOR:SILICON, PNP 80009 151-0188-00 Q162 151-0427-00 B070000 TRANSISTOR:SILICON, NPN 80009 151-0427-00 Q164 151-0188-00 B010100 B069999X TRANSISTOR:SILICON, PNP 80009 151-0188-00 Q174 151-0190-00 XB070000 TRANSISTOR:SILICON, NPN 80009 151-0190-00 Q222A, B 151-1011-00 TRANSISTOR:SILICON, JFE, N-CHANNEL, DUAL 80009 151-1011-00 Q224 151-0333-00 TRANSISTOR:SILICON, NPN, SEL FROM MPS918 80009 151-0333-00 Q256 151-0190-00 8010100 B069999X TRANSISTOR:SILICON, NPN 80009 151-0190-00 Q264 151-0190-00 XB070000 TRANSISTOR:SILICON, NPN 80009 151-0190-00 Q112 151-0362-00 8010100 B069999X TRANSISTOR:SILICON, PNP, SEL FROM 2N4258 80009 151-0362-00 Q128 151-0190-00 XB070000 TRANSISTOR:SILICON, NPN 80009 151-0190-00 Q332 151-0221-00 B010100 B069999X TRANSISTOR:SILICON, PNP 80009 151-0221-00 Q334 151-0192-00 B010100 B069999X TRANSISTOR:SILICON, NPN,SEL FROM MPS6521 80009 151-0192-00

7-9

REV. C JUNE 1978

Tektronix 7B92A Maintenance Manual

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