Tektronix 7704 schematic
TECHNICAL MANUAL
OPERATOR’S, ORGANIZATIONAL, DIRECT SUPPORT,
AND GENERAL SUPPORT MAINTENANCE MANUAL
INCLUDING REPAIR PARTS AND SPECIAL TOOLS LISTS
FOR
OSCILLOSCOPE, TEKTRONIX MODEL R7704
(NSN 6625-00-007-8487)
TM 11-6625-2922-14&P
HEADQUARTERS, DEPARTMENT OF THE ARMY
8 SEPTEMBER 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
transistors have voltages present on their cases. Disconnect power before cleaning the
equipment or replacing parts.
DON’T TAKE CHANCES!
Copyright 1970 by Tektronix Inc. All rights reserved. Reproduced by permission of the copyright owner, TEKTRO NIX
INC.
TM 11-6625-2922-14&P
TECHNICAL MANUAL HEADQUARTERS
No. 11-6625-2922-14&P WASHINGTON, DC, 8 September 1980
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, DA Form 2028 (Recommended
Changes to Publications and Blank Forms), or DA Form 2028-2 located in back of this manual
direct to: Commander, US Army Communications and Electronics Materiel Readiness Command,
ATTN: DRSEL-ME-MQ, Fort Monmouth, NJ 07703.
In either case, a reply will be furnished direct to you.
}
OPERATOR’S, ORGANIZATIONAL, DIRECT SUPPORT, AND
GENERAL SUPPORT MAINTENANCE MANUAL
(INCLUDING REPAIR PARTS AND SPECIAL TOOLS LISTS)
FOR
OSCILLOSCOPE, TEKTRONIX MODEL R7704
(NSN 6625-00-007-8487)
REPORTING ERRORS AND RECOMMENDING IMPROVEMENTS
DEPARTMENT OF THE ARMY
Table of Contents
Paragraph Page
SECTION 0. INTRODUCTION
Scope .................................................................................................................... 0-1 0-1
Indexes of Publications.......................................................................................... 0-2 0-1
Maintenance Forms, Records, and Reports.......................................................... 0-3 0-1
Reporting Equipment Improvement Recommendations (EIR).............................. 0-4 0-1
Administrative Storage .......................................................................................... 0-5 0-1
Destruction of Army Electronics Materiel............................................................... 0-6 0-1
This manual is an authentication of the m anufacturer’s commercial literature which, through usage, has been found to
cover the data required to operate and maintain this equipment. Since the manual was not prepar ed in accordance with
military specifications, the format has not been structured to consider levels of maintenance.
0.1
R7704
TABLE OF CONTENTS
SECTION 1. R7704 SPECIFICATION Page Page
Introduction 1-1 First-Time Operation
Table 1-1 Electrical General 2-7
Vertical Deflection System 1-1 Setup Information 2-7
Triggering 1-2 Calibration Check 2-8
Horizontal Deflection System 1-2 Vertical and Horizontal Mode 2-8
Calibrator 1-2 Triggering 2-9
External Z-Axis Input 1-2 Control Illumination 2-10
Signal Outputs 1-3 Readout 2-10
Character Generator 1-4 Beam Finder 2-10
Power Supply 1-4 Z-Axis Input 2-10
Display 1-4 Test Set-Up Chart
Table 1-2 Environmental Characteristics 1-4 General 2-10
Table 1-3 Physical Characteristics 1-5 General Operating Information
Standard Accessories 1-5 Simplified Operating Instructions 2-10
Instrument Options Intensity Controls 2-16
General 1-5 Display Focus 2-16
Option 1 1-5 Trace Alignment Adjustment 2-17
Option 2 1-5 Graticule 2-17
Option 3 1-5 Light Filter 2-17
System Specifications Beam Finder 2-17
Control Illumination 2-17
Readout 2-18
Remote Readout 2-19
SECTION 2 OPERATING INSTRUCTIONS Display Photography 2-19
General 2-1 Vertical and Horizontal Mode Switch
Preliminary Information Logic 2-19
Operating Voltage 2-1 Vertical Mode 2-20
Operating Temperature 2-2 Horizontal Mode 2-21
Rackmounting 2-2 Vertical Trace Separation 2-22
Display Definitions 2-2 Trigger Source 2-22
Plug-In Units X-Y Operation 2-22
General 2-3 Intensity Modulation 2-23
Plug-In Installation 2-3 Raster Display 2-24
Controls and Connectors Calibrator 2-24
General 2-3 Signal Outputs 2-24
Display Controls 2-5 Probe Power Connectors 2-25
Mode Selectors 2-5 Remote Connector 2-25
Output Connectors 2-6 Remote Single-Sweep Reset 2-25
Input Connectors 2-7 Applications 2-26
i
R7704
CONTENTS (Cont)
SECTION 3 CIRCUIT DESCRIPTION Page Page
Introduction 3-1 Lubrication 4-3
Block Diagram Visual Inspection 4-3
General 3-1 Semiconductor Checks 4-3
Circuit Operation Recalibration 4-3
General 3-3 Troubleshooting
Logic Fundamentals Introduction 4-3
General 3-3 Troubleshooting Aids 4-3
Symbols 3-3 Troubleshooting Equipment 4-4
Logic Polarity 3-3 Troubleshooting Techniques 4-7
Input/Output Tables 3-4 Special Troubleshooting Information 4-9
Non-Digital Devices 3-4 Corrective Maintenance
Main Interface General 4-18
General 3-7 Obtaining Replacement Parts 4-18
Logic Circuit Soldering Techniques 4-18
General 3-7 Component Replacement 4-19
Horizontal Logic 3-7 Recalibration After Repair 4-25
Z-Axis Logic 3-13 Instrument Repackaging 4-25
Horizontal Binary 3-14
Vertical Binary 3-16
SECTION 5 PERFORMANCE CHECK/CALIBRATION
Plug-In Binary 3-18
1 Clock Generator 3-20 Introduction 5-1
Vertical Chopped Blanking 3-21 Test Equipment Required
Chop Counter 3-24 General 5-1
Vertical Mode Logic 3-26 Test Equipment 5-1
Trigger Selector 3-27 Accessories 5-2
Vertical Interface 3-30 Adjustment Tools 5-2
Vertical Amplifier 3-33 Short-Form Procedure and Index 5-3
Horizontal Interface 3-35 Performance Check/Calibration Procedure
Horizontal Amplifier 3-36 General 5-5
Output Signals 3-38 Preliminary Procedure for Performance
CRT Circuit 3-41 Check Only 5-6
Line to DC Converter/Regulator 3-45 Preliminary Procedure for Complete
Low-Voltage Regulator 3-49 Calibration 5-6
Controls and Cabling 3-53 Preliminary Control Settings 5-6
Readout System Calibration Steps 5-7
Introduction to Readout System 3-54
Circuit Analysis of Readout System 3-60
SECTION 6 RACKMOUNTING
SECTION 4 MAINTENANCE Introduction 6-1
Introduction 4-1 Instrument Dimensions 6-1
Cover Removal 4-1 Rack Dimensions 6-1
Power-Unit Removal 4-1 Slide-Out Tracks 6-1
Preventive Maintenance Mounting Procedure 6-1
General 4-1 Removing or Installing the Instrument 6-5
Cleaning 4-2 Slide-Out Track Lubrication 6-5
ii
CONTENTS (Cont)
SECTION 7 ELECTRICAL PARTS LIST Page SECTION 9 MECHANICAL PARTS LIST
Abbreviations and Symbols Mechanical Parts List Information
Parts Ordering Information Index of Mechanical Parts List and
Index of Electrical Parts List Illustrations
Electrical Parts List Mechanical Parts List
Part Number-National Stock Number
Cross Reference Index
SECTION 8 DIAGRAMS AND CIRCUIT BOARD CHANGE INFORMATION
ILLUSTRATIONS Abbreviations and symbols used in this manual are
based on or taken directly from IEEE Standard 260
Symbols and Reference Designators 8-1 "Standard Symbols for Units", MIL-STD-12B and
Voltage and Waveform Test Conditions 8-2 other standards of the electronics industry.
Diagrams Change Information, if any, is located at the rear of
Circuit Board Illustrations this manual.
iii
R7704
Page
APPENDIX A. REFERENCES......................................................................................................................A-1
APPENDIX B. COMPONENTS OF END ITEM LIST (Not applicable)
APPENDIX C. ADDITIONAL AUTHORIZATION LIST (Not applicable)
APPENDIX D. MAINTENANCE ALLOCATION
Section I. Introduction............................................................................................................................D-1
II. Maintenance Allocation Chart for Oscilloscope, Tektronix Model R7704 .............................D-3
III. Tool and Test Equipment Requirements for Oscilloscope, Tektronix Model R7704 ............D-4
IV. Remarks................................................................................................................................D-5
APPENDIX E. REPAIR PARTS AND SPECIAL TOOLS LIST (See Section 7, Electrical Parts List)
APPENDIX F. EXPENDABLE SUPPLIES AND MATERIALS LIST (Not applicable)
iv
SECTION 0
INTRODUCTION
0-1. Scope
This manual contains instructions for the operation and
organizational, direct support, and general support
maintenance of Oscilloscope, Tektronix Model R7704.
Throughout this manual, Oscilloscope, Tektronix Model
R7704 is referred to as the R7704.
0-2. Indexes of Publications
c. Discrepancy in Shipment Report (DISREP) (SF
Fill out and forward Discrepancy in Shipment
361).
Report (DISREP) (SF 361) as prescribed in AR 5538/NAVSUPINST 4610.33B/AFR 75-18/MCO P4610.19C
and DLAR 4500.15.
0-4. Reporting Equipment Improvement
Recommendations (EIR)
a. DA Pam 310-4.
Pam 310-4 to determine whether there are new editions,
changes, or additional publications pertaining to the
equipment.
b. DA Pam 310-7.
determine whether there are modification work orders
(MWO’s) pertaining to the equipment.
0-3. Maintenance Forms, Records, and Reports
a. Reports of Maintenance
Equipment. Department of the Army forms and
procedures used for equipment maintenance will be
those prescribed by TM 38-750, The Arm y Maintenance
Management System.
Refer to the latest issue of DA
Refer to DA Pam 310-7 to
and Unsatisfactory
b. Report of Packaging and Handling Deficiencies
Fill out and forward DD Form 6 (Pac kaging Im pr ovem ent
Report) as prescribed in AR 735-11/NAVINST
4440.127E/AFR 400-54/MCO 4430.3E and DSAR
4140.55.
If your R7704 needs improvement, let us know. Send us
an EIR. You, the user, are the only one who 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 Commander, US Army
Communications and Electronics Materiel Readiness
Command, ATT ’N: DRSEL-ME-MQ, Fort Monmouth, NJ
07703. We’ll send you a reply.
0-5. Administrative Storage
To prepare the R7704 for administrative storage,
perform the procedures described in Section 4,
Maintenance, and Section 5, Performance
Check/Calibration. Upon removal from administrative
storage, perform the pr ocedures described in Section 5,
.
Performance Check/Calibration, to determine that the
equipment is fully operational.
0-6. Destruction of Army Electronics Materiel
Destruction of Army electronics materiel to prevent
enemy use shall be in accordance with TM 750-244-2.
0-1
Fig. 1-1. The R7704 Oscilloscope.
Fig. 1-1. The R7704 Oscilloscope
R7704 (A)
SECTION 1
R7704 SPECIFICATION
Change information, if any, affecting this section will be found at the rear of the manual.
R7704
Introduction
The Tektronix R7704 Oscilloscope is a solidstate, high performance instrument designed for
mounting in a 19-inch rack (complete rackmounting
information is given in Section 6). This instrument
accepts Tektronix 7-series plug-in units to form a
complete measurement system. The flexibility of this
plug-in feature and the variety of plug-in units available
allow the system to be used for many measurement
applications.
The R7704 has four plug-in com partments . The
left pair of plug-ins is c onnected to the vertical deflec tion
system. The right pair is connected to the horizontal
deflection system. Electronic switching between the
plug-in units connected to each deflection system allows
a dual-trace vertical display and/or a dual-sweep
horizontal display. This instrument features regulated
DC power supplies to assure that performance is not
affected by variations in line voltage and frequency, or by
changes in load due to the varying power requirements
of the plug-in units. Maximum power consumption of this
instrument is about 225 watts (60 hertz, 115-volt line).
The R7704 features a CRT with sm all spot size
and high writing speed. Graticule area is 8 X 10
centimeters. In addition, the instrument contains a
readout system to provide CRT display of alpha-numeric
information from the plug-in units; data such as
deflection factor, sweep rate, etc. can be encoded.
This instrument will meet the electrical
characteristics listed in Table 1-1 following complete
calibration as given in Section 5. The performance
check procedure included in Section 5 provides a
convenient method of check ing instrument performance
without making internal checks or adjustments. The
following electrical characteristics apply over a calibration
interval of 1000 hours and an ambient temperature range
of 0°C to +50° C, except as otherwise indicated.
Warmup time for given accuracy is 20 minutes.
NOTE
Many of the measurement capabilities of this
instrument are determined by the choice of
plug-in units. The following characteristics
apply to the R7704 Oscilloscope only. See
the system specification later in this section
for characteristics of the complete system.
TABLE 1-1.
ELECTRICAL
Characteristic Performance
VERTICAL DEFLECTION SYSTEM
Deflection Factor Compatible with all 7-series plug-
in units.
Deflection Accuracy Less than 1% difference
between vertical compartments.
Low-Frequency
Linearity
Bandwidth Varies with vertical plug-in
Risetime
(A) 1-1
0.1 division or less compression
or expansion of a center
-screen two- division
signal when positioned any-
where vertically within the
graticule area.
selected.
See System Specifications.
Characteristic Performance Requirement
Isolation Between At least 100:1 from DC to 150
Vertical Compartments
Chopped Mode
Repetition rate
Time segment 0.4 to 0.6 microsecond.
from each
compartment
Delay Line Permits viewing of leading edge
Difference in Delay 0.2 nanosecond or less.
Between Compartments
megahertz.
One megahertz ±20%.
of triggering signal
Specification-R7704
TABLE 1-1. (cont)
Characteristic Performance
Vertical Display LEFT: Left vertical unit only.
Modes (selected by
front-panel
VERTICAL MODE ADD: Added algebraically.
switch) CHOP: Dual-trace, chopped be-
Trace Separation
Range for
Dual-Sweep A trace.
Modes
Trigger Source
(selected by frontpanel A TRIGGER
SOURCE and B LEFT VERT: From left vertical
unit only.
TRIGGER SOURCE RIGHT VERT: From right vertical
switches) unit only.
HORIZONTAL DEFLECTION SYSTEM
Deflection Factor Compatible with all 7-series plug-
Deflection Accuracy Less than 1% difference
Fastest Calibrated Two nanoseconds/division.
Sweep Rate
Bandwidth at 10%
Down
Without phase DC to at least three megahertz
correction (10-division reference).
With phase DC to at least three megahertz
correction (10-division reference).
Phase Shift Between
Vertical and Horizontal Deflection
Systems
Without phase 2° or less from DC to at least 35
correction kilohertz.
With phase
correction
ALT: Dual-trace, alternate
between vertical units.
tween vertical units.
RIGHT: Right vertical unit only.
B trace can be positioned +4 to
+6 or -4 to -6 divisions from the
TRIGGERING
VERT MODE: Determined by
vertical mode.
in units.
between compartments.
DC to at least six megahertz
(five-division reference).
Adjustable to less than 2° from
DC to two megahertz.
TABLE 1-1. (cont)
Characteristic Performance Requirement
Chopped Mode
Repetition rate
Time segment. 2.0 to 3.0 microseconds
from each com-
partment
Horizontal Display A: A horizontal unit only.
Modes (selected by
front-panel HORIZONTAL MODE
switch) CHOP: Dual-sweep, chopped
Wave Shape Square wave.
Polarity Positive going with baseline at
Output Voltage
Open circuit 40 mV, 0.4 V, 4 V at front-panel
Into 50 ohms 20 mV, 0.2 V, 0.4 V at front-panel
Output Current 40 milliamperes with current-loop
Repetition Rate One kilohertz.
Accuracy +15 ° C to
Voltage and
current
Repetition rate Within 0.25%. Within 0.5%.
Risetime and Falltime
Duty Cycle 50% ± 0.1%.
EXTERNAL Z-AXIS INPUTS
High Sensitivity Input
Sensitivity Two volts peak to peak provides
200 kilohertz ±20%.
ALT: Dual-sweep, alternate be-
tween horizontal units.
ADD: Added alphabetically
between horizontal units
B: B horizontal unit only.
CALIBRATOR
zero volts.
pin jacks.
4 mV and 40 V available at inter-
nal circuit board connections.
pin jacks.
accessory (012-0259-00)
connected between 4 V pin jack
and
ground.
0°C to +50°C
+35°C
Within 1%. Within 2%.
0.25 microsecond or less.
trace modulation over full intensity
range.
(A) 1-2
Specification-R7704
TABLE 1-1. (cont)
Characteristic Performance Requirement
Useful input volt- Two volts peak to peak, DC to two
ages versus
repetition frequency
Polarity of
operation
megahertz; reducing to 0.4 volt
peak to peak at 20 meqahertz.
Positive-going signal decreases
trace intensity; negative- going
signal increases trace intensity.
Minimum pulse 30 nanoseconds at two volts.
width that provides intensity
modulation
Input resistance 500 ohms ± 10%.
at DC
Maximum input 15 volts (DC + peak AC).
voltage
High Speed Input
Sensitivity 60 volts peak to peak provides
trace modulation over full
intensity range.
Useful input volt- 60 volts peak to peak, DC to 100
age versus repeti- megahertz.
tion frequency
Polarity of
operation
Positive-going signal decreases
trace intensity; negative-going
signal increases trace intensity.
Minimum pulse 3.5 nanoseconds at 60 volts.
width that provides intensity
modulation
Input resistance 18 kilohms ± 20%.
at DC
Maximum input 60 volts (DC + peak AC); 60 volts
voltage peak to peak AC.
SIGNAL OUTPUTS
+Sawtooth
Source (selected A HORIZ time-base unit or B
by SWEEP HORIZ time-base unit.
switch)
Polarity Positive-going with baseline at
zero volts ± 1 volt (into one
megohm).
TABLE 1-1. (cont)
Characteristic Performance Requirement
Output voltage
Rate of rise
Into 50 ohms 50 millivolts/unit of time ± 15%.
Into one One volt/unit of time ±10%.
1
megohm
Peak voltage
Into 50 ohms Greater than 500 millivolts.
Into one Greater than 10 volts.
megohm
Output resistance 950 ohms ± 2%.
+Gate
Source (selected A HORIZ time-base unit.
by GATE B HORIZ time-base unit.
switch)
Delaying time-base unit (in A
HORIZ compartment).
Output voltage
Into 50 ohms 0.5 volt ± 10%.
Into one 10 volts ± 10%.
megohm
Risetime into 50 20 nanoseconds or less.
ohms
Output resistance 950 ohms ± 2%.
Vertical Signal
Output
Bandwidth Varies with vertical plug-in selec-
ted. See System Specification.
Risetime
Source Determined by B TRIGGER'
SOURCE switch.
Output voltage
Into 50 ohms 25 millivolts/division of vertical
deflection ± 25%.
Into one 0.5 volt/division of vertical deflecmegohm tion ± 25%.
Output resistance 950 ohms ± 2%.
1
Unit of time selected by time-base time/division switch.
1
(A) 1-3
Specification-R7704
TABLE 1-1. (cont)
Characteristic Performance Requirement
CHARACTER GENERATOR
Word Location See Fig. 2-5
POWER SUPPLY
Line Voltage Range
AC, RMS (Selected
by Line Selector
assembly on rear
panel).
115-volts nominal 90 to 136 volts.
230-volts nominal 180 to 272 volts.
Line Frequency 48 to 66 hertz (48 to 66 and 360
to 440 hertz with special MOD
101K).
Maximum Power
Consumption 225 watts, 2.8 amperes at 60
hertz, 115-volt line.
DISPLAY
Graticule
Type Internal with variable edge
lighting.
Area Eight divisions vertical by 10 divi-
sions horizontal. Each division
equals one centimeter.
Phosphor P31 standard. Others available
on special order.
Resolution
Horizontal At least 12 lines/division.
Vertical At least 12 lines/division.
Geometry 0.1 division or less total bowing
or tilt of a display horizontal or
vertical line.
Beam Finder Limits display within graticule
area when actuated.
Photographic Writing
Speed (without film
fogging techniques)
Tektronix C-51 At least 3300 centimeters/microCamera with f1.2 second with Polaroid2 Type 410
lens and 1:0.5 film (10,000 ASA) and P31 CRT
object-to-image phosphor.
ratio At least 7000 centimeters/micro-
second with Polaroid Type 410
film (10,000 ASA) and P11 CRT
phosphor.
2
Registered trademark of the Polaroid Corporation.
TABLE 1-1. (cont)
Tektronix C-27 At least 2200 centimeters/microCamera with f1.3
lens and 1:0.5
object-to-image phosphor.
ratio At least 5500 centimeters/micro-
second with Polaroid Type 410
film(10,000 ASA) and P31 CRT
second with Polaroid Type 410
film (10,000 ASA) and P11 CRT
phosphor.
TABLE 1-2.
ENVIRONMENTAL CHARACTERISTICS
Characteristic Performance
NOTE
This instrument will meet the electrical
characteristics given in Table 1-1 over the
following environmental limits. Complete
details on environmental test procedures,
including failure criteria, etc., can be
obtained from Tektronix, Inc. Contact your
local Tektronix Field Office or representative
Temperature Range
Operating 0°C to +50°C.
Non-operating -55°C to +75°C.
Altitude
Operating 15,000 feet.
Non-operating Test limit 50,000 feet.
Electro-magnetic
Interference (EMI)
as tested in MIL-I6181D (when equipped with Option 3
only)
Radiated inter- Interference radiated from the
ference instrument under test within the
given limits from 150 kilohertz to
1000 megahertz.
Conducted Interference conducted out of the
interference instrument under test through the
power cord within the given limits
from 150 kilohertz to 25 mega-
hertz.
Transportation(pack
aged instrument,
without plug-ins) 1A, Category II.
Qualifies under National Safe
Transit Committee test procedure
1-4 (A)
Specification-R7704
TABLE 1-3.
PHYSICAL CHARACTERISTICS
Characteristic Performance
Ventilation Safe operating temperature is
maintained by forced-air
cooling.
Automatic resetting thermal
cutout
protects instrument from over-
heating.
Warm-up Time 20 minutes for rated accuracy.
Finish Anodized front panel and
cabinet.
Overall Dimensions
(measured at maximum points)
Height 7.0 inches (17.7 centimeters).
Width 19.0 inches (48.3 centimeters).
Length 22.4 inches (56.9 centimeters)
behind front panel.
24.2 inches (61.7 centimeters)
over-all.
Net Weight (instru- 44 pounds (19.7 kilograms).
ment only)
STANDARD ACCESSORIES
Standard accessories supplied with the R7704
are given in the Mechanical Parts List illustrations. For
optional accessories available for use with this
instrument, see the Tektronix, Inc. catalog.
INSTRUMENT OPTIONS
General
The following options are available for the R7704
and can be installed as part of the instrument when
ordered, or they can be installed at a later time.
Complete information on all options for this instr ument is
given in this manual. For further information on
instrument options, see your Tektronix , Inc. catalog, or
contact your local Tektronix Field Office or
representative.
Option 1
This option deletes the Readout System. Operation
of the instrument is unchanged except that there is no
alphanumeric display on the CRT and the READOUT
control is non-functional. The Readout System can be
added at any time by ordering the readout conversion kit.
Option 2
The X-Y Delay Compensation Network can be added
to the instrument to equalize the signal delay between
the vertical and horizontal deflection systems. When this
network is installed and activated, the phase shift
between the vertical and horizontal channels is
adjustable to less than 20 from DC to two megahertz.
Option 3
With option 3 inst alled, the instrument will meet the
EMI interference specifications given in Table 1-2.
(A) 1-5
SYSTEM SPECIFICATIONS
Your Tektronix 7700-series oscilloscope system
provides exceptional flexibility in operation with a wide
choice of general and special purpose plug- in units . T he
type number of a particular plug-in unit identifies its
usage as follows: The first digit (7) denotes the
oscilloscope system for which the plug-in unit is designed
17000-series).
The second letter describes the purpose of the
plug-in unit:
A - Amplifier unit.
Specification-R7704
L - Spectrum analyzer, double width.
M - Miscellaneous.
S - Sampling unit.
T - Sampling time-base unit.
The third and fourth digits of the plug- in type number are
sequence numbers and do not carry any special
connotation.
B - "Real time" time-base unit.
An "N" suffix letter added to the normal four digit type
number identifies a unit not equipped with the circuitry
D - Digital unit.
necessary to encode data for the 7000-series readout
system.
J - Spectrum analyzer, single width.
K - Spectrum analyzer, single width.
7700-SERIES OSCILLOSCOPE SYSTEM VERTICAL SPECIFICATIONS
This table lists the vertical s pecif ications which are system dependent. For m ore com plete spec ific ations on plug-
in units for the 7000-Series Oscilloscope System, refer to the Tektronix Catalog.
Amplifier Vertical System Deflection Factor Accuracy* SIG OUT
Plug-In EXT CAL INT CAL INT CAL
Unit Probe BW Tr 0 to 50 ° C 15 to 35°C 0 to 50°C BW Tr
7A11 Integral 150 MHz 2.4 ns 2% 3% 4% 60 MHz 5.9 ns
None 105 MHz 3.4 ns 2% 3% 4% 55 MHz 6.4 ns
P6053 105 MHz 3.4 ns 3% 4% 5% 55 MHz 6.4 ns
None 100 MHz 3.5 ns 1.5% 2.5% 3.5% 55 MHz 6.4 ns
7A13 P6053 100 MHz 3.5 ns 1.5% 2.5% 3.5% 55 MHz 6.4 ns
P6055 65 MHz 5.4 ns 1.5% 2.5% 3.5% 45 MHz 7.8 ns
7A14 P6021 50 MHz 7.0 ns 2% 3% 4% 40 MHz 8.8 ns
P6022 105 MHz 3.4 ns 2% 3% 4% 50 MHz 7.0 ns
7A15 None 75 MHz 4.7 ns 2% 3% 4% 50 MHz 7.0 ns
P6053 75 MHz 4.7 ns 3% 4% 5% 50 MHz 7.0 ns
7A16 None 150 MHz 2.4 ns 2% 3% 4% 60 MHz 5.9 ns
P6053 150 MHz 2.4 ns 3% 4% 5% 60 MHz 5.9 ns
7A18 None 75 MHz 4.7 ns 2% 3% 4% 50 MHz 7.0 ns
P6053 75 MHz 4.7 ns 3% 4% 5% 50 MHz 7.0 ns
7A22 None or
any
1.0 MHz
± 10%
350 ns
± 9%
2% 3% 4% 1.0 MHz
± 10%
350 ns
±9%
*Deflection Factor accuracy is checked as follows:
EXT CAL 0° C to 50°C-Plug-in gain set at a temperature within 10°C of operating temperature, using an external calibrator whose
accuracy is within 0.25%.
INT CAL 15°C to 35°C-Plug-in gain set while operating within a temperature range of +15°C to +35°C, using the oscilloscope
calibrator.
INT CAL 0°C to 50°C-Plug-in gain set using the oscilloscope calibrator (within 10°C of the operating temperature} in a temperature
range between 0°C and +50°C.
1-6
SECTION 2
OPERATING INSTRUCTIONS
Change information, if any, affecting this section will be found at the rear of this manual.
R7704
General
To effectively use the R7704, the operation and
capabilities of the instrument must be known. This
section describes the operation of the front-, side-, and
rear-panel controls and connectors and gives first time
and general operating information.
PRELIMINARY INFORMATION
Operating Voltage
WARNING
This instrument is designed for operation from
a power source with its neutral at or near earth
(ground) potential with a separate safety-earth
conductor. It is not intended for operation
from two phases of a multi-phase system, or
across the legs of a single-phase, three-wire
system.
The R7704 can be operated from either a 115volt or a 230-volt nominal line voltage source. T he Line
Selector assembly on the rear panel converts this
instrument from one operating voltage to the other. This
assembly also includes fuses to provide protection for
the line-input portion of this instrument. Use the
following procedure to obtain correct instrument
operation from the line voltage available.
Power Cord Conductor Identification
Conductor Color Alternate
Color
Ungrounded (Line) Brown Black
Grounded (Neutral) Blue White
Grounding (Earthing) Green-Yellow Green-Yellow
4. Re-install the cover and tighten the captive
screws.
5. Before applying power to the instrument, check
that the indicator tab on the switch bar is protruding
through the correct hole for the desired nominal line
voltage.
CAUTION
This instrument may be damaged if operated
with the Line Selector assembly set to
incorrect positions for the line voltage applied.
1. Disconnect the instrument from the power
source.
2. Loosen the two captive screws which hold the
cover onto the selector assembly; then pull to remove
the cover.
3. To convert from 115-volts to 230-volts nominal
line voltage, or vice versa, pull out the Selector switch
bar (see Fig. 2-1) and plug it back into the remaining
holes. Change the line-cord power plug to match the
power-source receptacle or use a 115 to 230-volt
adapter.
REV. C, NOV. 1976 2-1
Fig. 2-1. Line Selector assembly on rear panel (shown with
Fig. 2-1. Line Selector assembly on rear panel (shown
cover removed).
with cover removed).
Operating Instructions-R7704
TABLE 2-1.
Regulating Ranges
Line Selector Regulating
Switch Position Range
115 V 90 to 136 volts
230 V 180 to 272 volts
The R7704 is designed to be used with a threewire AC power system. If a three- to two-wire adapter is
used to connect this instrum ent to a two-wire AC power
system, be sure to connect the ground lead of the
adapter to earth (ground). Failure to complete the
ground system may allow the chassis of this instrum ent
to be elevated above ground potential and pose a shock
hazard.
Operating Temperature
The R7704 can be operated where the ambient
air temperature is between 0°C and +50° C. This
instrument can be stored in ambient temperatures
between -55°C and +75°C. After storage at
temperatures beyond the operating limits, allow the
chassis temperature to c ome within the operating limits
before power is applied.
The R7704 is cooled by air drawn in through the
air filter on the rear panel and blown out through the
holes on the right side. Adequate clearance must be
provided at these locations (see Dim ensional Drawing in
Section 7). Allow at least one and one-half inches
clearance behind the air filter and at least one inch on
the right side.
A thermal cutout in this instrument provides
thermal protection and disconnects the power to the
instrument if the internal temperature exceeds a safe
operating level. Power is automatically restored when
the temperature returns to a safe level. O peration of this
instrument for extended periods without the covers may
cause it to overheat and the thermal cutout to open.
Also, check the air filter occasionally; a dirty filter will
prevent adequate air flow into the instrument.
which are defined in the instruction manuals for these
special units. The following terminology will be used
throughout this manual (see Simplified Operating
Instructions in this section for set-up information to obtain
each of these displays).
Single Trace
A display of a single plot produced by one
vertical signal and one sweep.
Dual Trace
A display of two plots produced by two vertical
signals and one sweep.
Dual Sweep
A display of two plots produced by one vertical
signal and two sweeps. Both sweeps operate
independently.
Dual Trace-Dual Sweep
A display of four plots produced by combining
two vertical signals and two sweeps. Each vertical signal
is displayed against each sweep. Both sweeps oper ate
independently.
Independent Pairs
A display of two plots produced by two vertical
signals, each displayed against its own sweep (LEFT
versus B; RIGHT versus A). Both sweeps operate
independently. This simulates a dual-beam display for
most repetitive combinations.
Delayed Sweep-Single Trace
A display of a single plot produced by one
vertical signal and a delayed sweep. Two sweeps are
used to produce this display; the sweeps are operating
with a delaying/delayed relationship where one sweep
(identified as the delaying sweep) delays the start of the
second sweep (identified as the delayed sweep). This
display can be expanded to present two plots, produced
by one vertical signal displayed against both the delaying
and the delayed sweep.
Rackmounting
Complete instructions for rackmounting the
R7704 are given in Section 6.
DISPLAY DEFINITIONS
General
The following definitions describe the types of
displays which can be obtained with an R7704
Oscilloscope system with real-t ime amplifiers, tim e-base
units, or combinations of these. Use of special pur pose
plug-in units may result in different types of displays,
Delayed Sweep-Dual Trace
A display of two plots produced by combining
two vertical signals and a delayed sweep. Two sweeps
are used to produce this display; the sweeps are
operating with a delaying/delayed relationship. Each
vertical signal is displayed against the delayed sweep.
This display can be expanded to present four plots,
produced by displaying
2-2 (A)1
Operating Instructions-R7704
both vertical signals against both the delaying and the
delayed sweep.
X-Y
A plot of two variables, neither of which
represents time.
PLUG-IN UNITS
General
The R7704 is designed to accept up to four
Tektronix 7-series plug-in units. This plug-in feature
allows a variety of display combinations and also
allows selection of bandwidth, sensitivity, display mode,
etc. to meet the measurement requirements. In
addition, it allows the oscilloscope system to be
expanded to meet future measurement requirements.
The overall capabilities of the resultant system is in
large part determined by the characteristics of the plugin unit selected. A list of the curr ently available plug-in
units for this instrument along with their major
specifications, is given in Section 1. For mo re complete
information, see the current Tektronix, Inc. catalog.
Plug-In Installation
To install a plug-in unit into one of the plug-in
compartments, align the slots in the top and bottom of
the plug-in with the associated guide rails in the plug-in
compartment. Push the plug-in unit firmly into the plug-in
compartm ent until it locks into place. T o remove a plugin, pull the release latch on the plug-in unit to disengage
it and pull the unit out of the plug-in compartment. Plugin units can be removed or installed without turning off
the instrument power.
The plug-in versatility of the R7704 allows a
variety of display modes with many different plug-ins.
Specific inform ation for obtaining these displays is given
under Display Combinations later in this section.
However, the following information is provided here to
aid in plug-in installation.
To produce a single-trace display, install a
single-channel vertical unit (or dual-channel unit set for
single-channel operation) in either of the vertical
compartments. For dual-trace displays, either install a
dual-channel vertical unit in one of the vertical
compartm ents or install a single channel vertical unit in
each vertical compartment. A combination of a singlechannel and dual-channel vertical unit allows a threetrace display; likewise, a combination of two dualchannel vertical units allows a four-trace display.
For single time-base displays, the tim e-base unit
can be placed in either horizontal compartment.
However, for dual time-base displays, other
considerations must be taken into account. In the ALT
position of the VERTICAL MODE switch and ALT or
CHOP position of the HORIZONTAL MODE switch, the
plug-ins in the LEFT VERT and B HORIZ com partments
are displayed together and the RIGHT VERT and A
HORIZ plug-ins are displayed together (independent
pairs operation). Therefore, the vertical and horizontal
units must be correctly mated if a special display is
desired. If delayed sweep operation is desired, a
delaying time-base unit must be installed in the A HO RIZ
(DELAYING TIME BASE) compartm ent. Any compatible
7B-series unit can be used as a delayed timebase in the
B HOR IZ compartment.
It is not necessary that all of the plug-in
compartments be filled to operate the instrument; the
only plug-ins needed are those required for the
measurement to be made. However, at environmental
extremes, exces s interference may be radiated into this
instrument through the open plug-in compartments.
Blank plug-in panels are available from Tektronix , Inc . to
cover the unused compartments; order Tektronix Part
No. 016-0155-00.
When the R7704 is calibrated in accordance with
the calibration procedure given in this ins tr uct ion manual,
the vertical and horizontal gain are normalized. This
allows calibrated plug-in units to be changed from one
plug-in compartment to another without recalibration.
However, the basic calibration of the individual plug-in
units should be checked when they are installed in this
system to verify their measurement accuracy. See the
operating instructions section of the plug-in unit
instruction manual for verification procedure.
(A) 2-3
X-Y displays can be obtained in two ways with
the R7704 system. If a 7B-series time-base unit is
available which has an amplifier f eature, the X s ignal c an
either be routed through one of the vertic al units via the
internal trigger pickoff circuitry to the horizontal system,
or connected to the external horizontal input connector of
the time-base unit. Then, the vertical signal (Y) is
connected to the remaining vertical unit. Also, a 7Aseries amplifier unit can be installed in one of the
horizontal compartments for X-Y operation.
Special purpose plug-in units ma y have specific
restrictions regarding the plug-in com partments in which
they can be installed. This information will be given in
the instruction manuals for these plug-in units.
CONTROLS AND CONNECTORS
General
The major controls and connectors for operation
of the R7704 are located on the front panel of the
instrument. Some aux iliary functions are pr ovided on the
side, top, and rear panels. Fig. 2-2 shows the front and
rear panels of
Operating Instructions-R7704
Fig. 2-2. External controls and connectors
Fig. 2-2. External controls and connectors.
2-4
2-4
(A)
R7704. To make full use of the capabilities of this
instrument, the operator should be familiar with the
function and use of each of these controls and
connectors. A brief description of each control and
connector is given here. More detailed operating
information is given under General Operating
Information.
Display Controls
A INTENSITY Controls brightness of the trace
produced by the plug-in unit in the
A HORIZ (DELAYING TIME
BASE) compartment. Light
behind the ’A’ of A INTENSITY
indicates when this control is
operative. Control is inoperative
(light off) when the A plug-in is not
selected for display by the
HORIZONTAL MODE switch or
when the A HORIZ compartment
is vacant.
BEAM FINDER Compresses display within
(PULL LOCK) graticule area independent of
display position or applied
signals. Momentary actuation
provided when button is pressed;
display remains compressed when
knob is pulled outward to lock it in
the "find" position.
TRACE ROTATION Screwdriver adjustment to align
trace with horizontal graticule
lines.
B INTENSITY Controls brightness of the trace
produced by the plug-in unit in the
B HORIZ compartment. Light
behind the ’B’ of B INTENSITY
indicates when this control is
operative. Control is inoperative
(light off) when the B plug-in is not
selected for display by the
HORIZONTAL MODE switch or
when the B HORIZ compartment
is vacant.
FOCUS Screwdriver adjustm ent to provide
optimum display definition.
READOUT Controls brightness of the readout
portion of the CRT. In the display
fully counter-clockwise position,
the Readout System is
inoperative.
GRAT ILLUM Controls graticule illumination.
Operating Instructions-R7704
ASTIG (side panel) Screwdriver adjustment used in
conjunction with the FOCUS control
to obtain a well-defined display.
Does not require readjustment in
normal use.
CONTROL ILLUM Controls illumination level of push(side panel) button switches on the R7704 and
the associated plug-in units.
OFF: All pushbutton lights off. A
and B INTENSITY lights remain
at low intensity to provide a
power-on indication.
LOW: All pushbuttons illuminated
at low intensity.
HIGH: Pushbuttons illuminated at
maximum intensity.
Power
POWER Controls power to instrument.
Line Selector (rear Switching
assembly to select the panel)
nominal operating voltage (115 or
230 volts). The assembly also
includes the input power fuses.
Mode Selectors
VERTICAL MODE Selects vertical mode of operation.
LEFT: Signal from plug-in unit in
LEFT VERT compartment is
displayed.
CHOP: Signals from plug-in units in
both LEFT VERT and RIGHT
VERT compartments are
displayed. Display switched
between vertical plug-ins at a
one megahertz repetition rate.
ADD: Signals from plug-in units in
both LEFT VERT and RIGHT
VERT compartments are
algebraically added and the
algebraic sum displayed on the
CRT.
ALT: Signals from plug-in units in
both LEFT VERT and RIGHT
VERT compartments are
displayed. Display switched
between vertical plug-ins after
each sweep except for delayed
sweep operation. Then, the
display is switched between
vertical
(A) 2-5
Operating Instructions-R7704
plug-ins after every second
sweep. When the
HORIZONTAL MODE switch
is set to ALT or CHOP,
independent-pairs operation
is provided.
RIGHT: Signal from plug-in unit
in RIGHT VERT compartment is displayed.
A TRIGGER Selects source of internal trigger
SOURCE signal for the time-base in
the A HORIZ compartment.
VERT MODE: Trigger signal
automatically follows the
vertical display except in
CHOP (vertical); then the
trigger signal is the same as
for ADD.
LEFT VERT: Trigger signal is
obtained from plug-in unit in
LEFT VERT compartment.
RIGHT VERT: T rigger signal is
obtained from plug-in unit in
RIGHT VERT compartment.
HORIZONTAL Selects horizontal mode of
MODE operation.
A: Signal from plug-in unit in the
A HORIZ compartment is
displayed.
ALT: Signals from plug-in units
in both A HORIZ and B
HORIZ compartments are
displayed. Display switched
between horizontal plug-ins
at end of each sweep.
CHOP: Signals from plug-in
units in both A HORIZ and B
HORIZ compartments are
displayed. Display switched
between horizontal plug-ins
at a 0.2-megahertz repetition
rate.
B: Signal from plug-in unit in the
B HORIZ compartment is
displayed.
B TRIGGER Selects source of internal trigger
SOURCE signal for the time-base in
the B HORIZ compartment.
VERT MODE: Trigger signal
automatically follows the vertical
display except in CHOP
(vertical); then trigger signal is
the same as for ADD.
LEFT VERT: Trigger signal is
obtained from plug-in unit in
LEFT VERT compartment.
RIGHT VERT: Trigger signal is
obtained from plug-in unit in the
RIGHT VERT compartment.
VERT TRACE Vertically positions the trace proSEPARATION (B) duced by the plug-in unit in the B
HORIZ compartment up to four
divisions with respect to the trace
produced by the plug-in unit in the
A HORIZ compartment (dualsweep modes only).
Output Connectors
CALIBRATOR (4 V, Calibrator output connectors.
0.4 V, 40 mV, GND)
PROBE POWER Power source for active probe
systems. Two output
connectors provided; one on
front panel and one on rear
panel.
+ SAWTOOTH (rear Provides positive-going sample of
panel) sawtooth signal. SAWTOOTH
switch allows selection of sawtooth
from tim e-base unit in the A HORIZ
compartment or the B HORIZ
compartment.
+GATE (rear panel) Provides positive-going gate signal
coincident with the respective
sweep. GATE switch allows
selection of one of three gate
signals; the A gate from time-base
unit in A HORIZ compartment, the
B gate from time-base unit in B
HORIZ compartment, or the
delayed gate from delaying timebase unit in the A HORIZ
compartment.
SIG OUT (rear panel) Provides output signal from the
vertical plug-in units. Source of
the output signal at the SIG OUT
connector is selected by the B
TRIGGER SOURCE switch (see
B TRIGGER SOURCE for
description of sources
available).
2-6 (A)
Input Connectors
Z-AXIS INPUTS Input connectors for intensity
(rear panel) modulation of the CRT display.
HIGH SPEED: Input connector for
high-amplitude, high-frequency
Z-axis signals; usable from DC
to 100 megahertz.
HIGH SENSITIVITY: Input
connector for low-amplitude Zaxis signals; usable for signals
with repetition rates between DC
and 10 megahertz; input voltage
derating necessary between 2
and 10 megahertz.
J1075 REMOTE Nine-pin connector which
CONTROL (rear panel) provides remote single-sweep
reset and ready indication for
the time-base units in the A
HORIZ and B HORIZ
compartments (with compatible
timebase units only) and remote
read-out mode and single-shot
readout operation.
Miscellaneous
Operating Instructions-R7704
READOUT MODE Determines operating mode of the
Readout System.
FREE RUN-REMOTE: Readout
System free runs to present
characters as encoded by plugin
units. Free-running condition
can be interrupted for remote
single-shot operation through
J1075.
GATE TRIG’D: Readout System
is locked out so no characters
are displayed during the sweep
time. At the end of the sweep
gate selected by the GATE
switch, a single frame of all
applicable readout characters is
presented.
Ground (not labeled) Binding post to establish common
ground between the R7704 and any
associated equipment. One gr ound
post provided on the front panel
and one on the rear panel.
FIRST-TIME OPERATION
General
SAWTOOTH (top Selects source of signal for +
panel) SAW-TOOTH connector.
A: Sawtooth output signal
derived from time-base unit
in A HORIZ compartment.
B: Sawtooth output signal
derived from time-base unit
in B HORIZ compartment.
GATE (top panel) Selects source of signal for +
GATE connector.
A: Gate output signal derived
from time-base unit in A
HORIZ compartment.
B: Gate output signal derived
from time-base unit in B
HORIZ compartment.
DLY’D: Gate output signal
derived from delaying timebase unit in A HORIZ
compartment.
The following steps demonstrate the use of the
controls and connectors of the R7704. It is recomm ended
that this procedure be followed com pletely for fam iliarization
with this instrument.
Set-up Information
1. Set the controls as follows:
Front panel
A INTENSITY Counterclockwise
B INTENSITY Counterclockwise
BEAM FINDER Released
READOUT OFF
GRAT ILLUM Counterclockwise
POWER Off
VERTICAL MODE LEFT
A TRIGGER SOURCE VERT MODE
HORIZONTAL MODE A
VERT TRACE Midrange
SEPARATION (B)
B TRIGGER SOURCE VERT MODE
Side panel
CONTROL ILLUM OFF
(A) 2-7
Operating Instructions-R7704
2. Connect the R7704 to a power source that
meets the voltage and frequency requirements of this
instrument. If the available line voltage is outside the
limits of the Line Selector switch (on rear panel), see
Operating Voltage in this section.
3. Insert Tektronix 7A-series amplifier units into
both the LEFT VERT and RIGHT VERT compartments.
Insert Tektronix 7B-s er ies time-base units into both the A
HORIZ and B HORIZ compartments.
4. Set the POWER switch to ON. Allow several
minutes warmup so the instrument reaches a normal
operating temperature before proceeding.
5. Set both vertical units for a vertical deflection
factor of two volts/division and center the ver tic al pos ition
controls.
6. Set both time-base units for a sweep rate of 0.5
milliseconds/division in the auto, internal trigger mode.
7. Advance the A INTENSITY control until the trace
is at the desired viewing level (near midrange).
8. Connect the 4 V calibrator pin-jack to the input of
the left vertical unit with a BNC to pin-jack cable
(supplied accessory).
9. Check for a sharp, well-defined display over the
entire trace length (if focused display cannot be obtained,
see Display Focus in this section).
10. Disconnect the input signal and position the
trace with the left vertical unit position control so it
coincides with the center horizontal line of the graticule.
11. If the trace is not parallel with the center
horizontal line, see Trace Alignment Adjustment in this
section.
12. Rotate the GRAT ILLUM control throughout its
range and notice that the graticule lines are illuminated
as the control is turned clockwise (most obvious with
tinted filter installed). Set control so graticule lines are
illuminated as desired.
Calibration Check
13. Connect the 4 V calibrator pin-jack to the input
connector of either vertical unit with the BNC to pin-jac k
2-8 cable (supplied accessory) and a BNC T connector.
Connect the output of the BNC T connector to the input
of the other vertical unit with the 42-inch BNC cable
(supplied accessory).
14. The display should be two divisions in amplitude
with five complete cycles shown horizontally. An
incorrect display indicates that the plug-ins need to be
recalibrated. See the instruction manual of the
applicable plug-in unit for complete information.
Vertical and Horizontal Mode
15. Notice that the position controls of only the left
vertical unit and the A time-base unit have any effec t on
the displayed trace. Position the start of the trace to the
left line of the graticule with the A tim e-base unit position
control and move the trace to the upper half of the
graticule with the left vertical unit position control.
16. Press the RIGHT button of the VERTICAL
MODE switch. Also press the B button of the
HORIZONTAL MODE switch. Advance the B
INTENSITY control until the trace is at the desired
viewing level (about midrange).
17. Notice that the position controls of only the right
vertical unit and the B time-base unit have any effec t on
the displayed trace. Position the start of the trace to the
left graticule line with the B time-base position control
and move the display to the bottom half of the graticule
with the right vertical unit position control.
18. Press the ALT button of the VERTICAL MODE
switch. Notice that two traces are displayed on the CRT.
The top trace is produced by the left ver tical unit and the
bottom trace is produced by the right vertical unit; the
sweep for both traces is produced by the B time-base
unit. Reduce the sweep rate of the B time-base unit to
50 milliseconds/division. Notice that the display
alternates between the left and right vertical plug-ins
after each sweep. Turn the B time-base sweep rate
switch throughout its range. Notice that the display
alternates between vertical units at all sweep rates.
19. Press the CHOP button of the VERTICAL MODE
switch. Turn the B time-base unit sweep rate switch
throughout its range. Notice that a dual-tr ace display is
presented at all sweep rates, but unlike ALT, both
vertical units are displayed on each sweep on a timesharing basis. Return the B time-base unit sweep rate
switch to 0.5 millisecond/division.
20. Press the ADD button of the VERTICAL MODE
switch. The display should be four divisions in
amplitude.
2-8 (A)
Operating Instructions-R7704
Notice that the position control of either vertical unit
moves the display. Return the VERTICAL MODE s witch
to the LEFT position.
21. Press the ALT button of the HORIZONTAL
MODE switch. Two traces should be presented on the
CRT. If the display overlaps, adjust the VERT TRACE
SEPARATION (B) control to position one trace to the
bottom of the graticule area. Turn the sweep rate
switches of both timebase units throughout their range.
Notice that each timebase unit controls one of the trac es
independent of the other time-base unit. Also notice that
when one of the time-base units is set to a slow sweep
rate (below about 50 milliseconds/division) sweep
alternation is evident. Only one of the traces is
presented on the CRT at a time. Return the s weep r ates
of both time-base units to 0.5 millisecond/ division.
Adjust the A INTENSITY control. Notic e that it changes
the intensity of the trace produced by the A Timebase
unit only. Likewise, the B INTENSITY control changes
the intensity of the trace produced by the B timebase unit
only. Return both intensity controls to the desired level.
22. Press the CHOP button of the HORIZONTAL
MODE switch. Notice that two traces are s hown on the
CRT in a manner similar to the ALT display. Turn the
sweep rate switches of both time-bas e units throughout
their range. Notice that two traces are displayed on the
CRT at all sweep rates. Also notice that even when both
time-base units are set to a slow sweep rate (50
milliseconds/division or slower), both traces are visible
on the CRT at the same time. Return the sweep rate
switches of both time-base units to 0.5
millisecond/division.
23. Connect the BNC to pin-jack cable to the 0.4 V
calibrator output. Press the CHOP button of the
VERTICAL MODE switch. Four traces should be
displayed on the CRT. If not, adjust the position controls
of the vertical units and the VERT TRACE SEPARATION
(B) control to position the four traces onto the viewing
area. Adjust the position controls of the plug-in units to
identify which traces are produced from each of the plugin units (if vertical units have the identif y feature, it can
be used to identify the traces). Also, set one of the tim ebase units to a sweep rate of one millisecond/division.
Notice that the vertical deflection produced by the LEFT
VERT unit is displayed at the sweep rate of both the A
HORIZ and B HORIZ time-base units and that the
vertical deflection produced by the RIGHT VERT plug-in
unit is also displayed at the sweep rate of both the A
HORIZ and B HORIZ time-base units.
24. Press the ALT button of the HORIZONTAL
MODE switch. Notice that the display is very similar to
the display obtained in the previous step. The main
difference in this display is that the sweeps are pr oduced
alternately by the time-base units (noticeable only at slow
sweep rates).
25. Press the ALT button of the VERTICAL MODE
switch. Notice that only two traces are displayed on the
CRT. Also notice that one of the traces is produced by
the left vertical unit at the sweep rate of the B time-bas e
unit and the other trace is produced by the right vertical
unit at the sweep rate of the A time-base unit. This
feature is called independent-pairs operation, and is
obtained only when the VERTICAL MODE switch is in
the ALT position and the HORIZONTAL MODE switch is
in either the ALT or the CHOP position.
Triggering
26. Press the LEFT button of the VERTICAL MODE
switch and the A button of the HORIZONTAL MODE
switch. Center the display on the CRT with the left
vertical unit position control. Disconnect the input signal
from the right vertical unit input connector . Sequentially
press all of the VERTICAL MODE switch buttons. Notice
that a stable display is obtained in all positions of the
VERTICAL MODE switch (straight line in RIGHT
position).
27. Press the LEFT VERT button of the A T RIG G ER
SOURCE switch. Again, sequentially press all of the
VERTICAL MODE switch buttons. Notice that the
display is again stable in all positions, as in the previous
step.
28. Press the RIGHT VERT button of the A
TRIGGER SOURCE switch. Sequentially press all the
VERTICAL MODE switch buttons and notice that a
stable display cannot be obtained in any position. The
reason for this is that there is no input signal connected
to the right vertical unit. Return the A TRIGGER
SOURCE switch to VERT MODE.
29. The B TRIGGER SOURCE switch operates in a
similar manner to the A TRIGGER SOURCE switch
when the B time-base unit is selected for display.
Control Illumination
30. Notice that only the light associated with the A
INTENSITY control is illum inated. Sequentially press all
the HORIZONTAL MODE switch buttons and notice the
A or B INTENSITY lights; these lights indicate which
intensity control is active. The lights also provide an
indication that the POWER switch is on. Set the
CONTROL ILLUM switch (on left s ide panel) to the LOW
position. Notice that the selected pushbuttons of the
R7704 and the plug-in units are illuminated.
31. Change the CONTROL ILLUM switch to the
HIGH position. Notice that the selected pushbuttons of
the R7704 and the plug-in units are illuminated at
maximum
(A) 2-9
Readout
32. Note: This step applies only to instruments
equipped with the Readout System. Turn the READOUT
intensity control clockwise until an alpha-num eric display
is visible within the top or bottom division of the CRT
(reset the FOCUS adjustment if necessary for best
definition of the readout). Change the deflection factor of
the vertical unit that is selected for display. Notice that
the readout portion of the display changes as the
deflection factor is changed. Likewise, change the
sweep rate of the time-base unit which is selected for
display. Notice that the readout display for the time-bas e
unit changes also as the sweep rate is changed.
33. Set the time-base unit for magnified operation.
Notice that the readout display changes to indicate the
correct magnified sweep rate. If a readout-coded 10X
probe is available for use with the vertical unit, install it
on the input connector of the vertical plug-in. Notice that
the deflection factor indicated by the readout is increased
by 10 times when the probe is added. Return the timebase unit to normal sweep operation and disconnect the
probe.
34. Sequentially press all of the VERTICAL MODE
switch buttons and the HORIZONTAL MODE switch
buttons. Notice that the readout from a particular plug- in
occupies a specific location on the display area. If either
of the vertical plug-in units is a dual-tr ac e unit, notic e that
the readout for channel 2 appears within the lower
division of the CRT.
Beam Finder
35. Set the deflection factor of the vertical plug-in
which is displayed to 0.1 volt/division. Notice that a
square wave display is not visible since the deflection
exceeds the scan area of the CRT.
Operating Instructions-R7704
and release. Notice that the display remains within the
viewing area.
Z-Axis Input
38. If an external signal is available (five volts peak to peak minimum), the function of the Z-AXIS INPUTS
can be demonstrated. Remove the BNC cap from the
HIGH SENSITIVITY connector (on r ear panel). Connect
the external signal to both the input connector of the
displayed vertical unit and the HIGH SENSITIVITY
connector. Set the sweep rate of the displayed time
base to display about five cycles of the waveform. Adjust
the amplitude of the signal generator until intensity
modulation is visible on the display (change the ver tical
deflection factor as neces sary to produce an on-scr een
display). The positive peaks of the waveform should be
blanked out and the negative peaks intens ified. Notice
that the setting of the intensity controls determines the
amount of intensity modulation that is visible.
39. Remove the BNC cap from the HIGH SPEED
connector. Disconnect the external signal from the
HIGH SENSITIVITY connector and reconnect it to the
HIGH SPEED connector. Again increase the am plitude
of the signal generator until trace modulation is appar ent
on the displayed waveform. Notice that a higher
amplitude signal is necessary to produce trace
modulation. Again, the positive peaks of the waveform
should be blanked out and the negative peaks
intensified. Also, notice that the setting of the intensity
controls affects the amount of trace modulation. The
major difference between these two methods of
obtaining trace modulation is that the HIGH
SENSITIVITY input is more s ensitive, but that the HIGH
SPEED input has a higher usable frequency range.
Replace the BNC caps on both Z-AXIS INPUTS.
36. Press the BEAM FINDER switch. Notice that the
display is returned to the viewing area in compressed
form. Release the BEAM FINDER switch and notic e that
the display again disappears from the viewing area. Pull
the beam finder outward so it locks in the "find" position.
Notice that the display is again returned to the viewing
area in compressed form, but that in this position it
remains on the viewing area as long as the BEAM
FINDER switch is locked in the outward position.
37. With the BEAM FINDER switch locked in the
outward position, increase the vertical and horizontal
deflection factor until the display is reduced to about two
divisions vertically and horizontally (when the time-base
unit is in the time-base mode, change only the deflection
factor of the vertical unit). Adjus t the position controls of
the displayed vertical unit and the time-base unit to
center 2-10 the compressed display about the center
lines of the graticule. Press the BEAM FINDER switch in
(A) 2-10
40. This completes the basic operating procedure
for the R7704. Instrument operations not explained
here, or operations which need further explanation are
discussed under General Operating Information.
TEST SET-UP CHART
General
Fig. 2-3 shows the front, side, top, and rear panels of
the R7704. This chart may be reproduced and used as a
test setup record for spec ial m easurem ents, applic ations
or procedures, or it may be used as a training aid for
familiarization with this instrument.
GENERAL OPERATING INFORMATION
Simplified Operating Instructions
General. The following information is provided to aid
in quickly obtaining the correct setting for the R7704
controls
Operating Instructions-R7704
(A)
Fig. 2-3.
Fig. 2-3.
2-11
to present a display. The operator should be familiar with
the complete function and operation of this instrument as
described in this section before using this proc edure. For
detailed operating information for the plug-in units, see the
instruction manuals for the applicable units.
Single-Trace Display. The following procedur e will
provide a display of a single-trace vertical unit against one
time-base unit. For simplicity of explanation, the vertical
unit is installed in the LEFT VERT compartment and the
time-base unit is installed in the A HORIZ compartment.
Other compartments can be used if the following
procedure is changed accordingly.
1. Install 7A-series vertical units in both vertical plug-
in compartments.
2. Press the LEFT button of the VERTICAL MODE
switch.
3. Install a 7B-series time-bas e unit in the A HORIZ
compartment.
4. Press the A button of the HORIZONTAL MODE
switch.
5. Press the VERT MODE button of the A TRIGGER
SOURCE switch.
6. Set the POWER switch to ON. Allow several
minutes warmup.
7. Connect the signals to the input connectors of the
vertical units.
8. Set the vertical units for AC input coupling and
calibrated deflection factors.
9. Set the time-base unit for peak-to-peak auto,
internal triggering at a sweep rate of one
millisecond/division.
10. Advance the A INTENSITY control until a display
is visible (if display is not visible with A INTENSITY at
about midrange, press BEAM FINDER switch and adjust
the vertical deflection fac tor until the display is reduced in
size vertically; then center compressed display with vertical
and horizontal position controls; release BEAM FINDER).
Operating Instructions-R7704
11. Set the vertical deflection factor and vertical
position control for a display which remains within the
graticule area vertical.
12. If necessary, set the time-base triggering controls
for a stable display
13. Adjust the time-base position control so the
display begins at the left line of the graticule. Set the timebase sweep rate to display the desired number of cycles.
Dual-Trace Display. The following procedure will
provide a display of two single-trace vertical units agains t
one-time-base unit.
1. Install 7A-series vertical units in both vertical plug-
in compartments.
2. Press the LEFT button of the VERTICAL MODE
switch.
3. Install a 7B-series time-bas e unit in the A HORIZ
compartment.
4. Press the A button of the HORIZONTAL MODE
switch.
5. Press the VERT MODE button of the A TRIGGER
SOURCE switch.
6. Set the POWER switch to ON. Allow several
minutes warmup.
7. Connect the signals to the input connectors of the
vertical units.
8. Set the vertical units for AC input coupling and
calibrated deflection factors.
9. Set the time-base unit for peak-to-peak auto,
internal triggering at a sweep rate of one
millisecond/division.
10. Advance the A INTENSITY control until a display
is visible (if display is not visible with A INTENSITY at
about midrange, press BEAM FINDER switch and adjust
the vertical deflection fac tor until the display is reduced in
size vertically;
2-12 (A)
Operating Instructions-R7704
then center compressed display with vertical and
horizontal position controls; release BEAM FINDER).
11. Set the left vertical unit deflection factor for a
display about four divisions in amplitude. Adjust the
vertical position control to move this display to the top of
the graticule area.
12. Press the RIGHT button of the VERTICAL
MODE switch.
13. Set the right vertical unit deflection factor for a
display which is about four divisions in amplitude (if
display cannot be located, use BEAM FINDER switch).
Position this display to the bottom of the graticule area
with the RIGHT VERT position control.
14. Press the ALT or CHOP button of the VERTICAL
MODE switch. A dual-trace display of the signal from the
LEFT VERT and RIGHT VERT plug-ins should be
presented on the CRT (for more inform ation on c hoice of
dual-trace mode, see Dual-Trace Displays in this
section).
15. If necessary, adjust the time-base triggering
controls for a stable display.
7. Connect the signal to the input connector of the
vertical unit.
8. Set the vertical unit for AC input coupling and
calibrated deflection factors.
9. Set both time-base units for peak-to-peak auto,
internal triggering at a sweep rate of one millisecond/
division.
10. Advance the A INTENSITY control until a display
is visible (if display is not visible with A INTENSITY at
midrange, press BEAM FINDER switch and adjust
vertical deflection factor until display is reduced in size
vertically; then center compressed display with vertical
position control; release BEAM FINDER).
11. Set the vertical unit for a display about four
divisions in amplitude and move the display to the top of
the graticule area with the vertical position controls.
12. If necessary, set the A time-base unit for s table
triggering.
13. Set the A time-base sweep rate for the desired
display.
16. Adjust the time-base position control so the
display begins at the left graticule line. Set the time-base
sweep rate for the desired horizontal display.
Dual-Sweep Display. The following procedure will
provide a dual-sweep display of a single-trace vertical
unit against two time-base units.
1. Install a 7A-series vertical unit in the LEFT VERT
compartment.
2. Press the LEFT button of the VERTICAL MODE
switch.
3. Install 7B-series time-base units in both the A
and B HORIZ compartments.
4. Press the A button of the HORIZONTAL MODE
switch.
5. Press the VERT MODE buttons of the A and B
TRIGGER SOURCE switches.
6. Set the POWER switch to ON. Allow several
minutes warmup.
14. Press the B button of the HORIZONTAL MODE
switch.
15. Advance the B INTENSITY control until a display
is visible (if display is not visible with B INTENSITY at
midrange, press BEAM FINDER switch and adjust the
vertical deflection factor until display is reduced in size
vertically; then center compressed display with vertical
position control; release BEAM FINDER).
16. If necessary, set the B time-base unit for s table
triggering.
17. Set the B time-base unit sweep rate for the
desired display.
18. Press the ALT or CHOP button of the
HORIZONTAL MODE switch (see Dual-Sweep Displays
in this section for further information on selecting sweep
mode).
(A) 2-13
Operating Instructions-R7704
19. Adjust the VERT TRACE SEPARATION (B)
control to position the trace produced by the B time-base
unit with respect to the trace produced by the A timebase unit.
Dual Trace-Dual Sweep Displays. The following
procedure will provide a dual-trace, dual-sweep display
of two single-trace vertical units against two time-base
units (four traces displayed on CRT).
1. Install 7A-series vertical units in both vertical
compartments.
2. Press the LEFT button of the VERTICAL MODE
switch.
3. Install 7B-series time-base units in both
horizontal compartments.
4. Press the B button of the HORIZONTAL
DISPLAY switch.
5. Press the VERT MODE buttons of the A and B
TRIGGER SOURCE switches.
6. Set the POWER switch to ON. Allow several
minutes warmup.
7. Connect the signals to the input connectors of
the vertical units.
8. Set the vertical units for AC input coupling and
calibrated deflection factors.
9. Set both time-base units for peak-to-peak auto,
internal triggering at a sweep rate of one millisecond/
division.
10. Advance the B INTENSITY control until a display
is visible (if display is not visible with B INTENSITY at
midrange, press BEAM FINDER switch and adjust the
LEFT VERT deflection factor until display is reduced in
size vertically; then center compressed display with
LEFT VERT position controls; release BEAM FINDER).
11. Set the LEFT VERT deflection factor for a
display which is about two divisions in amplitude and
position the display to the top of the graticule area.
12. If necessary, adjust the B time-base unit
triggering controls for a stable display.
13. Position the start of the trace to the left gratic ule
line with the B time-base unit position control. Set the B
time-base unit sweep rate for the desired display.
14. Press the RIGHT button of the VERTICAL
MODE switch and the A button of the HORIZONTAL
MODE switch.
15. Advance the A INTENSITY control until a display
is visible (if display is not visible with A INTENSITY at
midrange, press BEAM FINDER switch and adjust the
RIGHT VERT deflec tion factor until display is reduced in
size vertically; then center compressed display with
RIGHT VERT position control; release BEAM FINDER).
16. Set the RIGHT VERT deflection factor for a
display about two divisions in amplitude and position the
display just below the center horizontal line of the
graticule.
17. If necessary, adjust the A time-base unit
triggering controls for a stable display.
18. Position the start of the trace to the left gratic ule
line with the A time-base unit position control. Set the A
time-base sweep rate for the desired display.
19. Press the ALT or CHOP button of the
HORIZONTAL MODE switch.
20. If necessary, adjust the VERT TRACE
SEPARATION (B) control to separate the two traces.
21. Press the CHOP button of the VERTICAL MODE
switch.
22. Adjust the vertical position controls and the
VERT TRACE SEPARATION (B) c ontrol as nec es s ary to
obtain the desired display.
Independent Pairs Display. The following
procedure will provide a dual-trace, dual-sweep display
where the LEFT VERT unit is displayed only at the
sweep rate of the B time-base unit and the RIGH T VERT
unit is displayed only at the sweep rate of the A timebase unit.
(A) 2-14
Operating Instructions-R7704
1. Follow steps 1 through 19 of the previous
procedure for Dual Trace-Dual Sweep Displays.
2. Press the ALT button of the VERTICAL MODE
switch.
3. If necessary, adjust the VERT TRACE
SEPARATION (B) control to separate the two traces.
The vertical deflection produced by the unit in the LEFT
VERT compartm ent is displayed at the sweep rate of the
time-base in the B HORIZ compar tment, and the vertical
deflection produced by the unit in the RIGHT VERT
compartment is displayed at the sweep rate of the tim ebase in the A HORIZ compartment.
Delayed Sweep-Single Trace. The following
procedure will provide a delayed-sweep display of a
single-trace vertical unit.
1. Follow the complete procedure given under
Single-Trace Displays.
2. Be sure the time-base unit installed in the A
HORIZ (DELAYING TIME BASE) compartment is a
delaying time-base unit.
1. Follow the complete procedure given under
Dual-Trace Displays.
2. Be sure the time-base unit installed in the A
HORIZ (DELAYING TIME BASE) compartment is a
delaying time-base unit.
3. Install a 7B-series time-base unit in the B HORIZ
compartment.
4. Follow the procedure given in the instruction
manual for the delaying sweep time-base unit to obtain a
delayed sweep display.
5. Press the B button of the HORIZONTAL MODE
switch and advance the B INTENSITY control until a
display is visible. Only the delayed sweep display of both
vertical traces is shown on this display.
6. Press the ALT or CHOP button of the
HORIZONTAL MODE switch.
7. Adjust the vertical position controls and the
VERT TRACE SEPARATION (B) c ontrol as nec es s ary to
obtain the desired display.
3. Install a 7B-series time-base unit in the B HORIZ
compartment.
4. Follow the procedure given in the instruction
manual for the delaying sweep time-base unit to obtain a
delayed sweep display.
5. Press the B button of the HORIZONTAL MODE
switch and advance the B INTENSITY control until a
display is visible. Only the delayed sweep is shown on
this display.
6. Press the ALT or CHOP button of the
HORIZONTAL MODE switch.
7. If necessary, adjust the VERT TRACE
SEPARATION (B) control to separate the two traces.
This display provides a simultaneous presentation of the
delaying (A HORIZ) time-base unit and the delayed (B
HORIZ) time base unit.
Delayed Sweep-Dual Trace. The following
procedure will provide a delayed-sweep display of two
single-trace vertical units (four traces displayed on
screen).
NOTE
When operated in the delayed-sweep
mode, there is no special display
relationship between the vertical and
horizontal plug-in as for independent
pairs operation regardless of the
vertical mode selected.
X-Y Display. The following procedure will provide an
X-Y display (one signal versus another rather than
against time).
NOTE
Some 7B-series time-base units have
provisions for amplifier operation in
the X-Y mode; see X-Y Operation in
this section for details of operation in
this manner.
1. Install 7A-series amplifier units in both the LEFT
VERT and the A HORIZ compartments.
2. Press the LEFT button of the VERTICAL MODE
switch and the A button of the HORIZONTAL MODE
switch.
(A) 2-15
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