Tektronix 2337 Instruction Manual

Tfektronix

COMMITTED TO EXCELLENCE

Tektronix, Inc. P.O. Box 500 Beaverton, Oregon 97077

070-4119-00

Product Group 40

PLEASE CHECK FOR CHANGE INFORMATION AT THE REAR OF THIS MANUAL.

2337

OSCILLOSCOPE

OPERATORS

INSTRUCTION

Serial Number

________________

MANUAL

First Printing SEP 1981 Revised MAY 1983

TABLE OF CONTENTS

Page

LIST OF ILLUSTRATIONS.................................................iii

LIST OF TABLES....................................................................v

OPERATORS SAFETY SUMMARY

....................................

vi

INTRODUCTION....................................................................1

PREPARATION FOR USE

....................................................

2

LINE VOLTAGE SELECTION

.......................................

2

LINE FUSE

........................................................................

4

POWER CORD....................................................................5

CONTROLS, CONNECTORS, AND INDICATORS

..........

6

POWER AND DISPLAY....................................................6

VE R TICAL.........................................................................7

HORIZONTAL..................................................................10

ATRIG GER....................................................................12

BTRIGGER

................................................

15

REAR PANEL..................................................................18

Page

OPERATING CONSIDERATIONS

....................................

20

GRATICULE................................. 20

GROU NDIN G.................................................................20

SIGNAL CONNECTIONS...............................................21

INPUT COUPLING CAPACITOR

PRECHARGING..............................................................21

INSTRUMENT COOLING

............................................

22

INSTRUMENT FA MILIARIZATIO N

...............................

23

INTRODUCTION

...........................................................

23

EQUIPMENT REQUIRED

............................................

23

NORMAL SWEEP DISPLAY..........................................24

DISPLAYING A SIGNAL...............................................26

OPERATOR'S CHECKS AND ADJUSTMENTS

..............

36

INTRODUCTION

...........................................................

36

TRACE ROTATION

......................................................

36

PROBE COMPENSATION

............................................

37

ASTIGMATISM..............................................................38

VERTICAL GAIN CHECK

............................................

39

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TABLE OF CONTENTS (cont)

Page

BASIC APPLICATIONS.......................................................40

NONDELAYED MEASUREMENTS

.............................

40

AC Peak-to-Peak Voltage

..........................................

40

Instantaneous DC Voltage..........................................42

Algebraic A d d ition

....................................................

43

Common-Mode Rejection..........................................45

Time Duration............................................................46

Frequency

...................................................................

48

Rise Tim e

...................................................................

48 Time Difference Between Two Time-Related Pulses

....................................................

50

Phase Difference

.........................................................

51

Amplitude Comparison

...............................................

53

Time Comparison.......................................................55

DELAYED-SWEEP MAGNIFICATION

........................

57

Magnified Sweep Runs After Delay

...........................

57

Pulse Jitter Time Measurement

..................................

59

Triggered Magnified Sweep

.......................................

60

DELAYED-SWEEP TIME MEASUREMENTS

..............

60

Time D uration............................................................61

Page

Rise T im e....................................................................61

Time Difference Between Repetitive Pulses

..........

63 Time Difference Between Two Time-Related Pulses

....................................................

65

DMM DISPLAYS AND MEASUREMENTS

................

67

Resistance....................................................................67

RMS A C ......................................................................67

DC Volts......................................................................68

OPTIO NS..............................................................................69

OPTION 0 3 ......................................................................69

SPECIFICATION

.................................................................

70

ACCESSORIES......................................................................99

STANDARD ACCESSORIES INCLUDED

...................

99

OPTIONAL POWER CORDS

..........................................

99

APPENDIX A .......................................................................100

CHANGE INFORMATION

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LIST OF ILLUSTRATIONS

Figure Page

The 2337 Oscilloscope...........................................................................................................................viii

1 LINE VOLTAGE SELECTOR switch, line fuse, and power c ord

......................................................

3

2 Optional power cords.................................................................................................................................5

3 Power and display controls and indicators.............................................................................................7

4 Vertical controls, connectors, and indicators and calibrator output....................................................8

5 Horizontal controls and indicator..........................................................................................................10

6 A TRIGGER controls, connector, and indicator.................................................................................13

7 DMM and B TRIGGER controls, connectors, and LCD readout........................................................16

8 Rear-panel connectors............................................................................................................................19

9 Graticule measurement m arkings..........................................................................................................20

10 Initial setup for instrument familiarization procedure.........................................................................27

11 Probe compensation..................................................................................................................................38

12 Vertical display accuracy.......................................................................................................................39

13 Peak-to-peak waveform voltage.............................................................................................................41

14 Instantaneous voltage measurement.....................................................................................................43

15 Algebraic addition...............................................................................< .................................................45

16 Common-mode rejection.........................................................................................................................46

17 Time duration...........................................................................................................................................47

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Fig 18

19

20

21

22

23 24 25 26 27

LIST OF ILLUSTRATIONS (cont)

Page

Rise tim e...................................................................................................................................................49

Time difference between two time-related pulses................................................................................51

Phase difference......................................................................................................................................53

High-resolution phase difference.............................................................................................................53

Delayed-sweep magnification..................................................................................................................58

Pulse jitter................................................................................................................................................59

Time duration using delayed sweep....................................................................................................... 62

Rise time, differential time method....................................................................................................... 63

Time difference between repetitive pulses...........................................................................................64

Time difference between two time-related pulses

................................................................................

66

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LIST OF TABLES

Table Page

1 Line Voltage and Fuse Selection..............................................................................................................4

2 Option 03 Line Voltage and Fuse Selection..........................................................................................4

3 DMM Autoranging................................................................................................................................... 17

4 Equipment Required for Instrument Familiarization Procedure........................................................24

5 Electrical Characteristics.........................................................................................................................72

6 Environmental Characteristics...............................................................................................................95

7 Physical Characteristics........................................................................................................................... 97

8 Option Electrical Characteristics............................................................................................................98

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OPERATORS SAFETY SUMMARY

The general safety information in this part o f the summary is for both operating and servicing personnel. Specific warnings

and cautions w ill be found throughout the manual where they apply and do not appear in this summary.

Terms in This Manual

CAUTION statements identify conditions or practices that could result in damage to the equipment or other property.

WARNING statements identify conditions or practices that could result in personal injury or loss of life.

Terms as Marked on Equipment

CAUTION indicates a personal injury hazard not

immediately accessible as one reads the markings, or a

hazard to property, including the equipment itself.

DANGER indicates a personal injury hazard immedi ately accessible as one reads the marking.

Symbols in This Manual

A

This symbol indicates where applicable

cautionary or other information is to be found. For maximum input voltage see Table 5.

Symbols as Marked on Equipment

DANGER — High voltage.

Protective ground (earth) terminal.

ATTENTION — Refer to manual.

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Power Source

This product is intended to operate from a power source that does not apply more than 250 volts rms between the supply conductors or between either supply conductor and ground. A protective ground connection by way of the grounding conductor in the power cord is essential for safe operation.

Grounding the Product

This product is grounded through the grounding con ductor of the power cord. To avoid electrical shock, plug the power cord into a properly wired receptable before connecting to the product input or output terminals. A

protective ground connection by way of the grounding

conductor in the power cord is essential for safe operation.

Danger Arising From Loss of Ground

Upon loss of the protective-ground connection, all

accessible conductive parts (including knobs and controls that may appear to be insulating) can render an electric shock.

Use the Proper Power Cord

Use only the power cord and connector specified for

your product.

Use only a power cord that is in good condition.

For detailed information on power cords and con

nectors see Figure 2.

Use the Proper Fuse

To avoid fire hazard, use only a fuse of the correct type,

voltage rating and current rating as specified in the parts

list for your product.

Do Not Operate in Explosive Atmospheres

To avoid explosion, do not operate this product in an explosive atmosphere unless it has been specifically certified for such operation.

Do Not Remove Covers or Panels

To avoid personal injury, do not remove the product

covers or panels. Do not operate the product without the covers and panels properly installed.

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INTRODUCTION

The TEKTRONIX 2337 Oscilloscope is a rugged, light

weight, dual-channel, 100-MHz instrument with a general-

purpose digital multimeter (DMM). It also features a

compact crt that provides sharply defined traces. The

vertical system supplies calibrated deflection factors from 5 mV per division to 5 V per division. Sensitivity can be increased to at least 2 mV per division by the variable VOLTS/DIV VAR control. Trigger circuits enable stable triggering over the full bandwidth of the vertical system. The horizontal system provides calibrated sweep speeds from 0.5 s per division to 50 ns per division, along with delayed-sweep features, thus accommodating accurate

relative-time measurements. A X10 magnifier circuit extends the maximum sweep speed to 5 ns per division when the SEC/DIV switch is set to 0.05 ps.

A 3 1/2-digit LCD (liquid crystal display) readout enables rapid measurement of time difference between any two points on the oscilloscope display.

The DMM portion measures dc voltage, resistance, and true rms ac voltage. Measurement values are displayed on

the LCD readout, together with polarity, overrange, and function indicators.

The instrument is shipped with the following standard

accessories:

2 Probe packages

1 Accessory pouch 1 Operators manual 1 Service manual 1 Accessory pouch, zip lock 1 Crt filter, clear plastic

2 1,0-A AGC fast-blow fuses

1 0.5-A AGC fast-blow fuse 1 Pair test leads

For part numbers and further information about both standard and optional accessories, refer to the "Acces sories" page at the back of this manual. Your Tektronix representative or local Tektronix Field Office can also provide accessories information.

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PREPARATION FOR USE

Refer to the Safety Summary at the front of this manual for power source, grounding, and other safety considera tions pertaining to the use of the 2337. Before connecting the instrument to a power source, read the following infor mation, then verify that the LINE VOLTAGE SELECTOR switch is properly set for the ac power source being used and that the proper power-input fuse is installed.

This instrument may be damaged if operated with the LINE VOLTAGE SELECTOR switch set for the wrong applied ac power input source voltage or if the wrong line fuse is installed.

LINE VOLTAGE SELECTION

The 2337 operates from either a 115-V or a 230-V nominal ac power input source with a line frequency ranging from 48 Hz to 440 Hz. Before connecting the power cord to a power input source, verify that the LINE VOLTAGE SELECTOR switch, located on the rear panel (see Figure 1), is set for the correct nominal ac power input source voltage. To convert the instrument for operation from one line-voltage range to the other, move the LINE VOLTAGE SELECTOR switch to the correct nominal ac source voltage position (see Table 1). If your instrument is equipped with Option 03 (100-V/200-V Power Trans former), use Table 2. The detachable power cord may have

to be changed to match the power source outlet.

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LINE VOLTAG E

SELECTOR SW ITC H

DETACHAB LE

POW ER CO RD

____________

CO RD-SE T-

SEC UR ING

CLAM P

LINE

FUSE

4119-02

Figure 1. LINE VO LTAG E SELECTOR switch, line fuse, and power cord.

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Table 1

Line Voltage and Fuse Selection

LINE FUSE

Line Voltage

Selector Switch

Voltage

Position

Range

Fuse Data

115 V Nominal

100 to 132 V

1.0 A, 250 V, Fast-blow

230 V Nominal

200 to 250 V

0.5 A, 250 V, Fast-blow

Table 2

Option 03 Line Voltage and Fuse Selection

Line Voltage

Selector Switch Voltage

Position Range

Fuse Data

100 V Nominal

90 to 115 V

1.0 A, 250 V, Fast-blow

200 V Nominal

180 to 230 V

0.5 A, 250 V, Fast-blow

To verify that the instrument power-input fuse is of proper value for the nominal ac source voltage, perform the following procedure:

1. Press in the fuse holder cap and release it with a slight counterclockwise rotation.

2. Pull the cap (with the attached fuse inside) out of the fuse holder.

3. Verify proper fuse value (see Tables 1 and 2).

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POWER CORD

This instrument has a detachable, three-wire power cord with a three-contact plug for connection to both the power source and protective ground. Its power cord is secured to the rear panel by a cord-set-securing clamp. The plug protective-ground contact connects (through the power- cord protective grounding conductor) to the accessible metal parts of the instrument. For electrical-shock pro

tection, insert this plug into a power source outlet that has

a properly grounded protective-ground contact.

Instruments are shipped with the required power cord

as ordered by the customer. Available power cord options are illustrated in Figure 2, and their part numbers are listed on the "Accessories" page at the back of this manual.

Contact your Tektronix representative or local Tektronix

Field Office for additional power-cord information.

NOTE

See APPENDIX A at the back of this manual for fur

ther power input information. Figure 2. Optional power cords.

Plug

Configuration

Usage

Nominal

Line-

Voltage

(AC)

Reference Standards

Option #

North

American

120 V/

15A

120 V

ANSI C73.11*h NEMA 5-15-P IEC 83c

Standard

Universal

Euro

240V/

10-16A

240V

CEE (7), II, IV,

V lld

IEC 83c

A1

UK

240V/

13A

240V

BS 1363®

IEC 83c

A2

&

Australian

240V/

10A

240V

ASC 112t A3

North

American

240V /

15A

240V

ANSI C73.201 NEMA 6-15-P IEC 83c

A4

aANSI—American National Standards Institute bNEM A—National Electrical Manufacturer's Association CIEC—International Electrotechnical Commission dCEE—International Commission on Rules for the Approval of

Electrical Equipment

eBS—British Standards Institution fAS—Standards Association of Australia 2931-05

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CONTROLS, CONNECTORS, AND INDICATORS

This section of the manual will familiarize the operator with the location and function of instrument controls, connectors, and indicators.

POWER AND DISPLAY

Refer to Figure 3 for location of items 1 through 8.

Q POWER Switch—Turns instrument power on and off.

Press in for ON; press again for OFF.

(T ) FOCUS Control—Adjusts for optimum display

definition.

(T ) ASTIG Control—Screwdriver control used in con

junction with the FOCUS control to obtain a well- defined display over the entire graticule area. It does

not require readjustment during normal operation

of the instrument.

(T ) INTEN Control—Determines the brightness of the crt

display (has no effect when BEAM FIND switch is pressed in).

(T ) BEAM FIND Switch—When held in, compresses the

display to within the graticule area and provides a visible viewing intensity to aid in locating off-screen displays.

(T ) TRACE ROTATION Control—Screwdriver control

used to align the crt trace with the horizontal grati cule lines.

Internal Graticule—Eliminates parallax viewing error between the trace and graticule lines. Rise-time amplitude measurement points are indicated at the left edge of the graticule.

(T ) SERIALand Mod Slots—TheSERIALsIot is imprinted

with the instrument's serial number. The Mod slot contains the option number that has been installed in the instrument.

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VERTICAL

Refer to Figure 4 for location of items 9 through 19.

(^T) AMPL CAL Connector—Provides a 0.2 V, positive

going square-wave voltage (at approximately 1 kHz) that permits the operator to compensate voltage probes and to check oscilloscope vertical operation.

It is not intended to verify time-base calibration.

® CH 1 OR X and CH 2 OR Y Connectors—Provide for

application of external signals to the inputs of the vertical deflection system or for an X-Y display. In the X-Y mode, the signal connected to the CH 1 OR X connector provides horizontal deflection, and the signal connected to the CH 2 OR Y connector provides vertical deflection.

@ Input Coupling Switches (AC-GND-DC)-Select the

method of coupling input signals to the vertical deflection system.

AC—Input signal is capacitively coupled to the

vertical amplifier. The dc component of the

input signal is blocked. Low-frequency lim it

(—3 dB point) is approximately 10 Hz.

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Figure 3. Power and display controls and indicators.

Figure 4. Vertical controls, connectors, and indicators and calibrator output.

GND—The input of the vertical amplifier is grounded to provide a zero (ground) reference voltage display (does not ground the input signal). Allows precharging the input coupling capacitor.

DC—All frequency components of the input signal are coupled to the vertical deflection system.

(j? ) CH 1 VOLTS/DIV and CH 2 VOLTS/DIV Switches-

Select the vertical deflection factor in a 1-2-5 sequence. VAR control must be in detent to obtain a calibrated deflection factor.

IX PROBE—Indicates the deflection factor selected when using either a IX probe or coaxial cable.

10X PROBE—Indicates the deflection factor selected when using a 10X probe.

(l? ) VAR Controls—Provide continuously variable uncal

ibrated deflection factors between the calibrated settings of the VOLTS/DIV switches when rotated clockwise out of the detent position. Channel 1 VOLTS/DIV VAR control is inoperative when X-Y VERTICAL MODE is selected.

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M4) UNCAL Indicator—LED illuminates to indicate that

either Channel 1 or Channel 2 VOLTS/DIV VAR control is out of calibrated detent (vertical deflection factor is uncalibrated).

VERTICAL MODE Switches—Five push-button switches that select the mode of operation for the vertical amplifier system.

CH 1—Selects only the Channel 1 input signal for display.

ALT—The display alternates between Channel 1 and Channel 2 input signals. The alternation occurs during retrace at the end of each sweep. This mode is useful for viewing both vertical input signals at sweep speeds from 0.2 ms per division to 0.05 ps per division.

CHOP—The display switches between the Channel

1 and Channel 2 input signals during the sweep. The switching rate is approximately 500 kHz. This mode is useful for viewing both Channel 1 and Channel 2 inputs at sweep speeds from 0.5 ms per division to 0.5 s per division.

ADD—Selects the algebraic sum of the Channel 1 and Channel 2 input signals for display.

CH 2—Selects only the Channel 2 input signal for display.

AUTO—Press in both ALT and CHOP buttons.

The A Sweep circuitry automatically selects the

most useful switching method (ALT or CHOP) for dual displays.

X-Y—Press in both CH 1 and CH 2 buttons. The

X-signal is applied through the Channel 1 input connector, and the Y-signal is applied through the Channel 2 input connector.

(j? ) CH 2 INVERT Switch—Inverts Channel 2 display

when button is pressed in. Push button must be pressed in a second time to release it and regain a noninverted display.

(l7 ) POSITION Controls—Determine the vertical position

of the displays on the crt. When X-Y VERTICAL MODE is selected, the Channel 2 POSITION control moves the display vertically (Y-axis), and the Hori zontal POSITION control moves the display hori zontally (X-axis).

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(T?) BW LIMIT Switch—Limits the bandwidth of the

vertical amplifier to approximately 20 MHz when

pressed in. Push button must be pressed a second time to release it and regain full 100-MHz bandwidth operation. Provides a method for reducing inter ference from unwanted high-frequency signals when viewing low-frequency signals.

(fiT) TRIG VIEW Switch-Press in and hold this push

button to display a sample of the signal present in

the A Trigger amplifier (for all A TRIGGER SOURCE switch settings except VERT MODE). All other signal displays are removed while the TRIG VIEW push button is held in.

HORIZONTAL

Refer to Figure 5 for location of items 20 through 26.

(20) B DELAY TIME POSITION-A TIME POSITION

Controls—Select the amount of delay time between start of the A Sweep and start of the B Sweep. Delay time is variable to at least 10 times the A SEC/DIV switch setting. The B DELAY TIME POSITION

(outer knob) controls the reference point when the

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4119 06

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Figure 5. Horizontal controls and indicator.

B TRIGGER SOURCE switch is set to either A TIME or RUN AFTER DLY. The A TIME (inner knob) controls the time-measurement point only when the

B TRIGGER SOURCE switch is set to A TIME. When the time-measurement point is to the left of the

reference point, the LCD readout indicates a negative time difference.

(2?) A AND B SEC/DIV Switches—Selects the sweep

speed for the A and B Sweep generators in a 1-2-5 sequence. The A SEC/DIV switch sets the time

between the B Sweeps (delay time). For calibrated sweep rates, the TIME (PULL) VAR control must be

in the calibrated detent (fully clockwise position).

A SEC/DIV—The A Sweep speed is shown between the two black lines on the clear plastic skirt. This switch also selects the delay time (used in conjunction with the B DELAY TIME POSI

TION control) for delayed sweep operation.

B SEC/DIV—The B Sweep speed is set by pulling the inner knob and rotating it to a setting shown by the white line scribed on the knob. The B Sweep circuit is used for delayed sweep operation only.

(22) TIME (PULL) VAR Control—Provides continuously

variable, uncalibrated A Sweep speeds between SEC/

DIV switch settings to at least 2.5 times the cali brated setting (extends slowest sweep speed to at least 1.25 s per division). To operate this control, pull out the VAR knob and rotate it counterclockwise out of the detent.

(2?) UNCAL Indicator LED—Illuminates to indicate that

the A Sweep speed is uncalibrated when the TIME

(PULL) VAR control is rotated out of the calibrated

detent.

(24) HORIZ MODE Switches-Three push-button switches

that select the mode of operation for the horizontal deflection system.

A—Horizontal deflection is provided by the A Sweep generator at a sweep speed determined by the setting of the A SEC/DIV switch.

A INTEN—Horizontal deflection is provided by the A Sweep generator at a speed determined by the A SEC/DIV switch. The B Sweep generator provides an intensified zone on the display. The

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length of the intensified zone is determined by the setting of the B SEC/DIV switch. The location of the intensified zone is determined by the setting of the B DELAY TIME POSITION-A TIME POSITION controls.

B—Horizontal deflection is provided by the B Sweep generator at a sweep speed determined by the setting of the B SEC/DIV switch. The start of the B Sweep is delayed from the start of the A Sweep by a time determined by the settings of the A SEC/DIV switch and the B DELAY TIME POSITION-A TIME POSITION controls.

(25) X10 MAG Switch—When pressed in, increases the

displayed sweep speed by a factor of 10. Extends fastest sweep speed to 5 ns per division. Push button must be pressed in a second time to release it and regain the XI sweep speed.

(26) POSITION Control—Positions the display hori

zontally in all modes. Provides both coarse and fine control action. Reverse the direction of rotation to actuate fine positioning feature. When X-Y VER TICAL MODE is selected, the Horizontal POSITION control moves the display horizontally (X-axis).

A TRIGGER

Refer to Figure 6 for location of items 27 through 34.

(27) SLOPE Switch—Selects the slope of the signal that

triggers the sweep.

+ (plus)—When push button is released out, sweep is triggered from the positive-going slope of the trigger signal.

— (minus)—When push button is pressed in, sweep is triggered from the negative-going slope of the trigger signal.

(2?) LEVEL Control—Selects the amplitude point on the

trigger signal at which the sweep is triggered. The

LEVEL control is usually adjusted for the desired display after trigger SLOPE, COUPLING, and SOURCE switch settings have been selected.

(29) Trigger Mode Switches—Three push-button switches

that determine the trigger mode for the A Sweep.

AUTO—Permits triggering on waveforms with repetition rates down to approximately 10 Hz.

12 2337 Operators

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Sweep free runs and provides a baseline trace either in the absence of an adequate trigger signal or when the repetition rate of the trigger signal

is below approximately 10 Hz.

NORM—Sweep is initiated when an adequate

trigger signal is applied. In the absence of a trigger

signal, no baseline trace will be present.

SGL SWP—Press in the spring-return push button momentarily to arm the A Sweep circuit for a single sweep display. This mode operates the same as NORM, except only one sweep is displayed for each trigger signal. Another single sweep cannot be displayed until the SGL SWP push button is momentarily pressed in again to reset the A Sweep circuit. This mode is useful for displaying and photographing either nonrepetitive signals or signals that cause unstable conventional displays

(e.g., signals that vary in amplitude, shape, or

time).

(30) TRIG'D-READY Indicator LED—Illuminates when

either AUTO or NORM Trigger Mode is selected to

indicate that the A Sweep is triggered (TRIG'D).

When SGL SWP Trigger Mode is selected, the LED

______

illuminates to indicate that the trigger circuit is

armed (READY) for a single sweep display. Pig<

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ire 6. A TRIGGER controls, connector, and indicator.

^3?) SOURCE Switch—Determines the source of the trig- (33^

ger signals coupled to the input of the trigger circuit.

VERT MODE—The internal trigger source is determined by the signals selected for display by

the VERTICAL MODE switches.

CH 1—The signal applied to the CH 1 input connector is the source of the trigger signal.

CH 2—The signal applied, to the CH 2 input connector is the source of the trigger signal.

LINE—Provides a trigger signal from a sample of the ac-power-source waveform. This trigger source is useful when channel input signals are time related (multiple or submultiple) to the frequency

of the power-input source voltage.

EXT—Permits triggering on signals applied to the External Trigger Input connector (A EXT).

EXT-MO—External trigger signals are attenuated by a factor of 10.

(32) A EXT Connector—Provides a means of applying

external signals to the trigger circuit.

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2337 Operators

(COUPLING Switch—Determines the method used to

couple the trigger signal to the input of the trigger circu it.

AC—Signals above 20 Hz are capacitively coupled, blocking any dc components of the signal. Signals below 20 Hz are attenuated.

LF REJ—Signals are capacitively coupled. The

dc component is blocked, and signals below

approximately 50 kHz are attenuated. This

position is useful for providing a stable display of the high-frequency components of a complex waveform.

HF REJ—Signals are capacitively coupled. The dc component is blocked, and signals below approximately 20 Hz and above approximately 50 kHz are attenuated. This position is useful for providing a stable display of the low-frequency components of a complex waveform.

DC—All components of the signal are coupled to the A Trigger circuitry. This position is useful for displaying low-frequency or low-repetition-rate

signals.

@

(34) TRIG HOLDOFF (PUSH) VAR Control-Provides

continuous control of holdoff time between sweeps. This control improves the ability to trigger on aperi odic signals (such as complex digital waveforms) and increases the minimum holdoff time to at least

2.5 times at any sweep speed.

B TRIGGER

Refer to Figure 7 for location of items 35 through 41.

(35) LEVEL Control—Selects the amplitude point on the

trigger signal at which the sweep is triggered. This control is usually adjusted for the desired display

after Trigger SLOPE and SOURCE switch settings

have been selected.

(36) SOURCE Switch—Determines the mode of operation

for the B Sweep and the signal source for the B

Trigger.

A TIME—Provides two intensified zones on the crt trace for differential time measurements. The time difference between the two intensified zones

is determined by the B DELAY TIME POSITION

and the A TIME POSITION controls. Time differ-

@ 2337 Operators

ence is displayed on the LCD readout in seconds

(s), milliseconds (ms), or microseconds (ps). The LCD readout will display UNCAL when the TIME (PULL) VAR control is out of calibrated detent. With the HORIZ MODE set to A INTEN,

alternation of the reference intensified zone occurs

at the end of each sweep. With the HORIZ MODE set to B, the start of the B Sweep alternates

between the setting of the reference intensified

zone and the setting of the measurement inten

sified zone.

RUNS AFTER DLY—The B Sweep starts immedi ately after the delay time selected by the DELAY TIME POSITION control and is independent of

the B Trigger signal.

VERT MODE—Allows the internal trigger source to be determined by the vertical mode of operation.

CH 1—The signal applied to the CH 1 input con nector is the source of the trigger signal.

CH 2—The signal applied to the CH 2 input

connector is the source of the trigger signal.

EXT—Permits triggering on signals applied to the

External Trigger Input (B EXT) connector.

15

Figure 7. DMM and B TRIGGER controls, connectors, and LCD readout.

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(3?) SLOPE Switch—Selects the slope of the signal that

triggers the sweep.

+ (plus)—Sweep is triggered on the positive-going portion of the trigger signal.

— (minus)—Sweep is triggered on the negative

going portion of the trigger signal.

(38) B EXT Connector—Provides a means of introducing

external signals into the B Trigger Generator.

(39) RANGE/FUNCTION Switch—Selects the function

and the range of values for the DMM when not in the A TIME mode. The LCD readout will indicate the function in which the DMM is operating by displaying AC V, V, or 12.

Each DC, RMS AC, and 12 setting, except the 500V DC and the 350V RMS AC, consists of two internal

(upper and lower) ranges. The internal ranges are fully autoranging within the DMM RANGE selected. See Table 3 for the LCD readout values at which autoranging will occur for each DMM RANGE selected.

Table 3

DMM Autoranging

DOWNRANGE UPRANGE

When LCD When LCD Reads Less Reads More

RANGE

FUNCTION

Than

500 V

DC

NA

200 V

DC 10.0 V

19.99 V

2 V

DC

0.100 V

199.9 mV

350 V

RMS AC

NA

200 V

RMS AC

10.0 V 19.99 V

2 V

RMS AC

0.100 V

199.9 mV

20 M

12

1.00 M12 1.999 M12

200 K

12

1.00 K12

1.999 K12

2 K

12 0.100 K12 199.912

12—Measures resistance from 0 12 to 20 M12 in three ranges.

RMS AC—Measures true rms value of the input signal (20 Hz to 20 kHz) from 0 V to 350 V in

three ranges. The LCD readout will display

REV JAN 1982

2337 Operators

17

UNCAL when the peak-to-peak input voltage is greater than three times the RMS AC range selected.

DC—Measures dc voltage from 0 to 500 V in three ranges.

A TIME—Disconnects the DMM from the LCD readout and allows the instrument to display a digital readout of time difference between any two points on the oscilloscope display.

The maximum safe input voltage is 500 V (dc +

peak ac) between the + (positive) and — (negative)

inputs or between the + and — inputs to ground.

(40) DMM INPUT Connectors—Two banana jacks provide

positive (red) and negative (black) inputs for voltage and resistance measurements.

(4?) Readout-Consists of a 3 1/2-digit LCD unit which is

used to display measurements selected by the RANGE/FUNCTION switch. No polarity indication

is displayed for positive values. Negative polarity indication is automatic for negative values. Decimal point indication is automatic. In an overrange con dition, a "1" will be displayed on the left side of the LCD readout, followed by three blank digits and a decimal point.

REAR PANEL

Refer to Figure 8 for location of items 42 and 43.

(42) GND Connector—Provides direct connection to

instrument chassis ground.

(43) EXT Z AXIS INPUT Connector-Provides a means of

connecting external signals to the Z-Axis amplifier to intensity modulate the crt display. Applied signals do not affect display waveshape. Signals with fast rise time and fall time provide the most abrupt intensity change. Positive-going signals decrease

the intensity, and a 5-V p-p signal will produce

noticeable modulation. Z-axis signals must be time- related to the display to obtain a stable presentation on the crt.

18

2337 Operators

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EXT I AX IS IN PUT IQ Kft 25V PEAK MAX POSITIVE GOMG W U T DECREASES IN TEN SITY 5V P P CAUSES NOTKEABIE MODULATIO N AT NORMAL INTENSITY

CAUTION

OO NOT REMOVE COVERS REFER SERVICING TO OUAUEIEO PERSONNEL

FOR CONTINUED FIRE PROTECTION. REPIACE ONLY W ITH S PEOK O TYPE AMO RATED FUSE DISCONNECT POWER INPUT BEFORE REPLACING FUSE

NOMINAL RANGE FUSE gO V

i;$v_

a w a o v o-s a fa s t

POWER MAX WATTS 80

MAX VA n

FREQ 48440Hf

TEKTRONIX. INC. BEAVERTON OREGON. U S A

4119-09

Figure 8. Rear-panel connectors.

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OPERATING CONSIDERATIONS

This section contains basic operating information and techniques that should be considered before attempting any measurements.

GRATICULE

The graticule is internally marked on the faceplate of the crt to enable accurate measurements without parallax error (see Figure 9). It is marked with eight vertical and ten

horizontal major divisions. In addition, each major division is divided into five subdivisions. The vertical deflection factors and horizontal timing are calibrated to the graticule so that accurate measurements can be made directly from the crt. Also, percentage marks for the measurement of rise and fall times are located on the left side of the graticule.

GROUNDING

The most reliable signal measurements are made when

the 2337 and the unit under test are connected by a

1ST OR LEFT 11TH OR R IGHT

VERT ICA L VERT ICAL GRATIULE GRATICULE

LINE L IN E /

/ )

( . . .

-

it- • • •

RISE A ND

FALL TIME

ME ASURE ME NT

PERC EN TA GE j'JT *

MA RKE RS ' aK* 1

CENTER

HOR IZON TAL

To a i GRATICULE

K / A L ■ | m r

ICULE LINE

NE 411 9 10

Figure 9. Graticule measurement markings.

20

2337 Operators

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common reference (ground lead) in addition to the signal

lead or probe. The probe's ground lead provides the best grounding method for signal interconnection and ensures the maximum amount of signal-lead shielding in the probe cable. A separate ground lead can also be connected from

the unit under test to the oscilloscope GND connector

located on the rear panel.

SIGNAL CONNECTIONS

Probes

Generally, probes offer the most convenient means of connecting an input signal to the instrument. They are shielded to prevent pickup of electromagnetic interference, and the supplied 10X probe offers a high input impedance that minimizes circuit loading. This allows the circuit under test to operate with a minimum of change from the normal condition of the circuit when measurements are being made.

Coaxial Cables

Cables may also be used to connect signals to the input connectors, but they may have considerable effect on the accuracy of a displayed waveform. To maintain the original

frequency characteristics of an applied signal, only high- quality, low-loss coaxial cables should be used. Coaxial cables should be terminated at both ends in their char acteristic impedance. If this is not possible, use suitable impedance-matching devices.

INPUT COUPLING CAPACITOR

PRECHARGING

When the input coupling switch is set to GND, the input signal is connected to ground through the input coupling capacitor in series with an 800-k£2 resistor to form a pre charging network. This network allows the input coupling capacitor to charge to the average dc-voltage level of the signal applied to the probe. Thus, any large voltage transients that may accidentally be generated will not be applied to the amplifier input when input coupling is switched from GND to AC. The precharging network also provides a measure of protection to the external circuitry by reducing the current levels that can be drawn from the external circuitry during capacitor charging.

The following procedure should be used whenever the probe tip is connected to a signal source having a different

@ 2337 Operators

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dc level than that previously applied, especially if the dc-

level difference is more than 10 times the VOLTS/DIV

switch setting:

4. Connect the probe tip to the signal source.

1. Set the AC-GND-DC switch to GND before connect

ing the probe tip to a signal source.

5. Wait several seconds for the input coupling capacitor

to charge.

NO TE

The outer shells of the A EXT, CH 1 OR X, and CH 2 OR Y connectors are attached to the 2337 chassis ground.

6. Set the AC-GND-DC switch to AC. The display will remain on the screen, and the ac component of the signal can be measured in the normal manner.

2. Touch the probe tip to the oscilloscope chassis

ground.

INSTRUMENT COOLING

3. Wait several seconds for the input coupling capacitor

to discharge.

To maintain adequate instrument cooling, the ventila

tion holes on both sides of the equipment cabinet must

remain free of obstructions.

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INSTRUMENT FAMILIARIZATION

INTRODUCTION

The procedures in this section are designed to assist you in quickly becoming familiar with the 2337. They provide information which demonstrates the use of all the controls, connectors, and indicators and will enable you to effi ciently operate the instrument.

Before proceeding with these instructions, verify that the LINE VOLTAGE SELECTOR switch is placed in the proper position and that the correct line fuse is installed for the available ac-power-input source voltage. Refer to the "Preparation for Use" instructions in this manual for this information. Verify that the POWER switch is OFF (push button out), then plug the power cord into the ac- power-input-source outlet.

If during the performance of these procedures an

improper indication or instrument malfunction is noted, first verify correct operation of associated equipment. Should the malfunction persist, refer the instrument to qualified service personnel for repair or adjustment.

EQUIPMENT REQUIRED

The equipment listed in Table 4, or the equivalent, is

required to complete these familiarization procedures for

the 2337.

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2337 Operators 23

NORMAL SWEEP DISPLAY

Table 4

Equipment Required for Instrument

Familiarization Procedure

First obtain a Normal Sweep Display (baseline trace),

using the following procedure.

Description

Minimum Specification

Calibration Generator

Standard-amplitude accuracy, ±0.25%; signal amplitude, 2 mV to 50 V; output signal, 1-kHz square wave. Fast-rise

repetition rate, 1 to 100 kHz; rise time, 1 ns or less; signal amplitude, 100 mV to 1 V; aberrations, ±2%.

Dual-Input

Coupler

Connectors, bnc female-to-dual-bnc male.

Cable

(2 required)

Impedance, 50 £2; length, 42 in.;

connectors, bnc.

Adapter

Connectors, bnc female-to-bnc female.

Termination

Impedance, 50 £1; connectors, bnc.

1. Preset the instrument front-panel controls as follows:

Display

INTEN

ASTIG FOCUS

Vertical (both CH 1 and

AC-GND-DC VOLTS/DIV VOLTS/DIV VAR

VERTICAL MODE CH 2 INVERT BW LIMIT

POSITION

Fully counterclockwise (minimum)

Midrange

CH 2 if applicable)

AC 50 m (IX) Calibrated detent (fully

counterclockwise)

Select CH 1 Off (push button out) Not limited (push button

out) Midrange

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2337 Operators

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Horizontal

A AND B SEC/DIV

TIME (PULL) VAR

HORIZ MODE X10 MAG POSITION B DELAY TIME

POSITION

A TIME POSITION

Locked together at 0.5 ms Pull out the VAR knob and

set it to the calibrated detent

(fully clockwise), then push

in the VAR knob. Select A Off (push button out) Midrange

Fully counterclockwise

Midrange

B Trigger

SLOPE + (up)

LEVEL Midrange

SOURCE A TIME

DMM

RANGE/FUNCTION A TIME

2. Press in the POWER switch button (ON) and allow

the instrument to warm up for 20 minutes.

3. Adjust the INTEN control for desired display

brightness.

A Trigger

4. Adjust the Vertical and Horizontal POSITION

controls to center the trace on the screen.

SLOPE

LEVEL Trigger Mode COUPLING SOURCE TRIG HOLDOFF

(PUSH) VAR

+ (push button out) Midrange Select AUTO AC VERT MODE

Fully clockwise and pushed in

NOTE

Normally, the resulting trace will be parallel with the center horizontal graticule line and should not require adjustment. If trace alignment is required, see the " Trace Rotation" adjustment procedure under "Operator's Checks and Adjustments."

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DISPLAYING A SIGNAL

After obtaining a Normal Sweep Display (baseline trace),

you are now ready to connect an input signal and display it on the crt screen.

1. Connect the calibration generator standard-amplitude

output to both the CH 1 and CH 2 inputs as shown in

Figure 10.

2. Set the calibration generator for a standard-amplitude

1-kHz square-wave signal and adjust its output to obtain

a vertical display of 4 divisions.

3. Adjust the Channel 1 POSITION control to center

the display vertically on the screen.

4. Adjust the A TRIGGER LEVEL control for a stable

triggered display.

NOTE

The A TRIGGER TRIG'D-READY light should

illuminate to indicate that the A Sweep is triggered.

5. Rotate the FOCUS control between its maximum clockwise and counterclockwise positions. The display should become blurred on either side of the optimum control setting.

6. Set the FOCUS control for a sharp, well-defined display over the entire trace length. If a well-focused display cannot be obtained, see the "Astigmatism" adjust ment procedure under "Operator's Checks and Adjust ments." The ASTIG adjustment is used in conjunction with the FOCUS control to initially obtain a well-defined display over the entire trace length. Once set, the ASTIG control usually requires little or no adjustment.

7. Move the display off the screen using the Channel 1

POSITION control.

8. Press in and hold the BEAM FIND push button; the display should reappear on the screen. Adjust the Channel 1 and Horizontal POSITION controls to center the trace both vertically and horizontally. Release the

BEAM FIND button; the display should remain within the

viewing area.

9. Adjust the INTEN control counterclockwise until

the display disappears.

26 2337 Operators

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CALIBRATION

GENERATOR

4119-11

Figure 10. Initial setup for instrument familiarization procedure.

@

2337 Operators 27

10. Press in and hold the BEAM FIND push button;

the display should reappear. Release the BEAM FIND

button and adjust the INTEN control to desired display brightness.

Using the Vertical Section

1. Set the Channel 1 AC-GND-DC switch to GND.

2. Adjust the trace to the center horizontal graticule

line.

3. Set the Channel 1 AC-GND-DC switch to DC.

4. Observe that the bottom of the display remains at

the center horizontal graticule line (ground reference).

5. Set the Channel 1 AC-GND-DC switch to AC.

6. Observe that the display is centered approximately

at the center horizontal line.

7. Set the CH 1 VOLTS/DIV switch to 0.1 and observe

that a 2-division vertical display appears.

8. Rotate the CH 1 VOLTS/DIV VAR control fully clockwise. Note that the vertical UNCAL light illuminates when the VOLTS/DIV VAR control is out of the calibrated detent.

9. Observe that maximum vertical deflection occurs when the VOLTS/DIV VAR control is fully clockwise.

10. Rotate the CH 1 VOLTS/DIV VAR control fully

counterclockwise to its calibrated detent.

11. Select CH 2 VERTICAL MODE and perform preceding steps 1 through 10 using Channel 2 controls. Performance should be similar to Channel 1.

12. Set both Channel 1 and Channel 2 AC-GND-DC switches to DC. Ensure that both CH 1 and CH 2 VOLTS/ DIV switches are set to 0.1 for 2-division displays.

13. Select ADD VERTICAL MODE and observe that the resulting display is 4 divisions in amplitude. Both Channel 1 and Channel 2 POSITION controls should move the display. Recenter the display on the screen.

28 2337 Operators

14. Press in the CH 2 INVERT push button to invert the

Channel 2 signal.

15. Observe that the display is a straight line, indicating

that the algebraic sum of the two signals is zero.

16. Set the CH 2 VOLTS/DIV switch to 50 m (IX).

17. Observe the 2-division display, indicating that the

algebraic sum of the two signals is no longer zero.

18. Press in the CH 2 INVERT push button again to

release it. Observe a noninverting display having a 6-division

signal amplitude.

19. Select CH 1 VERTICAL MODE and set CH 1

VOLTS/DIV switch to 50 m (IX).

20. Adjust the Channel 1 POSITION control to center

the display on the screen.

21. Set the A TRIGGER SOURCE switch to CH 1.

22. Press in and hold the TRIG VIEW push button. Observe the Channel 1 trigger signal that is present in the A Trigger amplifier.

NOTE

When in the TRIG VIEW mode, a trigger signal is displayed on the crt screen for every A TRIGGER COUPLING switch position and for every A TRIG

GER SOURCE switch position except VERT MODE.

23. Still holding in the TRIG VIEW push button, rotate

the A TRIGGER LEVEL control between its maximum

clockwise and counterclockwise positions.

24. Observe that maximum signal amplitude and most stable display occurs when the displayed signal is at the approximate center of the graticule area.

25. Release the TRIG VIEW button and set the A

TRIGGER COUPLING switch to AC. Note that a normal

display is regained.

26. Set both Channel 1 and Channel 2 AC-GND-DC

switches to GND.

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2337 Operators

29

27. Position Channel 1 trace two divisions above the

center graticule line.

28. Select CH 2 VERTICAL MODE and position the Channel 2 trace two divisions below the center graticule line.

29. Select ALT VERTICAL MODE and rotate the A SEC/DIV switch throughout its range. The display will alternate between channels at all sweep speeds. This mode is most useful for sweep speeds from 0.05 ns to 0.2 ms per division.

30. Select CHOP VERTICAL MODE and rotate the A SEC/DIV switch throughout its range. A dual-trace display will be presented at all sweep speeds, but unlike the ALT

mode, both Channel 1 and Channel 2 signals are displayed for each sweep speed on a time-shared basis. This mode is most useful for sweep speeds from 0.5 ms to 0.5 s per division.

31. Set the A TRIGGER SOURCE switch to VERT

MODE.

32. Observe the switching between Channel 1 and Channel 2 at the higher sweep speeds (indicated by the segmented trace).

33. Select AUTO VERTICAL MODE by simultaneously pressing in both ALT and CHOP push buttons.

34. Rotate the A SEC/DIV switch throughout its range. Note that a dual-trace display is present at all sweep speeds.

35. Select CH 1 VERTICAL MODE and set Channel 1

AC-GND-DC switch to DC. Recenter the display on the

screen.

Using the Horizontal Section

1. Return the A SEC/DIV switch to 0.5 ms and note

the display for future comparison in step 3.

2. Set the A SEC/DIV switch to 5 ms and press in the

X10 MAG push button.

3. Observe that the display is similar to that obtained in step 1.

30 2337 Operators

@

4. Rotate the Horizontal POSITION control throughout

its range. Observe that the display can be positioned off

the screen horizontally with X I0 MAG selected.

11. Observe that the sweep rate is approximately 2.5

times slower than in step 9, as indicated by more cycles

displayed on the screen.

5. Press in the X10 MAG push button again to release

it for X I sweep.

12. Return the TIME (PULL) VAR control to its cali

brated detent (fully clockwise) and push in the knob.

6. Return the A and B SEC/DIV switches to 0.5 ms.

Using the A Trigger Section

7. Rotate the TRIG HOLDOFF (PUSH) VAR knob out

of detent to its maximum counterclockwise position.

1. Rotate the A TRIGGER LEVEL control between its maximum clockwise and counterclockwise positions. The display will free-run near each lim it of rotation. Observe that the TRIG'D-READY light illuminates only when the display is triggered.

8. Observe that the crt trace becomes dimmer as the

holdoff between sweeps is increased.

2. Adjust the A TRIGGER LEVEL control for a stable

display.

9. Return the TRIG HOLDOFF (PUSH) VAR control to its calibrated detent (fully clockwise). Note the display for future comparison in step 11.

3. Press in the A TRIGGER SLOPE push button to the — (minus) position. Observe that the display starts on the negative-going slope of the applied signal.

10. Pull out the TIME (PULL) VAR knob and rotate the control out of detent to its maximum counterclockwise position.

4. Press in the A TRIGGER SLOPE push button again

to release it to the + (plus) position. Observe that the

@ 2337 Operators

31

display starts on the positive-going slope of the applied signal.

5. Select the A TRIGGER NORM mode.

6. Rotate the A TRIGGER LEVEL control between its maximum clockwise and counterclockwise positions. Observe that the display is presented when correctly triggered.

7. Set the A TRIGGER COUPLING switch to DC and the A TRIGGER SOURCE switch to VERT MODE.

8. Rotate the Channel 1 POSITION control until the display becomes unstable. Note that changing the vertical POSITION control setting affects the dc trigger level with the A TRIGGER SOURCE switch set to VERT MODE.

9. Adjust the Channel 1 POSITION control to center the display on the screen.

10. Set the A TRIGGER COUPLING switch to AC and

the A TRIGGER SOURCE switch to CH 1.

11. Remove the calibration signal from the CH 1 input

connector.

12. Press in the A TRIGGER SGL SWP push button

momentarily for single-sweep operation.

13. Observe that the TRIG'D-READY light illuminates, indicating that the A trigger circuit is armed (READY) for a single-sweep display. No display should be present on the crt screen.

14. Reconnect the calibration signal to the CH 1 input connector. A single sweep of the applied signal should appear on the screen. When the TRIG'D-READY light is out, another single sweep cannot be displayed until the SGL SWP button is pressed in again to reset the A Trigger circuit.

15. Select the A TRIGGER AUTO mode and set the A TRIGGER SOURCE switch to EXT.

16. Remove the calibration signal from the CH 2 input connector and connect it to the A EXT input connector.

32 2337 Operators

@

17. Set the Channel 1 VOLTS/DIV switch to 0.5 (IX) and adjust the output of the calibration generator to pro vide a 4-division display. Adjust the A TRIGGER LEVEL control for a stable display.

18. Set the A TRIGGER SOURCE switch to EXT -5- 10.

19. Observe that adjustment of the A TRIGGER LEVEL control provides a triggered display over a narrower

range than in preceding step 17, indicating trigger-signal

attenuation.

Using the Delayed-Sweep Controls

1. Remove the calibration signal from the A EXT input

connector and connect it to the CH 2 input connector.

2. Set the A TRIGGER SOURCE switch to VERT MODE and adjust the A TRIGGER LEVEL control for a stable display.

3. Set B SEC/DIV switch to 0.1 ms and select the A INTEN HORIZ MODE. Ensure that the B TRIGGER SOURCE switch is set to A TIME.

4. Observe that two intensified zones, approximately

1 division in length, appear on the display.

5. Rotate both the B DELAY TIME POSITION control (reference point) and the A TIME POSITION control (measurement point) throughout their ranges; the inten

sified zones move continuously across the display as the controls are rotated.

6. Observe that the time difference between the start of the reference intensified zone and the start of the measurement intensified zone is displayed on the LCD Readout.

7. Select the B HORIZ MODE and observe that the

intensified zones, previously viewed with A INTEN selected,

are displayed on the crt screen.

8. Rotate both the B DELAY TIME POSITION and the A TIME POSITION controls and observe that both displays move continuously across the crt screen.

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2337 Operators

33

9. Select the A INTEN HORIZ MODE and set the

B TRIGGER SOURCE switch to RUNS AFTER DLY.

Instead of two intensified zones, there is now only one intensified zone. This intensified zone can be continuously positioned on the screen by adjusting only the B DELAY

TIME POSITION control. The LCD readout is disabled.

Using the B Trigger Section

1. Set the B SEC/DIV switch to 1 ms and set the B

TRIGGER SOURCE switch to VERT MODE.

2. Rotate the B DELAY TIME POSITION control throughout its range and observe that the intensified zone appears to jump between positive slopes of the display.

3. Set the B TRIGGER SLOPE switch to - (minus) and observe that the intensified portion begins on the negative slope. Return the B DELAY TIME POSITION control to its fully counterclockwise position.

4. Rotate the B TRIGGER LEVEL control and observe that the intensified zone of the display disappears when this control is out of triggerable range. Readjust the B TRIGGER LEVEL control for a stable display.

5. Select the B HORIZ MODE and rotate the B DELAY TIME POSITION control clockwise. Observe that the length of the display decreases.

6. Operation with the B TRIGGER SOURCE switch set to CH 1, CH 2, or EXT is similar to operation with the B TRIGGER SOURCE switch set to VERT MODE.

Using the X-Y Mode

1. Set both the CH 1 and CH 2 VOLTS/DIV switches

to 1 (IX) and adjust the generator output to provide a

5-division display.

2. Select X-Y VERT MODE by simultaneously pressing in the CH 1 and CH 2 push buttons.

3. Increase the INTEN control setting until two dots are displayed diagonally. This display can then be posi tioned horizontally with the Horizontal POSITION control and vertically with the Channel 2 POSITION control. Note that the dots are separated by 5 horizontal divisions and 5 vertical divisions.

34 2337 Operators

@

4. Set both the CH 1 and CH 2 VOLTS/DIV switches

to 2 (IX). Note that the dots are now separated by 2 1/2

horizontal divisions and 2 1/2 vertical divisions.

5. Select CH 1 VERTICAL MODE and adjust the

INTEN control for normal brightness.

Using the Z-Axis Input

1. Disconnect the dual-input coupler from the CH 2 input connector and connect a bnc female-to-bnc female adapter to the disconnected end of the coupler.

2. Connect a 42-inch, 50-£2 bnc cable from the Z-AXIS INPUT connector (located on the rear panel) to the dual input coupler via the bnc female-to-bnc female adapter.

3. Set the Channel 1 VOLTS/DIV switch to 1 (IX) and adjust the output of the calibration generator to provide a 5-division display.

4. Observe that the positive peaks of the waveform are

blanked, indicating intensity modulation (adjust INTEN

control as necessary).

5. Disconnect the 50-J2 bnc cable from the Z-AXIS

INPUT connector and disconnect the dual-input coupler

from the CH 1 input connector.

Using the Bandwidth Limit Switch

1. Connect a fast-rise + output calibration signal through a 42-inch, 50-£2 cable and a 50-£2 termination to the CH 1 input connector.

2. Set the CH 1 VOLTS/DIV switch to 50 (IX) and

adjust the calibration generator output to provide a 4-

division display.

3. Set the A SEC/DIV switch to 0.5 [is and adjust the

calibration generator fast-rise + output signal frequency to

1 MHz. Adjust the generator amplitude to provide approxi

mately 5 cycles of the displayed signal.

4. Press in the BW LIMIT push button and observe the rounding-off of the front corners of the display. This indicates a decrease in the frequency response of the

vertical amplifier.

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2337 Operators

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OPERATOR'S CHECKS AND ADJUSTMENTS

INTRODUCTION TRACE ROTATION

To verify the operation and accuracy of your instru

ment, perform the following check and adjustment pro

cedures before making a measurement. If adjustments are

required beyond the scope of these operator's checks and adjustments, refer the instrument to a qualified service technician for calibration. Before proceeding with these

instructions, verify that the LINE VOLTAGE SELECTOR switch is placed in the proper position and that the correct

line fuse is installed for the ac-power-in put source voltage to be used. Refer to the "Preparation for Use" information

in this manual for procedures relating to ac-power-in put source voltage and fuse selection. Verify that the POWER switch is OFF (push button out), then plug the power cord

into the ac-power-input source outlet. Push in the POWER switch (ON) to apply power to the instrument and allow sufficient time for warm-up before starting these checks and adjustments. Warm-up time required to meet all the

instrument's specification is 20 minutes.

1. Preset instrument controls and obtain a Normal

Sweep Display (refer to "Instrument Familiarization").

2. Use the Channel 1 POSITION control to move the

baseline trace to the center horizontal graticule line.

NOTE

Normally, the resulting trace will be parallel to the

center horizontal graticule line, and the Trace

Rotation adjustment should not be required.

3. If the resulting trace is not parallel to the center horizontal graticule line, use a small-bladed screwdriver to adjust the TRACE ROTATION control (see Figure 3) and align the trace with the center horizontal graticule line.

36

2337 Operators @

PROBE COMPENSATION

Misadjustment of probe compensation is one of the sources of measurement error. Most attenuator probes are equipped with compensation adjustments. To ensure optimum measurement accuracy, always compensate the oscilloscope probe before making measurements. Probe compensation is accomplished as follows:

1. Preset instrument controls and obtain a Normal

Sweep Display (refer to "Instrument Familiarization").

2. Connect the two 10X probes (supplied with the

instrument) to the CH 1 and CH 2 input connectors.

3. Set both VOLTS/DIV switches to 0.5 m and set

both AC-GND-DC switches to DC.

4. Select CH 1 VERTICAL MODE and insert the tip of the probe connected to the Channel 1 input connector to the AMPL CAL output.

5. Using the approximately 1-kHz AMPL CAL square- wave signal as the input, obtain a display of the signal (refer to "Instrument Familiarization").

6. Set the A SEC/DIV switch to display several cycles of the AMPL CAL signal. Use the Channel 1 POSITION control to vertically center the display.

7. Check the waveform presentation for overshoot and rolloff (see Figure 11). If necessary, adjust the probe compensation for flat tops on the waveforms. Refer to the instructions supplied with the probe for details of com pensation adjustment.

8. Select CH 2 VERTICAL MODE and connect the

Channel 2 probe tip to the AMPL CAL output.

9. Use the Channel 2 POSITION control to vertically

center the display and repeat step 7 for the Channel 2

probe.

10. Disconnect the probes from the instrument.

@ 2337 Operators 37

Figure 11. Probe compensation.

2. Set:

Channel 1 AC-GND-DC DC

INTEN Visible display

3. Connect a 10X probe to the Channel 1 input con

nector and connect the probe tip to the AMPL CAL output.

4. Adjust the Channel 1 POSITION control to center

the display on the screen.

5. Adjust the A TRIGGER LEVEL control for a stable

display of the AMPL CAL signal.

6. Slowly adjust the FOCUS control to its optimum setting (best defined display). If the ASTIG adjustment is correctly set, all portions of the trace will come into sharpest focus at the same position of the FOCUS control.

ASTIGMATISM

1. Preset instrument controls and obtain a Normal

Sweep Display (refer to "Instrument Familiarization").

NOTE

The setting of the ASTIG adjustment should be

correct for any display. However, it may be necessary

to reset the FOCUS control slightly when the INTEN control setting is changed.

38 2337 Operators

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7. If focusing is not uniform over the entire graticule 6. Adjust the Channel 1 POSITION control to vertically area, use a small-bladed screwdriver to adjust the ASTIG center the display, control (see Figure 3).

8. Since the ASTIG and FOCUS adjustments interact, repeat steps 6 and 7 for the best defined display over the entire crt graticule area.

VERTICAL GAIN CHECK

1. Preset instrument controls and obtain a Normal

Sweep Display (refer to "Instrument Familiarization").

2. Set:

AC-GND-DC (both) DC

3. Connect a 10X probe to the Channel 1 input con nector and connect the probe tip to the AMPL CAL output.

4. Adjust the INTEN control for desired brightness and adjust the FOCUS control for best defined display.

5. Adjust the A TRIGGER LEVEL control for a stable

display of the AMPL CAL signal.

7. Check for a vertical display amplitude of 4 divisions

±0.2 division (3.8 to 4.2 divisions). See Figure 12.

8. Repeat steps 3 through 7 using Channel 2.

0

r

t '

4 DIV

±0.2 DIV

♦

1

i- •

411 5-1 8

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Figure 12. Vertical display accuracy.

BASIC APPLICATIONS

After becoming familiar with all the capabilities of the 2337 Oscilloscope, the operator can then adopt a con venient method for making a particular measurement. The following information describes the recommended pro

cedures and techniques for making basic measurements with your instrument. When a procedure first calls for presetting instrument controls and obtaining a Normal Sweep Display, refer to the "Instrument Familiarization" section and perform steps 1 through 4 under "Normal Sweep Display."

NONDELAYED MEASUREMENTS

AC Peak-to-Peak Voltage

To perform a peak-to-peak voltage measurement, use the

following procedure:

NO TE

This procedure may also be used to make voltage

measurements between any two points on the waveform.

1. Preset instrument controls and obtain a Normal

Sweep Display.

2. Apply the ac signal to either vertical-channel input connector and set the VERTICAL MODE switch to display the channel used.

3. Set the appropriate VOLTS/DIV switch to display about five divisions of the waveform, ensuring that the VOLTS/DIV VAR control is in the calibrated detent.

4. Adjust the A TRIGGER LEVEL control to obtain a stable display.

5. Set the A SEC/DIV switch to a position that displays several cycles of the waveform.

6. Vertically position the display so that the negative peak of the waveform coincides with one of the horizontal

graticule lines (see Figure 13, Point A).

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2337 Operators

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7. Horizontally position the display so that one of the

positive peaks coincides with the center vertical graticule

line (see Figure 13, Point B).

8. Measure the vertical deflection from peak to peak

(see Figure 13, Point A to Point B).

NOTE

If the amplitude measurement is critical or if the

trace is thick (as a result o f hum or noise on the signal), a more accurate value can be obtained by measuring from the top of a peak to the top of a

valley. This w ill eliminate trace thickness from the measurement.

9. Calculate the peak-to-peak voltage, using the follow

ing formula:

vertical VOLTS/DIV probe

Volts (p-p) = deflection x switch x attenuation

(divisions) setting factor

EXAMPLE: The measured peak-to-peak vertical deflec tion is 4.6 divisions (see Figure 13) with a VOLTS/DIV switch setting of 0.5, using a 10X probe.

Substituting the given values:

Volts (p-p) = 4.6 div x 0.5 V/div x 10 = 23 V.

Operators 41

Figure 13. Peak-to-peak waveform voltage.

NOTE

Instantaneous DC Voltage

To measure the dc level at a given point on a waveform,

use the following procedure:

1. Preset instrument controls and obtain a Normal

Sweep Display.

2. Apply the signal to either vertical-channel input connector and set the VERTICAL MODE switch to display the channel used.

3. Verify that the VOLTS/DIV VAR control is in the

calibrated detent and set the AC-GND-DC switch to GND.

4. Vertically position the baseline trace to the center

horizontal graticule line.

5. Set the AC-GND-DC switch to DC. If the waveform moves above the centerline of the crt, the voltage is positive. If the waveform moves below the centerline of the

crt, the voltage is negative.

If using Channel 2, ensure that the CH 2 INVERT

switch is in its noninverting mode (push button out).

6. Set the AC-GND-DC switch to GND and position the baseline trace to a convenient reference line, using the Vertical POSITION control. For example, if the voltage to be measured is positive, position the baseline trace to the bottom graticule line. If a negative voltage is to be

measured, position the baseline trace to the top graticule line. Do not move the Vertical POSITION control after this reference line has been established. The ground refer ence line can be checked at any later time by switching the AC-GND-DC switch to GND.

7. Set the AC-GND-DC switch to DC.

8. If the voltage-level measurement is to be made with

respect to a voltage level other than ground, apply the reference voltage to the unused vertical-channel input connector. Then position its trace to the reference line.

9. Adjust the A TRIGGER LEVEL control to obtain

a stable display.

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2337 Operators

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10. Set the A SEC/DIV switch to a position that displays 12. Calculate the instantaneous voltage, using the follow-

several cycles of the signal. ing formula:

11. Measure the divisions of vertical deflection between the reference line and the desired point on the waveform at which the dc level is to be determined (see Figure 14).

Instantaneous

Voltage

vertical , .

deflection x P° ant^

, .. . . , (+ or - )

(divisions)

VOLTS/DIV

x switch x

setting

probe

attenuation

factor

EX A M P LE : The measured vertical deflection from the

reference line is 4.6 divisions (see Figure 14), the wave form is above the reference line, the VOLTS/DIV switch is set to 2, and a 10X attenuator probe is being used.

Substituting the given values:

Instantaneous Voltage = 4.6 div x (+1) x 2 V/div

x 10 = 92 V.

Algebraic Addition

With the VERTICAL MODE switch in the ADD posi

tion, the waveform displayed is the algebraic sum of the

signals applied to the Channel 1 and Channel 2 inputs

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Figure 14. Instantaneous voltage measurement.

(CH 1 + CH 2). If the CH 2 INVERT push button is pressed in, the waveform displayed is the difference between the

signals applied to the Channel 1 and Channel 2 inputs

(CH 1 — CH 2). The total deflection factor in the ADD mode is equal to the deflection factor indicated by either VOLTS/DIV switch (when both VOLTS/DIV switches are

set to the same deflection factor). A common use for the

ADD mode is to provide a dc offset for a signal riding on

top of a high dc level.

The following general precautions should be observed

when using the ADD mode.

a. Do not exceed the input voltage rating of the oscillo

scope.

b. Do not apply signals that exceed the equivalent of

about eight times the VOLTS/DIV switch settings, since large voltages may distort the display. For example, with a VOLTS/DIV switch setting of 0.5, the voltage applied to that channel should not exceed approximately 4 volts.

c. Use Channel 1 and Channel 2 POSITION control

settings which most nearly position the signal on each

channel to midscreen when viewed in either CH 1 or CH 2 VERTICAL MODE. This ensures the greatest dynamic range for ADD mode operation.

d. To attain similar response from each channel, set

both the Channel 1 and Channel 2 AC-GND-DC switches to the same position.

EXAMPLE: Using the graticule center line as 0 V,

the Channel 1 signal is at a 3-division, positive dc level

(see Figure 15A).

1. Multiply 3 divisions by the VOLTS/DIV switch

setting to determine the dc-level value.

2. To the Channel 2 input connector, apply a negative dc level (or positive level, using the CH 2 INVERT switch) whose value was determined in step 1 (see Figure 15B).

3. Select ADD VERTICAL MODE to place the resultant display within the operating range of the vertical POSITION controls (see Figure 15C).

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2337 Operators

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/

7

!

7 7

1 1 1

POSITIVE LEVE L

1

,i. .

1

■

:

__

90

___

NEGA TIVE OFFSET

1

;

___

(A) CHANNEL 1 SIGNAL

WITH 3 D IVIS IONS OF POSITIVE DC LEVEL.

(B) CHANNEL 2 DISPLAY

WITH 3 DIVISIO NS OF NEGA TIVE OFFSET.

(C) RESULTANT DISPLAY

46 5 /D M -0 -1

Figure 15. Algebraic addition.

Common-Mode Rejection

The ADD mode can also be used to display signals that contain undesirable frequency components. These undesir able components can be eliminated through common-mode

rejection. The precautions given under the preceding "Algebraic Addition" procedure should be observed.

EXAMPLE: The signal applied to the Channel 1 input

connector contains unwanted ac-input-power-source

frequency components (see Figure 16A). To remove the undesired components, use the following procedure:

1. Preset instrument controls and obtain a Normal Sweep Display.

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CH 1 SIGNAL WITH UNWANTED LINE FREQUENCY '«

COMPONENT *

CH 2 SIGNAL ,,

FROM LINE

FREQUENCY

SOURCE

(INVERTED)

tot

9C

SIGNAL WITH

LINE FREQUENCY

COMPONENT

CANCELED

OUT

K

.-*r

*

—

>

y

S

*

*— *•»

\

>

_

r

....

(A) C

H 1 AND CH 2 SIGNALS.

....

'1 .

__ „

__

....

(8) RESULTANT SIGNAL. 173S-19

2. Apply the signal containing the unwanted line- frequency components to the Channel 1 input.

3. Apply a line-frequency signal to the Channel 2 input.

4. Select ALT VERTICAL MODE and press in the CH 2 INVERT push button.

5. Adjust the Channel 2 VOLTS/DIV switch and VAR

control so that the Channel 2 display is approxi mately the same amplitude as the undesired portion of the Channel 1 display (see Figure 16A).

6. Select ADD VERTICAL MODE and slightly readjust

the Channel 2 VOLTS/DIV VAR control for maxi

mum cancellation of the undesired signal component (see Figure 16B).

Time Duration

To measure time between two points on a waveform, use

the following procedure:

1. Preset instrument controls and obtain a Normal

Sweep Display.

2337 Operators

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46

Figure 16. Common-mode rejection.

2. Apply the signal to either vertical-channel input connector and set the VERTICAL MODE switch to display the channel used.

EXAMPLE: The distance between the time-measurement points is 8 divisions (see Figure 17), and the A SEC/DIV

switch is set to 2 ms. A magnification factor of 1 is used.

3. Adjust the A TRIGGER LEVEL control to obtain a stable display.

4. Set the A SEC/DIV switch to display one complete period of the waveform. Ensure that the TIME (PULL) VAR control is in the calibrated detent.

5. Position the display to place the time-measurement points on the center horizontal graticule line (see Fig ure 17).

6. Measure the horizontal distance between the time-

measurement points.

7. Calculate time duration, using the following formula:

horizontal A SEC/DIV

distance x switch

Time _ (divisions)

_______

setting

Duration magnification factor

Substituting the given values:

Time Duration = 8.3 div x 2 ms/div = 16.6 ms

Figure 17. Time duration.

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Frequency

The frequency of a recurrent signal can be determined

from its time-duration measurement as follows:

1. Measure the time duration of one waveform cycle using the preceding "Time Duration" measurement procedure.

2. Calculate the reciprocal of the time-duration value to

determine the frequency of the waveform.

EXAMPLE: The signal in Figure 17 has a time duration of 16.6 ms.

Calculating the reciprocal of time duration:

Frequency =

-----—-----

:— = ——

-----

= 60 Hz

time duration 16.6 ms

Rise Time

Rise-time measurements use the same methods as time

duration, except that the measurements are made between

the 10% and 90% points on the leading edge of the wave form (see Figure 18). Fall time is measured between the 90% and 10% points on the trailing edge of the waveform.

1. Preset instrument controls and obtain a Normal

Sweep Display.

2. Apply the signal to either vertical-channel input connector and set the VERTICAL MODE switch to display the channel used.

3. Set the A TRIGGER SLOPE switch to + (plus). Use

a sweep-speed setting that displays several complete cycles

or events (if possible).

4. Set the VOLTS/DIV switch and VAR control for an exact 5-division display.

5. Adjust vertical positioning so that the zero reference of the waveform touches the 0% graticule line and the top

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of the waveform touches the 100% graticule line (see

Figure 18).

Substituting the given values in the formula:

6. Set the A SEC/DIV switch for a single-waveform display, with the rise time spread horizontally as much as possible.

Rise Time

5 div x 1 yus/div

1

= 5 /is

7. Horizontally position the display so the 10% point on the waveform intersects the second vertical graticule

line (see Figure 18, Point A).

8. Measure the horizontal distance between the 10% and 90% points and calculate the time duration using the following formula:

horizontal SEC/DIV

distance x switch

_. (divisions) setting Rise Time =

-------------

—— :— -

------------

magnification factor

EXAMPLE: The horizontal distance between the 10% and 90% points is 5 divisions (see Figure 18), and the A SEC/DIV switch is set to 1 /ts/division. A magnification factor of 1 is used.

Figure 18. Rise time.

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Time Difference Between Two Time-Related Pulses

The calibrated sweep speed and dual-trace features of the 2237 allow measurement of the time difference between two separate events. To measure time difference, use the following procedure:

1. Preset instrument controls and obtain a Normal

Sweep Display.

2. Set the A TRIGGER SOURCE switch to CH 1.

3. Set both AC-GND-DC switches to the same position,

depending on the type of coupling desired.

4. Using either probes or cables with equal time delays, connect a known reference signal to the Channel 1 input and the comparison signal to the Channel 2 input.

5. Set both VOLTS/DIV switches for 4- or 5-division displays.

6. Select either ALT or CHOP VERTICAL MODE, depending on the frequency of input signals (or select AUTO VERTICAL MODE if automatic selection is desired).

7. If the two signals are of opposite polarity, press in the CH 2 INVERT push button to invert the Channel 2 display (signals may be of opposite polarity due to 180° phase difference; if so, note this for use later in the final calculation).

8. Adjust the A TRIGGER LEVEL control for a stable display.

9. Set the A TIM E/DIV switch to a sweep speed which provides three or more divisions of horizontal separation between the reference points on the two displays. Center each of the displays vertically (see Figure 19).

10. Measure the horizontal difference between the two signal reference points and calculate the time difference using the following formula:

SEC/DIV horizontal

switch x difference

Time _ setting

______

(divisions)

Difference magnification factor

EXAMPLE: The A SEC/DIV switch is set to 50 /is,

the X10 MAG switch is pressed in and the horizontal

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difference between waveform measurement points is 4.5 divisions.

Substituting the given values in the formula:

Time _ 50 ps/div x 4.5 div _

Difference 10

Phase Difference

In a similar manner to "Time Difference," phase com parison between two signals of the same frequency can be made using the dual-trace feature of the 2337. This method of phase difference measurement can be used up to the frequency lim it of the vertical system. To make a phase comparison, use the following procedure:

CHA NN EL 1 (REFERENC E) CH ANN EL 2

Figure 19. Time difference between two time-related pulses.

1. Preset instrument controls and obtain a Normal Sweep Display, then set the A TRIGGER SOURCE switch to CH 1.

2. Set both AC-GND-DC switches to the same position,

depending on the type of coupling desired.

3. Using either probes or coaxial cables with equal time delays, connect a known reference signal to the Channel 1 input and the unknown signal to the Channel 2 input.

4. Select either ALT or CHOP VERTICAL MODE, depending on the frequency of the input signals (or select AUTO VERTICAL MODE if automatic selection is desired). The reference signal should precede the comparison signal

in time.

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51

5. If the two signals are of opposite polarity, press in the CH 2 INVERT push button to invert the Channel 2 display.

6

. Set both VOLTS/DIV switches and both VAR

controls so the displays are equal in amplitude.

graticule line (50% of rise time) and calculate the phase difference using the following formula:

Phase

Difference

horizontal

difference

(divisions)

horizontal

graticule

calibration

(deg/div)

7. Adjust the A TRIGGER LEVEL control for a stable display.

EXAMPLE: The horizontal difference is 0.6 division with a graticule calibration of 45° per division as shown in Figure 20.

8

. Set the A SEC/DIV switch to a sweep speed which

displays about one full cycle of the waveforms.

9. Position the displays and adjust the TIME (PULL) VAR control so that one reference-signal cycle occupies exactly 8 horizontal graticule divisions at the 50% rise-time points (see Figure 20). Each division of the graticule now represents 45° of the cycle (360° t 8 divisions), and the horizontal graticule calibration can be stated as 45° per division.

10. Measure the horizontal difference between corre

sponding points on the waveforms at a common horizontal

Substituting the given values into the phase difference

formula:

Phase Difference = 0.6 div x 45° /div = 27°

More accurate phase measurements can be made by using the X I0 MAG function to increase the sweep rate without changing the SEC/DIV TIME (PULL) VAR control setting.

EXAMPLE: If the sweep rate were increased 10 times

with the magnifier (X10 MAG push button in), the magnified horizontal graticule calibration would be 45° per division divided by 10 (or 4.5° per division).

52

2237 Operators

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CH ANN EL 1 CHA NN EL 2

(REFER EN CE) / (LA GGING )

• • • •

j

'

(IT)

-

/

■/

IT i I

V • • •

1 1 1 1

8 D IVIS IO NS

(36 0°)

ME ASU RE

TIM E FROM

® TO ®

HORIZO NTAL

DIF FER ENCE

411921

CH ANN EL 1 (REFER EN CE )

CHA NNE L 2

MEA SURE

TIM E FR OM

® TO ®

4119-22

Figure 20. Phase difference.

Figure 21. High-resolution phase difference.

Figure 21 shows the same signals illustrated in Figure 20, but magnifying the displays results in a horizontal difference of 6 divisions between the two signals.

Substituting the given values in the phase difference

formula:

Phase Difference = 6 div x 4.5°/div = 27°

Amplitude Comparison

In some applications it may be necessary to establish

a set of deflection factors other than those indicated by

the VOLTS/DIV switch settings. This is useful for com

paring unknown signals to a reference signal of known amplitude. To accomplish this, a reference signal of known

amplitude is first set to an exact number of vertical divisions

by adjusting the VOLTS/DIV switch and VAR control.

53@

2237 Operators

Unknown signals can then be quickly and accurately compared with the reference signal without disturbing the setting of the VOLTS/DIV VAR control. The procedure is as follows.

5. Disconnect the reference signal and apply the unknown signal to be measured to the same channel input. Adjust the VOLTS/DIV switch to a setting that provides sufficient vertical deflection to make an accurate measure ment. Do not readjust the VOLTS/DIV VAR control.

1. Preset instrument controls and obtain a Normal

Sweep Display.

2. Apply the reference signal to either vertical channel

input and set the VERTICAL MODE switch to display the

channel used.

6

. Establish an arbitrary deflection factor, using the

following formula:

Arbitrary vertical VOLTS/DIV

Deflection = conversion x switch

Factor factor setting

3. Set the amplitude of the reference signal to an exact number of vertical divisions by adjusting the VOLTS/DIV 7. Measure the vertical deflection of the unknown signal switch and VOLTS/DIV VAR control. in divisions and calculate its amplitude using the following

formula:

4. Establish a vertical conversion factor, using the following formula (reference signal amplitude must be known):

Unknown

Signal

Amplitude

arbitrary

deflection

factor

vertical

x deflection

(divisions)

Vertical

Conversion

Factor

reference signal amplitude (volts)

vertical VOLTS/DIV deflection x switch (divisions) setting

EXAMPLE: The reference signal amplitude is 30 volts,

with a VOLTS/DIV switch setting of 5 and the VOLTS/

DIV VAR control adjusted to provide a vertical deflec

tion of exactly 4 divisions.

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2237 Operators

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Substituting these values in the vertical conversion factor

formula:

Vertical

Conversion

Factor

30 V

4 div x 5 V/div

1.5

Continuing, for the unknown signal the VOLTS/DIV switch setting is 1 and the peak-to-peak amplitude spans five vertical divisions. The arbitrary deflection factor is then determined by substituting values in the formula:

reference signal (e.g., on assembly line test) may be easily and accurately measured with the 2337. To accomplish this, a reference signal of known time duration is first set to an exact number of horizontal divisions by adjusting the A SEC/DIV switch and the TIME (PULL) VAR control. Unknown signals can then be compared with the reference signal without disturbing the setting of the TIME (PULL) VAR control. The procedure is as follows:

1. Set the time duration of the reference signal to an exact number of horizontal divisions by adjusting the A SEC/DIV switch and TIME (PULL) VAR control.

Arbitrary

Deflection = 1.5 x 1 V/div = 1.5 V/div

Factor

2. Establish a horizontal conversion factor, using the following formula (reference signal time duration must be known):

The amplitude of the unknown signal can then be deter mined by substituting values in the unknown signal ampli tude formula:

Amplitude = 1.5 V/div x 5 div = 7.5 V

Horizontal

Conversion

Factor

reference signal time

duration (seconds)

horizontal A SEC/DIV

distance x switch

(divisions) setting

Time Comparison

In a similar manner to "Amplitude Comparison",

repeated time comparisons between unknown signals and a

3. For the unknown signal, adjust the A SEC/DIV switch to a setting that provides sufficient horizontal deflec tion to make an accurate measurement. Do not readjust the TIME (PULL) VAR control.

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4. Establish an arbitrary deflection factor, using the Substituting the given values in the horizontal conver-

following formual: sion factor formula:

Arbitrary

horizontal ASEC/DIV

Horizontal

2.19 ms

Deflection

= conversion x

switch

Conversion =

Factor

factor

setting

Factor

8

div x

0.2

ms/div

5. Measure the horizontal distance of the unknown signal in divisions and calculate its time duration using the following formula:

Continuing, for the unknown signal the A SEC/DIV switch setting is 50 /is, and one complete cycle spans 7 horizontal divisions. The arbitrary deflection factor is then determined by substituting values in the formula:

Time

Duration

arbitrary

deflection x

factor

horizontal

distance

(divisions)

Arbitrary

Deflection = 1.37 x 50/is/div = 68.5/is/div

Factor

6

. Frequency of the unknown signal can then be deter

mined by calculating the reciprocal of its time duration.

The time duration of the unknown signal can then be computed by substituting values in the formula:

Time _ gg 5 x 7 div = 480 /is/div

Duration

EXAMPLE: The reference signal time duration is

2.19 ms, the A SEC/DIV switch setting is 0.2 ms, and the TIME (PULL) VAR control is adjusted to provide a horizontal distance of exactly 8 divisions.

The frequency of the unknown signal is then calculated:

Frequency = |— = 2.083 kHz

H 1 480/is

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DELAYED-SWEEP MAGNIFICATION

The delayed-sweep feature of the 2337 can be used to provide higher apparent magnification than is provided by the X I0 MAG function. Apparent magnification occurs as

a result of displaying a selected portion of the A trace at a faster sweep speed (B Sweep speed). The A SEC/DIV switch setting determines how often the B trace will be displayed. Since the B Sweep can occur only once for each A Sweep, the A Sweep time duration sets the amount of

time elapse between succeeding B Sweeps.

The intensified zone is an indication of both the location

and length of the B Sweep interval within the A Sweep

interval. Positioning of the intensified zone (i.e., setting

the amount of time between start of the A Sweep and start of the B Sweep) is accomplished with the B DELAY TIME

POSITION control. With either the A INTEN or the B HORIZ MODE selected and with the B TRIGGER

SOURCE switch set to RUNS AFTER DLY, the B DELAY TIME POSITION control provides continuously variable positioning of the start of the B Sweep. The range of this control is sufficient to place the B Sweep interval at any

location within the A Sweep interval. When the A INTEN HORIZ MODE is selected, the B SEC/DIV switch setting

determines the B Sweep speed and concurrently sets the

length of the intensified zone on the A trace.

Using delayed-sweep magnification may produce a

display with some slight horizontal movement (pulse jitter).

Pulse jitter includes not only the inherent uncertainty of

triggering the delayed sweep at exactly the same trigger

point each time, but also jitter that may be present in the input signal. If pulse jitter needs to be measured, use the "Pulse Jitter Time Measurement" procedure which

follows the discussion of "Magnified Sweep Runs After

Delay."

When looking at a signal having pulse jitter, it is often useful to be able to hold that signal stationary on the screen. Operating the B Sweep in a triggered mode will produce a more stable display, since the delayed display is triggered at the same level each time. This capability is

provided by the 2337 and is explained in the "Triggered Magnified Sweep" discussion.

Magnified Sweep Runs After Delay

The following procedure explains how to operate the B Sweep in a nontriggered mode and to determine the resulting apparent magnification factor.

1. Preset instrument controls and obtain a Normal

Sweep Display.

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2. Set the B TRIGGER SOURCE switch to RUNS

AFTER DLV.

3. Apply the signal to either vertical-channel input

connector and set the VERTICAL MODE switch to display

the channel used.

4. Set the appropriate VOLTS/DIV switch to produce a

display of approximately 5 divisions in amplitude and

center the display.

5. Set the A SEC/DIV switch to a sweep speed which

displays at least one complete waveform cycle.

6

. Select the A INTEN HORIZ MODE and adjust the B DELAY TIME POSITION control to position the intensified zone to the portion of the display to be mag

nified (see Figure 22A).

7. Set the B SEC/DIV switch to a setting which inten

sifies the full portion of the A trace to be magnified. The

intensified zone will be displayed as the B trace. The start

of the intensified zone remains as previously positioned in step 6.

58 2237 Operators

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Figure 22. Delayed-sweep magnification.

8

. Select the B HORIZ MODE to magnify the inten

sified portion of the A Sweep (see Figure 22B).

2. Referring to Figure 23, measure the difference

between Point A and Point B in divisions and calculate

the pulse jitter time using the following formula:

9. The apparent sweep magnification can be calculated

from the following formula:

Pulse

Jitter

Time

horizontal

difference x (divisions)

B SEC/DIV

switch setting

Apparent

Delayed Sweep

Magnification

A SEC/DIV switch setting

B SEC/DIV switch setting

EXAMPLE: Determine the apparent magnification of a display with an A SEC/DIV switch setting of 0.1 ms and a B SEC/DIV switch setting of 1

ms-

Substituting the given values:

Apparent 1 x 10

’ 4

s

=

-----------------------------

— = 102 = 100

Magnification 1x10s

Pulse Jitter Time Measurement

1. Perform steps 1 through 8 of the preceding "Mag

nified Sweep Runs After Delay" procedure.

ME ASUR E

TIM E FROM

® TO ®

4119-24

Figure 23. Pulse jitter.

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Triggered Magnified Sweep

The following procedure explains how to operate the B Sweep in a triggered mode and to determine the resulting apparent magnification factor.

1. Perform steps 1 through 8 of the preceding "Mag

nified Sweep Runs After Delay" procedure.

2. Set the B TRIGGER SOURCE switch to the same position to which the A TRIGGER SOURCE switch is set. If external triggering is used, connect the required signal to

the B EXT input connector.

NOTE

The B D ELAY TIME POSITION control w ill not

provide continuously variable delay when the B

TRIGGER SOURCE switch is set to VERT MODE,

CH 1, CH 2, or EXT. Adjustment o f the B DELAY

TIME POSITION control will still position the B Sweep with respect to the A Sweep, bu t the B Sweep will occur only when properly triggered. The inten sified zone seen in the A INTEN HORIZ MODE display will move from trigger point to trigger po in t as the B DELAY TIME POSITION control is rotated.

3. Adjust the B TRIGGER LEVEL control so the inten sified zone on the A trace is stable. If an intensified zone cannot be obtained, see step 4.

4. Inability to intensify the desired portion of the trace

indicates that the signal does not meet the triggering requirements. If the condition cannot be remedied either by using the B Sweep triggering controls or by increasing display amplitude, you should do the following in the sequence indicated: lower the VOLTS/DIV switch setting,

set the B TRIGGER SOURCE switch to EXT and trigger the B Sweep externally, and then reset the VOLTS/DIV switch for the desired display amplitude.

5. The apparent magnification factor can be calculated from the same formula shown in step 9 of the "Magnified Sweep Runs After Delay" procedure.

DELAYED-SWEEP TIME

MEASUREMENTS

Operating the 2337 Oscilloscope with HORIZ MODE set to either A INTEN or B will permit time measurements to be made with a greater degree of accuracy than can

be attained with HORIZ MODE set to A. With the B

TRIGGER SOURCE switch and RANGE/FUNCTION

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2237 Operators

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switch set to A TIME, two intensified zones are displayed

on the crt. The intensified zones consist of a reference point (moved by rotating the B DELAY TIME POSITION control) and a measurement point (moved by rotating the A TIME POSITION control). The time difference between

the reference point and the measurement point is displayed

on the LCD readout. The following procedures describe how these measurements are accomplished.

Time Duration

1. Preset instrument controls and obtain a Normal

Sweep Display.

2. Apply the signal to either vertical-channel input connector and set the VERTICAL MODE switch to display the channel used.

3. Set the appropriate VOLTS/DIV switch to produce a display of approximately 5 divisions in amplitude and center the display.

4. Select the A INTEN HORIZ MODE and set the A SEC/DIV switch to a sweep speed that displays the entire portion of the waveform for which time duration is to be measured.

5. For the most accurate measurements, set the B SEC/

DIV switch to the fastest sweep speed that provides a

usable (visible) intensified zone.

6. Adjust the B DELAY TIME POSITION control to move the start of the reference point so that it just touches the intersection of the signal and the center horizontal graticule line (see Figure 24A, Point A).

7. Adjust the A TIME POSITION control to move the start of the measurement point along the center horizontal graticule line to the beginning of the next waveform cycle

(see Figure 24A, Point B).

8. Press in the B HORIZ MODE push button and adjust the A TIME POSITION control to superimpose the wave forms as shown in Figure 24B.

9. Read the time duration (or waveform period) on the

LCD readout.

Rise Time

Rise-time measurements use the same methods as time

duration, except that the measurements are made between

@

2237 Operators

61

8

r

\

V

3 S

r

b

P

u r c m m ru a c

OR TIONS OF

WAVEFORM H ___1___

1 J

___

__

(B) M A G NIFIED B TRACE

62

Figure 24. Time duration using delayed sweep.

9 25

the 10% and 90% points on the leading edge of the wave

form. Fall time is measured between the 90% and 10% points on the trailing edge of the waveform.

1. Preset instrument controls and obtain a Normal

Sweep Display.

2. Apply the signal to either vertical-channel input connector and set the VERTICAL MODE switch to display the channel used.

3. Set the appropriate VOLTS/DIV switch and VAR

control for an exact 5-division display.

4. Vertically position the trace so that the zero refer ence of the waveform touches the 0% graticule line and the top of the waveform touches the 100% graticule line (see

Figure 25).

5. Set the A SEC/DIV switch for a single-waveform display, with the rise time spread horizontally as much as possible. Ensure that the A SEC/DIV TIME (PULL) VAR control is in the calibrated detent.

2237 Operators

@

6. Horizontally position the display so the 10% point

on the waveform intersects the third vertical graticule line.

7. Select the A INTEN HORIZ DISPLAY and set the

B SEC/DIV switch to the fastest sweep speed that provides

a usable (visible) intensified zone.

Figure 25. Rise time, differential time method.

8. Adjust the B DELAY TIME POSITION control to move the start of the reference point (left-hand edge) until it just touches the intersection of the signal and the

10% graticule line (see Figure 25, Point A).

9. Adjust the A TIME POSITION control to move the start of the measurement point (left-hand edge) until it just touches the intersection of the signal and the 90% graticule line (see Figure 25, Point B).

10. Read the rise time on the LCD readout.

Time Difference Between Repetitive Pulses

1. Preset instrument controls and obtain a Normal

Sweep Display.

2. Apply the signal to either vertical-channel input connector and set the VERTICAL MODE switch to display the channel used.

3. Set the appropriate VOLTS/DIV switch to produce a display of approximately 5 divisions in amplitude and vertically center the display.

@

2237 Operators

63

4. Set the A SEC/DIV switch to display the measure

ment points of interest within the graticule area.

5. Select the A INTEN HORIZ MODE and set the

B SEC/DIV switch to the fastest sweep speed that provides

a usable (visible) intensified zone.

6. Adjust the B DELAY TIME POSITION control to move the reference point to the first pulse (see Figure 26A, Point A).

7. Adjust the A TIME POSITION control to move the measurement point to the second pulse (see Figure 26A, Point B).

8. Press in the B HORIZ MODE push button and adjust the A TIME POSITION control to superimpose the wave forms as shown in Figure 26B.

'1 4 1

TIME

.

r DI

FFE

3EIVCE-

f- i

1

i

>

\

7

— v

\

/

7 "

** 1N 1 tN S I M b U

ZONE

(A) A TRACE

VERTICAL

REFERENCE LINE

•

X

I—

5UP

S)AI

:R I

VID(£

VIPOL

i....

(B) B TRACE

(4 11 5-2 4 ) 4 11 7-26

9. Read the time difference on the LCD readout.

64 2237 Operators

(®

Figure 26. Time difference between repetitive pulses.

Time Difference Between Two Time-Related Pulses

1. Preset instrument controls and obtain a Normal

Sweep Display.

2. Using probes or cables having equal time delays, apply the reference signal to the Channel 1 input and apply the comparison signal to the Channel 2 input.

3. Set both VOLTS/DIV switches to produce a display

of either 4 or 5 divisions in amplitude.

4. Select either ALT or CHOP VERTICAL MODE,

depending on the input frequencies (or select AUTO VERTICAL MODE if automatic selection is desired).

5. Set the A SEC/DIV switch to display the measure

ment points of interest within the graticule area.

6. Select the A INTEN HORIZ MODE and set the

B SEC/DIV switch to the fastest sweep speed that provides

a usable (visible) intensified zone.

7. Adjust the B DELAY TIME POSITION control to

move the reference point to the reference signal (see

Figure 27A, Point A).

8. Adjust the A TIME POSITION control to move the measurement point to the comparison signal (see Figure 27A, Point B).

9. Press in the B HORIZ MODE push button and adjust the B DELAY TIME POSITION and the A TIME POSITION controls to superimpose the reference- and comparison-signal leading edges as shown in Figure 27B.

10. Read the time difference on the LCD readout.

(P>

2237 Operators

65

Figure 27. Time difference between two time-related pulses.

66 2237 Operators

@

DMM DISPLAYS AND

MEASUREMENTS

Before connecting the DMM test leads to a unit-under-

test, select the desired measurement RANGE and

FUNCTION. When the value of the quantity to be

measured is unknown, select the highest range first.

Decrease the range setting until the display reads between 10% and 100% of the full-range value.

Resistance

The DMM may be damaged if it is operating in the resistance mode (SI function selected) and more than 500 V is applied between the + (red) and - (black) inputs.

1. Rotate the RANGE/FUNCTION switch to any

SI range.

The maximum safe input voltage is 500 V (dc + peak ac) between the + (positive) and — (negative) inputs or between the + and — inputs to ground.

If an overrange condition exists, a "1 " will be displayed

on the left side of the LCD readout, followed by three blank digits and a decimal point. Should this occur, select

the next higher RANGE value.

The 500 V DC and 350 V RMS AC RANGE will not

indicate an overrange condition when the input signal exceeds the maximum allowable input voltage.

2. Connect the + (red) and — (black) leads across

the unknown resistance.

3. Select the best SI range to obtain maximum resolu

tion without overranging; read the resistance value on the

LCD readout.

RMS AC

If the LCD readout exceeds 350 V, immediately disconnect the test leads from the unit-under-test to prevent possible instrument damage.

2237 Operators

67

When the peak voltage being measured is greater than three times the RMS AC range selected, UNCAL will be displayed on the LCD readout.

1. Rotate the RANGE/FUNCTION switch to RMS AC

and select 350 V.

2. Connect the — (negative) lead to the reference point (usually a ground or test point) and connect the + (positive) lead to the unknown voltage to be measured.

3. Observe the LCD readout. If necessary, select the

next lower value range to obtain maximum resolution without overranging.

DC Volts

If the LCD readout exceeds 500 V, immediately disconnect the test leads from the unit-under-test to prevent possible instrument damage.

1. Rotate the RANGE/FUNCTION switch to DC and

select 500 V.

2. Connect the — (negative) lead to the reference point

(usually a ground or test point) and connect the + (positive) lead to the unknown voltage to be measured.

3. Observe the LCD readout. If necessary, select the

next lower value range to obtain maximum resolution without overranging.

68

2337 Operators

OPTIONS

INTRODUCTION

There is presently only one option available for the

2337. A brief description of this option is given in the following discussion. For further information about instrument options, see your Tektronix Catalog or contact

your Tektronix Field Office or representative.

OPTION 03

Option 03 (100-V/200-V Power Transformer) permits operation of the instrument from either a 100-V or a 200-V nominal ac-power-input source at a line frequency from

48 Hz to 440 Hz. This option does not affect the basic

instrument operating instructions presented in this manual.

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2337 Operators

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SPECIFICATION

The following electrical characteristics (Table 5) are valid for the 2337 when it has been calibrated at an ambient temperature between +20°C and +30°C, has had a warmup period of at least 20 minutes, and is operating at an ambient temperature between —15°C and +55°C

(unless otherwise noted).

Items listed in the "Performance Requirements" column are verifiable qualitative or quantitative limits, while items listed in the "Supplemental Information" column are either

explanatory notes, calibration setup descriptions, per formance characteristics for which no absolute limits are specified, or characteristics that are impractical to check.

Environmental characteristics of the 2337 are given in Table 6. All environmental tests performed meet the requirements of MlL-T-28800B, Type III, Class 3 equip ment, except where otherwise noted.

Physical characteristics of the instrument are listed in Table 7, and option electrical characteristics are presented in Table 8.

70

2337 Operators

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Table 5

Electrical Characteristics

Characteristics

Performance Requirements

Supplemental Information

VERTICAL DEFLECTION SYSTEM

Deflection Factor

Range

5 mV per division to 5 V per division in a 1, 2, 5 sequence.

Accu racy

±3% on all ranges when VOLTS/DIV is calibrated at 5 mV per division; add

0.05% per °C deviation from 25°C.

Uncalibrated (VAR) Range

Continuously variable between VOLTS/ DIV switch settings. Reduces deflection factor at least 2.5 to 1 on all VOLTS/DIV

switch settings.

Reduces deflection factor to at least 2 mV per division with VOLTS/DIV switch set to 5 mV.

Frequency Response

6-division reference signal from a 25-£2 source; centered vertically, with VOLTS/DIV VAR control in cali brated detent.

— 15°C to +40°C

Dc to at least 100 MHz.

Reduces to 88 MHz at 2 mV per division.3

Performance Requirement not checked in Service Manual.

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Table 5 (cont)

Characteristics

Performance Requirements

Supplemental Information

VERTICAL DEFLECTION SYSTEM (cont)

Frequency Response (cont)

+40° C to +55° C

Dc to at least 85 MHz.3

Reduces to 70 MHz at 2 mV per division.3

Ac Coupled Lower —3 dB Point

IX Probe

10 Hz or less.3

10X Probe

1 Hz or less.3

Step Response

5-division reference signal, dc coupled at all deflection factors, from a 25-J2

source; centered vertically with

VOLTS/DIV VAR control in cali brated detent. BW LIMIT push button must be out for full bandwidth

operation.

Performance Requirement not checked in Service Manual.

<S>

72

2337 Operators

Table 5 (cont)

Characteristics

Performance Requirements

Supplemental Information

VERTICAL DEFLECTION SYSTEM (cont)

Step Response (cont)

Rise Time (5 mV per division to 5 V per division)

— 15° C to +40° C 3.5 ns or less.

Rise time is calculated from the

formula:

, . 350

Rise Time (ns = — . ,

BW (MHz)

+40° C to +55° C 4.15 ns or less.3

Aberrations

Positive-Going Step (Excluding ADD Mode)

5 mV per division to 0.2 V per division

+3%, —3%, 3% p-p or less.

Negative-Going Step

Add 2% to all positive-going step specifications; checked at 5 mV per division.

Performance Requirement not checked in Service Manual.

@ 2337 Operators

73

Table 5 (co nt)

Characteristics

Performance Requirements

Supplemental Information

VERTICAL DEFLECTION SYSTEM (cont)

Aberrations (cont)

ADD Mode

Add 4% to all positive-going step specifications; checked at 5 mV per division.

Position Effect

Total aberrations less than +5%, —5%, 5% p-p; checked at 5 mV per division.

Temperature Effect Add 0.15% per °C deviation to aber

rations specifications from 25 C.

Common-Mode Rejection Ratio

At least 10 to 1 at 50 MHz for common mode signals of 6 divisions or less.

VAR control adjusted for best CMRR at 10 mV per division at 50 kHz;

checked at 10 mV per division.

Channel 2 Invert Trace Shift Less than 0.4 division from center screen

when switching from normal to inverted.

74

2337 Operators

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Table 5 (cont)

Characteristics

Performance Requirements Supplemental Information

VERTICAL DEFLECTION SYSTEM (cont)

Input Gate Current

—15°C to +30°C

0.5 nA or less.

0.1-division trace shift when moving Input Coupling switch from GND to

AC at 5 mV per division.

+30° C to +55° C

4.0 nA or less.3

0.8-division trace shift when moving Input Coupling switch from GND to

AC at 5 mV per division.

Attenuator Isolation (CH 1 to CH 2)

At least 100 to 1.

With one vertical input set at 0.5 V per division, apply 4-V p-p 25-MHz signal;

set the other vertical input to 10 mV per division. Check for less than 4 divisions of signal.

POSITION Control Range

At least +12 and -12 divisions from graticule center.

Performance Requirement not checked in Service Manual.

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Table 5 (cont)

Characteristics

Performance Requirements Supplemental Information

VERTICAL DEFLECTION SYSTEM (cont)

Step Attenuator Balance

Less than or equal to 0.2-division trace shift when rotated from 5 mV per division to 5 V per division.

Double for each 10°C deviation

from 25°C.

Chop Frequency

275 kHz ±30%.

Input Characteristics

Resistance 1 M ft ±2%.a

Capacitance

20 pF ±10%.a

Maximum Input Voltage

DC Coupled 400 V (dc + peak ac) or

500 V p-p ac at 1 kHz or less.3

AC Coupled

400 V (dc + peak ac) or

500 V p-p ac at 1 kHz or less.3

Performance Requirement not checked in Service Manual.

76

2337 Operators

@

Table 5 (cont)

Characteristics Performance Requirements

Supplemental Information

TRIGGER SYSTEM

Sensitivity

With VOLTS/DIV VAR control in calibrated detent.

In E XTt 10, multiply input require

ments by 10.

A TRIGGER

AC Coupled Signal

0.3 division internal or 50 mV external from 20 Hz to 20 MHz; increasing to

1.1 divisions internal or 150 mV external

at 100 MHz.

LF REJ Coupled Signal

0.3 division internal or 50 mV external from 50 kHz ±10 kHz to 20 MHz;

increasing to 1.1 divisions internal or 150 mV external at 100 MHz.

Attenuates signals below 50 kHz ±10 kHz (-3 dB at 50 kHz).

HF REJ Coupled Signal

0.3 division internal or 50 mV external from 20 Hz ±4 Hz to 50 kHz ±10 kHz.

Attenuates signals below 20 Hz ±4 Hz

and above 50 kHz ±10 kHz (—3 dB at 20 Hz and 50 kHz).

DC Coupled Signal

0.3 division internal or 50 mV external from dc to 20 MHz; increasing to

1.1 divisions internal or 150 mV external

at 100 MHz.

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2337 Operators

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Table 5 (cont)

Characteristics

Performance Requirements

Supplemental Information

TRIGGER SYSTEM (cont)

Sensitivity (cont)

B TRIGGER (Ac Coupled Signal)

0.3 division internal or 50 mV external from 30 Hz to 20 MHz; increasing to

1.1 divisions internal or 150 mV external

at 100 MHz.

Trigger Jitter

0.2 division or less at 5 ns per division (X10 MAG on) with 100 MHz applied

and at the rated trigger sensitivity.

VOLTS/DIV VAR control must be in calibrated detent.

External Trigger Inputs

Maximum Input Voltage

400 V (dc + peak ac) or 500 V p-p ac at 1 kHz or less.3

Input Resistance

1 MJ2 ±10%.a

Input Capacitance

20 pF ±30%.a

LEVEL Control Range

EXT

At least ± 1 V, 2 V p-p.

Performance Requirement not checked in Service Manual.

78

2337 Operators

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Table 5 (con t)

Characteristics

Performance Requirements

Supplemental Information

TRIGGER SYSTEM (cont)

LEVEL Control Range (cont)

EXT -r 10

At least ± 10 V, 20 V p-p.a

Trigger View (A Trigger)

Deflection Factor

EXT

100 mV per division ±40%.

EXT t 10

1 V per division ±40%.

Centering of Trigger Point

Within 1 division of center screen.

Bandwidth

To at least 80 MHz. 4-division reference signal from a 25-J2

source; centered vertically.

Delay Difference 3 ns ±2 ns. 5-division signal with 5-ns rise time or

less from 25-S2 source, centered vertically; equal cable length from signal source to vertical channel and external trigger inputs, terminated in 50 at each input.

Performance Requirement not checked in Service Manual.

@

2337 Operators

79

Table 5 (cont)

Characteristics Performance Requirements

Supplemental Information

HORIZONTAL DEFLECTION SYSTEM

Sweep Rate

Calibrated Range

A Sweep

0.5 s per division to 0.05 /is per division in a 1, 2, 5 sequence. X10 MAG extends maximum sweep speed to 5 ns per

division.

B Sweep

50 ms per division to 0.05 jus per division in a 1, 2, 5 sequence. X10 MAG extends maximum sweep speed to 5 ns per division.

Accuracy

+20° C to +30° C

Unmagnified

Magnified

Accuracy specification applies over the full 10 divisions with X10 MAG on and off. Exclude the first and last 40 ns of the sweep on all sweep speeds with X10 MAG on and off.

±2%

±3%

— 15°C to +55°C

±3%a

±4%a

Performance Requirement not checked in Service Manual.

80

2337 Operators

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Table 5 (cont)

Characteristics

Performance Requirements

Supplemental Information

HORIZONTAL DEFLECTION SYSTEM (cont)

Linearity

±5%.

Over any 2-division portion of the full

10 divisions, displayed at all sweep speeds. Exclude the first and last dis played divisions of the 5- and 10-ns per division sweep speeds with X10 MAG on.

Variable Range (VAR)

Continuously variable between calibrated settings of the SEC/DIV switches.

Extends maximum A Sweep speed to at least 1.25 s per division.

A Sweep Length

10.5 to 11.5 divisions.

Checked at 1 ms per division.

A Trigger Holdoff (VAR)

At least 2.5 times the minimum holdoff at any sweep speed.3

Magnifier Registration ±0.2 division from graticule center (X10

MAG on to X10 MAG off).

POSITION Control Range

Start of sweep must position to right of graticule center. End of sweep must position to left of graticule center.

Checked at 1 ms per division.

Performance Requirement not checked in Service Manual.

@

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81

Table 5 (cont)

Characteristics

Performance Requirements

Supplemental Information

HORIZONTAL DEFLECTION SYSTEM (cont)

Differential Time Measurement Accuracy

+15°C to +35° C ±1% of reading ±1 count.

Exclude delayed operation when knobs are locked at any sweep speed

or when the A SEC/DIV switch is at

either 0.1 /us per division or 0.05 /us per division. Exclude the first 0.25

division on all A Sweep speeds.

—15°C to +55°C

±2.5% of reading ±1 count.8

Delay Time Jitter

±0.005% of 10 times the A SEC/DIV

switch setting (less than one part in

20,000) over the full delay time range.

X-Y OPERATION

Deflection Factor Range

5 mV per division to 5 V per division in a 1, 2, 5 sequence.

No X-axis variable.

Performance Requirement not checked in Service Manual.

82

2337 Operators

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Table 5 (cont)

Characteristics

Performance Requirements

Supplemental Information

X-Y OPERATION (cont)

Bandwidth

X-Axis

Dc to at least 2 MHz.

Y-Axis

Dc to at least 100 MHz.

Input Characteristics

Resistance

1 M fi ±2%.a

Capacitance

20 pF ±10%.a

Phase Difference Between X- and Y-Axis Amplifiers

< 3° from dc to 200 kHz.

Accuracy

X-Axis

0°C to +40° C

±5% of indicated deflection.

— 15° C to +55° C

±8% of indicated deflection.3

Performance Requirement not checked in Service Manual.

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2337 Operators

83

Table 5 (cont)

Characteristics

Performance Requirements

Supplemental Information

CALIBRATOR

Waveshape

Positive-going square wave.

Duty Cycle

50% ±10%.

Output Voltage

0°C to +40° C

0.2 V±1%.

— 15°C to +55°C 0.2 V±1.5%.a

Repetition Rate

1kHz ±25%.

Output Impedance

200 £2 ±1%.

Performance Requirement not checked in Service Manual.

84

2337 Operators

@

Table 5 (cont)

Characteristics

Performance Requirements

Supplemental Information

Z-AXIS INPUT

Sensitivity 5 V p-p signal referenced to ground causes

noticeable modulation of display at normal intensity.

Positive-going signal decreases intensity; negative-going signal increases intensity.

Usable Frequency Range

Dc to 20 MHz.

Input Resistance

10 kJ2 ±6%.

Input Capacitance

Less than 15 pF.

Maximum Input Voltage

±25 V (dc + peak ac) for dc to 10 MHz.a

For frequencies greater than 10 MHz, use the following formula to calculate the maximum input voltage.3

V (dc + peak ac) = —^ -

f (MHz)

Input Coupling

Dc.

Performance Requirement not checked in Service Manual.

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2337 Operators

85

Tektronix 2337 Instruction Manual

Specifications and Main Features

Frequently Asked Questions

User Manual