Tektronix 305 DMM Instruction Manual

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Tfektronix

305 DMM

OSCILLOSCOPE

OPERATORS

INSTRUCTION MANUAL

Tektronix. Inc.

P.0. Box 500 Beaverton. Oregon 97077

070-2424-00

Tektronix

COMMITTED TO EXCELLENCE

PLEASE CHECK FOR CHANGE INFORMATION AT THE REAR

OF THIS MANUAL

305 DMM

OSCILLOSCOPE

OPERATORS

INSTRUCTION MANUAL

First Printing JUL 1978

Serial Number

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

Revised JUL 1981

Products of Tektronix, Inc. and its subsidiaries are covered by U.S. and foreign patents and/or pending patents.

TEKTRONIX, TEK. SCOPE-MOBILE, andf^?* are registered trademarks of Tektronix, Inc. TELEQUIPMENT is a registered trademark of Tektronix U.K Limited.

Printed in U.S A. Specification and price change privileges are reserved.

TABLE OF CONTENTS

Page

LIST OF ILLUSTRATIONS ii LIST OF TABLES

iii

GENERAL INFORMATION

ADJUSTMENT AND BASIC DISPLAY

Introduction

Oscilloscope Display

Safety Information

Digital Multimeter Display

Operating Voltage

APPLICATION AND MEASUREMENTS

Internal Battery Operation

Battery Charging

Instantaneous Amplitude Measurements-DC

Battery Care

Peak-to-Peak Amplitude Measurement-AC

Voltage Comparison Measurements

CONTROLS AND CONNECTORS

Time Duration And Frequency Measurement

Power Source And Connectors

Time Difference Measurement Between Two

Calibrator And Display Controls 8

Pulse Waveforms From Different Sources

Vertical Controls 8

Dual Trace Phase Difference Measurements

Horizontal Controls

High Resolution Phase Difference Measurement

Triggering And Sweep Controls 12

Rise Time Measurement

Digital Multimeter Controls

Common Mode Rejection

BASIC INSTRUMENT OPERATION

SPECIFICATION

Operating Considerations 15

Electrical Characteristics

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LIST OF ILLUSTRATIONS

Page

Figure 1. Description of power source operation.

Figure 13. Example of peaktopeak voltage

Figure 2. View of rear cover.

measurement.

Figure 3.

Right side view of instrument cabinet. 7 Figure 14. Example of time duration and frequency

Figure 4. Left side view of instrument cabinet.

7 measurement

Figure 5. Location of display and calibrator controls.

Figure 15. Time difference between two pulses from

Figure 6. Location o f vertical deflection system

different sources. 27

controls. 10

Figure 16. Example of dual trace phase difference

Figure 7. Location of horizontal deflection system measurement. 28

controls.

Figure 17. Example of high resolution phase difference

Figure 8.

Location of trigger and sweep controls.

measurement. 30

Figure 9. Location of digital multimeter controls.

Figure 18. Example of rise time measurement. 31

Figure 10. Probe compensation.

Figure 19. Common mode rejection of an undesired

Figure 11.

Location of external operator adjustments.

line frequency.

Figure 12. Example of instantaneous voltage measure

ment with VOLTS/DIV set at 10M position. 23

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LIST OF TABLES

Page

TABLE 1. Battery charge related to operating tem

perature and charging temperature. 5

TABLE 2. Electrical Characteristics 33

305 Operators iii

305 DMM Oscilloscope

305 Operators

GENERAL INFORMATION

INTRODUCTION

The Sony/Tektronix 305 DMM Oscilloscope is a versatile solid-state (except crt> portable instrument that combines small size and light weight with the ability to make preci sion waveform and digital measurements associated with industrial, military, computer maintenance, and business machine applications. The 305 is mechanically constructed to withstand shock, vibration and other environmental extremes associated with portability. Operating power for the instrument is provided by external dc, rechargeable batteries, or normal power-line voltage. Internal circuitry recharges the batteries whenever the instrument is connect

ed to power-line voltage. Selection of the DMM or oscil

loscope function (or both} is made with front panel push buttons.

The DMM is autoranging and measures resistance, ac voltage and dc voltage. Full scale measurements are 2 meg ohms, 700 Vac and 1000 Vdc. The front panel digital read out is a 3

-Vi digit display containing an automatic negative polarity indicator and decimal point locator. No polarity indication is shown for positive measurements. Input con nectors for the multimeter are located on the right side of the instrument cabinet.

Oscilloscope functions provide dual-channel, dc to 5 megahertz vertical deflection with calibrated deflection factors of 5 millivolts/division to 10 volts/division in a 1-2- 5 sequence. The horizontal deflection system provides cali brated sweep rates from 0.5 second to 1 microsecond per

division. A X10 magnifier increases the indicated sweep rate

by a factor of ten, extending the fastest sweep rate of 0.1

microsecond/division. The trigger input may be internal or external, with triggering effective over the full bandwidth of the vertical deflection system. Calibrated X-Y measure ments are made with Channel 2 (Y) providing the vertical deflection and Channel 1 (X) horizontal deflection. Oscil loscope signal input connectors are located on the left side of the instrument cabinet The crt display is an 8 X 10 di

vision graticule with each division measuring 0.632 centi

meters (approximately 0.25 inches).

SAFETY INFORMATION

This operating manual contains information which the user must follow to ensure safe operation of the instru ment. Warning information is intended to protect the operator while Caution information protects the instrument.

REV A SEP 1979 305 Operators 1

WARNING

High voltage is present inside this instrument. To avoid electric-shock hazard, operating personnel must not remove the protective instrument cover. Component replacement and internal ad

justments must be made by qualified personnel

only.

In the ac power source mode, the 305 DMM Oscillo scope operates from a single phase power source, which has one of its current carrying conductors at ground (earth) potential. Operation from other power sources where both current carrying conductors are live with respect to ground (such as phase-to-phase on a multi-phase three wire system I is not recommended because only the line conductor has over-current (fuse) protection w ithin the instrument.

This instrument has a 3-wire power cord with a 3- contact plug for connection to the power source and to protective ground. The plug protective-ground contact con nects (through the cord protective grounding conductor) to the accessible metal parts of the instrument. For electric- shock protection, insert this plug into a socket outlet that has a securely grounded protective-ground contact.

L)o not defeat the grounding connection. Any interrup tion of the grounding connection can create an electric- shock hazard. Before making external connections to this instrument, always ground the instrument first by connect ing the power cord to a proper mating power outlet, that is known to be properly grounded.

OPERATING VOLTAGE

This instrument may operate from an external dc source,

rechargeable batteries (supplied with the instrument), or a

115 or 230 volt ac nominal line voltage.

External DC Power Source Operation

The 305 can operate from an external dc power source of +9 to +32 volts. Set the Power Source Selector switch to the EXT DC position (Figure 1). Apply external dc voltage to the two banana jack inputs using the cable assembly supplied with the instrument.

Internal Battery Power Source Operation

To operate the instrument from the internal battery source, set the Power Source Selector switch to the BAT TERY position (Figure 1). Battery voltage is indicated on the DMM digital readout when all DMM FUNCTION push buttons are in the out position.

305 Operators

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E A i c k n hl

ia .

rvmen suunv-c urcnmiun

AC L IN t V U L I A lib H A N lit IN UIC A I U K

a ) INDICATES NOMINAL AC INPUT VOLTAGE (116 OR

> < 230 V) FROM WHICH INSTRUMENT MAY BE

B ) OPERATED.

POWER SOURCE SELECT SWITCH OPERATES 305 FROM AC OR EXT DC POWER

SOURCE WITH FULL CHG APPLIED TO INTERNAL BATTERIES.

OPERATES FROM AC OR EXT DC POWER SOURCE WITH TRICKLE CHG APPLIED TO BATTERIES.

OPERATES 305 FROM INTERNAL BATTERY POWER SOURCE AC POWER SOURCE OPERATION

CHECK THAT THE AC LINE VOLTAGE RANGE INDICATOR DISPLAYS THE NOMINAL AC LINE

VOLTAGE AVAILABLE I115 OR 230 V AC).

SET THE POWER SOURCE SELECT SWITCH TO AC, FULL OR TRICKLE CHG.

WARNING I

WHEN OPERATING FROM EXTERNAL DC OR

INTERNAL BATTERIES THE INSTRUMENT GROUND CONNECTOR MUST BE CONNECTED TO A PROTECTIVE EARTH GROUND.

SET THE POWER SOURCE SELECT SWITCH TO ONE OF THE EXT DC POSITIONS.

APPLY EXTERNAL DC POWER SOURCE h9 TO

♦ 32 V DC) TO THE BANANA JACK INPUT.

BATTERY POWER SOURCE OPERATION SET THE POWER SOURCE SELECT SWITCH TO

BATTERY POSITION. _________

IWUtiMM

’ C t i U T M iU i

ocron<i«oti*cc

(2423 0712424 26

Figure 1. Description o f power source operation.

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305 Operators

WARNING I

Change o f ac voltage must be accomplished by qualified service personnel.

AC Power Source Operation

The AC Input Voltage Selector switch permits the 305 to be operated from a 115 or 230 volt ac nominal line volt age source, at 48 to 440 hertz I Figure 1) The Power Source Selector switch must be set to the proper AC position. The ac line voltage fuse must be changed when selecting a dif ferent nominal line voltage. Any fuse change requires re moval of the instrument cabinet and must be accomplished by qualified service personnel.

INTERNAL BATTERY OPERATION

WARNING I

Change or replacement of batteries must be accom plished by qualified service personnel

I ne jud teatures oattery operation irom six recuarye- able nickel-cadmium cells (1.2 volts each, total nominal voltage of 7.2 Vdc). The operating time of the internal batteries depends upon display intensity, state of battery charge, discharge temperatures, and the instrument function being used; oscilloscope, DMM, or both. When the instru ment is operated at +20°C to +303C (+C8 F to +86°F), the typical operating time of fully charged batteries with both oscilloscope and DMM in operation is approximately

1.6 hours.

A light-emitting diode (LED), labeled 'ON (FLASHES WHEN LOW)', is steadily illuminated to indicate that the instrument oscilloscope function is on, and the battery charge is sufficient for operation. When battery charge is low, the LED flashes on and off indicating that batteries require recharge or possible replacement. An automatic battery over-discharge protection circuit will turn the instru ment off to prevent excessive discharge, which could result in permanent battery damage.

During DMM operation, the digital readout alternates between a normal display a nd---------------if the power source voltage drops too low for proper DMM operation.

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BATTERY CHARGING

TABLE 1

To apply full charge to the batteries, connect the instru ment to a power line, turn SCOPE POWER and DMM POWER off, switch the Power Source Selector switch to AC FULL CHG position, and allow at least 16 hours for the batteries to become fully charged. To obtain the longest Operating life for the batteries, the instrument should be turned on at least once a month and the batteries dis charged to where the oscilloscope SCOPE POWER LED flashes, and then recharged for 24 hours. This procedure

balances the charge on the batteries and reduces the

possibility of any cell becoming reverse charged The

instrument may be operated while batteries are being

charged.

The energy capacity of nickel-cadmium cells varies with

the temperature at which they are charged and operated.

Table 1 shows the percentage of full charge capacity at various charging and operating temperatures.

Battery charge related to

operating temperature and charging temperature.

Charging Operating Temperature

Temperature -1 5° C +20° to +25" C

♦55s C

0°C

40%

60%

50%

♦20° to +25° C

65%

100%

85%

*40° C 40%

65%

55%

BATTERY CARE

Nickel cadmium cells will self-discharge when the instru ment is not used often or stored for extended periods of time. The rate of self-discharge is dependent upon tempera ture and humidity. When the instrument is to bo stored for extended periods of time, particularly at high temperature or humidity, the batteries should be charged for at least

16 hours every two weeks, or leave the 305 connected to a power line with the Power Selector switch set to AC TRICKLE CHG position.

<®

305 Operators

CONTROLS AND CONNECTORS

Controls and connectors necessary for proper operation of the instrument are located on the front, side, and rear cabinet panels. To make full use of the capabilities of this instrument, the operator should be familiar with the func tion and use of each external control and connector. A brief description and use of each external control and con nector is given herein

POWER SOURCE AND CONNECTORS

WARNING |

Change o f ac input voltage must be accom plished by qualified service personnel only.

1. Power Source Selector switch-Three position switch provides operator selection of ac line voltage, external dc voltage or battery operation. The ac position, in conjunc tion with the AC Input Voltage Selector switch, allows the 305 to be operated over a range of ac line voltages. Power Source Selector switch also provides operator selection of a Full or Trickle charge rate to internal batteries (Figure 21.

2. AC Input Voltage Selector switch-In conjuction with the Power Source Selector switch, allows the instru ment to be operated from 115 or 230 nominal ac line voltage (Figure 2).

Figure 2. View of rear cover.

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REV A SEP 1979

3. + and - Inputs for applying external dc power

source {+9 to +32 volts! {Figure 3).

4. DMM INPUT-Connector to apply external voltages

or resistance to be measured to the digital multimeter

(Figure 3).

5. Ground Connector-Connector for common ground connection from the power source or associated instruments or devices under test {Figure 3).

6. CHI (X) INPUT-BNC connector to apply an external signal to the input of the CHI vertical system, or X-axis deflection {horizontal) in the X-Y mode of operation (Figure 4). The maximum safe ac or dc voltage coupled to

the CHI (CH2 or EXT TRIG INPUT, if applicable) input connector should not exceed 250 V (dc + peak ac).

7. CH2 (Y) INPUT-BNCconnector to apply an external signal to the CH2 vertical system, or Y-axis (vertical) in the X-Y operation mode (Figure 4).

8. EXT TRIG INPUT-BNC connector to apply an ex ternal trigger input signal (Figure 4).

9. Ac Line Cord-Connects the instrument to an ac

power source (Figure 3). The cord may be conveniently

stored by wrapping it around the feet on the rear cover

(Figure 4),

Figure 3. Right tide view of instrument cabinet. Figure 4. Left side view of instrument cabinet.

REV A SEP 1979

305 Operators

CALIBRATOR AND DISPLAY CONTROLS

(FIGURE 5)

VERTICAL CONTROLS (FIGURE 6)

10. SCOPE POWER-Pushbutton switch turns the oscil

loscope on (ini and off (out).

11. INTENSITY-Controls the brightness of the crt display. Turn the control clockwise to increase display brightness.

The intensity level should be set to the lowest visible

display to prolong life o f the crt.

12. ON (FLASHES WHEN LOWI-LED indicator that glows green when SCOPE POWER is on and power is applied to the oscilloscope

The LED flashes on and off when batteries require re charging and then goes out when the batteries are complete ly discharged.

13. .3V CAL OUT (Calibrator)-Pin connector output provides an internally generated 0.3 volt, 1 kHz square wave. Calibrated voltage is useful for checking vertical de flection factor and probe compensation.

14. POSITION (CHI or X and CH2 or Y)-Controls the vertical position of the crt display for each channel. In the X-Y mode of operation, the CHI (X) controls the position of the display horizontally and CH2 (YJ controls the posi tion of the display in the vertical direction.

15. VOLTS/DIV (CHI and CH2)-Selects vertical de flection factor of signals applied to the CHI and/or CH2

INPUT connectors. The CAL (Variable! control must be in

the CALibrated detent for the indicated deflection factor.

16. VOLTS/DIV CAL (Variable) (CHI and CH2)-Control

(concentric with the VOLTS/DIV switch) provides contin uously variable uncalibrated deflection factors between the calibrated settings of the VOLTS/DIV switch. Extends the maximum deflection factor to at least 25 volts per division.

17. 5 DIV CAL-Position on the VOLTS/DIV switch that internally connects a calibrated signal to the vertical preamplifier circuit. Useful for checking instrument vertical deflection gain.

18. PULL INVERT-Pull the Variable knob to the out

position to invert the CH2 signal display.

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REV A SEP 1979

305 Operators

Figure 6. Location of vertical deflection system controls.

selects method of coupling the input signal to the vertical deflection system.

AC: Input signal is capacitively coupled to the vertical attenuator circuit. Dc component o f the input signal is blocked. Lower frequency lim it (lower —3 dB point) is about 10 hertz.

GND: Connects the input attenuator to ground provid ing a zero (ground) reference voltage display (does not ground the input signal). Allows precharging of the vertical input coupling capacitor by applying the input signal via a one megohm resistor.

DC: All components of the input signal are directly

coupled to the vertical attenuators.

20. Display Mode-Five position lever switch that selects

the operation mode o f the vertical deflection system (signal

displayed on the crt).

CH I: Displays the signal applied to the CHI (X) INPUT

connector.

CH2: Selects the signal applied to the CH2 (Y) INPUT connector for display. The CH2 mode position is selected for X-Y operation (in conjunction with X-Y position of SEC/

DIV switch) and provides vertical deflection from the CH2 INPUT.

305 Operators

REV A SEP 1979

tween the signals applied to the CHI and CH2 INPUT con nectors. This switching between channels occurs at the com pletion of each sweep. This operating mode is useful when viewing both input signals at sweep rates of 1 millisecond/ division or faster.

CHOP iChopped): The dual-trace crt display alternates between the CH1 and CH2 Input signals at a fixed rate of about 50 kHz. This mode is useful when viewing input signals at sweep rates of 0.5 millisecond/'division or slower.

ADD: Crt display is the algebraic sum of the signals applied to the CHI (X) and CH2 (V> INPUT connectors (CHI plus CH2). When the PULL: INVERT control is pulled out. the CH2 input signal is inverted providing a difference display of signals applied to the CH 1 and CH2

INPUT connectors (CHI minus CH2).

HORIZONTAL SWEEP CONTROLS (FIGURE 7)

21. POSITION-Controls horizontal positioning of the

crt display, except in the X-Y mode of operation when the

CHI (X) POSITION control provides horizontal positioning.

22. SEC/DIV-Selects the calibrated sweep rate of the

sweep generator circuit The CAL (Variable) control must be in its CALibrated detent position for the indicated time

base sweep rate.

Figure 7. Location of horizontal deflaction system controls.

REV A SEP 1979

305 Operators 11

s t w u iv i a l ivanaDiej-^oniroi tconcentric wun

the SEC/DIV switch) provides continuously variable uncali brated sweep rates between the calibrated settings of the SEC/DIV switch. Extends the slowest sweep rate to at least

1.25 seconds per division.

24. PULL X10 MAG—Pull the CAL (Variable) control knob to the out position to magnify the sweep rate by a factor of 10. Extends the fastest sweep rate to 0.1 micro- second/division.

25. X-Y—Selects the X-Y display operating mode when SEC/DIV switch is rotated to the X-Y position. X-axis signal is provided by the CHI (X) INPUT connector, and Y-axis signal input is through the CH2 (Y) INPUT connector. Verti cal Display Mode switch must be in the CH2 position for

X-Y operation.

TRIGGERING CONTROLS (FIGURE 8)

26. Source-Push-button switches to select signal

source applied to the trigger generator circuit.

CHI (in): Signal connected to the CHI INPUT con

nector is used as the trigger signal. Figure 8. Location of trigger and sweep controls.

305 Operators

REV A SEP 1979

CH2 (in); The signal connected to the CH2 INPUT con

nector is the trigger signal.

EXT (External Trigger) (CHI and CH2 push buttons out): Signal connected to the EXT TRIG INPUT connector is the trigger signal.

27. Slope-Push button switch selects either the positive

going or negative going slope of the trigger signal.

+ (out): Sweep triggers on the positive-going portion of

the trigger signal.

- (ini: Sweep triggers on the negative-going portion of

the trigger signal.

28. Coupling -Push button switch selects method of

coupling the signal to the trigger generator circuit.

AC (out): Rejects dc and attenuates signals below about 60 Hz. Accepts signals from about 60 Hz to 5 MHz.

OC (in): Provides direct coupling for signals within the vertical bandpass (dc to about 5 MHz).

29. TRIGGER LEVEL—Selects the amplitude point on the triggering signal at which sweep is triggered. It is usually adjusted after Trigger Source, Coupling and Slope have been selected.

30. TT L -ln conjunction with TTL positions of the CH1/CH2 VOLTS/DIV switch, presets the trigger for a stable display from an input TTL source. Trigger Coupling must be in DC and Mode switch in the NORM position.

31. Trigger Mode-Push-button switch that determines the operating mode of the trigger circuit.

AUTO (Automatic) (in): Sweep is triggered when a signal with sufficient amplitude and a repetition rate of at least 200 Hz (to 5 MHz) is applied to the vertical system.

In the absence of an adequate signal, sweep free-runs to

produce a reference display trace.

NORM (Normal) (out): Sweep is initialized if the follow ing circuit conditions are met: TRIGGER LEVEL set cor rectly .sufficient signal amplitude applied to vertical system; input signal frequency within the vertical bandpass limits when Coupling is in the DC position, or signal frequency is between 60 Hz to 5 MHz in AC Coupling mode. In the ab sence of an adequate trigger signal or when trigger controls are misadjusted, there is no sweep or trace.

305 Operators

DIGITAL MULTIMETER CONTROLS

(FIGURE 9)

32. DMM POWER-Push-button switch turns the digital multimeter on (in) and o ff (out). The digital readout lights when power is applied to the multimeter.

33 FUNCTION—Self cancelling switches select the

voltage or resistance measurement functions of the digital

multimeter.

ACV (in): Measures ac voltages connected to the DMM

input jacks.

DCV (in): Measures dc voltages connected to the DMM

input jacks.

k fi (in): Measures resistance connected to the DMM

input jacks.

34. Digital Readout-Displays measurement selected by the FUNCTION control switch. Negative polarity indicator is automatic. No polarity indication for positive voltage measurements.

Decimal point locator is automatic. The readout displays

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

" when voltage of the applied power source

(either external, or internal batteries) is insufficient.

Internal Battery Voltage Indicator-When all the DMM

FUNCTION push buttons are in the out position and power

is being supplied from internal battery source, the digital readout indicates battery voltage (7.2 Vdc nominal)

F.gur* 9. Location of digital multimeter control*.

305 Operators

REV B OCT 1980

BASIC INSTRUMENT OPERATION

OPERATING CONSIDERATIONS

To ensure optimum measurement accuracy, the following information should be considered before operating the instrument.

Signal Connections

Generally, probes offer the most convenient means of

connecting an input signal to the instrument Oscilloscope probes are shielded to prevent pickup of electrostatic inter

ference. The supplied 10X probe offers a high input im

pedance, which minimizes circuit loading and allows the circuit under test to operate very close to normal conditions providing accurate measurements. Conversely, it also at tenuates the input signal amplitude by a factor of 10.

Coaxial Cables

Cables used to connect signals to the input connectors

have a considerable effect on the accuracy of a displayed

waveform. To maintain the original frequency character istics o f an applied signal, high quality, low loss coaxial

cable should be used. Also, the cable should be terminated

at both ends in its characteristic impedance. If this is not possible, use suitable impedance matching devices.

Grounding

The most reliable signal measurements are made when

the 305 and the unit under test are connected together by a common reference (ground) lead in addition to the signal lead or probe. The ground strap on the probe provides the best ground. Also, you can connect a ground lead to the chassis ground connector located on the right side panel of the instrument.

Graticule

The graticule is internally marked on the faceplate of

the crt to provide accurate measurements without parallax.

The graticule is marked with eight vertical and ten horizon

tal major divisions. In addition, each major division is divid

ed into five minor divisions. The vertical deflection and horizontal timing are calibrated to the graticule, so accurate measurements can be made directly from the crt.

REV A SEP 1979

305 Operators

Probe Compensation

To ensure that measurements are accurate, always com pensate the probe before using. To compensate the probe, touch the probe tip to the ,3V CAL OUT jack on the 305 front panel and display several cycles of calibrator square wave at approximately A divisions in amplitude. Adjust probe compensation through hole in the compensation box for the best front-corner response to the signal as shown in

Figure 10.

RRECT

(Ft

.AT)

ER COM BATED rERSHOOT)

DER COM.

jCATcn

O V PEt

(0 \

IRC

»oA 1 CU

>LLOFF)

-812424-2SA(223'

Figure 10. Probe compensation.

305 Operators

REV A MAR 1980

H U J U d l lV I C n i AINU D M 5IU U l O rL M T O

To verify the operation and accuracy of the 305, con firm the following checks and adjustments.

OSCILLOSCOPE DISPLAY

Before operating the 305 oscilloscope, preset the con-

trols as listed below:

Display Mode CHI VOLTS/DIV

10m

VOLTS/DIV CAL

(Variable) Detent

POSITION (Vertical)

Midrange AC/DC (Coupling) DC INVERT

Off (in)

SEC/DIV

.5m

SEC/DIV CAL

(Variable)

Detent

PULL: X I0 MAG

Off (in)

POSITION (Horizontal)

Midrange

Source

CHI (in) AC/DC (Trigger coupling) DC AUTO/NORM (Mode) AUTOmatic (in) Slope

+ (out)

TRIGGER LEVEL

Midrange SCOPE POWER

On (in)

Intensity

Demonstrate normal intensity operation as follows:

1. Rotate the INTENSITY control between its max imum clockwise and counterclockwise positions. The dis play should vary from full intensity to no display.

2. Reset the INTENSITY control to a comfortable

viewing level.

CAUTION <

To protect the crt phosphor, do not leave the INTENSITY control set any higher than necessary to provide a satisfactory display.

Focus and Astigmatism

Figure 11 shows the location of external operator

adjustments.

1. Adjust FOCUS for optimum crt trace definition.

2. In conjunction with FOCUS adjustment, obtain optimum definition of the crt trace with the ASTIGmatism adjustment.

REV A SEP 1979

305 Operators

1. Position trace to the center horizontal graticule line.

2. Adjust TRACE ROTATION so the trace is parallel to

the center horizontal graticule line.

Channel 1 and Channel 2 Step Attenuator Balance

(Figure 11)

1. Obtain a free-running trace.

2. While switching the CHI (CH2, if applicable)

VOLTS/DIV switch between the 20m and 5m position, ad just the CHI STEP ATTEN B A l for minimum trace shift between these positions.

Vertical System

Demonstrate the operation of the vertical deflection

system controls as follows:

1. Connect 10X probe from CHI INPUT connector to

the .3V CAL OUT jack.

2. Set Trigger Mode to NORMal and TRIGGER LEVEL

for a stable square wave display.

VOLTS/DIV to 10m.

4. Adjust the horizontal POSITION control so the dis

play begins at the left vertical graticule line.

5. Rotate CHI POSITION control fully counterclock wise and fully clockwise settings. The display should move off screen in both vertical directions. Adjust for a normal centered display.

6. Adjust the CHI POSITION for an equal deflection above and below the center horizontal graticule line. The display should total approximately three vertical divisions

in amplitude and full cycle pulse width approximately two divisions wide. This corresponds to .3 volts, 1 kilo

hertz calibrated square wave output (refer to Application

and Measurements Section of this manual for peak-to-peak amplitude, time duration and frequency measurement

formulas).

7. Set CHI Vertical Coupling to GND and note position of the baseline trace. Set Coupling to AC. The display should be equally deflected above and below the reference base line trace position. Reset Coupling to DC.

305 Operators

REV A SEP 1979

USE AN INSULATED SCREWDRIVER WHEN MAKING THESE ADJUSTMENTS.

CHI STEP ATTN BAL CH2 STEP ATTN BAL

RECESSED SCREWDRIVER ADJUSTMENTS TO ELIMINATE CRT TRACE SHIFT WHEN SWITCHING BETWEEN ADJACENT POSITIONS OF THE VOLT/ DIV CONTROL SWITCH.

ASTIG (ASTIGMATISM)

RECESSED SCREWDRIVER ADJUSTMENT USED IN CONJUNCTION WITH THE FOCUS ADJUSTMENT TO OBTAIN OPTIMUM DEFINITION OF THE CRT.

<D>

FOCUS

RECESSED SCREWDRIVER ADJUSTMENT FOR OPTIMUM CRT TRACE DEFINITION.

TRACE ROTATION

RECESSED SCREWDRIVER ADJUSTMENT TO

HORIZONTALLY ALIGN THE CRT DISPLAY TRACE.

2424-06

Fioura 11. Location of external operator adjustments.

305 Operators

8. Rotate the CHI VOLTS/DIV CAL (Variable) control to its fully counterclockwise position. The display should docroase in vertical amplitude to at least 1.2 divisions or less. Return CAL (Variable) control to the detent position.

9. To demonstrate operation of the CH2 vertical system, set Vertical Display Mode to CH2, connect probe to the CH2 INPUT connector, and perform steps 1 through

8. Check the INVERT function by pulling the PULL IN VERT knob. The display should be inverted. Return the INVERT function to its off position.

10. Return the probe to CHI INPUT connector and Vertical Display to CHI.

Horizontal and Triggering System

Demonstrate the operation of the horizontal and trigger

ing system controls as follows.

1. Adjust the horizontal POSITION control so the dis

play starts at the left vertical graticule line. Observe that the display begins with a positive pulse.

2. Push the Slope switch to the in position. Observe the

display now starts with a negative pulse. Push in and release

the Slope switch. The display should again be in the positive

position.

3. Rotate the SEC/DIV switch ono or two positions on

either side of the .5 ms position. The display sweep rate

should change accordingly. Reset the SEC/DIV to the .5 ms

position.

4. Rotate the SEC/DIV CAL (Variable) control to its fully counterclockwise position. The pulse width should decrease to at least 0.8 divisions or less. Return CAL (Vari able) to its detent position.

5. Set the SEC/DIV to 1m and pull the X10 MAG knob. The magnified square wave display pulse width should ex pand from 1 division to 10 divisions. Return the X 10 MAG knob to the off position.

DIGITAL MULTIMETER DISPLAY

; CAUTIO N s

The maximum input voltage is * 1000 V (dc *

peak acj between the HI and LO input or be

tween the HI input and chassis The maximum LO floating voltage is t500 V (dc -t peak ac) between L 0 and chassis. The DMM may be damaged by attempting to measure voltage if the meter is in the k£l FUNCTION mode of operation and the applied voltage is in excess of ±100 V (dc + peak ac).

305 Operators

REV A SEP 1979

DC Voltage

1. Set DMM POWER switch on (in).

2. Push in the DCV FUNCTION push button. The read out should display -.0 00 i2 counts with no signal connect ed to DMM INPUT

3. Connect the LO test probe to the reference test point

(usually ground or a test point) and the HI test probe to the

unknown positive dc voltage to be measured.

4. The display represents the value of the dc voltage

source.

5. Reverse the HI and LO test probes and observe the numeric reading remains the same but the negative polarity sign is indicated.

6. Disconnect DMM from the dc source.

AC Voltage

1. Set DMM POWER switch on.

2. Push in the ACV FUNCTION push button. The read out should display .000 110 counts with no signal connect to the DMM INPUT and the two test probes touching each other.

3. Connect the LO test probe to the reference test point (usually circuit ground or to a test point) and the HI test probe to the unknown ac voltage to be measured.

4. The display represents the value of the ac voltage

source.

5. Disconnect DMM from the ac voltage source.

Resistance

1. Push the kQ FUNCTION push button. The readout should display a flashing -1999. overrange condition with no signal input connected to the DMM INPUT.

2. Touch the two DMM test probes together. The dis play should read .000 ±3 counts indicating proper operation of the kD FUNCTION.

3. Connect the DMM test probes across the unknown resistance to be measured.

4. The display represents the value of the unknown resistance.

5. Set DMM POWER switch o ff (out).

REV A SEP 1979

305 Operators 21

APPLICATION AND MEASUHEMENIS

Once the operator becomes familiar with the instrument and makes the initial operator's adjustments, this section will aid in making measurements. Basically, this instrument is used the same as if it were an individual multimeter and individual general purpose oscilloscope with the added con venience o f having both functions in one cabinet.

The procedures for making the basic voltage and resistance measurements with the digital multimeter are the same as those in the Adjustments and Basic Displays section and will not be duplicated here.

instantaneous Amplitude Measurement-DC (Figure 12)

Measure the amplitude of any point on a waveform with

respect to ground as follows:

1. Set Vertical Coupling to DC.

2. Apply the signal to be measured to either vertical in put connector. Set Vertical Mode to the channel being used.

3. Obtain a stable display.

4. Set SEC/DIV switch to display several cycles of

signal.

305 Oporators

W O 1 ( Q II K i U I w u u p i l l l j l I U W I « U , • O J I H W I I M «v * 5 I V »

reference line.

6. Set Vertical Coupling to DC. If waveform appears above reference line, voltage is positive. If waveform appears below reference line, voltage is negative.

7. Measure vertical difference (in divisions) between re ference line and desired point on waveform and multiply by

the VOLTS/DIV setting (CAL-Variable-must be in detent setting).

FORMULA: VERTICAL DEFLECTION

FROM REFERENCE x VOLTS/DIV _ INSTANTANEOUS LINE TO MEASURED POINT

SETTING AMPLITUDE

EXAMPLE:

DIVISIONS

MILLIVOLTS/

DIVISION

- 50 MILLIVOLTS

(2237-20) 2424-14

Figure 12. Example of instantaneous voltage measurement with VOLTS/DIV sat at 10M position.

REV A SEP 1979

305 Operators

reaK-io-reaK amplitude measurement—mu (Figure 13)

Use the following procedures for peak-to-peak

amplitude measurements:

1. Apply the signal to be measured to either vertical input connector. Set the Vertical Mode to the channel to be used.

2. Set SEC/DIV to display several cycles of wave form. Adjust triggering controls for a stable display.

3. Set VOLTS/DIV switch to display about three verti

cal divisions of waveform. Confirm that the CAL (Variable)

control is in the detent position.

FORMU LA:

4. Adjust vertical POSITION so that the lower portion of the waveform coincides with a horizontal graticule line and that display remains within the viewing area.

VERTICAL x DEFLECTION

(IN DIVISIONS)

VOLTS/DIV _

SETTING

AMPLITUDE

5. Horizontally position the display so that one of the

peaks coincides with the center vertical graticule line.

EXAMPLE:

3 X .5 » 1.5 VOLTS

DIVISIONS VOLTS/ PEAK TO PEAK

SETTING DIVISION

6. Measure the peak-to-peak amplitude of the signal by multiplying vertical deflection (in divisions) by the VOLTS/ DIV settings.

(2237-19) 2424-15

Figure 13. Example o f peak-to-peak voltage measurement.

305 Operators

REV A SEP 1979

Voltage Comparison Measurements

For application where signal voltage is compared to some signal reference amplitude, it may be desirable to use a different deflection factor than available with settings of the VOLTS/DIV switch. To establish an arbitrary vertical

deflection factor, proceed as follows:

1 Connect a known amplitude reference signal to either vertical input connector. Set Vertical Mode to the channel being used.

2. Adjust VOLTS/DIV and CAL(Variable) control for desired vertical deflection. DO NOT change this setting after the reference has been established.

Substituting example values:

Reference signal amplitude is 30 volts with a VOLTS/ DIV switch set to 5 and the VOLTS/DIV Variable ad justed to provide a vertical deflection of 4 divisions:

. „ 30 volts

1.5

------------- 4 x 5

4. To measure an unknown signal, set the VOLTS/DIV switch to provide sufficient vertical deflection for an accurate measurement. DO NOT change or adjust the VOLTS/DIV Variable knob. Determine the vertical de flection (in divisions) and calculate the amplitude o f the unknown signal using the following formula:

Signal - VOLTS/DIV X Vertical X Vertical amplitude Setting Conversion deflection

Factor (in divisions)

3. Determine vertical converison factor using this

formula:

Vertical Reference signal amplitude (in volts) Conversion = Vertical deflection (in divisions) x Factor VOLTS/DIV setting

Substituting example values:

VOLTS/DIV switch set at 1 and vertical deflection of

the unknown signal is 5 divisions. Conversion factor is

1.5. 1 x 1.5 x 5 ■ 7.5 volts.

REV A SEP 1979

305 Operators 25

Time Duration and Frequency Measurement

(Figure 14)

Set the SEC/DIV control to display one complete wave form. Check that the CAL (Variable) control is in the detent position. Measure the horizontal distance between the two time measurement points (in divisions) and m ultiply this distance by the setting of the SEC/DIV control.

The frequency of this signal can be calculated by taking

the reciprocal of the measured time duration o f one event. For example, the time duration of the waveform is

16.6 milliseconds. Using the formula:

Frequency * —

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

;—

Time duration

Substituting the values:

60 Hertz

16.6 milliseconds

FORMULA: HORIZONTAL y SEC/DIV

DISTANCE A SETTING

- TIM E OU R ATION

EXAMPLE:

DIVISIONS X MILLISECONDS/ “ ’ 6.6 MILLISECONDS

DIVISION

<2237- 23) 2424 16

Figure 14. Example o f time duratio n and frequency measurement.

305 Operators

REV A SEP 1979

Figure IB. Time difference between two pulses from different sources.

Time Difference Measurement Between Two Pulse Waveforms From Different Sources

(Figure 15)

1. Obtain a normal sweep display.

2. Confirm SEC/DIV CAL (Variable) control is in the

CALibrated detent position.

3. Set Trigger Source to C HI.

4. Connect known reference signal to the CHI INPUT connector and the comparison signal to CH2 INPUT connector.

5. Set Vertical Mode to either CHOP or ALT mode and center each of the displays vertically.

6. Measure the horizontal difference between the two signals.

7. M ultiply this distance by the SEC/DIV switch setting

If X10 MAG control is used, divide the difference by 10.

REV A SEP 1979

305 Operators

Dual Trace Phase Difference Measurements (Figure 16)

Phase comparison between any two signals of the same frequency can be determined using the dual trace feature of the instrument To make these comparisons, use the following procedures:

1. Set both the CHI and CH2 Vertical Coupling to

AC.

2. Set Vertical Mode to CHOP or ALT (CHOP is more suitable for low frequency signals; ALT for the higher fre quency signals). Position both display traces to the center horizontal graticule line.

3. Set Trigger Source to CHI, and Trigger Mode to AUTO.

4. Adjust the TRIGGER LEVEL for a stable display.

5. Connect the reference signal to CHI INPUT connect or, and comparison signal to CH2 INPUT connector.

CHANNEL 1 CHANNEL 2

MEASURE

TIME FROM

A TO B

HORIZONTAL

DIFFERENCE

FORMULA:

HORIZONTAL y DEGREES/

DIFFERENCE * DIVISION (A TO Bl

PHASE DIFFERENCE

EXAMPLE

0.6 x 46V . o

DIVISION OIVISION "

(2237-21) 2424-18

Figure IS. Example of dual tract phata diffarenca measurement.

305 Operators

6. If input signals are of opposite polarity, pull the CH2 10. Measure the horizontal difference (in divisions) be

INVERT knob to invert the CH2 display (signals may be of tween corresponding points on the two waveforms,

opposite polarity due to 180° phase difference; if so. take this into account in the final calculation).

11. Multiply the difference (in divisions) by 45° /division

to obtain the exact amount of phase difference.

7. Adjust CHI and CH2 VOLTS/DIV and associated CAL (Variable) controls for displays that are equal and about five divisions in amplitude.

8. Set the SEC/DIV switch for a sweep rate which dis

plays about one cycle of reference waveform.

9. Adjust the SEC/DIV CAL (Variable) control for a

one cycle reference signal (C HI) of exactly 8 divisions be

tween the 2nd and 10th graticule lines.

NOTE

Each division of graticule represents 45° of cycle

<360° 4- 8 divisions * /division). Therefore, the sweep rate may he stared in terms of degrees as 45° /division.

REV A SEP 1979

305 Operators

High Resolution Phase Uitterence Measurement (Figure 17)

For phase differences less than 45" measurement accuracy may bo improved by using the PULL: X10 MAG control as follows:

1. Perform steps 1 through 8 of the Dual Trace measure

ment procedures.

2. Center measurement points on the vertical graticule

line.

3. Pull the X 10 MAG knob. The sweep rate is now

4.5°/division (45°/division t 10).

4. Adjust the horizontal POSITION control to move

measurement points within the graticule area.

5. Measure horizontal difference (in divisions) between

corresponding points of the two waveforms.

6. Multiply horizontal difference by the magnified

sweep rate (4.5°/division>.

measurement

305 Operators

Rise time measurements are made in the same manner as time duration measurements, except the horizontal meas urements are made between the 10% and 90% points of the waveform amplitude. Rise time measurements are made as follows:

1. Set the VOLTS/DIV and Variable control for a 5divi-

sion display.

2. Adjust vertical POSITION so that display bottom

crosses midpoint of the second division.

3. Measure horizontal distance (in divisions) between

the 10% and 90% points on the waveform (points A and B).

4. To find the rise time, multiple the horizontal distance

(in divisionsl by the SEC/DIV setting.

Figure 18. Example of rise time measurement.

REV A SEP 1979 305 Operators

3 1

......

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

rnvuu MVjwviiwii

Some signals may contain undesirable frequency com

ponents, as shown in Figure 19. Common mode rejection

can eliminate or reduce these components from the meas urement. Use the following procedure to reduce or elimi nate an undesirable line frequency component:

1. Apply signal to CHI INPUT connector.

2. Apply line frequency signal to CH2 INPUT connector.

3. Set the Vertical Mode to ALTernate position.

4. Pull the PULL: INVERT knob to invert the channel

2 display.

5. Adjust the CH2 CAL (Variable) control so that the amplitude of the channel 2 signal compares or is equal to the undesired signal component of channel 1 display.

6. Set the Vertical Mode to ADD and readjust CH2 Variable control for maximum rejection ol the undesired signal component.

CH 1 tklUNAL

WITH

UNWANTED

LINE

FREQUENCY

COMPONENT

CH 2 SIGNAL

FROM LINE

FREQUENCY

SOURCE

(INVERTED!

A. CH 1 AND CH 2 SIGNALS

SIGNAL WITH

LINE FREQUENCY COMPONENT

CANCELED

OUT

(2237-17)

2424-21 B. RESULTANT SIGNAL.

Figure 19. Common mod* r*|*ction of an undesired line-frequency.

305 Operators

REV A SEP 1979

SPECIFICATION

NOTE

Refer to the service manual for complete specifications. Specification given for an operating

range of +20°C to +30°C unless otherwise stated

TABLE 2

Electrical Characteristics

Characteristic

Performance Requirement

Supplemental Information

CALIBRATOR

Output Voltage

+20°C to +30°C

0.3 V within 1%.

-1 5°C to +55°C

0.3 V within 2%.

Repetition Rate

Approximately 1 kHz.

VERTICAL

Deflection Factor

Range

5 mV/div to 10 V/div.

11 steps in 1-2-5 sequence.

REV A SEP 1979

305 Operators

TABLE 2 (com)

Characteristic

Performance Requirement

Supplemental Information

Deflection Factor (cont)

Accuracy

0°C to +40°C

Within 3%.

-15°C to 0°C

Within 4%.

+40°C to +55°C Within 4%.

Uncalibrated (Variable) Continuously variable between

calibrated settings.

Extends deflection factor to at least 25 volts/div.

Frequency Response

Upper Bandwidth Limit

5 mV/div to 10 V/div

Dc to at least 5 MHz ( -3 dB point)

4-division reference signal verti cally centered. VOLTS/DIV CAL

(Variable) in detent.

Add Mode

Dc to at least 4.5 MHz (- 3 dB point).

VOLTS/DIV CAL (Variable) in

detent.

Lower Bandwidth Lim it

Ac Coupled (capacitive)

Approximately 10 Hz all deflection

factors.

305 Operators

REV A SEP 1979

TABLE 2 (contl

Characteristic Performance Requirement Supplemental Information

VERTICAL

Input R and C

Input Resistance

1 M fi within 2%.

Input Capacitance

Approximately 47 pF.

Maximum Input Voltage

Dc Coupled

250 V (dc + peak ac).

Ac Coupled

250 V (dc + peak ac) or 250 V p-p ac at 1 kHz or less.

Chopped Mode Repetition Rate

Approximately 50 kHz.

TRIGGERING

Trigger Sensitivity

Dc Coupled

0.3 division internal or 15 mV external from dc to 0.5 MHz, increasing to 0.75 divisions internal or 50 mV external from

0.5 MHz to 5 MHz.

305 Operators

TABLE 2 (cont)

Characteristic Performance Requirement

Supplemental Information

Trigger Sensitivity Icont)

Ac Coupled

0.3 division internal or 15 mV external from 60 Hz to 0.5 MHz, increasing to 0.75 division internal or 50 mV external from

0.5 MHz to 5 MHz. Attenuates all signals below about 60 Hz.

Maximum Input Voltage

250 V (dc + peak ac) at 1 kHz or less.

Display Time Jitter Due to Triggering

20 ns or less.

External Input

Resistance

Approximately 1 Mf2.

Capacitance

Approximately 47 pF.

305 Operators

REV A SEP 1979

Characteristic Performance Requirement

Supplemental Information

TTL Trigger (Trigger Mode: Normal and Dc Coupling. V/Div: 50 m, 0.1 or 0.2)

Threshold Voltage

Int (with 10X probe) 1.4 V within ±0.3 V.

Ext (with 10X probe)

1.4 V within ±0.2 V.

Minimum Input Swing

Int 0.5 div.

Ext 500 mV p p.

AUTO Operation Sensitivity (Ac or Dc Coupling)

500 Hz to 0.5 MHz

Internal External

0.5 div 35 mV

0.5 MHz to 5 MHz

1.0 div

70 mV

Low Frequency Response (Down to 200 Hz or less)

2.0 div 140 mV

REV A SEP 1979

305 Operators

Characteristic

Supplemental Information

Performance Requirement

HORIZONTAL

Sweep Range

Range

.5 s/div to 1 \i)div.

18 steps in 1-2-5 sequence. X10 MAG

extends fastest sweep rate to . 1 ps/div.

Accuracy

SEC/DIV Variable in Cal detent posi tion. Timing sot at 1 ms/div or 1 /is/div. Disregard first 0.5 /js of sweep.

0°C to +40°C Within 3%.

Over center 8 division display.

-15°C to 0°C Within 4%.

+40°C to +55°C Within 4%.

Linearity Over any 2 division portion within

center 8 divisions. Disregard first

1 /is of total sweep.

O’ C to +40°C

Within 4%.

-1 5°C to 0°C Within 5%.

+40°C to +55°C

Within 5%.

305 Operators

REV A SEP 1979

a c »v«iiu

Characteristic

Performance Requirement

Supplemental Information

SEC/DIV CAL (Variable) Range

Continuously variable between

Extends slowest sweep range to at

calibrated settings.

least 1.25 second/division (2.5:1)

Horizontal Magnifier X10: Calibrated Magnifier

Accuracy

Over center 8 division display. Exclude the first 10 divisions and all the divi sions past 90th division.

0°C to +40°C

Within 5%.

—15°C to 0°C

Within 6%.

+40°C to +55°C

Within 6%.

Linearity

Over any 2 division portion within center 8 divisions. Exclude the first 10 divisions and all the divisions past 90th division.

0°C to +40°C

Within 6%.

—15°C to 0°C Within 7%.

+40°C to +55° C

Within 7%.

REV A SEP 1979

305 Operators

Characteristic

Performance Requirement

Supplemental Information

X-Y Mode X-Y position of SEC/DIV switch and

X-Y (CH2) position of display mode

switch must be selected.

X Sensitivity

Same as vertical.

Over the center 8-divisions of display.

Accuracy (0UC to +40°C|

Within 4%.

Variable Range Same as vertical.

X-Axis Bandwidth Dc to 150 kHz.

8-division reference signal.

Input R and C

Resistance Same as vertical.

Capacitance Same as vertical.

Maximum Input Voltage Same as vertical.

DIGITAL MULTIMETER

DC Voltmeter

Range 2 V. 20 V. 200 V, 1000 V.

Accuracy <+15°C to +35°C) Within 0.1% of reading, ±2 counts.

305 Operators

REV A SEP 1979

TABLE 2 (cont)

Characteristic

Performance Requirement

Supplemental Information

DC Voltmeter (corn)

Common Mode Rejection

At least 100 dB at dc, 80 dB at 60 Hz with 1 kI2 unbalance.

Normal Mode Rejection

At least 30 dB at 60 Hz increasing 20 dB per decade to 2 kHz, when maximum input signal voltage is within range X2.

Step Response Time

No more than 1 second plus the range

step time (no more than 1 second / step).

Input Resistance

10 w ithin 2%.

AC Voltmeter

Range

2 V, 20 V, 200 V. 700 V.

Accuracy (+15°C to + 35 *0

Within 0.5% of reading. ±10 counts

40 Hz to 500 Hz.

Response Time

No more than 5 seconds plus the range step time (no more than 1 second/step).

Input Impedance

10 MQ within 3% paralleled by at least 70 pF.

REV B MAR 1980

305 Oparators

TABLE 2 (coin)

Characteristic

Performance Requirement

Supplemental Information

Ohmmeter

Range

2 kH, 20 kft, 200 k fi. 2000 kU.

Accuracy (+15°C to +35°CI Within 0.6% of reading, ±3 counts.

Measurement Current 2 V -r range setting.

Response Time

No more than 5 seconds plus the range step time (no more than 1 second/step).

Battery Check Function (Internal batteries only)

Accuracy

Within 5% of reading at 5.5 V to 8 V battery voltage.

Range

Fixed 20 V range.

Maximum Safe Input Voltage

at DMM INPUT Connector

DCV FUNCTION Setting

±1000 V (dc + peak ac) between HI and LO inputs or between HI and chassis.

305 Operators

REV A SEP 1979

TABLE 2 Icont)

Characteristic Performance Requirement

Supplemental Information

Maximum Safe Input Voltage at DMM INPUT Connector (cont)

ACV FUNCTION Setting 700 V rms if sinusoidal.

±1000 V (dc + peak ac) between HI and LO inputs or between HI and chassis.

±500 V |dc component) between HI and LO inputs.

k-Q FUNCTION Setting

±100 V (dc + peak ac) between HI and LO inputs.

LO Floating Voltage +500 V (dc + peak ac) between LO

and chassis.

INTERNAL BATTERY SUPPLY

Operating Time

Oscilloscope only operating

Calibrator waveform displayed

5.4H.

305 Operators

TABLE 2 (cont)

Characteristic

Performance Requirement

Supplemental Information

Operating Time (cont)

INTENSITY, maximum

8 div, 5 MHz signal displayed

2.0H.

DMM only operating

10.0H.

Oscilloscope and DMM

Calibrator waveform displayed

3.2H.

INTENSTIY, maximum

8 div, 5 MHz signal displayed

1.6H.

ENVIRONMENTAL

Temperature

Operating

-15°C to +553C (Oscilloscope)

0°C to +55°C (DMM)

Altitude

Operating To 30,000 feet.

305 Operators

Tektronix 305 DMM Instruction Manual

Specifications and Main Features

Frequently Asked Questions

User Manual