Tektronix DM 502 Instruction Manual

Tektronix, Inc.

P.0. Box 500

Beaverton, Oregon 97005

TEKTRONIX®

DM

502

DIGITAL

MULTIMETER

INSTRUCTION

MANUAL

Serial Number

070 1726

00

Flr»l Printing

Aug 1974

WARRANTY

All TEKTRONIX instruments are warranted against

defective materials and workmanship for one year.

Any questions with respect

to

the warranty should

be taken up with yourTEKTRONIX Field Engineer or

representative.

All requests for repairs and replacement parts

should

be

directed to the TEKTRONIX Field Office

or representative in your area. This will assure

you

the fastest possible

service.

Please include

the

instrument Type Number or Part Number and Serial

Number with all requests for parts or service.

Specifications and price change privileges reserved.

Copyright

c

1974 by Tektronix. Inc., Beaverton,

Oregon. Printed in the United States of America. All

rights

reserved.

Contents of this publication may not

be

reproduced in any form without permission of

Tektronix. Inc.

U.S.A. and foreign TEKTRONIX products covered

by

U.S.

and foreign patents and/or patents pending.

TEKTRONIX is a registered

trademark

of Tektronix,

Inc.

DM 502

SECTION

1

SECTION

2

SECTION

3

SECTION

4

SECTION 5

CHANGE INFORMATION

TABLE

OF

CONTENTS

Page

OPERATING INSTRUCTIONS

Introduction 1-1

Instrument Description 1-1

Installation and

Removal

1-1

Operating Considerations 1-2

Input

Connections

1-2

Functions Available

at

Rear

Connector

1-2

Sine Wave Response 1-3

Temperature Measurements 1-3

Making

Measurements

1-4

DC Voltage

Measurements

1-4

DC Current

Measurements

1-4

AC Voltage,

Current and Resistance Measurements

1-5

Decibel Measurements

1-5

Temperature Measurements

1-5

Using

a

Transistor as a

Temperature-Sensing Device

1-5

Accurate Current

Source

1-6

Specifications

1-6

THEORY OF

OPERATION

Introduction

2-1

Attenuator and Input Switching

2-1

AC Converter

2-1

DB

Converter

2-1

Ohms

Converter

2-2

Temperature Measurement Circuitry

2-2

Clock

2-3

Analog-To-Digital

Converter

2-3

Display

2-5

Power Supplies

2-5

ELECTRICAL REPLACEABLE

PARTS LIST

SERVICE INFORMATION

Internal

Adjustment Procedure

Rear Interface

Connector Assignments

Rear

Interface Connector Wire

Locations

Front Panel Controls

and Connectors

Block Diagram

Parts Location Grid

Attenuators

and Conversion Circuits

Schematic

Integrator. A/D Converter and Display

Schematic

Power Supply and Switch

Logic Schematic

MECHANICAL

REPLACEABLE PARTS LIST

Accessories

Repackaging

Exploded View

REV.

A. OCT. 1974

i

Section 1—DM 502

OPERATING

INSTRUCTIONS

INTRODUCTION

Instrument Description

The DM

502

Digital Multimeter measures dc and ac

voltage and current,

dBm, dBV, resistance and

temperature. The

ac

functions are average responding

and

rms

calibrated for sine waves. A single front panel

control selects all ranges. A

front-panel pushbutton

selects dB

readout

of ac

functions in lieu of voltage or

current. Rear interface-connector input is also

pushbut-

ton selected

from the front

panel. Values

of

dB

are

obtained by

adding the

selected dB range

value to the

display reading.

Readout in dBm or dBV

is chosen by

an

internal jumper. The unit is shipped

with the

jumper in the

dBm position.

An internal jumper

also permits selection

of fet input

(>

1000

MO)

or

10 MO input impedance on the two

lowest dc-

voltage ranges.

The unit is shipped with

the jumper in the

10 MO position. See

Fig.

1-2.

Temperature measurements are

made using

a

Tektronix P6430 probe

(Tektronix Part Number010-6430-

00)

or other suitable sensing devices. Option 2 in-

struments delete the

temperature measuring capability.

The readout is

a

3-1/2

digit display

using seven-

segment LED's. The decimal point is automatically

positioned

by

the

range-function switch.

Polarity

indica-

tion is automatic. A usable 50% overrange exists in all

measurement modes except ac voltage and

current,

1000

V dc,

and

the 2 A dc current range. In overrange, the

display blinks and the mostsignificant digit is suppressed.

Upon exceeding

the available 50% overrange, a 1 appears

in the most significant digit position. Display readings are

invalid

beyond

this point.

Interlaced bed output

(1,3, 2,

4)

referenced

to the low

input, is available at the rear interface

connector if user

wired.

NOTE

The DM 502 is not directly compatible with the 153

Calculator Interlace.

The

maximum input voltage

is

1 kV, 350 V at the rear

connectors. Thefront-panel HI and LOconnectors may be

floated

1 kV maximum above ground, the rearinputs 350V.

Installation and Removal

The DM 502 is calibrated and

ready

for

use

when

received. It operates in any compartment of

a

TM 500

series power module. See the power module instruction

manual for line voltage requirements and power module

operation. Fig. 1-1 shows

the DM 502 installation and

removal procedure.

Turn the Power Module

oil before inserting the DM

502. Otherwise, arcing may occur

at the rear inter-

lace

connectors, reducing their

useful life and

damage may be done to

the plug-in circuitry.

Check that the DM 502 is

fully

inserted in the

Power

Module. Pull the PWR switch on the Power Module. One or

more characters in the LEDdisplay

should

now be visible.

The Controls, Connectors and Adjustments foldout

page in Section

3

gives a complete description of the front

panel.

REV.

A, OCT. 1974

1-1

Operating

Instructions—

DM 502

Fig.

1-1. DM

502 Installation and removal.

OPERATING

CONSIDERATIONS

Input Connections

Three

binding

posts provide

measurement connec-

tions. The HI and

LO posts are normally used for

all

measurements

except temperature. Normal

measurement

conditions

will be with the

LO terminal ungrounded. A

connection between the

LO and GND posts maybemade

to

reference

the input against DM

502 chassis ground. Use

caution,

as

the

LO terminal is then connected

to earth

ground

through the three-wire power

cord.

False

readings

may be obtained

due to ground loops.

If the INPUT

button is

pushed

in, signal inputs are

made

via the rear interface

connector; if

the button is out, signal

inputs are made via

the

front

panel.

Functions Available at Rear Connector

HI. LO, GROUND, temperature

output at 10 mV per

degree and bed connections are available

at the

rear

interface connector.

The Rear Interface

Connector

Assignments

page in the Service

Section at the rear of this

manual gives data on

the various connections. Only

the

Temp

Out. Temp Gnd and HI and

LO inputs are factory-

wired. Jumper holes are

provided for making the desired

bed output connections.

See the wire locations illustration

in the foldout

pages for the correct circuit board locations.

Simply

insert and solder an insulated

wire strap in the

proper locations. Buffers

are required before the

data

outputs are used to drive external

loads. See Fig.

1-3

for a

typical buffer circuit.

The

DM 502 has a slot between

pins 1 7 and 18. A barrier

in the corresponding

position of the power module

jack

allows

only compatible

plug-ins to be used in that

compartment.

This protects the plug-in,

should specializ-

ed connections

be madeto that compartment.

Consult the

Building

A System section

of

the

power module manual

for

further information.

1-2

Operating Instructions—DM 502

FET Input

jumper

position

x i

e

<

x i

X

<

x

t

s

I

B X
*

X X
* »

• >

• •

* *
« •

°

a

< o

9

Fig.

1-2.

Locations ol dB reference jumper, input impedance jumper,

and

hard wired

C

or F

component or wire

changes.

Sine-wave Response

The DM 502 responds to the average value of a

sinusoidal

current or

voltage The

readout

indicates

the

equivalent rms value The effective

or

rms value of

a

sine

wave is 0.707 times the peak voltage or current. The

average value is 0.636 of the peak value The scale factor of

the DM 502 is 0.636/0 707 or 0.9. Multiply the DM 502

readout by 0.9

to

obtain the average value of

a

sinusoidal

input voltage

or current.

Temperature Measurements

Connect the P6430 (or other sensing device) to the

connector marked TEMP PROBE.

Use

care to align the

connector pins properly. Select calibration in “F

or °C

with the range-function switch. For best accuracy,

calibrate

the individual

instrument

to the probe used. See

the Internal Adjustment Procedure in the service section

of

this manual for the

proper procedure

13

Operating Instructions—DM 502

The Temp

Out

terminals

at the rear

interface

connector

are always connected to the output of the temperature

circuitry. This feature provides continuous temperature

monitoring capabilities in

°C

even while using other

functions of the DM 502. To avoid

a

momentary

scale

chahge when a recorder or other device is connected to

these

terminals avoid

switching through

the °F

position.

The

DM 502 may be

hard wired in either the °C

or

°F

range

independent of the range-function

switch

setting.

T

o

hard wire in the

°

F range, connect

a

jumper

as

shown in

Fig. 1

-2.

To

hard wire

in

°

C

lift either end of R285 as shown

in Fig.

1-2.

MAKING

MEASUREMENTS

With the DM 502

properly installed in

the power

module, allow twenty

minutes warmup time

for operation

to

specified accuracy. When the value

of the quantity

being

measured is unknown, select

the highest range

first.

To

prevent possible damage to switch

contacts by

Decrease the range

setting until the

display blinks

in-

high currents, do not switch

into, out of, or through

dicating

over-range. Then increase

the range switch to the the

current measurement

modes from the other

next higher position.

This method

obtains maximum measurement

modes with

a

high current source, or

resolution. Resolution of the DM 502

is 0.05% of full scale

large inductive or capacitive

load, connected to the

setting, except

temperature, which is

0.1°

. Do

not exceed DM 502

input. This caution does not

apply to

the

maximum voltage

ratings. With the range-function

switching

between individual current ranges up

to

switch in the 1

K

DC

VOLTS or 500 AC

VOLTS position,

the maximum stated

input current, as the

switch

internal damage may result

before overrange is indicated.

contacts are adequately protected

for this operation.

Fig.

1-3. Typical buffer circuit for rear connector data outputs. Up

to 20

mA may be used from

the DM 502 +5 V supply.

DC Voltage

Measurements

Select

an appropriate full range dc

voltage position

with the range-function

switch. Apply the

voltage

to be

measured to the

INPUT binding posts. Observe the

maximum voltage ratings as indicated on

the front panel.

The readout

displays

a

+

if the HI input is

positive with

respect to the LO

input. A

—

is displayed if

the

LO

input is

more positive. With the

input shorted, the display reads

zero. ±

one count.

DC

Current Measurements

Select an

appropriate full scale DC mA

position on the

range-function switch.

Apply the dc

current

to be

measured

to

the INPUT

binding

posts.

A current (electron

flow) into the LO

connector and out of the

HI connector

indicates

+

on display. For

opposite current flow, a

—

will

be displayed.

1-4

REV.

A,

OCT. 1974

Operating Instructions—DM 502

AC Voltage, Current and

Resistance Measurements

Select an

appropriate full scale AC VOLTS, AC mA or

OHMS position on the

range-function switch. Connect the

unknown voltage, current or

resistance to the INPUT

binding posts.

Decibel Measurements

To

use

this feature,

switch

to

an

ac

voltage or current

range and

push the button marked dB on the

front panel.

Connect the voltage or

current source

to

the DM 502. To

arrive at the correct dB

reading, algebraically add the

number on the

outside scale to the display reading. When

the dB switch is depressed, the

decimal point is fixed and

the maximum display reading is

19.99 on all scales.

For example, if the

range-function switch is

on the

2

AC

VOLTS position and the

display reading is +13.98,

then

the correct dB

reading is:

+13.98

-20

00

-

6

02 dB

If the range-function switch is

on the

200

AC mA

position and the

display

reads

-4.04,

then:

-

4.04

120.00

-15.96

dB

Selection of dB readout in dBV

or

dBm

is accomplished

by a jumper

shown in Fig. 1

-2.

The reference

for

d

BV when

measuring ac voltage is one volt

and when measuring

current one

milliampere The reference for dBm

in the

voltage range is one milliwatt dissipated in

6000 or 0.7746

volts: in the current measuring range

the reference is

0.7746 milliamperes. When dBm or dBV is applied to

current measurements, they have no significance

other

than to the reference current as stated

above.

Useful dB

formulas are:

E'

I'

p,

dB

=

20logio-r

i

,

20 logio -r-

and

10 log

t0

-=p

ti

ii

r

i

For calculations substitute the reference voltage or

current listed as the

denominator.

Temperature

Measurements

With the P6430 probe connected to the front

panel

connector

labeled TEMP

PROBE, set

the range-function

switch

to

the °F or

°C

in the TEMP position. Apply the

probe sensor tip to the device being

measured. For

optimum

temperature transfer,

coat

the surface of the

device being measured with silicone grease and apply the

probe tip squarely to the surface. Allow sufficient time

for

the probe tip to

stabilize before

taking a

reading. The time

required depends upon

several factors. Generally, when

the tip is first applied to the device under test, the readings

change rapidly. As the probe tip

temperature

approaches

the temperature of the device under test, the readings

change less rapidly, and finally stabilize. The

readings are

in

°C

or °F, depending on the position of the range-

function switch. See the

P6430

manual for

more

informa-

tion on

temperature measurements and probe

use.

Using a

Transistor as a Temperature-Sensing

Device

Certain npn transistors suchasa 2N2484 can be used

as separate

sensors

in

place of the P6430 probe with little

or no selection of the transistor. Connect the

temperature-

sensing transistor to the DM 502 through the

TEMP

PROBE connector as shown

in Fig.

1

-4.

Accuracy without

recalibration of the DM 502 is within ±8°C to 150°C. If the

Connector

shell

Connector

TEKTRONIX

Pari Number

131-1653-00

Fig.

1-4. Schematic diagram of temperature-sensing transistor

connected to probe

connector.

REV.

A, OCT.

1974

1-5

Operating Instructions—

DM 502

measurement to

be

made requires

greater accuracy,

recalibrate

the temperature circuitry or

determine a

correction factor.

Place the sensing device in an

environ-

ment

having

a

known ambient

temperature

Use

any

difference between

the known temperature and the DM

502 readout as a

correction factor throughout the

entire

measurement range.

Accurate Current

Source

The OHMS positions on the range-function switch

provide accurate (typically 0

2%)

constant currents at the

INPUT terminals

See

the Ohmmeter specifications for the

value of the currents and maximum voltages across the

INPUT

terminals for full scale display readings. The

maximum voltage available across the INPUT

terminals

in

the OHMS

position is about 10 volts.

ELECTRICAL

SPECIFICATIONS

Performance

Conditions

The electrical characteristics are

valid only if the DM

502 has been

calibrated

at

an ambient

temperature

between

4

20°

C

and

I

30°

C

and

is

operating at an

ambient

temperature between

4l5°Cand

*40°

C

Warm up time to

specified accuracy is twenty minutes.

Display

The measurement rate is 3.33 per

second. Resolution

on

all ranges

is

0.05% of full scale setting;

except for

temperature, which is

0.1°.

DC VOLTMETER

RANGES:

200 mV. 2 V, 20 V, 200

V. 1000 V.

ACCURACY:

*0.1%

of reading, ±1 count.

COMMON MODE

REJECTION:

SHOO

dB at

dc, 80

dB at 50 or 60 Hz

with

a

1 kO

unbalance.

NORMAL MODE

REJECTION:

S

80 dB at 50 or 60 Hz.

STEP RESPONSE

TIME:

$1/2 S.

INPUT RESISTANCE:

1

0

MO

-

0.25%

(jumper selectable

for

>

1

000

MO on 0.2

V and 2 V

ranges).

MAXIMUM

INPUT

VOLTAGE ON ANY RANGE:

Front Panel: 1 kV.

Rear Connector: 350 V

AC VOLTMETER

RANGES:

Voltage: 200 mV. 2 V. 20 V. 200

V, 500 V.

dB: 40, 20, 0. 20,

40. Reference is dBV (1 V)

or

dBm

(1

mW dissipated in 600 O, 0.7746 V).

ACCURACY:

Voltage:

*0.5% of reading,

'

1 count, for a 40 Hz to

10

kHz sine wave.

i 1 0% of

reading,

±

1 count, for

a

20 Hz to 20

kHz sine

wave.

Usable to

100 kHz Typically <10% down

between 40

mV and

500

V at 100 kHz.

1-6

REV. A. OCT. 1974

Operating Instructions— DM

502

DB:

MEASUREMENT CURRENT AND VOLTAGE:

Range Current

Full Scale

Voltage

Display

Frequency

Maximum

Reading

Range

200 o

1 mA

0

2V

0 to

•20

20 Hz to 20 kHz 0.5 dB

2 kO 1 mA

2

V

20 kO

lOOpA

2

V

0 to 10 20

Hz

to 2

kHz

2 kHz to 20

kHz

0.5

dB

1

0

dB

200

kO 10 pA 2 V

i n t/-« on

20

Hz

to 2

kHz

2

kHz to 7.5 kHz

0.5 dB

i n hd

2

MO

1

pA 2 V

1U lO C\J

20 MO

0.1

p

A 2

V

1

.U

Qt)

2.0 dB7.5 kHz to 20 kHz

RESPONSE TIME:

200 O through 2 MOranges,

-.'1/2

s. 20

MO

range.

<5 s.

COMMON MODE REJECTION:

60 dB at 50 or 60

Hz with

a

1 kO unbalance.

RESPONSE

TIME:

$

5 s.

IMPUT IMPEDANCE:

10 MO

±1%

paralleled by

< 60

pF.

MAXIMUM INPUT VOLTAGE ON ANY RANGE:

Front Panel:

500Vac

rms or

l

56

dBm or

600

V

dc,

not

to

exceed 1 kV dc

plus peak

ac.

Rear

Connector:

350 V dc

plus peak ac or

+50 dBm.

OHMMETER

RANGES:

200

O,

2

kO,

20

kO,

200 kO, 2 MO. 20 MO.

ACCURACY:

200

O range,

0 5%

±1 count.

+0.1

O.

2

kO through

2 MO ranges,

+0.5%, ±1 count.

20

MO range,

1.0%,

+1

count.

MAXIMUM

INPUT VOLTAGE

ON ANY RANGE:

130 V

dc and ac rms indefinitely.

250 V dc and ac rms for one-half

hour.

DC AMMETER

RANGES:

200 pA. 2 mA, 20

fnA,

200 mA. 2 A.

ACCURACY:

±0.2% of reading, ±1 count.

RESPONSE TIME:

<1/2

s.

INPUT

IMPEDANCE:

0.2 V

Q 1

0

Range Setting

except <2.0 kO on the

200 pA range

MAXIMUM

INPUT CURRENT ON ANY RANGE:

Fused

at 2.5

A.

AC

AMMETER

RANGES:

Current:

200 pA, 2 mA, 20 mA, 200 mA, 2 A.

dB:

-40,

-20,

0, 20,

40. Reference

is 1 mA (dbV) or

0.7746 mA (dBm).

REV. A. OCT.

1974

1-7

Operating

Instructions—DM

502

ACCURACY:

Current: ±0.6% of reading, ±1

count

for a 40 Hz

to 10

kHz

sine wave. Usable to 100 kHz.

DB:

Display

Reading

Frequency

Range

Maximum

0 to

+20

20 Hz to 20 kHz 0.5 dB

0

to

-10

20

Hz

to 2

kHz 0.5 dB

2 kHz to 20 kHz

1.0

dB

-10to-20

20 Hz to 2 kHz 0.5 dB

2 kHz to 7.5 kHz 1.0 dB

7.5

kHz

to 20 kHz

2.0

dB

RESPONSE TIME:

s.

INPUT IMPEDANCE:

Range

Setting

except < 2.0 KQ on the 200 /jA range.

MAXIMUM INPUT CURRENT ON ANY RANGE:

Fused at 2.5 A.

THERMOMETER

RANGES:

Centrigrade:

—55°

to

+150°.

Fahrenheit:

—67°

to

+200°.

ACCURACY:

With any P6430 probe,

±8°C

or ±14.4°F.

With instrument calibrated to probe. ±2°C or

±3.6°

F.

MAXIMUM

INPUT

VOLTAGE:

Up to

1

kV

may

be

safely applied

to the

front panel

INPUT terminals (350 V to the rear input connectors) when

the range-function switch

is

in

the

TEMP positions.

ENVIRONMENTAL SPECIFICATIONS

TEMPERATURE:

Operating:

+15°C to +40°C.

Non-operating:

—

40° C to +75°C.

POWER CONSUMPTION:

6.5

watts.

1-8

REV. A. OCT.

1974

Section

2—

DM

502

THEORY

OF

OPERATION

THEORY OF

OPERATION

Introduction

The DM 502

is basically an

analog-to-digital converter

with the logic,

display devices, and power supplies

necessary to

display, in digital form,

the value of a

dc

voltage.

The analog-to-digital converter is an integrating

amplifier. Current is

measured

by

passing the unknown

current through a known resistance

and measuring the

resultant voltage drop, using a four

terminal configura-

tion. Resistance is

measured

by

passing a constant

current through an

unknown resistance and measuring

the voltage drop

across

the

unknown resistance.

Temperature is

measured

by

obtaining a dc

voltage

proportional

to

the temperature

and measuring that

voltage.

Ac voltages and currents are rectified and

the

resulting dc is measured,

then read

out

in appropriate ac

units. The dB circuitry converts the output

of the ac

rectifier to a

logarithmic output that is applied to the

analog-to-digital converter. Refer to the

Block Diagram in

the foldout pages for an

overall view of the DM 502

operation.

Use

the following

circuit

description

with the

schematics to gain an

understanding of the operation of

the DM 502.

Attenuator and

Input Switching

The HI and

LO

binding posts are connected

across

R147,

R146 and R145 serving as a voltage divider. The

various

capacitors switched across these resistors

are

the

compensating

capacitors

used

in the

ac

modes of opera-

tion. Cl

00

is switched in series with the divider

when

the

unit is operating in the ac voltage

modes.

R105,

R106, R107,

R110 and R142 serve

as

current

shunts in the current modes. A four terminal

technique is

used.

The current

passes

through the shunts from the HI

terminal to the LO terminal. The

voltageisapplied

to

the

analog-to-digital converter through

S1

10. 17.

16,9,

15 and

18

to ground. FI

00.

in

series with shunts R

105, R106, R107

and

R1

10

along with CR1

10

and CR1

12,

protect the shunts

from over current. The diodes conduct, opening the fuse

before

the

voltage across the higher value shunts damage

them.

Lamp

RT100 protects shunt R142, in the lowest

current range, and the Ohms Converter.

Ac

Converter

In the

ac

measurement modes, the ac signal is

applied

to fet 0165. CR165 and

CR166 protect Q165 from over

voltage.

0170,

connected from the source to the drain of

Q165,

provides bootstrapping.

The

output

of Q165 is fed

to

the negative input of

U195,

an operational

amplifier. A small amount of negative dc

feedback is provided

by

R192, R 190 and the filtering

action

of

C190.

The gain

of

U195

is extremely high until CR187

and CR195 conduct.

This high

gain allows

rectification

of

extremely

small

signals.

More negative

dc

feedback is

provided through the action of CR187

and CR195. The

dc

feedback stabilizes the

operational amplifier gain and

compensates for

amplifier offset voltages or capacitor

leakage.

The positive half cycle is applied through CR195 to the

filter network.

The

dc

voltage from

the

filter

output

is

switched to the analog-to-digital converter input in

the

ac

measurement mode, and the

dB converter

in the dB mode.

The gain

of

U195 is set by

R180 and R181 to produce a

dc

output equivalent

to

the rms value of

a

sine-wave input.

DB Converter

This circuitry converts the linear dc current output from

the

ac

converter to

a

logarithmic output voltage. A

collector current change with respect to a base to emitter

voltage

change

in a

bipolar transistor is logarithmic.

VR310 serves as the voltage

reference diode

at

6.2

V.

This

voltage

is applied

to

the negative input of operational

amplifier

U210

through R203

and

R205. R205 sets

the

current through Q120A. Should the current through

Q120A increase, the voltage at pin 2

of

U210 goes

negative.

This

causes

the

output

of

U210 to go

positive

reducing the current through the transistorto the value set

by

R205. Q120A and Q120B are housed in the same case

so that their base to

emitter voltages remain constant with

temperature (for equal collector currents).

REV.

A. OCT.

1974

21

Theory

of Operation—DM 502

The rectified and filtered dc current from the ac

converter

is

applied to

the plus input of operational

amplifier U220, through R212. R212 causes a reference

current shift in the

dBm

mode

and is

shorted out

in the dBV

mode.

As pin

3

of

U220

goes positive, the output goes

positive. The

base

of Q120B goes positive and the

collector negative

providing negative

feedback.

The

collector current of Q120A always equals

the current

through R21 2 at

0

dB. The necessary voltage at the output

of

U220 is

logarithmic due

to

the logarithmic

characteristics of Q120B in the feedback loop As the

temperature increases the gain of Q120B decreases This

is compensated for by

RT220 decreasing in

value

with

increasing temperature.

Ohms Converter

U135

is an operational amplifier. The current setting

resistances

are

connected

from

the output

to the plus

input terminal of

U135.

The unknown resistances are

connected from the plus terminal to

floating ground.

See

Fig.

2-1. Negative feedback

occurs

from

the

output of

U135 to the

negative input terminal. R

130

is the calibration

adjustment.

R135

and R136 are switched in and out of the

negative feedback loop to provide bias current compensa-

tion.

The value of the current setting resistance

is always

equal to one

half

of the

full scale measurement value,

except on the 200 O range, as shown on

the range-

function switch. The

200 Q scale uses 1 kfi and the gain of

the analog-to-digital converter is increased

by a

factor of

ten. R130 adjusts the gain of the amplifier

to

produce one

volt across the current setting resistance

(0.1

V

in

the

200

Q range). As long

as the

unknown

resistance is within the

measurement range, the circuitry adjusts the current so

that the drop

across the

current

setting

resistance

is one

volt.

This

current flows through the unknown resistance,

varying the voltage

at the

plus terminal of

U135.

This

voltage is then

fed

to the analog-to-digital converter input.

Temperature Measurement Circuitry

This circuitry operates on the principle that

a

change in

base to emitter

voltage of

a

bipolar

transistor is propor-

tional

to

the temperature of the junctionasthe collector

current

is changed

between

two

levels.

A

square

wave

(about 2 kHz) is generated by Q230 and

Q235 operating as an astable multivibrator. The square

wave is

applied

to the gates of Q255 and Q260.

The collector to base voltage of the temperature

sensing transistor in the probe is held constant. When fet

Q255 is off, the current to the probe through R255 and

R257

is approximately one-tenth the on current.

Fig.

2-1. Simplified

diagram of Ohms

Converter.

2-2 REV.

A, OCT.

1974

Theory of Operation—

DM 502

When Q230 is off and Q235 is on. Q255 is off and

the

voltage

at pin 2

of

U250A goes

negative.

The output

of

U250A goes positive, reducing the temperature-variable

base-emitter

current

of

the

sensing

transistor until pin 2 of

U250A is at ground. A positive-going square wave results

at the output of U250A,

with an

amplitude proportional to

the temperature of the base-emitter junction.

Q260

is

on

and Q245 is off.

due to

the action of

Q230 and Q235 A dc

voltage,

whose amplitude

is

proportional

to temperature,

occurs

across C263 The opposite occurs when 0230 and

Q235 change state, with the exception that Q245 turns on,

shorting the negative voltage

to

ground; and

Q260

is

off,

preventing the discharge of

C263.

The

dc voltage across

C263 is applied to operational amplifier U250B R280

adjusts the

gain.

Offset voltage in

U250B is

compensated

for

by

R270. R268

and

R285,

through

S1 10,

44, change

offset and increase gain for

°

F readout vs

°

C.

The

output

of U250B at 10 mV/° is applied to the analog-to-digital

converter input and

the

rear interface

connectors

Analog-To-Digital Converter

U290 comprises the analog-to-digital converter and

U335 contains the necessary control logic.

U290

contains

the integrating amplifier,

comparator, auto-zero amplifier

and input buffer amplifier. See Fig.

2-2.

C300

is the

integrating capacitor. The clock frequency

is divided by

the time base counter into groups

of 6144 pulses.

Measurement

takes place

for

4096 of these pulses and

automatic zeroing takes place for

2048

pulses. The

auto-

zeroing feature provides current to

compensate for offset

currents

in the buffer amplifier.

Basic sensitivity of the analog-to-digital converter

is 2 V

for

a

full scale

display reading. When

S1 10,

36 is closed,

the sensitivity becomes

0.2

V full

scale.

Clock

U325 is a

monolithic timing circuit used to

generate the

clock

frequency for the DM 502 The

frequency is

20.48 kHz. C330.

the timing capacitor, charges through

R328, R329 and

R330, and discharges through

R330.

R328

sets the

frequency

so

that it is a

multiple of

the

power

line

frequencies. This insures

minimization of

line

frequency

interference in the

analog-to-digital converter.

During auto zero, the input

of the buffer amplifier is

grounded. The buffer offset

current also offsets the output

of the integrator.

The

offset

at the integ rator output

passes

through

a

low-pass filter

comprised of

C300,

R300

and

R302

to the

plus

input of the auto-zero amplifier. The

output of the unity gain

auto-zero

amplifier

compensates

for this offset current

at

the

summing node (pin

9)

at the

integrator

input.

The

reference current through R304

and

R305 from the reference current

source, is applied for four

clock

cycles

and disconnected for the next four

cycles by

the

U/D control logic. The

reference

current is connected

to R304 when the up-down logic

is low. Equilibrium for the

•i ».

Fig.

2-2.

Analog

to digital converter and control

logic

block

diagram. Reprinted by permission ot Slllconix

Inc.

REV. A,

OCT.

1974

2-3

Theory ol Operation—DM

502

entire integrating and auto-zero system is obtained when

the sum of the average

currents

at

the integratorsumming

junction equals zero.

C316

charges to the equilibrium

voltage and maintains this voltage at the auto-zero

amplifier input during the

measurement interval when

the

switch from the integrator output is

open. See

Fig.

2-3

for

functional timing during the auto-zero interval. Notice that

the fifty percent duty

cycle

of the up-down counter is

overridden at the start of the auto-zero interval. This

override period permits the output of the integrator

to

come

to V,„,

and

C316 to

assume this voltage.

Upon completion

of

the

2048 clock pulse auto-zero

interval, the measurement interval commences. The

measure-zero logic switches the analog input voltage to

the buffer input and disconnects the integrator

output

from

the

auto-zero

amplifier

input.

The

additional

current

resulting

at the summing junction of the integrator causes

the integrator output voltage to move away from the

equilibrium

voltage

obtained during auto-zero

interval

and maintained

during the measurement

interval

by C316.

The comparator senses and transmits this deviation to the

control logic. The control logic changes the duty cycle of

the reference voltage in an attempt to re-establish

equilibrium at the integrator summing junction. The

up-

down logic

is up

(integrator

output

voltage

is

also

up)

for

one clock cycle and down for seven cycles when the

comparator output was high during the preceding

set

of

eight clock cycles. This is shown as duty

cycle

A in

Fig.

2-

4. When the comparator

output

is low

in

clock cycle seven,

the up-down logic is

up

for seven cycles and down for one

cycle during the following eight clock cycles.

This

is

shown as duty cycle B. Fig.

2-4

shows the result of these

actions on the integrator

output.

A counter, synchronous with

the

up-down logic,

in-

crements

by

each clock pulse when the up-down logic

is

up and

decrements

by each clock pulse when

the

up-down

logic is down. The net count increases by six counts for

each B duty cycle and decreases by six counts for each A

duty cycle,

to a

maximum

count of about 3100.

This

counting procedure is reversed for negative input

voltages.

Polarity

of the input voltage is

determined by the state

of

the up-down logic when the

bed

counter

state

is

zero.

This information is stored in

a

flip-flop

and loaded into the

static latch once each measure-zero cycle.

The

bed

counter accumulates

a number of counts

proportional

to

the

input voltage during the

measure

interval

while the control logic works to maintain

equilibrium. It can be seen that equilibrium

is

achieved

in

steps and usually a residual voltage remains at the

end of

the

measurement

cycle. This residual voltage is

compen-

sated

for

by a short override interval at the beginning of the

auto-zero period. The counter continues until

the in-

tegrator output equals the auto-zero equilibrium voltage

and the up-down logic is down. The

bed

counter

is now

put on

hold and

its

contents

loaded into the latches. The

counter is then cleared.

even ’ o i

i )

i » i > • t

i i

i

t « > t

i

> j « i i r •ii )it i > o

"1

c<M»Aft*ro«

Fig.

2-3.

Auto-zero timing intervals. Reprinted by permission of Siliconix

Inc.

2-4

Theory of Operation—DM 502

Fig.

2-4. Measurement Interval timing. Reprinted by

permission ot Silicon!*, Inc.

Display

The bed

data from the data

buffers is applied to U340. a

bed to

seven segment decoder.

All segments of

digits

one,

two and three

are connected in

parallel

to U340.

The

high

outputs from

the digit

buffers are inverted by U345A. B. C

and D,

which drive Q350

for digit one, Q355 for

digit two.

Q360

for digit three and Q365

for the most significant

digit.

When the

collectors of these

transistors are high, the

particular

digit is displayed.

This is accomplished

in

a

one.

three, two, four sequence.

The common

terminal for the

polarity signs is

also activated by Q365

at the most

significant

digit time.

S1

1 0. 37, 38

and

S200

disconnect

the

polarity signs when not

appropriate for the

measurement

mode in use. S200

is on the dB

switch. When pin 5 of U335

is

high the positive

sign is lighted. When pin 5

of

U335

is

low, the

negative sign is illuminated by

the action of Q375

and

U345F.

The

decimal positions are

changed

by

contacts

in the

range-function and dB

switches

through Q370. As pin 16

of

U335

is the

bed

one line to

the seven

segment decoder,

when

the

most

significant

digit is present, pin 16 is

high.

This

is

converted to a low

and connected to the

cathodes

of the

ones segments in the most

significant

digit module

The contents of the static

latches are

multiplexed to the

data output buffers.

The data output format is

an interlac-

ed scan

of digits one, three, two

and four Four is the most

significant digit. With a

count of 2000 or

greater in the

counter (100% of

full scale)

the 3-1/2 digit display blinks

off during the zero

cycle.

Power

Supplies

The entire DM

502 circuitry,

with the

exception of the

temperature circuitry

can be elevated up

to IkV above

chassis ground.

Isolation

is accomplished

with

transformer

T410. 50 V ac

from the power

module (two 25

V ac

windings in

series) is

applied to the

transformer

primary.

Ac for the

15 V and t12 V

supplies is

bridge

rectified. U420.

for the

±12 V supplies, is a

dual tracking

voltage

regulator. R418

is a current

shunt for the

+12 V

supply and

R427 is the

same for the

—12

V

supply. R422

sets the

levels U420 is

internally protected

against

short

circuit damage.

Power for the

display

modules

is

not

electronically

smoothed,

regulated or

filtered

Q440 serves as

the series pass

transistor

for the

15

V

supply. The output

voltage

is set

through the divider

consisting of

R452 and R453

connected to

the base

of

Q450.

Should

the

-5

V output

drop, Q450

increases

conduction.

This causes

Q440

to

also increase

conduc-

tion restoring

the output

voltage to the

preset

level

The

temperature

measuring circuitry

obtains ±15 V

from ±33 5 V

through

zener diodes VR400 and

VR405.

@

2-5

Section

3-

DM 502

REPLACEABLE

ELECTRICAL

PARTS

PARTS ORDERING

INFORMATION

Replacement parts are availablefrom

or through your local Tektronix, Inc. Field

Office

or representative.

Changes

to

Tektronix instruments

are sometimes made

to

accommodate Improved

components as

they become available, and to

give

you

the benefit of the latest circuit

improvements

developed in our engineering

department It is therefore important, when

ordering parts, to

Include the following

information in your order: Part number, instrument

type

or number, serial

number, and modification number if

applicable.

If a part you

have ordered has been

replaced with

a

new or improved part, your

local

Tektronix, Inc. Field

Office or representative

will

contact you

concerning any change in part

number

Change information, if

any, is located at the rear of this

manual.

SPECIAL

NOTES AND SYMBOLS

X000 Part

first

added

at this serial number

OOX Part

removed after this serial number

ITEM NAME

In

the Parts List, an Item Name is

separated from the description

by

a colon

(:).

Because

of

space

limitations, an Item Name may sometimes appear as

incomplete For

further Item Name

identification, the

U.S.

Federal

Cataloging Handbook H6-1 can be

utilized

where possible.

ABBREVIATIONS

ACTR

ACTUATOR

PLSTC PLASTIC

ASSY

ASSEMBLY

OTZ

QUARTZ

CAP CAPACITOR

RECP

RECEPTACLE

CER CERAMIC

RES

RESISTOR

CKT

CIRCUIT

RF RADIO

FREQUENCY

COMP

COMPOSITION SEL

SELECTED

CONN CONNECTOR

SEMICOND

SEMICONDUCTOR

ELCTLT ELECTROLYTIC

SENS

SENSITIVE

ELEC

ELECTRICAL

VAR VARIABLE

INCANO INCANDESCENT

WW

WIREWOUND

LED

LIGHT

EMITTING DIODE XFMR

TRANSFORMER

NONWIR NON

WIREWOUND XTAL

CRYSTAL

3-1

Electrical Parts List—DM 502

CROSS INDEX MFR. CODE NUMBER TO MANUFACTURER

MFR.CODE MANUFACTURER ADDRESS

00853

01121

01295

03508

03888
04713

07263

07910

14752
15281

15454

15818
17856
18324
19396

27014

28480

34553

49956

50522

56289

58474

71400

71590

71744

72982
73138

75042

80009

80031

80294
81483

86684

90201

91637

SANGAMO

ELECTRIC

CO.,

S. CAROLINA DIV.

ALLEN-BRADLEY CO.

TEXAS INSTRUMENTS, INC.,

SEMICONDUCTOR

GROUP

GENERAL ELECTRIC CO.,SEMI-CONDUCTOR

PRODUCTS DEPT.

KDI PYROFILM CORP.

MOTOROLA, INC.,

SEMICONDUCTOR

PRODUCTS DIV.

FAIRCHILD

SEMICONDUCTOR,

A

DIV. OF

FAIRCHILD

CAMERA AND INSTRUMENT CORP.

TELEDYNE SEMICONDUCTOR

ELECTRO CUBE INC.
GENERAL

INSTRUMENT CORP., DELETED,

BUSINESS DISCONTINUED

RODAN INDUSTRIES,

INC.

TELEDYNE SEMICONDUCTOR

SILICONIX

,

INC.

SIGNETICS CORP.

ILLINOIS TOOL

WORKS,

INC.,

PAKTRON DIV.

NATIONAL SEMICONDUCTOR CORP.

HEWLETT-PACKARD CO.,

CORPORATE

HQ.

AMPEREX

ELECTRONIC CORP., COMPONENT DIV.

RAYTHEON CO.

MONSANTO CO., ELECTRONIC

SPECIAL

PRODUCTS

SPRAGUE ELECTRIC

CO.

'

SUPERIOR ELECTRIC CO., THE

BUSSMAN MFG

. ,

DIVISION OF MCGRAW-

EDISON CO.

CENTRALAB ELECTRONICS, DIV. OF

GLOBE-UNION, INC.

CHICAGO MINIATURE LAMP

WORKS

ERIE

TECHNOLOGICAL PRODUCTS, INC.

BECKMAN INSTRUMENTS,

INC., HELIPOT DIV.

TRW ELECTRONIC

COMPONENTS,

IRC

FIXED

RESISTORS, PHILADELPHIA DIVISION

TEKTRONIX, INC.

ELECTRA-MIDLAND

CORP., MEPCO DIV.,

A

NORTH AMERICAN PHILLIPS CO.

BOURNS, INC., INSTRUMENT

DIV.

INTERNATIONAL

RECTIFIER CORP.

RCA CORP.,

ELECTRONIC COMPONENTS

MALLORY

CAPACITOR

CO.,

DIV. OF

P. R.

MALLORY CO., INC.

DALE ELECTRONICS, INC.

P. 0. BOX

128

1201 2ND ST.

SOUTH

P. O. BOX 5012

ELECTRONICS

PARK

60 S. JEFFERSON RD.

5005 E.

MCDOWELL RD.

464 ELLIS ST.

12515

CHADRON AVE.

1710 S. DEL MAR AVE.

2905 BLUE

STAR

ST.

1300 TERRA BELLA AVE.

2201

LAURELWOOD

RD.

811 E. ARQUES
1321 LESLIE AVE.
2900 SAN YSIDRO

WAY

1501 PAGE MILL RD.

35

HOFFMAN AVE.

141 SPRING ST.

10131

BUBB

RD.

383 MIDDLE ST.

2536 W.

UNIVERSITY

ST.

5757 N. GREEN BAY AVE.
4433 RAVENSWOOD AVE.

644 W. 12TH ST.
2500 HARBOR

B1VD.

401 N. BROAD ST.

P. O. BOX 500

22

COLUMBIA RD.

6135 MAGNOLIA AVE.
9220 SUNSET B1VD.

415 S. 5TH ST.

3029 E.

WASHINGTON ST.

P.

0.

BOX 609

CITY,STATE,ZIP

PICKENS, SC 29671

MILWAUKEE,

WI 53204

DALLAS, TX 75222

SYRACUSE, NY 13201
WHIPPANY, NJ 07981

PHOENIX, AZ 85036

MOUNTAIN

VIEW,CA94042

HAWTHORNE, CA 90250
SAN GABRIEL, CA 91776

ANAHEIM, CA 92806

MOUNTAIN VIEW, CA 94040

SANTA CLARA, CA 95054

SUNNYVALE,CA94086
ALEXANDRIA, VA 22301
SANTA CLARA, CA 95051

PALO ALTO, CA

94304

HAPPAUGE, NY

11787

LEXINGTON, MA 02173

CUPERTINO, CA 95014

NORTH ADAMS,

MA 01247

BRISTOL, CT 06010

ST. LOUIS, MO

63107

MILWAUKEE, WI 53201
CHICAGO, IL 60640

ERIE, PA 16512

FULLERTON, CA

92634

PHILADELPHIA, PA 19108
BEAVERTON, OR

97077

MORRISTOWN, NJ 07960

RIVERSIDE, CA 92506
LOS ANGELES, CA 90069
HARRISON, NJ

07029

INDIANAPOLIS, IN 46206
COLUMBUS, NB 68601

3-2

REV. B JAN. 1975

Electrical Parts List—DM

502

Ckt No.

Tektronix

Port No.

Serial/Model No.

Eff Dscont

Name

&

Description

Mfr

Code Mfr

Part Number

A1

670-3495-00

B010100

B019999 CRT

BOARD ASSY: MAIN

80009

670-3495-00

A1

670-3495-01 B020000

CKT BOARD

ASSY :MAIN

80009

670-3495-01

A1

670-3694-00

B010100

B019999 CKT BOARD

ASSY: MAIN OPTION 2

80009

670-3694-00

A1

670-3694-01 B020000

CKT BOARD ASSY :MAIN OPTION 2

80009

670-3694-01

A2

670-3509-00

CKT BOARD ASSY:

DISPLAY

80009

670-3509-00

C100

285-1106-00

CAP

.

,FXD ,PLSTC

:

0 .

22UF

, 20*

, 600V

14752 230B1F223

C110

283-0279-00 XB020000

CAP.

,FXD,CER DI:0.001UF,20»,

3000V

72982 878YSS102M

C120

290-0536-00

CAP. ,FXD,ELCTLT:100F,20*,25V

90201 TDC106M025NLF

C130

283-0003-00

CAP. ,FXD,CEP.

DI:0.01UF, +80-20*, 150V

72982 855-547E103Z

C142

283-0626-00 CAP., FXD,

MICA D:1800PF,5*,500V

00853 D195E182J0

C146

283-0626-00

CAP., FXD,MICA D:1800PF

,5»,500V

00853 D195E182J0

C150

281-0182-00

CAP

.

, VAR,PLSTC : 1 . 8-10PF ,

300V

34553

2222-809-05002

C151

281-0515-00 CAP. ,FXD,CER

DI :27PF .+/-1.35PF

,500V

72982 3O2-OOOCOG027OJ

C152

281-0564-00

CAP. ,FXD,CER

DI:24PF ,5*, 500V

72982

3O1-OOOCOG0240J

C154

281-0579-00

CAP., FXD, CEP.

DI:21PF,5»,500V

72982 301-050COG0210J

C15S

281-0184-00 CAP.

,VAR,PLSTC:2-18PF ,500VDC

34553

2222-809-05003

C157

285-0596-00

CAP. , FXD,PLSTC :0.01UF ,1*, 100V

56289

490P10311

C158

285-0719-00

CAP

.

, FXD .PLSTC :

0

.015UF , 5* ,

100V

56289 410P113

C168

283-0003-00

CAP.

,FXD,CER DI:0.01UF,

+80-20*, 150V 72982

855-547E103Z

C170

283-0003-00

CAP. ,FXD,CER DI:0.010F,

+80-20*, 150V 72982

855-547E103Z

C175

290-0535-00

CAP

. ,

FXD

,

ELCTLT : 3 3UF

,

20*

,

10\'

56289

196D336X0010KA1

C190

290-0527-00 CAP. ,FXD,ELCTLT:15UF

,

20*

,20V

90201

TDC156M020NLF

C192

281-0661-00

CAP

.

,FXD ,CER DI:0.8PF

.+/-0.1PF ,500V

72982

3O1-000C0GO808B

C195

290-0723-00

CAP.,FXD,ELCTLT:150UF , 20*,

6VDC,DIPPED TANT

56289 196D157X0006PE3

C197

290-0525-00 B010100

B019999 CAP. , FXD,

ELCTLT

:4

.7UF ,20* ,50V

56289

196D475X0050KA1

C197

290-0536-00 B020000

CAP.

,FXD,ELCTLT:10UF,20*,25V

90201

TDC106M025NLF

C198

290-0536-00 B010100 B019999

CAP

.

, FXD.ELCTLT:

10UF , 20* , 25V

90201

TDC106M025NLF

C198

290-0527-00 B020000

CAP.

,FXD,ELCTLT:15UF,20»,20V

90201 TDC156M020NLF

C199

290-0512-00

B010100

B019999 CAP.

, FXD,ELCTLT:22UF, 20*,

15V 56289

196D226X0015KA1

C199

290-0535-00

B020000

CAP

.

,FXD,

ELCTLT: 33UF, 20*, 10V

56289

196D336X0010KA1

C208

281-0513-00

CAP. ,FXD,CER

DI:27PF .+/-5.4PF

,500V 72982 301-000P2G0270M

C220

283-0065-00 CAP. ,FXD,CER

DI

: 0 . 001UF

,

5*

, 100V

72982 805-505B102J

C230

1

283-0065-00 CAP

.

,FXD,CER DI : 0 .

001UF ,

5*

, 100V

72982 805-505B102J

C235

1

283-0065-00

CAP. ,FXD,CER DI :

0

. 001UF ,

5*

,

100V

72982 805-505B102J

C251

1

281-0546-00 CAP. ,FXD,CER DI :

330PF

, 10*

, 500V

72982 301-0O0X5P0331K

C253

283-0114-00 CAP. ,FXD,CER DI

:0.0015UF ,5*, 200V

72982 805-509B152J

C254

283-0114-00

CAP

.

,FXD,CER DI :0 .0015UF ,5*,

200V

72982 805-509B152J

C257*

283-0065-00 CAP.

,FXD,CER DI :

0

. 001UF ,

5*

, 100V

72982

805-505B102J

C260

1

285-0808-00

CAP.,FXD,PLSTC :0.1UF,

10*, 50V

56289

LP66A1A104K004

C263

290-0536-00

CAP ., FXD , ELCTLT : 10UF , 20* ,

25V

90201 TDC106M025NLF

C265

1

283-0065-00

CAP. ,FXD,CER DI :0.001UF

,5*,100V

72982 805-505B102J

C270*

290-0525-00

CAP

.

, FXD , ELCTLT : 4

.

7UF , 20*

, 50V

56289

196D475X0050KA1

C285*

283-0001-00

CAP. ,FXD,CER DI:0.005UF,

+100-0*, 500V

72982 831-559E502P

C287

1

283-0065-00 CAP. ,FXD,CER

DI :0.001UF ,

5*

, 100V

72982

805-505B102J

C291

285-1101-00

CAP., FXD, PLSTC :0. 022

UF, 10*, 200V

19396 PT485-022-200-10

C300

285-1101-00 CAP. ,FXD,PLSTC :0 .022

UF, 10*,

200V 19396 PT485-022-200-10

C310

290-0536-00

CAP.

,FXD,ELCTLT:10UF,20*,25V 90201

TDC106M025NLF

C312

290-0525-00 CAP

. ,

FXD

,

ELCTLT : 4 . 7UF

,

20*

,

50V 56289

196D475X0050KA1

C315

281-0205-00 CAP

.

,

VAR , PLSTC : 5.

5

-6 5PF , 100V

80031 C010GA/60E

C316

285-1102-00

CAP. , FXD,PLSTC

:0.1UF,20»,100VDC, REEL PKG 19396

PT720B104M

C320

290-0536-00 CAP

.

, FXD

, ELCTLT : 10UF , 20* , 2 5V

90201

TDC106M025NLF

C325

290-0512-00

CAP

.

,FXD , ELCTLT : 22UF, 20* ,

15V

56289

196D226X0015KA1

C330

283-0626-00 CAP. , FXD,MICA D :

1800PF ,

5*

, 500V

00853 D195E182J0

1

Remove for Option 2.

REV.

C FEB.

1975

3-3

Electrical

Parts

List—

DM 502

Tektronix Serial/Model

No.

Mfr

Ckt No. Part No. Eff

Dscont Nome &

Description

Code

Mfr Part Number

C400

1

290-0525-00 CAP. ,FXD,ELCTLT:4.7UF,20%,50V

56289 196D475X0050KA1

C40S

1

290-0525-00

CAP., FXD,ELCTLT:4.7UF, 20%, 50V 56289 196D475X0050KA1

C410

290-0725-00

CAP

.

, FXD

,

ELCTLT : 1000F

,

+75-10%

,

50VDC

,

AL 90201 TT101V050C1J3P

C412

290-0725-00

CAP. , FXD,ELCTLT:100UF,+75-10%, SOVDC.AL 90201 TT101V050C1J3P

C420

290-0525-00 CAP. ,FXD,ELCTLT:4 .7UF,

20% ,

50V 56289

196D475X0050KA1

C425

290-0525-00 CAP. , FXD,

ELCTLT

:4

.7UF ,20%,

50V

56289 196D475X0050KA1

C429

283-0279-00 XB010280

B019999X

CAP

.

, FXD

,

CEP

DXlO.OOlOr,20%,

3000V 72982 878Y5S102M

C437

290-0727-00

CAP. , FXD, ELCTLT :300UFD,

+75-10%,

25VDC,AL 90201 TT301V025D1J3P

C440

290-0573-00

CAP.,FXD, ELCTLT: 2. 7UF, 20%, 50V 56289 196D275X0050JA1

C442

290-0525-00

CAP

.

,FXD , ELCTLT : 4

.

70F , 20% , 50V 56289 196D475X0050KA1

C444

283-0080-00 CAP. ,FXD,CER

DI:0.022UF,

+80-20%, 25V

56289 19C611

CR100

152-0107-00 SEMICOND DEVICE

:

SILICON, 375V.400MA 80009

152-0107-00

CR110

152-0585-00

SEMICOND DEVICE : SILICON , BRIDGE , 75V

,

75MA 15281 W02M

CR136

152-0246-00

SEMICOND DEVICE : SILICON, 400P

IV,

200MA

07910

CD12676

CR165

152-0246-00 SEMICOND DEVICE : SILICON , 400PIV , 200MA

07910

CD12676

CR166

152-0246-00

SEMICOND

DEVICE:SILICON,400PIV,200MA 07910

CD12676

CR187

152-0322-00 SEMICOND DEVICE: SILICON, 15V 28480

5082-2672

CR195

152-0322-00

SEMICOND DEVICE: SILICON, 15V

28480 5082-2672

CR230

1

152-0141-02 SEMICOND DEVICE: SILICON, 30V, 150MA 07910 1N41S2

CR23S

1

152-0141-02 SEMICOND DEVICE: SILICON, 30V,150MA

07910

1N4152

CR237

1

152-0141-02 SEMICOND DEVICE : SILICON

,

30V

,

150MA

07910

1N41S2

CR240

1

152-0141-02 SEMICOND DEVICE : SILICON , 30V , 150MA 07910 1N4152

CR334

152-0141-02 SEMICOND DEV

ICE :

SILICON

,

30V

,

150MA 07910 1N4152

CR410

152-0585-00 SEMICOND DEVICE:

SILICON,

BRIDGE, 75V, 75MA 15281 W02M

CR430

152-0585-00 SEMICOND DEVICE: SILICON,BRIDGE,

75V,

75KA 15281

W02M

CR435

152-0107-00 SEMICOND

D

EVICE

:

SILICON, 375V, 4 OOMA 80009

152-0107-00

DS350

150-1022-00 LAMP , LED : RED 50522 MAN72

DS355

150-1022-00 LAMP, LED: RED 50522 MAN72

DS360

150-1022-00 LAMP

,

LED

: RED 50522 MAN72

DS365

150-1021-00 LAMP, LED: RED 50522

MAN73

FlOO

159-0126-00 FUSE,CARTRIDGE:2.5A,250 VAC,

FAST-BLOW

71400 AGC2-1/2

J100

129-0064-01

POST , BDG , ELEC : RED ,

5

-WAY

MINIATURE

58474 BB10167G2BX

J110

129-0064-00 POST, BDG,ELEC:CHARCOAL,5-WAY MINIATURE

58474 BINP

BB10167G13T

J115

129-0064-02 POST

, BDG , ELEC

:

WHITE

,

5

-WAY .MINIATURE

58474

DF21WTC

J250

1

131-1652-00

CONN,

RCPT,

ELEC :1 FEM,1

MALE CONTACT 000OA RA0302

Q165

151-1005-00 TRANSISTOR : SILICON

,

JFE

,

N-CHANNEL 15818 U1490

Q170

151-0188-00 TRANSISTOR: S ILICON, PNP

04713

2N3906

Q230

1

151-0341-00 TRANS

ISTOR

: SILICON , NPN

07263

2N3565

Q235

1

151-0341-00 TRANS

ISTOR :

SILICON , NPN 07263 2N3565

Q245

1

151-1005-00

TRANSISTOR : S ILICON , JFE

, N-CHANNEL 15818 U1490

Q255* 151-1005-00 TRANS

ISTOR

:

SILICON

,

JFE

,

N-CHANNEL 15818

U1490

Q260

1

151-1005-00 TRANSISTOR : SILICON

,

JFE,N-CHANNEL

15818

U1490

Q3SO

151-0301-00 TRANSISTOR : SILICON

,

PNP 04713 2N2907A

Q355

151-0301-00

TRANSISTOR : SILICON , PNP

04713

2N2907A

Q360

151-0301-00 TRANS

ISTOR

: S

ILICON

,

PNP 04713 2N2907A

Q365

151-0301-00 TRANSISTOR : SILICON

,

PNP 04713 2N2907A

Q370

151-0302-00 TRANS

I

STOR

:

SIL ICON

,

NPN 04713 2N2222A

Q375

151-0341-00 TRANSISTOR : SILICON , NPN 07263 2N3565

Q380

151-0281-00 TRANSISTOR : SILICON, NPN

03508 X16P4039

Q440

151-0134-00 TRANSISTOR

: SILICON

, PNP 04713 2N2905A

Q450

151-0341-00 TRANSISTOR : SILICON, NPN

07263

2N3565

'“Remove for

Option

2.

3-4

REV. C FEB. 1975

Electrical

Parts List—

DM

502

Ckt No.

Tektronix

Port No.

Serial/Model

No.

Eff

Dscont

Name &

Description

Mfr

Code Mfr Part

Number

R95

315-0102-00

RES.

,FXD,CMPSN:1K OHM,5*,0.25W

01121 CB1025

R100

315-0101-03

RES

.

, FXD,CMPSN : 100

OHM,5*,0.25W

01121 CB1015

R105

321-0895-07

RES.,FXD.FIIM:90 OHM, 0.1* ,0.

125W

91637 MFF1816C90ROOB

R106

308-0772-00 RES

.

, FXD

,WW:9 OHM,0.1*,3W

73138 91A20R00M

R107

308-0770-00

RES. ,FXD,WW:1 OHM, 0.1*, 3

W AXIAL LD 91637

RLS286-B1R000B

R110

308-0769-00 RES

.

,FXD,WW:0. 1

OHM,0.1*,3W 4 TERM 91637

RLS2B6-BR1000B

R120

321-0184-00 RES.,

FXD,FILM:806

0HM,1*,0.125W 75042

CEATO-8060F

R124

321-0365-00

RES.

,FXD,FILM:61.9K

OHM,1*,0.125W 75042 CEAT0-6192F

R128

321-0285-00 RES.

,FXD,FILM:9.09K OHM ,

1*

,0 .

125W 75042

CEAT0-9091F

R130

311-1749-00

RES.

,VAR,NONWIR:TRMR,1.5K

OHM.0.75W 73138 91AR1500M

R135

307-0465-00 RES. , FXD,FILM:

10M 0HM,1*,0.5W

03888 FL1/2-105F

R136

321-1485-00 RES. , FXD,

FILM: 1.11M OHM,

1*

,0.

125W 75042

CEAT0-1114F

R140

321-0481-04

RES. , FXD,FILM: 1M

OHM,0.1*,0.125W

91637 MFF1816D10003B

R142

308-0541-00 RES . FXD

, WW : 1 K

OHM,0.1*,3W AXIAL LD

91637 RS2B-B10000B

R145

I

R146

1

325-0186-00

RES. ,SET,MTCH:9.9M

OHM.90K OHM.lOK

OHM 80009

325-0186-00

R147|

R155

311-1564-00

RES.

,VAR,NONWIR:500 OHM,20*,0.50W

73138

91A-500R0M

R157

321-0292-03

RES. ,FXD,FILM:10.7K

OHM,0.25*,0.125W

91637 MFF1816D70101C

R165

301-0104-00

RES. , FXD,CMPSN :100K

0HM,5*,0.5W 01121

EB1045

R168

315-0682-00

RES. ,FXD,CMPSM:6.8K

OHM,5»,0.25W

01121 CB6825

R170

315-0102-00

RES., FXD, CMPSN: IK

0HK,5*,0.25W

01121 CB1025

R172

321-0385-00 RES.,

FXD, FILM :100K

OHM,1»,0.125W

75042 CEAT0-1O03F

R174

321-0978-01

RES.,FXD,FILM:11.02K

OHM,0.50*,0.125W

91637 MFF1816G11021D

R175

311-1565-00

RES.

,VAR,NONWIR:250 OHM, 20*, 0.

SOW 73138

91A25OR0M

R179

321-0287-00

RES.

,FXD,FILM:9.53K OHM,1»,0.125W

75042 CEAT0-9531F

R180

311-1563-00

RES.,VAR,N0NWIR:1K OHM , 20* , 0 .

SOW 73138

91A-10000M

R181

321-0066-00 RES

.

,FXD,FILM:47 .5

OHM,1*,0.125W

75042 CEAT0-47R50F

R185

321-0193-00

RES. ,FXD,

FILM: IK OHM,1*,0.

125W 75042

CEAT0-1001F

R187

321-0193-00

RES.

,FXD,FIIM:1K

OHM,1*,0.125W 75042

CEATO-IOOIF

R190

315-0104-00 RES.

, FXD,CMPSN:100K

OHM,5»,0.25W

01121 CB1045

R192

315-0104-00

RES., FXD,

CMPSN :100K

OHM,5*,0.25W 01121 CB1045

R197

321-0276-00

RES. , FXD, FILM :7.32K

OHM,1*,0.125W

75042 CEATO-7321F

R198

321-0219-00

B010100 B019999

RES., FXD,

FILM :1.87K

OHM,1*,0.125W

75042 CEAT0-1871F

R198

321-0202-00

B020000

RES. , FXD,FILM:

1.24K OHM,1*,0.125W

75042 CEAT0-1241F

R199

321-0219-00

B010100 B019999

RES.

,FXD,FILM:1.87K

OHM,1*,0.125W

75042 CEAT0-1871F

R199

321-0202-00

B020000

RES. ,

FXD, FILM: 1.24K

OHM,1*,0.125W

75042 CEAT0-1241F

R200

321-0202-00

XB020000

R£S.,FXD,FILM:1.24K OHM.l* ,0. 125W

75042

CEAT0-1241F

R203

321-0473-00 RES.

,FXD,FIIM:825K

OHM,1*,0.125W 75042

CEAT0-8253F

R205

311-1554-00

B010100

B010369

RES

.

,VAR,NONWIR

:200K

OHM,20*,0.50W

73138 91A-20002M

R205

311-1553-00

B010370

RES.

,VAR,NONWIR:250K OHM,20*,0.50W

R208

315-0102-00

RES.

,FXD,CMPSN:1K

OHM,5*,0.25W

01121 CB1025

R210

315-0914-00

RES. , FXD,

CMPSN :910K

0HM,5*,0.25W 01121 CB9145

R212

321-0242-00

RES.

,FXD,FILM:3.24K

OHM,1*,0.125W 75042

CEAT0-3241F

R215

311-1554-00

RES.

,VAR,NONWIR:200K

OHM,20*,0.50W 73138

91A-20002M

R217

321-1485-00

RES.,FXD,FILM :1.11M

OHM,1*,0.12SW

75042 CEATO-1114F

R218

321-0179-00 RES.

, FXD,FILM: 715 OHM ,1*,0.

125W

75042 CEATO-7 150F

R220

321-0370-00

RES

.

,FXD

.FILM .-69.8K OHM

,

1* ,0 .

125W

75042 CEAT0-6982F

R224

321-0689-00 RES.

,FXD,FILM:24.9K OHM,0.5*,0.125W

75042 CEAT0-2492D

R225

321-1657-01

RES. , FXD,

FILM: 67 3. 7

OHM,0.5*,0.125W 91637

MFF1816G673R7D

R230*

315-0103-00

RES. ,FXD,

CMPSN: 10K

OHM,5»,0.25W 01121 CB1035

R232

*

315-0474-00 RES.,FXD,CMPSN :470K

OHM,5»,0.25W

01121 CB4745

R235

1

315-0474-00

RES.,FXD,CMPSN :470K

OHM,5»,0.25W

01121 CB4745

^Remove for Option 2.

REV. C FEB.

1975

3-5

Electrical

Parts

List—DM

502

Ckt No.

Tektronix

Port No.

Serial/Model

No.

Eff

Dscont

Nome

&

Description

Mfr

Code

Mfr Part

Num

R237*

315-0103-00 RES

.

,FXD,CMPSN:10K OHM,5»,0.25W

01121

CB1035

R240*

315-0104-00

RES.,FXD,CMPSN:100K

0HM,5t,0.25W

01121

CB1045

R2431

315-0104-00 RES

.

,FXD

,CMPSN

:

100K OHM,5t,0.25W 01121 CB1045

R245*

315-0104-00 RES.

,FXD,CMPSN:100K OHM,5t,0.25W 01121 CB1045

R247

1

321-0117-00

RES. , FXD,FILM: 162 OHM, 1* ,0 .

125W 75042 CEAT0-1620F

R250

1

315-0103-00

RES.,FXD,CMPSN : 10K OHM,5t,0.25W

01121 CB103S

R251*

321-0222-00 RES

.

,FXD,FILM:2K OHM.lt

,0. 12SW

75042 CEATO-2001F

R255

1

321-0365-02 RES.

,FXD,FIIM:61.9K OHM,0.5*,0.125W

91637 MFF1816D61901D

R257

1

322-0643-01

R£S.,FXD,FIIM:600K OHM,0.5t,0.25W

75042 CEBT0-6003D

R260

1

315-0104-00

R£S.,FXD,CMPSN:100K

OHM,5t,0.25W 01121 CB1045

R265

1

315-0683-00 RES.

,FXD,CMPSN:68K OHM,5t,0.25W

01121 CB6835

R267

1

321-0106-00 RES.,FXD,FILM: 124

OHM,lt,0.125W 75042

CEAT0-1240F

R268

1

311-1731-00 RES.

,VAR,NONWIR:TRMR,20 OHM.0.5W

73138 91A20R00M

R269

1

321-0182-00 RES. ,FXD,FILM:768

OHM,lt,0.125W

75042 CEATO-7680F

R270

1

311-1222-00

RES

.

,VAR, NONWIR : 100

OHM,20t,0.50W 80294 3386F-T04-500

R271

1

321-0176-00 RES. , FXD,

FILM: 665

0HM,lt,0.125W 75042 CEAT0-6650F

R275

1

321-0446-00 RES

.

,FXD

.FILM :4

32K

OHM,lt,0.125W

75042 CEAT0-4323F

R277

1

321-0397-00 RES.,FXD,

FILM :133K

OHM,lt,0.12SW 75042 CEATO-1333F

R279

1

321-0219-00 RES. ,FXD,FIIM:1.87K

OHM,lt,0.12SW

75042 CEAT0-1871F

R280

1

311-1564-00

RES. ,VAR,NONWIR:500

OHM,20t,0.50W 73138 91A-500R0M

R282

1

321-0423-00 RES

.

,FXD ,FILM:249K

0HM,lt,0.125W 75042 CEAT0-2493F

R285

1

321-0380-00 RES.

,FXD,FILM:88.7K OHM, It ,0.

125W 75042 CEAT0-8872F

R290

303-0105-00 RES.

,FXD,CMPSN:1M OHM,5t,lW

01121 GB1055

R291

315-0104-00

RES

.

,FXD ,CMPSN : 100K

OHM,5t,0.25W 01121 CB1045

R293

321-0978-01 RES. ,FXD,FILM:11.02K

OHM,0.5t,0.125W

91637 MFF1816G11021D

R295

311-1565-00 RES. , VAR,

NONWIR:

250

OHM,20t,0.50W

73138 91A250R0M

R297

321-0385-00 RES.,FXD,FILM :100K OHM

,lt

,0.

125W

75042 CEAT0-1003F

R300

315-0184-00 RES

.

,FXD ,CMPSN: 18OK OHM. ,5t ,0.

25W 01121 CB1845

R302

315-0104-00

RES. ,FXD,CMPSN:100K

OHM,5t,0.25W 01121 CB1045

R304

321-0369-00 RES.

,FXD,FILM:68.1K OHM,lt,0.125W

75042 CEAT0-6812F

R305

311-1228-00 RES.

,VAR,NONWIR:10K OHM,20t,0.50W 80294

3389F-P31-103

R310

321-0184-00 RES. ,FXD,FIIM:806

OHM,lt,0.125W 75042 CEATO-8060F

R315

315-0393-00 RES

.

,

FXD

,CMPSN : 39K OHM,5t,0.25W

01121 CB3935

R325

315-0200-00 RES. ,FXD,CMPSN:20

OHM,5t,0.25W

01121 CB2005

R328

311-1559-00 RES. , VAR,NONWIR :10K OHM ,20t

,0.50W

73138

91A-10001M

R329

321-0255-00 RES. , FXD, FILM :4.42K OHM , It ,0.

125W 75042

CEATO-4421F

R330

321-0306-00 RES. , FXD,FILM:15K

OHM, It,0. 125W

75042 CEAT0-1502F

R334

315-0103-00 RES.

,FXD,CMPSN:10K

OHM,5t,0.25W 01121 CB1035

R340

301-0201-00 RES

.

,FXD ,CMPSN:200

OHM,5t,0.50W 01121 EB2015

R341

301-0201-00 RES.

,FXD,CMPSN:200 OHM, St, 0.

SOW 01121 EB2015

R342

301-0201-00

RES. ,FXD,CMPSN:200 OHM, St,0.

SOW 01121 EB2015

R343

301-0201-00

RES

.

, FXD ,CMPSN : 200

OHM,5t,0.50W 01121 EB2015

R344

301-0201-00 RES

.

,FXD ,CMPSN : 200 OHM,5t,0.50W

01121 EB2015

R345

301-0201-00 RES. ,FXD,CMPSN:200

OHM,5t,O.SOW 01121 EB2015

R346

301-0201-00 RES

.

, FXE

,CMPSN:

200

OHM,5t,0.50W

01121 EB2015

R349

315-0152-00 RES

.

,FXD,CMPSN

: 1

. 5K OHM,5t,0.25W 01121

CB1525

R350

315-0152-00 RES

.

,FXD,CMPSN :1.5K

OHM,5t,0.25W 01121 CB1525

R354

315-0152-00 RES. ,FXD,CMPSN:1.5K

OHM,5t,0.25W

01121 CB1525

R355

315-0152-00

RES. ,FXD,CMPSN:1.5K

OHM,5t,0.2SW 01121 CB1525

R359

315-0152-00 RES. ,FXD,CMPSN:1.5K

0HM,5t,0.25W 01121

CB1525

R360

315-0152-00 RES.,FXD,CMPSN:1.5K

OHM,5t,0.25W 01121 CB1525

R364

315-0152-00 RES

.

,FXD ,CMPSN: 1.5K

OHM,5t,0.25W 01121 CB1525

R365

315-0152-00 RES

.

,FXD,CMPSN: 1.5K

OHM,5t,0.25W 01121 CB1525

*

Remove for Option 2.

3-6

REV

. C

FEB.

1975

Electrical

Parts List—

DM 502

Ckt No.

Tektronix

Port

No.

Serial/Model

No.

Eff

Dscont

Name &

Description

Mfr

Code Mfr

Part

Number

R369

315-0472-00

RES.,FXD,CMPSN:4.7K

OHM,5%,0.25W 01121

CB4725

R370

315-0201-00

RES. , FXD,

CMPSN:

200

OHM,5*,0.25W

01121 CB2015

R372

315-0201-00

RES., FXD, CMPSN: 2 00

OHM,5*,0.25W

01121 CB2015

R374

315-0103-00 RES.,

FXD,CMPSN :10K

OHM,5%,0.25W 01121 CB1035

R375

315-0103-00

R£S.,FXD,CMPSN:10K

OHM,5%,0.25W

01121 CB1035

R377

315-0201-00

RES

.

, FXD , CMPSN : 2 00

OHM,S*,0.25W 01121

CB2015

R380

315-0103-00 RES.

,FXD,CMPSN:10K

OHM,5%,0.25W 01121 CB1035

R382

315-0201-00 RES.,

FXD,CMPSN:200

OHM,S%,0.25W 01121

CB2015

R383

315-0201-00 RES.

,

FXD,

CMPSN; 200

OHM,5»,0.2SW 01121

CB2015

R400

301-0681-00

RES. , FXD,CMPSN: 680

OHM,5»,0.50W

01121 EB6815

R405

301-0681-00

RES.,FXD,CMPSN:680 OHM, 5*,0.

SOW 01121

EB6815

R415

321-0371-00

RES.,FXD,FILM:71.5K

OHM,1*,0.125W

75042 CEAT0-7152F

R418

304-0681-00

RES

.

,FXD ,CMPSN:680 OHM,

104, 1W

01121 GB6811

R422

321-0335-00 RES.

,FXD,FIUS:30.1K

OKM,1%,0.125W 75042

CEAT0-3012F

R427

303-0511-00

RES.,FXD,CMPSN: 510

0HM,5*,1W 01121

GB5115

R437

304-0181-00 RES.,

FXD .CMPSN: 180 OHM, 104,

1W 01121 GB1811

R440

307-0106-00

RES.,FXD,CMPSN:

4.

7

OHM,5*,0.25K

01121 CB47G5

R450

315-0621-00

RES. ,FXD,CMPSN:620

OHM,5%,0.25W

01121 CB6215

R452

315-0622-00

RES. , FXD

.CMPSN

: 6.

2K

OHM,5*,0.25W 01121 CB6225

R453

315-0562-00 RES.

,FXD,CMPSN:5.6K

OHM.54.0.25W

01121 CB5625

RT100

150-0131-00

LAMP,INCAND:0.025A 120V

71744 120PS

RT220

307-0472-00

RES., THERMAL :100K

5*,NTC DISC

15454

10E104-JS

S100

260-1208-00 SWITCH, PUSH

:DPDT

71590 2KAB010000-359

S110

263-1106-00 ACTR,ASSY,

CAM SW:TIME/C M

80009

263-1106-00

S200

260-1332-00

SWITCH,

PUSH:

80009

260-1332-00

T410

120-0958-00

XFMR , PWR : SDN

80009

120-0958-00

0120

156-0197-00

MICROCIRCUIT, LI: 5

TRANSISTOR ARRAY

86684 CA3086

0135

156-0512-00

MICROCIRCUIT, LI OPERATION

AMPLIFIER

27014 LM308N

0195

156-0511-00

MICROCIRCUIT, LI

OPERATIONAL AMPLIFIER

18324 NE531V

0210

156-0067-00

MICROCIRCUIT, LI OPERATIONAL

AMPLIFIER

80009

156-0067-00

0220

156-0512-00 MICROCIRCUIT,LI

OPERATION AMPLIFIER

27014 LM308N

0250

156-0158-00 MICROCIRCUIT,

LI: DUAL OPERATIONAL

AMPLIFIER

18324 S5558V

0290

156-0477-00

MICROCIRCUIT, LI :ANAL SECT

OF A/D SYS

.

,M0S

17856 LD111

0325

156-0402-00

MICROCIRCUIT ,DI : TIMER

18324 NE555V

0335

156-0476-00 MICROCIRCUIT, LI

:DIGTL SECT OF A/D

SYS.,MCS 17856 LD110

0340

156-0128-00 MICROCIRCUIT,

DI.-SGL BCD TO

7-SEG DCDR/DRVR

01295 SN7447AN

0345

156-0093-00

MICROCIRCUIT,DI : HEX .

INVERTER

01295 SN7416N

0420

156-0496-00

MICROCIRCUIT, LI

:VOLT REG. DUAL

TRACKING

49956 RC4194D

VR120

152-0317-00

SEMICOND

DEVICE:ZENER,0.25W,6.2V,54

81483 1N3497

VR270

1

152-0317-00

SEMICOND DEVICE :

ZENER, 0. 2 5W, 6. 2V

,5% 81483 1N3497

VR300

152-0306-01 SEMICOND DEV ICE : ZENER, 0 . 4W , 9 . IV

, 5 4

04713 1N960B

VR310

152-0317-00

SEMICOND DEVICE : ZENER,

0.2SW,

6

.2V ,5%

81483 1N3497

VR400

152-0243-00

SEMICOND DEVICE : ZENER, 0

,4W, 15V ,5%

81483 1N965B

VR405

152-0243-00

SEMICOND DEVICE:ZENER,0.4W,15V,5%

81483 1N965B

1

Remove for Option 2.

REV. C FEB. 1975

3-7

Section

3-DM

502

SERVICE

INFORMATION

SYMBOLS

AND

REFERENCE

DESIGNATORS

Electrical

components

shown

on

the diagrams are in the following

units unless noted otherwise:

Capacitors

=

Values one or greater are in picofarads

<

pF

)

.

Values less than one are in microfarads (pF).

Resistors

=

Ohms (fl)

Symbols used

on the diagrams are based on

ANSI Y32.2

—

1970.

Logic symbology

is based on Ml L-STD-806B

in terms of positive logic. Logic symbols

depict

the

logic

function

performed

and may

differ from the

manufacturer's

data.

The

following special symbols

are

used

on the diagrams:

External Screwdriver adjustment.

External control

or connector.

Clockwise control rotation in

direction of arrow.

Refer to

diagram number indicated in diamond.

Refer to

waveform number indicated in hexagon.

Connection

soldered

to

circuit board.

Connection made to circuit

board with interconnecting pin.

Blue

tint encloses components

located on circuit board.

P/O circuit

board

3-1

Service Available

Tektronix, Inc., provides

complete instrument repair

and adjustment at local Field Service

Centers and

at

the

Factory Service Center. Contact your local

Tektronix Field

Office or Representative for

further information.

Refer to the

TM

500

Series Power Module manuals for

complete maintenance information.

Test Equipment

For calibration and a

complete accuracy check of the

DM

502,

the following equipment is

required:

Digital counter

capable of reading to 25 kHz, Tektronix

DC

504 or equivalent.

Dc voltmeter to 20

V, Tektronix DM 501, DM 502 or

equivalent.

Dc voltage source to 1 kV.

Dc current source to 2

A.

Ac voltage source to 500 Vrms, 40

Hz, 1 kHz and 10kHz.

Ac current source to

2

A rms, 1 kHz.

Resistances to 20

MO.

Temperature

source, about 0°C and 100°C.

Accuracy of calibration and

performance checks de-

pend upon the

accuracy of the test equipment used.

Preparation

The DM

502 can be

calibrated

either fully installed in a

TM

500 series power module, or connected to the

power

module via a flexible plug-in

extender (Tektronix Part

Number

067-0645-01

). Remove the power module cabinet

to make adjustments to the DM

502 inside the power

module. DM 502 adjustments are located on the

compo-

nent side of the board. Remove the right side plug-in cover

for access

to

the calibration

adjustments. See the accom-

panying illustration for adjustment

locations. Make ad-

justments at an ambient temperature between

+20°

C

and

+30°

C

(+68°

F to

+86°

F). Allow

20 minutes warmup time.

Recommended recalibration interval is every six months.

Sometimes overall accuracy of

the DM 502, on ranges

affected

by a specific

adjustment,

may be improved by

compromising the adjusment,

within specifications, from

the exact setting

called for in this procedure.

Checks and Adjustments

-1.

Check

Power Supply Voltages. Using the

dc

voltmeter at the points

shown

on

the illustration, check the

power supplies for +5 V, ±0.1 V, and ±12 V, ±0.6 V.

2. Adjust Clock Frequency. Connect the

counter input

to the point labeled clock in the accompanying illustra-

tion. Adjust R328, Clock, for a

frequency of 20.48 kHz ±0.2

kHz.

3.

Adjust Integrator Zero.

Set

the range-function

switch at the 2 DC VOLTS position.

Short the HI and

LO

input binding posts together. Adjust C315,

A-D

Zero,

fora

display reading of all zeros ± one count.

4. Adjust DC Calibration. Apply a known dc voltage

near 1 .9 V to the HI

and LO binding posts

(+

to the HI post).

Make certain the

range-function switch is in the 2 DC

VOLTS position. Adjust R305, 2 VDc, for a display reading

of the applied voltage ± one count.

Change the applied

voltage to about

0.19 V and the range-function switch to

the 200 MV position. Adjust R295, .2 V Dc, to

display

the

applied voltage ± one count.

5. Check DC

Voltage Ranges. Apply known

voltages,

approximately 5% below each

full

scale

value on the

range-function switch to

the HI and LO binding posts.

Check that

all ranges are within

specifications.

DM 502

6. Adjust Temperature

Offset. Place the range-

function switch in the

TEMP

0

C position. Connect a

P6430

probe to the front panel connector labeled TEMP

PROBE.

Place the probe

tip

in a known environment (about 0°C

and

adjust R270, Offset Adj, for a display readout

of the

probe tip

temperature

±

one count.

7.

Adjust Temperature Gain. Without changing the

settings from the previous step, place the probe tip in a

known

environment (about 100°C).

Now adjust R280,

Gain, for a display reading of the probe tip

temperature

±

one

count. Redo

step 6

and this step until no interaction

exists.

8. Adjust °F

Calibration. With the probe tip at a

temperature of (or

near)

0°

C

change the range-function to

the °F position. Adjust R268, °F, for a

display

reading

of

32°

F ±

one count. (If the probe tip is not exactly at 0°C,

convert the actual temperature in

centigrade

to

Fahrenheit

using:

9. Adjust Ohms Calibration. Set the range-function

switch

to

the 200 K OHMS position. Connect a resistance

of

known

accuracy

near

190 kQ to the HI

and LO binding

posts. Adjust R130, Ohms, for a display readout of the

known resistance

±

one

count.

10. Check Resistance Ranges. Connect resistances of

known

accuracy,

approximately

5%

below full scale values

as shown on the range-function switch, to the HI and LO

binding posts. Check that all OHMS ranges are

within

specified accuracy.

11. Check DC mA Ranges. Apply accurately known

dc

currents, approximately

5%,

below full scale values

as

shown on the range-function switch,

to

the HI

and LO

binding posts. Check that all

DC

mA positions

are within

specifications.

12.

Adjust AC

Voltage Calibration. Set the range-

function switch to the 2 AC VOLTS position. Connect

an

accurately known ac voltage

near

1 .9 volts

rms at 1 kHz

to

the HI

and LO binding posts. Adjust R180, 2 V Ac,

for

a

display reading of

the

applied voltage

± one

count. Now

switch the range-function switch to the 200 MV AC VOLTS

position and apply an accurately known voltage

near 190

mV

to the input terminals. Adjust R175, .2 V Ac, for a

display reading of the applied voltage ± one count.

13.

Adjust 20 V AC Compensation. Set the range-

function

switch

to

the 20 AC VOLTS position.

Connect

a

known ac voltage

near 19 volts rms

at a

frequency of 1 kHz

to

the HI and LO binding posts. Adjust C150, 20

V Ac

Comp, for a

display reading of the applied voltage

+

one

count.

Now switch to the 200 AC VOLTS

position and

apply an accurately known ac voltage near 190

volts rms.

Check

that the

display reading is the applied

voltage

within specifications. If not, redo this step,

slightly com-

promising the

adjustment in the 20 AC VOLTS

position,

until both readings are within

specifications.

14.

Adjust 500 V AC Gain and

Compensation. Set the

range-function switch to

the 500 AC VOLTS position.

Connect an accurately known ac voltage

near

500

V ac rms

at

100 Hz to the HI and LO

binding

posts.

Adjust R

155,

500

V Ac Gain, for a

display reading of the applied

voltage

±

one count. Now change the

frequency

of

the applied

voltage to 10

kHz and adjust

C155,

500 V Ac Comp,

for

a

display reading of the

applied

voltage

± one count. These

adjustments

interact. Redo both as required for

accurate

calibration.

15.

Adjust dB Zero and

—20

dB. Make

certain the

jumper is in the dBm

position.

Set

the range-function

switch to the 2 AC

VOLTS position and push the dB

pushbutton. Apply 0.07746V ac

rms

at

1 kHz to the HI and

LO

binding posts. Adjust R205, dB

Zero, for a display

reading of all zeros ± three

counts. Now apply 0.00869 V

ac

rms

at

1 kHz and adjust R215,

—20

dB, for

a

display

reading of

—19.00

±

three counts. Apply 0.69036 V ac

rms

at 1

kHz and check for a

display reading of +19.00, within

specification limits by at

least ten counts. Now

switch the

jumper to the

dBV position, apply

1

.0000 V ac

rms

at

1 kHz

and check for a display

reading of all zeros within

specification limits by at least ten counts.

16. Check

All

AC mA

Ranges. Apply an accurately

known

ac

current at

a

frequency of 1 kHz, with an

amplitude of approximately 5% below full

scale values

as

shown

on the

range-function switch,

to

the HI and LO

binding

posts

Check each

AC mA

position for accuracy

within specifications.

DM

502

REAR

INTERFACE CONNECTOR

ASSIGNMENTS

Rear-view

ol

plug-in

'These outputs must

be buffered before using them to drive external inputs. See text for suitable

buffering

circuit.

'Used In

the DM

502.

Only the

Temp

Out.

Temp Gnd. and HI and

LO

inputs are factory wired. The

others

must be

installed

by the user See

accompanying illustration for jumper locations tor connections.

BCD

outputs are serialized by digits in an

8-4-2-1

code.

This

code is not

valid when

the MSD

line is

high. When the

MSD

and the one are high the fourth significant digit is a one. A two

may

also be

encoded as

well

as

overrange information.

BLOCK

DIAGRAM

raise the anodes

to the un-

regulated

driver voltage, the

modules are lighted. The

most

significant digit module

displays

the polarity sign as

well as the

numeral one.

DM 502

CONTROLS

AND

CONNECTORS

A00

TO

DISPLAY

„

IN

dB MODE

DC

VOLTS

\

-20

AC

VOLTS

TEMP

OHMS

TEKTRONIX

©

DM

502

DIGITAL

MULTI METER

TEMP

PROBE Connector

Display

Readout

3

1/2

digit LED readout

with

decimal

point positioned by

range

function

switch.

Resolu-

tion

is 0.05% of

range

except

temperature which is

0.1“.

INPUT

Binding Posts

Binding

posts for application of

unknown voltage,

current or

resistance. May be floated 1

kV

above ground.

Ground

Binding Post

Chassis Ground

ao

as.

itiHIMu luwpi*

Range Function

Switch

Selects all ranges and functions.

dB

Button in selects dB

readout in

ac modes.

INPUT

Pushbutton

Button

OUT transfers input

to

front panel.

Button in rear inter-

face connector.

Does not switch

TEMP input.

Mates

with P6430 probe

con-

nector. Also used

with other

temperature sensing

devices.

CKT GRID CKT GRID

NO LOC

NO LOC

DM 502

EGV.

B

,

MOV

.

1914

ATTENUATORS

f

CONVERSION

CIRCUITS<j>

NS

8

-

12.-

74

I

!!

ill

I

!

I

(I

[BDBBBBBl

tanicannoH

gaBDBDBBang]
liiaBCBBonil

{I

iBBnBrBBHCBl

iBannaBnaii

IIbCIBGBBGGGI

HinUBH

SiflIIGBIBBi

ipiniflM

|BDBBl

iejbiL

I

lBBGBBBBBBfll

iBBGflflflflBBBl

Mnaanai

g

caBaaiBaBi

IbBBGBIBBBI
|HBBGBIBIBI
Ibbbgbibbbi

I

Mugbbbbbi

IbDBGBBBBBI

MDIGMIBII

InnBCBIBBBBI

I

BBIGGBIGBI

IggBGBBBBBI

BDIGBHBBI

Ibgbgbbbbbi

Imggbbibbi

I

Ibbbggbogbi
Ibbbggbggbi
Ibbbggbgbbi
Ibbbggbgbbi

IIIGGinBGI

Ibbbggbgbbi
[BBBGBGBBBI

igbbgg^^H

|GBBGGBBBB|

iGBBGGBBGBl

bbbbggbbmbJ
IBBBGGBBGBI

IBBBGGBBGBI

pHnnBiafl

liiiGGBBGB
IBBBDCBBCB

IGBBGGBBGB

Egigbiibib

Igbbgbbbbbb
Igbbgbbbbbb

pBBGIIIBH

IgBBGBBBBBH

IGBGGBBGGBB
IgBGGBBGGBB

HBGGBBGGBB
pBGGBBGGBB
[BGGBBGBiU
(BGGBBGBBB

a

HBGBBBBflB

GBIIIIfl

I

IBGflBflflBGBBH

Ibubbbgbgbbll

Ibgbbgbbgbbh

bgbobbbgbb

IbqbbbgbgbbI

buaaaiBG^

bbigidH

iBGBflGBBGBB^

Ibgbgbbbgbb
Ibgbbbgbgbb

I

iaGaflBGaBBB

IgGGJBBGBBB

BGBGBBB

BBGGBBB

BBGBBB

I

GBBBBGGBBB

Ibbbgbbgbbb

IlIBBGIGIIB

Ibbbbbggbbb
Ibbbgbbgbbb
Ibbbbgbgbbb

IBOGBBGGBGG

gOO

MV-

40

K

Section

5—DM 502

REPLACEABLE

MECHANICAL PARTS

PARTS ORDERING INFORMATION

Replacement parts are

available from or through your local

Tektronix, Inc Field Office

or representative.

Changes to Tektronix

Instruments are sometimes made to

accommodate improved

components

as

they become available,

and

to

give

you

the benefit of the latest

circuit improvements

developed in

our engineering department. It

is therefore

important, when ordering parts, to

include the following

information in your order: Part

number, instrument type or

number, serial number,

and modification number if applicable.

If

a

part

you

have ordered has been

replaced with

a

new or

improved part, your local

Tektronix, Inc. Field Office

or

representative

will contact

you

concerning any change in

part

number.

Change information,

if any, is located at the rear

of this

manual.

SPECIAL NOTES AND

SYMBOLS

X000 Part first added at

this serial number

00X

Part removed after

this serial number

FIGURE AND

INDEX NUMBERS

Items in

this section are

referenced

by

figure and index

numbers

to

the

illustrations.

INDENTATION SYSTEM

This mechanical parts list

is indented to indicate item

relationships Following is an example of the indentation system

used in the description column.

1 2 3 4 5 Name & Description

Assembly and/or Component

Attaching parts lor Assembly and/or Component

Detail

Part

ol Assembly and/or

Component

Attaching

parts tor

Detail Part

Parts ol Detail Part

Attaching parts lor Parts

ol Detail Part

Attaching Parts always appear in the same indentation

as

the item it mounts, while the detail parts are indented to the right.

Indented items

are

part of.

and

included with, the next higher

indentation.

The

separation symbol

—

*

—

indicates the end of

attaching parts

Attaching parts must be purchased separately, unless otherwise

specified.

ITEM NAME

In the Parts

List, an Item Name

is

separated from the

description

by a colon (:). Because

of

space

limitations, an Item

Name may sometimes appear as incomplete. For further Item

Name

identification, the

U.S.

Federal Cataloging Handbook H6-1

can

be

utilized where possible.

ABBREVIATIONS

-

INCH ELCTRN ELECTRON

IN

INCH

SE

SINGLE END

• NUMBER SIZE

ELEC

ELECTRICAL

INCAND

INCANDESCENT SECT SECTION

ACTH

ACTUATOR

ELCTLT ELECTROLYTIC

INSUL

INSULATOR SEMICOND SEMICONDUCTOR

ADPTR

ADAPTER

ELEM

ELEMENT INTL

INTERNAL SHLD SHIELO

ALIGN

ALIGNMENT

EPL

ELECTRICAL PARTS LIST LPHLDR

LAMPHOLDER SHLDR SHOULDERED

AL

ALUMINUM

EOPT

EOUIPMENT MACH

MACHINE SKT SOCKET

ASSEM

ASSEMBLED

EXT EXTERNAL

MECH

MECHANICAL SL

SLIDE

ASSY

ASSEMBLY

FIL FILLISTER HEAD

MTG

MOUNTING

SLFLKG SELF-LOCKING

ATTEN

ATTENUATOR

FLEX

FLEXIBLE

NIP

NIPPLE

SLVG SLEEVING

AWG AMERICAN WIRE

GAGE

FLH

FLAT HEAD

NON WIRE

NOT WIRE

WOUND

SPR SPRING

BO

BOARD

FLTR

FILTER

060

ORDER BY

DESCRIPTION

SO

SOUARE

BRKT BRACKET

FR

FRAME Or FRONT

00

OUTSIDE

DIAMETER SST

STAINLESS STEEL

BRS BRASS

FSTNR

FASTENER

OVH

OVAL

HEAD STL STEEL

BRZ BRONZE FT FOOT

PH BRZ

PHOSPHOR

BRONZE

SW

SWITCH

BSHG

BUSHING

FXD

FIXED

PL

PLAIN

or PLATE

T

TUBE

CAB CABINET GSKT GASKET

PLSTC

PLASTIC TERM TERMINAL

CAP

CAPACITOR

HOL HANDLE

PN

PART NUMBER THD THREAD

CER CERAMIC

HEX

HEXAGON

PNH

PAN HEAD THK THICK

CHAS CHASSIS HEX HD HEXAGONAL

HEAD

PWR POWER TNSN TENSION

CKT

CIRCUIT

HEX

SOC

HEXAGONAL SOCKET

RCPT

RECEPTACLE

TPG

TAPPING

COMP COMPOSITION

HLCPS

HELICAL COMPRESSION

RES

RESISTOR

TRH

TRUSS HEAD

CONN

CONNECTOR HLEXT HELICAL EXTENSION

RGO

RIGID

V

VOLTAGE

COV

COVER

HV

HIGH VOLTAGE

RLF

RELIEF

VAR

VARIABLE

CPLG

COUPLING

1C

INTEGRATED

CIRCUIT

RTNR

RETAINER

Wt

WITH

CRT

CATHODE RAY TUBE ID INSIDE DIAMETER

SCH

SOCKET

HEAD

WSHR WASHER

DEG

DEGREE IDENT

IDENTIFICATION

SCOPE

OSCILLOSCOPE XFMR TRANSFORMER

DWR

DRAWER

IMPLR

IMPELLER

SCR

SCREW XSTR TRANSISTOR

5-1

Mechanical

Part*

Llat—DM

502

CROSS INDEX

MFR.

CODE NUMBER TO MANUFACTURER

MFR.CODE MANUFACTURER ADDRESS CITY.STATE

t

ZIP

0000A LEMO

USA

2015

2ND ST.

OOOOC GETTIG

ENGINEERING AND MANUFACTURING CO.

00779 AMP, INC.

P. 0. BOX 3608

01295

TEXAS INSTRUMENTS, INC.,

SEMICONDUCTOR GROUP P. 0. BOX 5012

05820

WAKEFIELD

ENGINEERING, INC. AUDUBON ROAD

08261

SPECTRA-STRIP CORP. 7100 LAMPSON AVE.

22526 BERG

ELECTRONICS, INC. YOUK

EXPRESSWAY

23499 GAVITT WIRE

AND CABLE, DIVISION OF

RSC

INDUSTRIES, INC. 455 N. QUINCE ST.

45722 USM CORP.,

PARKER-KALON FASTENER DIV. 1 PEEKAY DRIVE

58474 SUPERIOR ELECTRIC CO.

,

THE 383 MIDDLE ST.

71590 CENTRALAB ELECTRONICS,

DIV.

OF

GLOBE-UNION

,

INC. 5757 N. GREEN BAY AVE

73743 FISCHER SPECIAL MFG. CO. 446

MORGAN

ST.

74445 HOLO-KROME

CO.

31 BROOK ST.

WEST

77250

PHEOLL MANUFACTURING CO.,

DIVISION

OF ALLIED PRODUCTS

CORP. 5700 W. ROOSEVELT RD.

78189 ILLINOIS TOOL

WORKS,

INC.

SHAKEPROOF DIVISION ST.

CHARLES ROAD

80009 TEKTRONIX, INC. P. O. BOX 500

82647 TEXAS INSTRUMENTS,

INC.,

CONTROL PRODUCTS

DIV. 34 FOREST ST.

83385 CENTRAL

SCREW

CO.

2530 CRESCENT DR.

97464 INDUSTRIAL RETAINING RING CO. 57 CORD IER

ST.

BERKLEY,CA94710

SPRINGMILL, PA 16875
HARRISBURG, PA 17105

DALLAS, TX 75222

WAKEFIELD,

MA 01880

GARDEN GROVE,

CA 92642

NEW CUMBERLAND, PA 17070

ESCONDIDO, CA 92025
CLIFTON, NJ

07014

BRISTOL, CT 06010

MILWAUKEE, WI

53201

CINCINNATI, OH 45206
HARTFORD, CT 06110

CHICAGO,

IL 60650

ELGIN, IL 60120

BEAVERTON, OR 97077

ATTLEBORO, MA

02703

BROADVIEW,IL60153

IRVINGTON, NJ 07111

Mechanical Parts List—DM

502

Fig.

&

Index

No.

Tektronix Seriol/Model No.

Port No.

Eff Dscont

Qty

12345

Name

& Description

Mfr

Code

Mfr Part Number

-1

337-1399-02

1 SKLD, ELECTRICAL:SIDE

WITH

INSULATOR 00009

337-1399-02

-2 337-1399-00

1

SHLD .ELECTRICAL :SIDE

80009

337-1399-00

-3

366-1606-00 1 KNOB :GRY,DSPL, 0.125 ID, 1.5

OD.0.75H 80009

366-1606-00

213-0153-00 2 .

SETSCREW

:

5—40

X

0.125 INCH, HEX SOC STL

74445 OBD

348-0031-00 XB010750 1 GROMMET, PLASTIC! 0.156 INCH DIA

80009

348-0031-00

-4

366-1402-27

1

PUSHBUTTON

:

"INT" 80009

366-1402-27

366-1557-19 1 PUSHBUTTON

:

"DB”

80009

366-1557-19

-5

366-1422-01 1

KNOB: LATCH 80009

366-1422-01

(ATTACHING PARTS)

-6 214-1840-00

1

PIN, KNOB SECRG: 80009

214-1840-00

-7 129-0064-02

1

— — — — — —

POST, BDG, ELEC : WHITE,

5-WAY

.MINIATURE

58474 DF21WTC

(ATTACHING

PARTS)

-0

210-0457-00 1 NUT, PLAIN, EXT

W:6-32

X

0.312 INCH, STL 83385 OBD

-9 210-0202-00

1

TERMINAL,

LUG

:SE #6

78189 2104-06-00-2520N

-10 129-0064-00 1

_ —

— _

POST, BDG,ELEC:

CHARCOAL, 5-WAY MINIATURE

58474

BINP BB10167G13T

(ATTACHING

PARTS)

-11

210-0457-00 1 NUT, PLAIN, EXT W:6-32 X 0.312

INCH,

STL

83385 OBD

-12 358-0181-00 1 INSULATOR ,BSHG : CHARCOAL

58474 BB10166G13BX

-13 129-0064-01 1

_ — — — _

POST, BDG, ELEC: RED,

5-WAY MINIATURE 58474 BB10167G2BX

(ATTACHING

PARTS)

-14

210-0457-00

1

NUT,

PLAIN,EXT

W:6-32

X

0.312 INCH, STL 83385 OBD

-15 358-0101-01 1 INSULATOR , BSHG : RED

58474 BB1066G2

-16 131-1652-00

1

CON, RCPT, ELEC :1 FEM.l MALE CONTACT OOOOA RA0302

(ATTACHING PARTS)

210-0255-00

1

TERMINAL,LUG:

0.391"

ID INT TOOTH 80009

210-0255-00

-17

426-0681-00 2

FR ,

PUSH BUTTON:

GRAY PLASTIC 80009

426-0681-00

-18 333-1976-00

1

PANEL, FRONT: 80009

333-1976-00

333-1976-01

1

PANEL, FRONT rOPTION 2 80009

333-1976-01

(ATTACHING

PARTS)

-19 210-0405-00

2

NUT, PLAIN, HEX. : 2-56

X

0.188 INCH.BRS

73743

2X12157-402

-20 210-0259-00 1 TERMINAL,LUG:

0.099

"ID INT TOOTH, SE 80009

210-0259-00

-21 210-0001-00

1

WASHER, L0CK:INTL, 0.092 ID X 0.18"OD,STL

78189

1202-00-00-0541C

-22 211-0034-00

2

SCREW,MACHINE:2-56 X 0.S00

INCH, PNH,

STL

77250 OBD

-23

331-0314-00 1 WINDOUT

,

READOUT

:

80009

331-0314-00

-24 426-0916-00 1 FRAME, RDOUT

WDO: 80009

426-0916-00

-25

386-3149-00

1

SUBPANEL

,

FRONT

:

PLASTIC 80009

386-3149-00

(ATTACHING PARTS)

-26 213-0227-00

2

SCR , TPG,THD FOR:6-32 X 0.50 100 DEG.FLH ST

OBD

-27 213-0229-00 2 SCR,TPG,THD FOR:6-20 X0.375"100

DEG.FLH STL 83385 OBD

-28 214-1513-01

1

LCH.PLUG-IN RET:

80009

214-1513-01

(ATTACHING PARTS)

-29 213-0254-00 1 SCR,

TPG,

THD CTG:2-56X0.25"100

DEG.FLH STL

— — —®— — _

45722 OBD

-30 337-2130-00 1 SHIELD, ELEC

:SUBPL REAR 80009

337-2130-00

-31 1

CKT BOARD ASSY :DISPLAY (SEE A2 EPL)

-32

131-0608-00 17

.

CONTACT, ELEC :0. 365 INCH LONG 22526

47357

-33 384-1129-00 1 EXTENSION SHAFT: 5.

607 INCH LONG 80009

384-1129-00

672-0478-00

1

CKT BOARD ASSY:W/CAM SW 80009

672-0478-00

672-0479-00

1

CKT BOARD ASSY:W/CAM SW 80009

672-0479-00

(ATTACHING

PARTS)

-34 213-0146-00

4 SCR, TPG,

THD

FOR:6-20 X

0.313 INCH, PNH STL

— —•• • ••

83385 OBD

263-1106-00

1 . ACTR,ASSY,

CAM S:W/TIME/CM 80009

263-1106-00

(ATTACHING

PARTS)

-35 211-0116-00 8

.

SCR.ASSEM

WSHR:4-40

X 0.312

INCH, PNH BRS 83385 OBD

REV. B

JAN.

1975

5-3

Mechanical

Parts

List—

DM 502

Fig.

&

Index

No.

Tektronix

Seriol/Model No.

Port No.

Eff Dscont

Qty

1

7

345

Name

&

Description

Mfr

Code

Mfr Port Number

-36 200-1743-00

1

”7

.

COVER,CAM SW:6. 200"DA, 10 32 ELEM

80009

200-1743-00

(ATTACHING PARTS)

-37 211-0000-00 0

.

SCREW,MACHINE:4-40 X 0.25

INCH,PNH STL 83385 OBD

-30 210-0004-00 0

.

WASHER, LOCK:INTL, 0.12 ID X 0.26"OD,STL

78189

1204-00-00-0

541C

-39 210-0406-00 4

.

NUT, PLAIN,HEX. :

4-40

X

0.100 INCH,BRS

73743

2X12161-402

-40 407-1199-00 1 .

BRACKET,COVER:

80009

407-1199-00

-41 376-0000-00 1

.

CPLG,

SHAFT,

RGD:

80009

376-0008-00

213-0005-00 2 . .

SETSCREW :

0-32

X

1.25 INCH,

HEX

SOC STL

74445 OBD

-42 210-0406-00 4

.

NUT, PLAIN, HEX.

:4-40

X

0.100 INCH.BRS

73743

2X12161-402

-43 214-1139-03 1

.

SPRING, FLAT: RED COLORED

80009

214-1139-03

214-1139-02 1

.

SPRING, FLAT: GREEN COLORED

80009

214-1139-02

-44 214-1127-00 2

.

ROLLER, DETENT: 0.125 DIA X 0.125

INCH

L

80009

214-1127-00

-45 401-0091-02

1 .

BEARING,CAM

SW:

FRONT

80009

401-0081-02

(ATTACHING PARTS)

-46 354-0391-00 1 .

RING, RETAINING: 0.395”FREE ID X

0.025”

STL

97464 3100-4 3-CD

-47 105-0642-00 1 .

ACTUATOR,

CAM

SW: TIME/CM, REAR 80009

105-0642-00

-40 210-0406-00 4

.

NUT, PLAIN, HEX.

:4-40

X

0.100 INCH.BRS

73743

2X12161-402

-49 401-0115-00 1

.

BEARING,

CAM

SW

:

CENTER 80009

401-0115-00

-50 210-0406-00 4 .

NUT,PLAIN,HEX.

:4-40

X 0.100 INCH.BRS

73743

2X12161-402

-51 214-1139-03 1 .

SPRING,FLAT:RED COLORED

80009

214-1139-03

214-1139-02 1

• .

SPRING,FLAT:GREEN

COLORED 80009

214-1139-02

-52 214-1127-00 2

• .

ROLLER,

DETENT:0.

125

DIA X 0.125 INCH L 80009

214-1127-00

-53 401-0001-02

1

• .

BEARING .CAM

SW:

FRONT

80009

401-0081-02

(ATTACHING PARTS)

-54 354-0391-00 1

.

RING ,

RETAINING

: 0

. 395"FR£E ID X

0.025"

STL

97464

3100-4

3-CD

-55 105-0641-00 1

.

ACTUATOR,CAM

SW:TIME/CM,FRONT 80009

105-0641-00

-56

—

1 CKT

BOARD ASSY :MAIN (SEE A1 EPL)

-57 131-0604-00

45 .

CONTACT, ELEC: 0.025 SQ X 0.365

INCH LONG 80009

131-0604-00

-50 131-0600-00 26

.

CONTACT,ELEC:0.365

INCH LONG 22526

47357

-59 1 .

TRANSFORMER: (SEE T410 EPL)

-60 407-1640-00

1 . .

BRACKET,

XFMR: 0.026

WD.2.375”

L,

1.701 H 80009

407-1640-00

(ATTACHING PARTS)

-61 211-0507-00 2 .

SCREW .MACHINE:

6-32

X 0.312

INCH.PNH STL 83385 OBD

-62 210-0457-00 2

.

NUT, PLAIN,

EXT

W:6-32

X

0.312 INCH, STL 83385 OBD

-63 260-1200-00 1

.

SWITCH , PUSH

:

DPDT

71590 2KAB01

0000-3

59

-64

361-0573-00

2 .

SPACER,SLEEVE:

80009

361-0573-00

-65 344-0154-00 4

.

CLIP .ELECTRICAL: FOR 0.25

INCH DIA FUSE

80009

344-0154-00

-66 136-0514-00 2

.

SOCKET, PLUG-IN

:MICROCIRCUIT,0 CONTACT

82647

C930802

-67 136-0269-02 3 .

SOCKET,PLUG-IN:14 CONTACT,

LOW CLEARANCE 01295 C931402

-60 136-0260-02 5

.

SOCKET,PLUG-IN:16 CONTACT,

LOW CLEARANCE 01295 C931602

-69 260-1332-00 1

.

SWITCH, PUSH:

80009

260-1332-00

-70 361-0305-00 2

.

SPACER, PB SW: 0.164 INCH LONG

80009

361-0385-00

131-0993-02 1 .

LINK , TERM .CONNE : 2 WIRE RED

00779

1-530153-0

131-0993-09 1 .

LINK, TERM.CONNE : 2

WIRE WHITE

00779 530153-1

-71 214-0579-00 2

.

TERM., TEST PT:0.40 INCH LONG

80009

214-0579-00

-72 131-0566-00

1 .

LINK,TERM.

CONNE: 0.086 DIA X 2.375 INCH L OOOOC L-2007-1

214-1291-00

1 .

HEAT SINK,

ELEC:XSTR, 0.72 OD X 0.37S"H

05820 207-AB

131-0993-02 “LINK,TERM.CONNE: 2 WIRE

RED

00779

1-530153-0

131-0993-09

1

“LINK, TERM.

CONNE:2 WIRE WHITE

00779

530153-1

-73 426-0724-04 1

FR SECT, PLUG-

IN:BOTTOM 80009

•

426-0724-04

-74 214-1061-00 1 SPRING

,

GROUND :

FLAT

80009

214-1061-00

-75 426-0725-05 1 FR SECT,PLUG-

IN: TOP

80009

426-0725-05

-76 352-0169-00 1 CONN

BODY,PL,EL:2 WIRE BLACK

80009

352-0169-00

-77 352-0161-01 1 CONN

BODY,PL,EL:3 WIRE

BROWN 80009

352-0161-01

-70 352-0165-02 2 HOLDER, TERM.CON:

7 WIRE,

RED

80009

352-0165-02

-79 352-0160-09 2 HOLDER, TERM.CON: 10

WIRE,WHITE 80009

352-0168-09

-00 131-0707-00

39

CONTACT,ELEC:O.40"L,

22-26 AWG WIRE 22526

47439

-01 175-0030-00 FT

WIRE,ELECTRICAL: 7 WIRE RIBBON

08261 TEK-17

5-0830-00

-02 175-0033-00 FT

WIRE , ELECTRICAL : 10

WIRE RIBBON 23499

TEK-175-0833-00

5-4

REV. B

JAN.

1975

Mechanical Parts

List—DM

502

Fig.

&

Index Tektronix

Serial/Model No. _

Mfr

No. Part No.

Eff Dscont

~

1 2 3

«

s

Name & Description Code Mfr Part Number

175-0825-00
175-0826-00

FT WIRE, ELECTRICAL: 2 WIRE RIBBON
FT

WIRE,ELECTRICAL:

3

WIRE RIBBON

23499 TEK-175-082S-00

08261 TEK-175-0826-00

ACCESSORIES

070-1726-00

010-6430-00

003-0120-00

1 MANUAL, TECH: INSTRUCTION (NOT

SHOWN)

1

PROBE: TEMPERATURE

(NOT

SHOWN)

1 TEST LEADS

:

(PAIR) (NOT

SHOWN)

80009

070-1726-00

80009 010-6430-00
80009

003-0120-00

REPACKAGING

065-0151-00

1 CARTON ASSEMBLY: (NOT

SHOWN)

80009

065-0151-00

REV. B JAN

1975

5-5

MANUAL CHANGE INFORMATION

At Tektronix, we continuolly strive to keep up

with lotest

electronic developments

by

odding circuit ond

component

improvements to our instruments os soon os they are

devel-

oped and tested.

Sometimes,

due

to printing ond shipping requirements,

we

can't

get these changes immediately into printed

manuals.

Hence, your manuol may contain new change

information on

following pages.

A

single change may affect several sections. Sections

of

the manual are often

printed at different times,

so

some of

the

information

on

the change

pages

may already be in

your

manual.

Since the

change information sheets are carried

in

the

manual

until ALL changes are permanently

entered,

some duplication may occur. If no such

change

pages

appear

in

this section, your manual is correct as printed.

MANUAL

CHANGE

INFORMATION

nm irT

EM 502

I CHANGE REFERENCE

C4

/

175

committed to

tochnlcol

oico/lonc*

PRODUCT

—ili-

070-1726-00

CHANGE REFERENCE.

DATE

1-27-75

CHANGE:

DESCRIPTION

NOTE:

ChanRes

are circled

below.

REAR

INTERFACE CONNECTOR

ASSIGNMENTS

Roor-vlow

ol

plus'"

*Tho*o output* mull bo

butfarod

bofor* using tham to data* aatarnal Input*. So* toil for sultoblo

buflfdng

circuit.

'UMd In th« DM 502.

Only

lhe

Temp Out. Temp Gnd. and HI and LO

inputs are factory wired The others must be

installed by

the user See accompanying

illustration lor lumper locations lor connections

BCD

outputs are

serialized

by

digits in an

8-4-2-

1

code. This code is not

valid when the

MSD

line is

high When the MSD and

the

one

are high the fourth significant digit is

a

one A two may also be

encoded

as

well

as

overrange

information.

PAGE

TEKTRONIX

MANUAL

CHANGE

INFORMATION

PRODUCT

DM 502 &

CHANGE

REFERENCE

M2

3

,279/REV

.

committed to

technical etcoltence

DM 502 Option 2

DATE

2-11-75

CHANGE:

070-1726-00

KFF SN 15020000-up

CHANGE TO:

DESCRIPTION

El.ECTR I

CAL

FARTS

LIST AND SCHEMATIC CHANGES

A

1

670-3495-01

CKT

HOARD ASSY :MAIN

A

1

670-3694-01

CRT BOARD ASSY: MAIN OPTION

2

Cl 97

290-0536-00

CAP. ,FXD,ELCTLT:10nF,207.,25V

Cl98

290-0527-00

CAP

.

,FXD,ELCTLT : 15pF

,207,

,20V

Cl99

290-0535-00

CAP. ,FXD, ELCTLT : 3 3pF

,

2

07,

,

10V

IU98

321-0202-00 RES.,FXD,FILM:1.24K

OHM,

17.,

0

R199

321-0202-00 RES.

,FXD, FILM: 1.24K OHM,

17.,

0

REMOVE:

C429

283-0279-00

CAP

.

,FXD,CER DI:0.001pF,207.,:

ADD

:

Cl

10 283-0279-00

CAP

.

,FXD ,CER DI :0 .OOlpF

,207.

,:

R200

321-0202-00

RES.,FXD,FILM:1.24K OHM,

17.,

0

DIAGRAM /f> ATTENUATORS &

CONVERSION CIRCUITS

-

Partial

1r

i

i

i

i

j

RtiO <

—

—)

0.1

?

’

1

CRIIO

A

1

—

i'-'y°

cU_.

SIIO •$>

—

A

5400

A

O-

%>

OB A-

.12V

,

Jrjj

U/95

ClW »I97

ftOuF

CBlOS 7

.

17

.

«

I

HM

-

,2W

CI9Z\

O.SpF

£

R.92

RI90

f

,0°*

RI9fl

RI99,

'•’-IK.

U«IV

•

-

.w • -w-

|

L*

L*

I

iw^jTgs^

V V

'

uaufl

nagyf

[33

ur

i v

s

1

OF