Tektronix DM 502 Manuale utente

Tektronix,

Inc

Box500

Beaverton,

Oregon

97005



Serial

Number

070-1726-00

TEKTRONIX

IVI

502

DIGITAL

IVI

INSTRUCTION

MANUAL

First

Printing

Aug

1974

WARRANTY

All

TEKTRONIX

instruments

are

warranted

against

defective

materials

and

workmanship

for

one

year

Any

questions

with

respect

the warranty

should

taken

with

your

TEKTRONIX

Field

Engineer

representative

All

requests

for

repairs

and

replacement

parts

should

directed

the

TEKTRONIX

Field

Office

representative

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

service

Specifications

and

price

change

privileges

reserved

1974

Tektronix,

Inc

Beaverton,

Oregon

Printed

the

United

States

America

All

rights

reserved

Contents

this

publication

may

not

reproduced

any

form

without permission

Tektronix,

Inc

.S .A

and

foreign

TEKTRONIX

products

covered

and

foreign

patents

and/or

patents

pending

TEKTRONIX

registered

trademark

Tektronix,

Inc

CHANGE

INFORMATION

REV

OCT

1974

Accessories

Repackaging

Exploded

View

502

TABLE

CONTENTS

Page

SECTION

OPERATING

INSTRUCTIONS

Introduction

1-1

Instrument

Description

1-1

Installation

and

Removal

1-1

Operating

Considerations

1-2

Input

Connections

1-2

Function's

Available

Rear

Connector

1-2

Sine

Wave

Response

1-3

Temperature

Measurements

1-3

Making

Measurements

1-4

Voltage

Measurements

1-4

Current

Measurements

1-4

Voltage,

Current

and

Resistance

Measurements

1-5

Decibel

Measurements

1-5

Temperature

Measurements

1-5

Using

Transistor

Temperature-Sensing

Device

1-5

Accurate

Current

Source

1-6

Specifications

1-6

SECTION

THEORY

OPERATION

Introduction

2-1

Attenuator

and

Input

Switching

2-1

Converter

2-1

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

SECTION

ELECTRICAL

REPLACEABLEPARTS

LIST

SECTION

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

SECTION

MECHANICAL

REPLACEABLE

PARTS

LIST

502

nalm

mn'

Instrument

Description

The

502

Digital

Multimeter

measuresdo

and

voltage

and

current,

dBm,

dBV,

resistance

and

temperature

The

functions

are

average

responding

and rms

calibrated

for

sine

waves

single

front

panel

control

selects

all

ranges

front-panel

pushbutton

selects

readout

functions

in lieu

voltage

current

Rear

interface-connector

input

also

pushbut-

ton

selected

from

the

front

panel

Values

are

obtained

adding

the

selected

range

value

the

display

reading

Readout

dBm

dBV

chosen

internal

jumper

The

unit

shipped

with

the

jumper

the

dBm

position

internal

jumper

also

permits

selection

fet

input

1000

Mil)

or 10

Mil

input

impedance

on the

two

lowest dc-

voltage

ranges

The

unit

shipped

with

the

jumper

the

Mil

position

See

Fig

1-2

Temperature measurements

are

made

using a

Tektronix

P6430

probe

(Tektronix

Part

Number

010-6430-

00)

other

suitable

sensing

devices

Option

in-

struments

delete

the

temperature

measuring

capability

The

readout

3-1/2

digit

display

using

seven-

segment

LED's

The

decimal

point

automatically

positioned

the

range-function

switch

Polarity

indica-

tion

automatic

usable

50%

overrange

exists

all

measurement

modes

except

ac voltage

and

current,

1000

dc,

and

the

current

range

overrange,

the

display

blinks

and

the

most

significant

digit

suppressed

Upon

exceeding

the

available

50%

overrange,

appears

the

most

significant

digit

position

Display readings are

invalid

beyond

this

point

REV

OCT

1974

INTRODUCTION

Section

1-113M

502

OPERATING

INSTRUCTIONS

Interlaced

bcd

output

(1,

3, 2, 4)

referenced

the

low

input,

available

the

rear

interface

connector

user

wired

NOTE

The

502

not

directly

compatible

with

the

153

Calculator

Interface

The

maximum

input

voltage

kV,

350

the

rear

connectors

The

front-panel

and

connectors

maybe

floated

maximum

aboveground,

the

rear

inputs

350

Installation

and

Removal

The

502

calibrated

and

ready

for

use

when

received

operates

any

compartment

500

series

power

module

See

the

power

module

instruction

manual

for

line

voltage

requirements

and

power

module

operation

Fig

1-1

shows

the

502

installation

and

removal

procedure

Turn

the

Power

Module

off

before

inserting

the

502

Otherwise,

arcing

may

occur

the

rear

inter-

face

connectors,

reducing

their

useful

life

and

damage

may

done

the

plug-in

circuitry

Check

that

the

502

fully

inserted

the

Power

Module

Pull

the

PWR

switch

the

Power

Module

One

characters

the

LED

display

should

now

visible

The

Controls,

Connectors

and

Adjustments

foldout

page

Section

3gives

complete

description

the

front

panel

Operating

Instructions-DIM

502

Input

Connections

Three

binding

posts

provide

measurement

connec-

tions

The

and

posts are

normally

used

for

all

measurements

except

temperature

Normal

measurement

conditions

will

with

the

terminal

ungrounded

connection

between

the

and

GND

posts

may

made

referencethe

input

against

502

chassis

ground

Use

caution,

as the

terminal

then

connected

earth

ground

through

the

three-wire

powercord

Falsereadings

may

be obtained

due

ground

loops

the

INPUT

button

pushed

in,

signal

inputs

are

made

via

the

rear

interface

connector

;

the button

out, signal

inputs

are

made

via

the

front

panel

Functions

Available

Rear

Connector

HI,

LO,

GROUND,

temperature

output

per

degree

and bcd

connections

are

available

the

rear

Fig

1-1

502

Installation

and

removal

OPERATING

CONSIDERATIONS

interface

connector

The

Rear

Interface

Connector

Assignments

page

the

Service

Section

the

rear

this

manual

gives

data

the

various

connections

Only

the

Temp

Out,

TempGnd

and

inputsare

factory-

wired

Jumper

holes

are

provided

for

making

the

desired

bcdoutput

connections

See

the

wire

locations

illustration

the

foldout

pages

for the

correct

circuit

board

locations

Simply

insert

and

solder

insulated

wire

strap

the

proper

locations

Buffers

are

required

before

the

data

outputs

are

used

to drive

external

loads

See

Fig

1-3

for

typical

buffer

circuit

The

502

has

slot

between

pins

and

barrier

the

corresponding

position

the

power

module

jack

allows

only

compatible

plug-ins

used

that

compartment

This

protects

the

plug-in,

should

specializ-

connections

made

to that

compartment

Consult

the

Building

System

section

the

power

module

manual

for

further

information

FET

input

jumper

position

dBm

jumper

position

dBV

jumper

position

Connect

jumperon

reverse

side

board

shown

hard

wire

range

Sine-wave

Response

The

502

responds

to the

average

value

of a

sinusoidal

current

voltage

The

readout

indicates

the

equivalent

rms

value

The

effective

rms

value

of a

sine

wave

.707

times

the

peak

voltage

current

The

average

value

.636 of

the

peak

value

The

scale

factor

the

502

.636/0

.707

Multiply

the

502

readout

obtainthe

average

value

of a

sinusoidal

input

voltage

current

Operating

Instructions-DM

502

Fig

1-2

Locations

reference

jumper,

input

impedance

jumper,

and

hard wired

component

wire

changes

Temperature

Measurements

Connect

the

P6430

(or

other sensing

device)

the

connector

marked

TEMP

PROBE

Use

care

to align the

connector

pins properly

Select

calibration

°F

°C

with

the

range-function

switch

For

best

accuracy,

calibrate the individual

instrument

the

probe

used

See

the

Internal

Adjustment

Procedure

the

service

section

this

manual

for

the

proper

procedure

Operating

Instructions-DM

502

Input

i-5

Floating

ground

Output

2N3565

other

transistor

with

minimum

beta

150

Fig

1-3

Typical

buffer

circuit

for

rear

connector

data

outputs

may

used

from

the

502

supply

Voltage

Measurements

MAKING

MEASUREMENTS

With the

502

properly

installed

the

power

module,

allow twenty

minutes

warmup

time

for

operation

specified

accuracy

When

the value

the

quantity

being

measured

unknown,

select

the

highest

range

first

Decrease

the

range

setting

until

the

display

blinks

in-

dicating

over-range

Then

increase

the

range

switch

the

higher

position

This

method

obtains

maximum

resolution

Resolution

the

502

.05%

full

scale

setting,

except

temperature,

which

not

exceed

the

maximum

voltage

ratings

With the

range-function

switch

the

VOLTS

500

VOLTS

position,

internal

damage

may

result

before

overrange

indicated

Select

an appropriate

full

range

voltage

position

with

the

range-function switch

Apply

the

voltage

measured

the

INPUT

binding

posts

Observe

the

maximum

voltage

ratings

indicated

the

front

panel

The

readout

displays

the

input

positive

with

respect

the

input

displayed

the

input

positive

With

the

input

shorted,

the

display

reads

zero,

one

count

The

Temp

Out

terminals

atthe

rear

interface

connector

are

always

connected

the

output

the

temperature

circuitry

This

feature

provides

continuoustemperature

monitoring

capabilities

°C

even

while

using other

functions

the

502

avoid

momentary

scale

change

when

a recorder

other device

connected

these

terminals

avoid

switching

through

the °F

position

The

502

may

hard wired

either

the

°C

°F

range

independent

the

range-function

switch

setting

hard wire

the

range,

connect

jumper

shown

Fig

1-2

hard wire

lift

either

end

R285

shown

Fig

1-2

prevent

possible

damage

switch

contacts

high

currents,

not

switch

into,

out

of,

through

the

current

measurement

modes

from

the

other

measurement

modes

with

a high current

source,

large inductive

capacitive

load,

connected

the

502

input

This

caution

does

not

apply

switching

between

individual

current

ranges

the

maximum

stated

input

current, as

the switch

contacts are

adequately

protected

for

this

operation

Current

Measurements

Select

appropriate

full

scale

DCmA

position

the

range-function

switch

Apply

the

current

measured

the

INPUT

binding

posts

current

(electron

flow)

into

the

connector

and

out

the

connector

indicates

display

For

opposite

current

flow,

will

be displayed

REV

OCT

1974

Voltage,

Current

and

Resistance

Measurements

Select

appropriate

full

scale

VOLTS,

ACmA

OHMS

position

the

range-function

switch

Connect

the

unknown

voltage,

current

resistance

the

INPUT

binding

posts

Decibel

Measurements

use

this

feature,

switch

voltage

current

range

and

push

the button

marked

the

front

panel

Connect

the

voltage

current

source

the

502

arrive

the

correct

reading, algebraically

add

the

number

the

outside

scale

the

display reading

When

the

switch

depressed, the

decimal

point

fixed

and

the

maximum

display

reading

.99

all

scales

For

example,

the

range-function

switch

the2

VOLTS

position

and

the

display

reading

+13

.98,

then

the

correct

reading

+13

.98

-20

.00



.02

the

range-function

switch

the

200

ACmA

position

and

the

display

reads

-4

.04,

then

.04

+20

.00

+15

.96

Selection

readout

dBV

ordBm

accomplished

jumper

shown

Fig

1-2

The

reference

for

dBV

when

measuring

voltage

one

volt

and

when

measuring

current

one

milliampere

The

reference

for

dBm

the

voltage

range

one

milliwatt

dissipated

6000

or0

.7746

volts

;

the

current

measuring

range

the

reference

.7746

milliamperes

When

dBm

dBV

applied

current

measurements,

they

have

significance

other

than

the

reference

current

stated

above

Useful

formulas are

logio

2 ,

logio



and



logio

REV

OCT

1974

Operating

Instructions-DM

502

For

calculations

substitute

the reference

voltage

current

listed

as the

denominator

Temperature

Measurements

With

the

P6430 probe

connected

the

front

panel

connector

labeled

TEMP

PROBE,

set

the

range-function

switch

the

°F

°C

the

TEMP

position

Apply

the

probe

sensor

tip

the

device

being

measured

For

optimum

temperature

transfer,

coat the

surface

the

device

being

measured

with

silicone

grease

and

apply

the

probe

tip

squarely

the

surface

Allow

sufficient

time

for

the

probe

tip

stabilize

before taking

a reading

The

time

required

depends

upon

several factors

Generally,

when

the

tip

first

applied

thedevice

under

test,

the

readings

change

rapidly

the

probe

tip

temperature

approaches

the

temperature

the device

under

test,

the readings

change

less rapidly,

and

finally

stabilize

The

readings are

°C

°F,

depending

the

position of

the

range-

function

switch

See

the

P6430

manual

for

informa-

tion

temperature

measurements

and

probe

use

Using

Transistor

Temperature-Sensing

Device

Certain

npn

transistors

such

2N2484

can

used

as separate

sensors

place

the

P6430probe

with

little

or no

selection

the

transistor

Connect

thetemperature-

sensing

transistor

the

502

through

the

TEMP

PROBE

connector

shown

Fig

1-4

Accuracy

without

recalibration

the

502

within

±8°

150'C

the

Sensing

Transistor

(2N2484)

Connector

shell

Connector

TEKTRONIX

Part

Number

131-1653-00

Fig

1-4

Schematic

diagram

temperature-sensing

transistor

connected

probe connector

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