DATA PRECISION 1350 User Manual

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62-5008

MODEL

1350

a.

The

trouble

shooting

procedures

for

the

Model

1350

DMM

are

Illus

trated

in

the

sequence

of

illustrations,

Figures

5-4

through

5-7,

while

Figure

5-8

illustrates

some

of

the

waveforms

that

confirm

proper

per

formance

in

some

of

the

tests.

b.

Test

instruments

and

reference

standards

needed

for

the

trouble

shooting

anaiysis

should

meet

or

exceed

the

specifications

shown

in

table

5-1.

Table

5-1

TEST

AND

REFERENCE

STANDARDS

PARAMETER

SPECIFICATIONS

MFG/MODEL

NO.

DCV

(DMM)

Oto

±

10V

DATA

PRECISION/175

Frequency

40

Hz

±

0.5%

DATA

PRECISION/585

Oscilloscope

5

MHz

BW

TEKTRONIX/T921

DCV

STANDARD

Oto

±

10V

±

0.5%

ANALOG

IC/AN3100

ACV

STANDARD

Oto

IVRMS

±

1%

H.P./745A

The

sequence

in

Figure

5-4

checks

the

operation

of

the

power

supply

cir

cuits

from

the

input

transformer

through

to

the

outputs

of

Voltage

reg

ulator,

Z7.

It

assumes

that

the

line

fuse

has

been

checked

per

the

proce

dure

of

Figure

5-1,

and

as

indicated

in

paragraph

5-2.

Note

that

all

dc

level

measurements

are

to

be

made

with

respect

to

positive

rail,

at

TP2.

5.6

REFERENCE

POWER

SUPPLY

TEST

5-6

€'

C

The

sequence

in

Figure

5-5

checks

the

operation

of

the

circuits

that

gen

erate

the

reference

supply

for

the

AID

conversion

in

voltage

or

current

measurements.

(Resistance

measurements

derive

their

reference

supply

values

from

the

standard

resistance

set

in

the

voltage

attenuator

and

from

the

high

or

low

level

voltage

source.)

Note

that

the

reference

supply

is

100

millivolts,

generated

across

resistor

R9.

The

resistance

of

R8, R9,

and

RIO

are

1%

tolerances

and

should

permit

the

variable

adjustment

of

R7

to

bring

the

value

across

R9

to

the

desired

100

mV.

In

exceptional

cases

a

factory-selected

trimming

resistor

R31,

or

R32,

may

have

been

installed

to

obtain

the

desired

calibrations.

opyright

1977.

Data

Precision

Corporation.

AH

right

Table of Contents

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DATA PRECISION 1350 Specifications

General

Brand	DATA PRECISION
Model	1350
Category	Multimeter
Language	English