Fluke 871A Operating instructions

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JOHN

FLUKE

MFG.

CO.,

INC.

D.

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Preliminary

Operating

Instructions

ev

FLUKE

for

FLUKE

67

MODEL

871A

€

871AB

“nN

ALL

SOLID-STATE

DC

DIFFERENTIAL

VOLTMETER󰾰

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Ume

qS

TS

,

componEN

Serial

No.

and

above

JOHN

FLUKE

MFG.

CO.,

INC.

P.O.

Box

7428,

Seattle

33,

Washington

Preliminary

Operating

Instructions

for

®

MODEL

871A

€

871AB

ALL

SOLID-STATE

DC

DIFFERENTIAL

VOLTMETER

February

8,

1965

m

4

wA

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c

ARANA

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`

TABLE

OF

CONTENTS

Section

Title

Page

I

SPECIFICATIONS

1-1

II

OPERATING

INSTRUCTIONS

2-1

2-1.

Preliminary

Operation

for

Model

871A

.

2-1

2-2.

Preliminary

Operation

for

Model

871AB

2-1

2-3.

Battery

Charging

.

aoe ARR

AA

2-4.

Zeroing

Instructions

.

.

.

2-2

2-6.

Operation

as

a

Differential

Voltmeter.

2-2

2-7.

Operation

as

a

Conventional

Voltmeter

.

2-3

2-9.

Measurement

of

Voltage

Excursions

aboutlasNonumaleValue.

9

^

dom

tu

2

4

III

CALIBRATION

3-1

3-1.

General.

3

3-1

3-4,

Preliminary

Calibration.

3-2

3-5.

Null

Detector

Calibration

.

. . e

e

.

.

3-2

3-6.

10

Volt

Range

Calibration

.

. .

. .

. .

3-2

3-7.

1

Volt

Range

Calibration

3-3

3-8.

100

Volt

Range

Calibration

.

3-3

3-9.

1000

Volt

Range

Calibration

.

3-3

li

۳

SFA

۱1

I

=s

tut

vs

i^c)

I

af

ias

AS

T

n

,

rii

871A

&

871AB

SECTION

I

SPECIFICATIONS

AS

A

DIFFERENTIAL

VOLTMETER

DC

ACCURACY:

+(0.03%

of

input

voltage

+

10

uv)

from

0

to

1100

VDC.

VOLTAGE

RANGES:

1,

10,

100,

1000VDC

with

10%

overvoltage

capability

on

each

range.

NULL

RANGES:

Input

Range

|

Null

Ranges

1V

|

0.001,

0.01,

0.1

V

10

V

0:001,

70-017

2031

LIN,

100

V

0.01

0

L

DOMO

1000

V

0.1,

1,

10,

100

V

DC

INPUT

RESISTANCE:

Infinite

at

null

from

0

to

11

VDC;

10

meghoms

above

11

VDC.

METER

RESOLUTION:

10

uv

maximum.

VOLTAGE

DIAL

RESOLUTION:

10

uv

xaximum.

AS

A

CONVENTIONAL

VOLTMETER

ACCURACY:

3%

of

range.

RANGE:

Voltage

Range

DC

Input

Resistance

1000-0

-1000

10

Meg

100-0-100

1!

10-0-10

y

1-0-1

"n

*0.1-0-0.1

À

*0.01-0-0.

01

ü

*0.

001-0-0.

001

1

Meg

NOTE:

10%

overvoltage

capability

on

each

range.

*These

ranges

obtained

by

using

null

ranges

with

all

four

voltage

readout

dials

set

to

zero.

1-1

871A

&

871AB

GENERAL

ELECTRICAL

DESIGN:

Completely

solid-state.

REGULATION

OF

REFERENCE

SUPPLY:

0.001%

for

a

10%

line

voltage

change.

INPUT

RESISTANCE

OF

NULL

DETECTOR:

10

megohms

on

two

highest

null

ranges

for

all

input

ranges;

1

megohm

on

two

lowest

null

ranges

for

all

input

ranges.

REFERENCE

ELEMENT:

Temperature-compensated

zener

diode.

DC

COMMON

MODE

REJECTION:

130

db.

AC

REJECTION:

Frequency

Normal

Mode

Common

Mode

50

cps

60

db

90

db

60

cps

60

db

85

db

84

cps

60

db

70

db

120

cps

10

db

80

db

400 cps

75

db

70

db

5

ke

80

db

60

db

20

kc

85

db

60

db

OPERATING

TEMPERATURE

RANGE:

Within

specifications

from

559F

to

95°F.

Within

0.

05%

from

32°F

to

1229F.

STORAGE

TEMPERATURE

RANGE:

871A

-409F

to

1589F

871AB

-409F

to

140°F

KELVIN-VARLEY

ACCURACY:

+0.01%

of

output

from

1/11

of

full

scale

to

full

scale.

RECORDER

OUTPUT:

Adjustable

from

0

to

+20

mv

minimum

for

full

scale

right

and

left

deflections.

POLARITY:

Selectable

via

front

panel

switch.

SHOCK

AND

VIBRATION:

Meets

requirements

of

MIL

-T

-945A.

INPUT

POWER:

Model

871A

-

115/230

VAC

+10%,

50

-

440

cps;

Model

871AB

-

115/230

VAC

+10%,

50

-

440

cps

and

rechargeable

battery

operation

(minimum

30

hours

operation

on

full

charge).

SIZE:

7"

high

x

8-1/2"

wide

x

11-3/4"

deep.

WEIGHT:

Model

871A

-approximately

12

lbs.

=

Model

871AB

-approximately

14

lbs.

1-2

871A

&

871AB

SECTION

II

OPERATING

INSTRUCTIONS

2-1,

PRELIMINARY

OPERATION

FOR

MODEL

871A

a.

Connect

power

plug

to

a

115

volt

AC

power

source.

If

instrument

has

been

wired

for

230

volt

operation,

connect

to

230

volts

AC.

NOTE:

The

round

pin

on

polarized

plug

connects

instrument

case

to

power

system

ground.

Use

three-to-two

pin

adapter

supplied

with

instrument

when

connecting

to

a

two-contact

receptacle.

For

personnel

safety,

connect

short

green

lead

to

a

good

earth

ground.

b.

Set

switches

on

871A

voltmeter

as

follows:

RANGE

1000

NULL

TVM

(transistorized

voltmeter)

polarity

+

(positive)

all

voltage

0

(zero)

readout

dials

2-2.

PRELIMINARY

OPERATION

FOR

MODEL

871AB

a.

For

line

operation,

connect

power

plug

to

a

115

volt

AC

power

source.

If

instrument

has

been

wired

for

230

volt

operation,

connect

to

230

volts

AC.

NOTE:

The

round

pin

on

polarized

three-prong

plug

connects

instrument

case

to

power

system

ground.

Use

three-to-two

pin

adapter

supplied

with

instrument

when

connecting

to

a

two

-contact

receptacle.

For

personnel

safety,

connect

short

green

lead

to

a

good

earth

ground.

b.

For

line

operation,

set

POWER

switch

to

LINE

OPR.

c.

For

battery

operation,

set

POWER

switch

to

BAT

CHECK

and

wait

for

10

seconds.

Meter

needle

should

indicate

in

BATTERY

OK

region.

If

not,

charge

batteries

as

outlined

in

paragraph

2-3.

If

batteries

are

charged,

set

POWER

switch

to

BAT

OPR-LINE

ISOL.

2-1

871A

&

871AB

d.

Set

controls

on

voltmeter

as

follows:

RANGE

1000

NULL

TVM

(transistorized

voltmeter)

polarity

+

(positive)

all

voltage

0

(zero)

readout

dials

2-3.

BATTERY

CHARGING

a.

Connect

power

plug

to

a

115

volt

AC

power

outlet.

If

instrument

has

been

wired

for

230

operation,

connect

to

230

volts

AC.

b.

Set

POWER

switch

to

BAT

CHG-LINE

OPR.

After

16

hours,

batteries

will

be

fully

charged

and

capable

of

operating

the

instrument

for

at

least

30

hours.

While

the

batteries

are

being

charged,

the

instrument

may

be

operated

the

same

as

for

line

operation.

CAUTION:

Since

overcharging

decreases

battery

life,

it

is

recommended

that

the

batteries

be

charged

for

less

than

48

hours

and

never

more

than

1

week.

When

used

properly,

the

batteries

will

give

more

than

200

charge-discharge

cycles

of

operation.

2-4.

ZEROING

INSTRUCTIONS

2-5.

From

time

to

time,

it

may

be

necessary

to

adjust

the

internal

meter

zero

control.

This

will

normally

be

done

at

somewhat

more

frequent

intervals

than

complete

instrument

calibration.

Proceed

as

follows:

a.

Perform

preliminary

operation

as

stated

in

paragraph

2-1

or

2-2.

b.

Mechanically

zero

the

meter

with

the

adjustment

screw

on

the

front

of

the

meter

case.

If

the

instrument

top-back

cover

is

on,

it

must

be

shut

off

for

at

least

three

minutes

prior

to

this

adjustment.

If

the

top-back

cover

is

off,

another

method

would

be

to

short

out

the

internal

meter

terminals

prior

to

zeroing.

c.

Set

POWER

switch

to

ON

with

871A

or

to

LINE

OPR

with

871AB

and

allow

a

5

minute

warmup

period.

d.

Set

RANGE

switch

to

1,

voltage

readout

dials

to

zero,

and

NULL

switch

to

0.

001.

e.

Short

INPUT

post

to

COMMON

post

and

remove

right

side

panel.

f.

Adjust

electronic

zero

control

R227

until

meter

needle

indicates

zero

when

side

panel

is

replaced.

g.

Remove

short

between

INPUT

and

COMMON

post.

2-6.

OPERATION

AS

A

DIFFERENTIAL

VOLTMETER

a.

Perform

preliminary

operation

as

stated

in

paragraph

2-1

or

2-2.

b.

Connect

unknown

voltage

between

INPUT

and

COMMON

posts.

If

one

side

is

grounded,

always

connect

it

to

the

COMMON

post.

2-2