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LIK,

Model

281

O

i

INSTRUCTION

:

MANUAL

DIGITAL

MULTIMETER

Product

of

DYNASCAN

CORPORATION

1801

West

Belle

Plaine

Avenue,

Chicago,

Illinois

60613

Dear

Friend:

Congratulations

on

your

purchase

of

B

&

K—Precision

Test

Equipment,

and

welcorne

to

the

B

&

K

family.

We

hope

your

experience

with

your

new

test

equipment

will

make

you

a

lifetime

B

&

K

customer.

Your

instrument

is

backed

by

more

than

20

years

of

experience

in

designing

and

manufacturing.

Our

most

important

goal

is

your

satisfaction.

At

B

&

K,

test

equipment

is

made

to

meet

the

demands

of

the

field

focusing

on

dependability

and

accuracy.

We

also

concentrate

on

simplicity

and

operating

ease

with

features

that

reduce

the

possibility

of

human

error

and

speed

the

servicing

process.

In

order

to

determine

the

type

of

test

units

that

are

needed

we

have

been

guided

by

letters

and

reports

from

technicians

and

engineers

who

use

the

equipment

daily.

Our

field

tests

and

studies

have

helped

provide

better

and

faster

service

techniques.

Close

contact

has

been

maintained

with

the

manu-

facturers

of

consumer

products

which

our

test

units

will

be

checking

and

trouble-shooting.

Key

personnel

in

our

company

cut

their

eye

teeth

in

the

TV

service

business.

This

is

why

we

have

more

"sensitivity"

for

the

problems

and

conditions

under

which

the

test

equipment

will

be

used.

B

&

K

product

designs

are

constantly

reviewed,

and

refinements

are

made

or

new

models

developed

to

meet

advances

in

our

industry

and

to

fill

your

needs.

We

set

our

standards

high

so

you

can

be

assured

that

the

B

&

K

test

instruments

you

buy

represent

advanced

design,

quality

construction,

and

dependable

long-term

performance

at

a

price

you

can

afford.

If

you

have

any

comments

or

thoughts

about

our

products,

or

test

equipment

in

general,

I

would

be

delighted

to

hear

from

you.

Thanks

for

your

confidence

in

B

&

K

and

we

look

forward

to

serving

you

for

a

long

time

to

come.

Sincerely,

re

а

Carl

Korn

President

INSTRUCTION

MANUAL

FOR

Model

281

DIGITAL

MULTIMETER

B

&

K

DIVISION

OF

DYNASCAN

CORPORATION

1801

West

Belle

Plaine

Avenue

Chicago,

Illinois

60613

TABLE

OF

CONTENTS

Page

INTRODUCCION

„М

Аа.

ce

ce

2226”...

3

SDECIOCATMIONSE

т

уо

ышы

I

LT

зз»

I

RETE

3

CONTROLS

AND

FEATURES,

coce

tete

6

OPERATION

а

Le

8

Turning

Instrument

OWIE

EE

EP

EE

cde

„т

Мы

ол...

9

DCG:

Voltage

В

епі

АА

9

AG

Voltage

Measurements)

3...

9

IDG«CurrentiMcasurements

.

oeer

50.

Fm...

rer

rs

DEEST

10

AG

Gurrent

Measuremenis

Е...

vote

11

Resistance

Measurements

.......

оаа

о

о

I

MODEL

281

DIGITAL

MULTIMETER

THEORY

OF

GIDERUASIIQN.

КЕНЕ

a

ЖОККО

ЖИТТИ

no

СОО

S

NIE

12

MODEL

281

CALTBRATION

PROCEDURE”...

14

WARRANIEY

SERVICE

INSTRUCTIONS

.

..

35...

а...

.

RS

17

INTRODUCTION

Тһе

B

&

K—Precision

Model

281

Digital

Multimeter

is

a

significant

con-

tribution

to

the

instrumentation

market.

Low

cost

and

high

performance

have

been

engineered

into

this

instrument

to

make

available

to

the

service

technician,

industry

and

training

institutions

a

digital

multimeter

which

is

competitively

priced

with

existing

analog

meters

and

which,

at

the

same

time,

exceeds

the

performance

of

these

meters.

In

addition,

the

basic

instru-

ment

has

been

designed

for

maximum

simplicity

of

operation

and

minimum

error

of

reading.

The

basic

design

features

of

this

instrument

make

it

an

ideal

replacement

for

existing

VTVM's,

multimeters

and

FET/VOM’S.

The

instrument

is

"capable

of

measurement

of

DC

and

AC

current

and

Ohms.

The

high

input

impedance—10

megohms

on

all

yoltage

ranges—as

well

as

the

wide

resistance

range—10

ohms

full

scale

to

10

megohms

full

scale—make

this

instrument

an

ideal

replacement

for

conventional

analog

type

instruments.

In

addition

to

providing

equivalent

functions

and

ranges,

the

inherent

accuracy

of

this

instrument

provides

a

significant

margin

of

performance.

SPECIFICATIONS

DC

VOLTAGE

Ranres

Жеты...

--0—100mv,

1.00Volt,

10.0Volts,

100Volts,

1.00Kilovolt.

Oycuianpe

...

т...

100

percent

to

--

199гау,

1.99Volts,

19.9Volts,

199Volts,

1.5Kilovolts.*

Maximum

DC

Input

...1500

Volts

d-c

or

d-c

plus

a-c

peak.

EECGUITACY

ste

REC

+l

percent

of

full

range,

+1

digit.

Input

Impedance

......

10

megohms

Polarity

Switching

.....

Function

switch

provides

polarity

reversal

capa-

bility.

Wrong

Polarity

Indication

+

s

e.

If

a

DC

voltage

of

the

wrong

polarity

is

applied

to

the

input,

the

first

digit

(“1”)

will

remain

on

and

the

second

and

third

digits

will

remain

off.

Overrange

Indication

..If

the

input

voltage

exceeds

200

per

cent

of

full

scale,

the

first

digit

(“1”)

will

remain

off

and

the

second

and

third

digits

will

flash

on

and

off

to-

gether.

AC

VOLTAGE

(peak-reading

circuitry

calibrated

to

read

RMS

value

of

pure

sine

wave)

Ranges.

ТЕК

дам

0—100mv,

1.00Volt,

10.0Volts,

100Volts,

1.00Kilovolt

RMS.*

*Do

not

exceed

input

level

of

1500V

dc

or

1500V

(dc+ac

peak).

3

Я

Overrange

Maximum

AC

Input

..

Асёйтасу

И.

MOORE

Frequency

Response

..

Input

Impedance

......

Overrange

Indication

DC

CURRENT

REES

o

o

t

Voltage

Drop

(Measured

at

instrument

terminals).

Overrange

2

Accuracy

onm

...

Wrong

Polarity

Indication.

P

ы

Overrange

Indication

AC

CURRENT

Rappes

ыш.

2.

eee

Voltage

Drop

(Measured

at

instrument

terminals).

Отеапре

й.

„е-е

Сау

ЕА

Frequency

Response

Overrange

Indication

zc

1.5

per

cent

accuracy:

20Hz

to

1000925

*

Drame

бс

gie

100

per

cent

to

199mv,

1.99Volt,

19.9Volts,

.

199Volts,

1.00Kilovolt

RMS*.

dat

.1000V

RMS

or

1500Volts

peak.

ka

2-

1.5

per

cent

of

full

range

(Calibrated

с

|н».

10

megohms.

.

If

the

input

voltage

exceeds

200

per

cent:

T

full

scale,

the

first

digit

(*1")

will

remain

off

and

the

second

and

third

digits

will

blink

on

and

off

to-

gether.

*Do

not

exceed

input

level

of

1000V

RMS

or

1500V

peak.

Ф

0—100,a,

1.00ma,

10.0ma,

100ma,

1.00А.

.100ту,

at

full

range.

100

per

cent

to

199,a,

1.99ma, 19.9ma,

199ma,

1.99A.

z-

1.5

per

cent

of

full

range.

If

a

DC

current

of

the

wrong

polarity

is

applied

to

the

input,

the

first

digit

(“1”)

will

remain

on

and

the

second

and

third

digits

will

remain

off.

.

If

the

input

current

exceeds

200

per

cent

of

full

scale,

the

first

digit

("1")

will

remain

off

and

the

second

and

third

digits

will

flash

on

and

off

together.

0—100,a,

1.00ma, 10.0ma,

100ma,

1.00A.

100mV

RMS

at

full

range.

100

per

cent

to

199,2,

1.99ma,

19.9ma,

199ma,

1.994.

2

1.5

per

cent

of

full

range.

...20Н?

to

1000Hz.

.

.If

the

input

current

exceeds

200

per

cent

of

full

scale,

the

first

digit

(“1”)

will

remain

off

and

the

second

and

third

digits

will

flash

on

and

off

together.

RESISTANCE

Ranges...

.

Ne

0—10.0ohms,

100ohms,

1.00Kohm,

10.0Kohms,

айы

100Kohms,

1.00Mohm,

10.0Mohms.

Overrange

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

100

per

cent

to

19.9ohms,

199ohms,

1.99Kohms,

2,767)

19.9Kohms,

199Kohms,

1.99Mohms,

19.9Mohms.

Accuracy

un

à

2-2

per

cent

of

range,

10.0ohms,

to

1.00Mohm

I"

+3

per

cent

of

range,

10.0M

ohms

range

Test

Voltage

32:17...

0—10.0

ohm

range,

0.1

Volt

at

full

range;

100

ж

ohms

to

10.0Mohms,

1.0Volt

at

full

range.

Maximum

Test

Ситеп

Ж.С...

10ohms

10ma

oe

-

1000hms

10ma

22.

1Kohm

à

Ima

қ

10Kohms

100ua

"

aa

100Kohms

10да

1Mohm

lua

10Mohms

100na

CIRCUIT

PROTECTION

DC

Volts,

AC

Volts

....Diode

protection

together

with

series

current

limiting

resistance.

Ohms

Ranges

.........

Fuse

and

diode

protection.

OPERATING

TEMPERATURE

RANGE

10°С

to

40°C

No

degradation

in

accuracy.

POWER

SOURCE

......

117V

AC,

50/60Hz

POWER

CONSUMPTION

..........

15

Watts.

ACCESSORIES

(Included)

........

One

test

probe

assembly,

PR-21.

Instruction

manual

with

schematic

and

parts

list.

Spare

Ohms

fuse

(1/10A.,

3AG).

DIMENSIONS

......................--.-

Зот

WICHT

СЕ

м

5

Ibs.

5

site

CONTROLS

AND

FEATURES

(SEE

FIGURE

1)

Figure

1.

Operator's

Controls

and

Facilities

FUNCTION

switch

Selects

the

type

of

measurement

to

be

performed.

Also

used

to

turn

the

instrument

on

and

off.

RANGE

switch

Selects

the

desired

range

for

the

measurement

selected

by

the

FUNC-

TION

switch.

1A

jack

This

jack

is

used

when

measuring

dc

and

ac

currents

on

the

1A

range.

COM

jack

This

is

the

common

connection

to

the

instrument

input.

6

5:

10.

(+)

jack

This

is

the

“hot”

input

jack.

In dc

measurements

the

test

lead

connected

to

this

‘jack

is

normally

applied

to

the

positive

potential

point

in

the

circuit

under

test

when

FUNCTION

switch

is

in

the

+DCV

position.

NUMERICAL

READOUT

DIGIT

NUMBER

3

An

indication

between

0

and

9

is

obtained,

depending

upon

the

value

of

the

reading

displayed.

This

digit

is

identified

as

the

"3rd"

digit.

NUMERICAL

READOUT

DIGIT

NUMBER

2

A

reading

of

0

to

9

is

obtained,

depending

upon

the

value

of

the

measurement

performed.

This

digit

is

identified

as

the

"2nd"

digit.

NUMERICAL

READOUT

DIGIT

NUMBER

1

Either

an

off

(no

display)

or

a

“1”

is

displayed,

depending

upon

the

value

of

the

measurement

performed.

This

digit

is

used

when

readings

corresponding

to

full

scale

and

over

range

are

performed,

and

is

identified

as

the

"Ist"

digit.

Adjustable

Handle

'This

handle

can

be

used

for

carrying

the

instrument

and

can

also

be

used

as

a

tilt

stand

to

raise

the

front

panel

to

a

convenient

viewing

angle

when

desired.

The

handle

can

be

locked

into

any

desired

position

by

rotating

it

until

it

snaps

into

the

position

desired.

PR-21

Test

Probe

This

probe

is

used

for

all

measurements

performed.

This

probe

is

provided

with

a

selectable

100

КО

resistor

which

is

used

when

perform-

ing

dc

measurements

in

high

impedance

or

high

frequency

circuits.

The

resistor

isolates

the

cable

and

input

capacity

of

the

meter

from

the

circuit

in

which

the

measurements

are

performed.

This

reduces

capaci-

tive

loading

which

may

result

in

erroneous

reading.

NOTE

When

the

probe

resistor

is

used,

a

reading

error

of

minus

(—)

one

per

cent

is

introduced

because

the

100K

resistor

value

is

placed

in

series

with

the

internal

10

megohm

divider.

If

this

error

is

considered

signifi-

cant,

the

correction

is

made

to

the

reading

obtained

by

increasing

the

value

of

the

observed

reading

by

one

per

cent.

7

er

m

eee

OPERATION

S

EFL

t

TABLE

I

j

е

MEASUREMENTS

AND

INTERPRETATION

OF

=

DIGITAL

DISPLAYS

ae

<

TEE

T

SE

SET

CONNECT

DIGITAL

DISPLAY

|

À

TO

MEASURE

FUNCTION

RANGE

RED

.

FULL

100%

A

SWITCH

SWITCH

»

LEAD

-.

SCALE

OVERRANGE

.

+DCV/

0-100MV

+DCV/

100MW

(4)

Jack

100

199

—

-DCV

0-1V

—DCV

ІМ

e

(F)

Jack

1.00

1:99

0-10

V

10V

(+)

Jack

10:0

19.9

|

0—100

V

100

У.

-(-)

Jack

-

100

19%

|

А.

0—1000

У.

=

IKV

(+)

Jack

1.00

150%.

AC

0—100

MV

ACV

100

MV

(+)

Jack

100

199

Vorrs

0-1У

1V

(+)

Jac

1.00

1.99

0—10

V

10

V

(+)

Jac

10.0

199

-

0—100

V

100

V

(+)

E

100

199

0—1000

V

1KV

(+)

Jack

\

1.00

1.00**

DC

“0-100

na

РСА

100

na

(+)

Jack

7100

199

CURRENT

0—1

ma

1

ma

(+)

Jack

1.00—

1.99

0—10

ma

10

ma

(+)

Jack

10.0

19.9

0—100

ma

100

ma

(+)

Jack

100

199

0—1

Amp

1A

1A

1.00

1.99

AC

0-100

ya

АСА

100

ua

(+)

Jack

100

199

CURRENT

0—1

ma

]

ma

(+)

Jack

1.00 1.99

0—10

ma

10ma

(+)

Jack

10.0 19.9

0—100

ma

100

ma

(+)

Jack

100

199

0—1

Amp

1A

1A

1.00

1.99

OHMS

0-109

Onms

100

(+)

Jack

10.0

19.9

0—100

о

1000

(+)

Jack

100

199

0--1000

о

1Ко

(+)

Jack

1.00

1.99

0—10

Ko

10KQ

(+)

Jack

10.0

19.9

0—100

Ka

100KQ

(+)

Jack

100

199

0—1

Mo

1Mo

(+)

Jack

1.00

1.99

0—10

Mo

10Mo

(+)

Jack

10.0

19.9

Р

*Do

not

exceed

input

levels

of

1500

VDC

or

dc+ac

peak.

**Do

not

exceed

input

levels

of

1000

VRMS

or

1500

V

peak.

|

Table

I

is

provided

as

an

aid

in

operation

of

the

Model

281

and,

in

addition,

1

provides

interpretation

of

the

displays

obtained.

Note

that

the

decimal

location

changes

with

the

changes

in

position

of

the

RANGE

switch.

The

significance

of

the

decimal

location

must

be

known

to

assure

proper

inter-

pretation

of

the

readings

obtained.

Аааа

_