BK Precision 290 Service manual

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Deqr Friend:

Congrotulqtions

Equipment,

Test

your

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Your instrument experience in designing importcnt

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feqtures thqt Process.

In order to determine the guided equipment doily. Our field tests Icster service facturers of trouble-shooting.

personnel

Key

is why we hqve more

This which

B & K

new models developed to meet

or needs. We inskuments

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consumer

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We

also concentrqte on simplicity

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Sincerely,

CqrI Korn President

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TABLE OF

CONTENTS

Page

GENERALDESCRIPTION

AND SPECIALFEATIJRES

SPECIFICATIONS OPERATING

CONTROLS

OPERATINGTHEMODEL29O.

SafetyPrecautions... Preparation for Making

Meazurements MeasuringDCVoltages... 7*ro

Center

Voltages

DC

MeasuringACVoltages...

Measurements

dB MeasuringResistances...

Measuring AC Current. . . .

MeasuringDCCurrent....

50

Meazuring DC Currents below

CALIBRATION

AND MAINTENANCE

mA

......

.,...6

.....7

.....10

. . . .

....13

. . . . .

.....14

3

3 6

6 7

7 7 8

12

13

CIRCI]IT WARRANITY SERVICE

DESCRIPTION.

INSTRUCTIONS

WARRANTY

..17

....19

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OHMS MEASI,JREMENT:

8 Lnw Voltage

(33mV):

7 Normal Voltage

Midscale

Accuracy:

DC CURRENT:

Ranges

(1.25V):

Reading:

RXO.I, RX100K,

RXl, RxlM.

l0

t3o

RXl,

ru(lM.

RX10, RX100, RXIK,

(timesmultiplier)

(+4"

of

arc,

of

RXl0,

RXl00,

arc on RX0.1

RXIK, RXI0K,

RX10K,

and

RXI0OK,

RXIM ranges).

'

10 Ranges

Accuracy: Internal Voltage

AC CURRENT:

Ranges:

10

Accuracy: !4%

Internal Frequency

DECTBEL

l0 Ranges: Accuracy: Reference:

RESISTORS:

Voltage

Drop:

Response:

(dB):

50pA,

150mA, 500mA

!37o 50mV

50pA,

lsOmA, 50OmA,

ranges. 50mV,

+.5d8, +3d8,

-40 !3Vo

lmW into

l50pA,

full

scale;

at

instrument

l50pA,

full

scale

at

instrument

20llz to

TlIz to

+66.

to

full

of

600 ohms.

5001rA,

and 1.5

+

4% on

500pA,

and

@ 6011z,,

5kHz,

l6kHz,

scale.

l.SmA,

Amp

1.5

input terminals,

l.smA, smA,

1.5 Amp full

input terminals,

50ouA

500uA

(.775V]_

5mA,

full

Amp Range.

lsvo

on 50pA

to

l5&nA

to

l50mA

scale.

l5mA, 50mA,

to

50mA range.

l5mA, 50mA,

and 1.5

to 50mA

ranges.

unp

range.

Multipliers: Current

Ohms

METER:

Shunts:

Shunts

trLVo

Precision

l%Precision

:

ZVoPrecision

7", l001rA,!2Vo,100". DC zero Mirrored

center

scale.

Type

TYPe

Type

scale.

-

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Electronic

This

following

1).

is a brief description

METER ZERO

l.

adjustment screwdriver front very

slowly turn the

FI,JNCTION

2. ments to

3. RANGE resistance

4.

OFF-ON SWITCH ZERO the

meter meter at zero on when OFF.

5. OHMS CONTROL: switch OHMS meter.

PROBE

6. allow accurate When the with

the test lead. when probe voltage.

7. ADJUSTABLE HANDLE: instrument can be

Multimeter

ADJUST

must be made before the

(preferably

panel

immediately

SWITCH:

performed.

be SWITCH: Used to

to

be measured.

control

using this feature. Push

in one of the control

making DC voltage

switch to the DIRECT

placed

shaft

is ON. Rotate the

the

for a full

SWITCH: This

AC

switch is

This isolates the

in a convenient sloping

either

in

OPERATING CONTROLS

is as simple

of each

(MECHANICAL):

non-metallic)

below

mechanical

Used to

select

ZERO

AND

outward.

meter scale

The

OHMS control is adjusted with the FUNCTION

positions

OHMS

scale

indication, infinity

instrument is

measurements in the

the

100K

in

measurements

The carrying handle

a vertical or horizontal

to

operate as a

control and

into

the

meter

zero

adjust until the

select the

the

CONTROL:

The red lamp on the

ZERO

control to

position

or

to

ZERO

the

and

position,

cable capacity

position

how

The mechanical meter

instrument

the

slot

face. While

desired

equipped

for

range

To

the

control

with the

(oo)

presence

a l00K resistor

RF, IF or

in

all measurements

may be used

for

position.

conventional

(refer

used

it is

turned

is

located

pointer

function for

turn the

meter

position

pointer

shaft

test leads open.

on

with a strielded test lead to

of strong

from

easy

the

in

gently

rests at

of current, voltage,

meter

glow,

will

the

on the zero

to turn the meter

in

ohms

the

electrical

switched

is

the

circuit under

sweep circuits. Set

viewing. The case also

WVM. The

Figure

to

zero

on.

Insert a

of the

center

tapping meter,

zero.

the measure-

or

pull

on,

pointer

Rotate

scale

other than

to

support the

the

indicating

of

the

center

the

of the

fields.

in series

test

the DC

OPERATING

SAFETY

A certain amount of electrical equipment familiarize tested, high voltages equipment.

himself

before any

often

work

THE MODEL

PRECAUTIONS

danger

and therefore, the user

as much

performed.

is

appear

always

is

possible

as

It should be

at unexpected

290

present

with the equipment to

when working

cautioned to always

is

kept

points

mind that

in

in defective

on

be

BK Precision 290 Service manual

Specifications and Main Features

Frequently Asked Questions

User Manual

OPERATING CONTROLS