BK Precision 290 Service manual

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Deqr Friend:

Congrotulqtions

Equipment,

Test

your

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mcke you

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Your instrument
experience in designing
importcnt

equipment is
qnd qccurqcy.

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

dependcble

you

If

generol,

in

mqde

reduce the

by letters

techniques. Close

consumer

the test

product

set

you

long-term

qny

hqve

I would be

to meet the

We

also concentrqte on simplicity

qnd

reports

products

in our

eguipment will

our

company cut

desigrns

stqndqrds

buy represent

performonce

comments or

delighted

demqnds of the

possibility

type

from

"sensitivity"

be

crre constantly reviewed,

high so

your purchose

on

qnd

welcome to the

experience

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lifetime B d K

bocked

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of test units thqt

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which our test

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design,

price you

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of

B & K Icnnily. We

your

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sqtisfqction.

field focusing

error crnd

units

problems

in our industry ond

con

products,

our

you.

new

test equipment

customer.

by more thqn 20

mqnufocturing. Our most

At B & K, test

on

crnd operoting ecse with

speed the

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engineers

provide

be checking ond

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service

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dependcbility

servicing

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who use the

test

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better

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business.

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Thqnks

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confidence

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B d

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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

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:

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.

scale.

l5mA, 50mA,

to

50mA range.

l5mA, 50mA,

and 1.5

to 50mA

ranges.

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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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

position

how

The mechanical meter

instrument

the

slot

face. While

desired

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

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d.

Set the
the

circuit the

e.

Observe the
rotate
meter
of

the
range
of

the
center zero
instrument

balanced
condition
direction.

RANGE

the

deflection.

center

being

scale represents

condition

selector

same as

meter

RANGE

Positive

zero

used. For

scale

is used

will

cause

pointer

mark. Each

is to

in the

will result

switch fully

for

DC

voltage

indication

switch

example,

counterclockwise

voltages

.25

volt and each

indicate

some deflection

will

side of

when

a

balanced

alignment

reading

in a

clockwise

measurement.

on the

make

the

the

division

of

in either

and

black

to

pointer

the

scale lepresents

.5 volt range

.01

condition. For

an FM

of zero

on the meter.

connect the test

scale marked

obtain

volt. The

discriminator,

the

the

deflect to

one-half

is being used,

purpose

example,

positive

leads

"O"

best

useable

the right

of

each

for

if this

the

desired

A

misaligned

or

negative

to

and

the

half

the

r

4. MEASURING

Effect
employs a peak-to-peak
sinusoidal

effective
other than
that the
apply. However,
peak-to-peak

a.

Set

b.

Set

c.

Set
set RANGE

d.

Short
over

e.

Connect the
reference

f.

Bring
voltage

g.

Observe
below the
two
by the

of waveform

signal.

values

accuracy

the FUNCTION
the PROBE

the RANGE

switch

test leads

zero

mark on VOLTS/MA

point

the

tip

is to

the meter

mirrored scale on the

red

scales marked VOLTS

same

AC VOLTAGES (RIvlS

NOTE

measuring

in

type

detector,

The scale

based

sinusoidal

as

peak-to-peak

scales on

switch to the

switch to DIRECT.

switch to

fully

together

(negative)

black

of

the

probe

of

the

be measured.

indication. RMS voltage

multiplier

is calibrated

on

a true

signals

the meter.

circuit under

factors

are

specified for

values

AC V

the desired

clockwise.

and rotate ZERO

scale.

lead

of the test

in contact

meter.

P-P

were

as

P-P):

&

AC voltages:

and

give

to

sinewave. When

being

used,

sinusoidal waveforms will not

will remain

position.

position.

control until meter

test.

with

the

is

To measure

are used.

used

The

DC voltage

in

This instrument

is

calibrated using a

RMS

readings,
is

it

it must be

accurate using the

If the

voltage is

lead

assembly to the

point

read

the

in

on the two red

peak-to-peak

readings

scale

measurements.

known

recognized

circuit

using

that

not known,

pointer

are multiplied

rests

chassis or

where

scales

voltage,

the

just

the

6

'1

s.

MEASUREMENTS:

dB

The dB
according

scale

to the

(-10dB

standard of

to

+6dB)

lmW

for

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MEASI.JRING

6.

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making re$stance
equipment
applied to theohms

a. Hi

frms Measnuements.

the

HI

OHMS

resistance
When
pointer
(c)
rotate
Remove

meter
meter. Be sure

the

high
ranges,
Remember
and reverse

b.

Cheching for
(SCR):
the

(1)
(2)
(3)
(4)

(5)

c.

[.o

Ohms
measurements
or

transistor

to

the FLJNCTION

will

move from

mark on

ZERO

short

pointer

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OHMS

enough

probe

the

this

resistance

Low-power

ON.condition:

the FLJNCTION

Set
Adjust

OHMS

the PROBE

Set
Connect

test lead
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short the

resistance,

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non-conducting

Minus
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the

SCR

ll{casurements.

of

this meter

the

voltage

waveforms

give

a

the

dB

RESISTANCES:

under test

po$ition,

be

measured

the

right hand

control

from

to exactly

that

function

to

cause diodes or

tip

when

Triggering

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control

anode.

good,

is

gate

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in"dicating that

voltage from

in solid state

junction

such

true

RMS reading for

scales can be

ranges, fuse replacement

To measure

and the RANGE

as close

switch is

the left hand

until neter

test leads

the

probe

the

in solid state

positive

is

checking

such

as semiconductors

SCR's can

this

switch to HI

so

meter

to

switch
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test

lead to

the

meter

lead

to
the

condition.

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circuits

can cause

NOTE

the

and

as

CAUTION

measurements

is disconnected.

placed

side

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pointer

and rotate

infinity

switch

components

of Inw-Power

be

checked to

check,

the

DIRECT

willcontinue

anode

the

SCR has

anode

OHMS function

charts in Figure

being

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those

encountered

the dB

for

used

resistance,

to the

transistors
with

OHMS

reads

the

when

an objectionable

relative

be sure that the

switch to the

center of

the

in

edge

of

the meter

meter.

rests

the

(o)

mark

is in the

circuits,

to

reqpect

which

and

see

proceed

and

full

scale

position.

cathode

lead.

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lead

of the

the forward

Figure

2 and

pure

is a

in music material

system to

level

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voltage is accidentally

may become necessary.

FIJNCTION

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range

meter

OHMS

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OHMS

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the

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as follows:

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on the right hand

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conduct.

to the

have

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if they

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RANGE

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strould read

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error.

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measurements.

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mark on ohms

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minus

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o.

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to the

together

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best

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read

gauge

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ohms

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resistance

wire).

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plus

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will be

controls

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and

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from the

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on the

the

meter

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to

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short

reads

l0 x 0.1

when

left

and

l0

=

I

e.

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for

used
resistance value.
changtrg
current

and should be

hand

accurate

MEASI,JRING

7.
the

a. Set

the

b. Set
c. Short

over zero mark

RANGE switch

d. Set

flowing
position
obtiined.

e.

f.

the

Turn

'which

lead

assembly

other side

the

Turn
pointer

indication
below the

Resistance

making

resistance reading

through

flow

fesistance indication.

AC CI.JRRENT:
FUNCTION
PROBE

leads together and

test

within

work down

and

power

you

wistr

to one side

of the circuit

power

deflection.

(nearest

mirror scale

of Thermistors:
accurate
If this measurement

the thermistor.

kept away

switch

to DIRECT.

switch

VOLTS/MA scale.

on

to the

the

circuit

the equipment

to

to measure

under

to the

Set

full

to

on the meter.

I.o OHMS

The

measurements

will result

to the AC A

rotate

desired

known, set

not

is

toward

current

of the circuit.

test.

equipment under

the RANGE switch

AC current

scale).

of resistances

is made

to heating caused

due

thermistor strould

The

from

any

position.

ZERO

control

range. If

the

under
flow. Connect

the approximate

the RAf.lGE switch

range

50pA

test OFF

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test

is

other

of thermistors

HI OHMS

the

in

heat to

until

until an

and

ground

the

the tip

ON and

to obtain

on the two

read

function strould

of low

function,

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pointer

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the

to

reading

ciicuit

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probe

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accurate

scales

red

higher

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rests

current

l.5A

to

meter

by the

not be

obtain

meter

value

accurate

open the

lead

of the

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the most

be

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CALIBRATION

Af.{D MAINTENATICE

The catbration, bias and balance adjustments have
accurately
unless components
turbed. If,

following

the

adjusted at the

have

for

any reason, recalibration becomes necessary,

procedures

CALIBRATTON OF THE

LOCATIONS):

To

necessary to remove

remove

cover,
(2)

screws at the
removed,
unit)

allowing

cover

back
must

be

the two

rear

tilt the bottom

the line

up and away

made

the order

in

BIAS ADJUSTMENT:
terminal
ZERO

Adjust

and common

control so

Bias adjustment

factory,

and

they

been replaced or these

as required.

(SEE

29O

gain

access to the

the

(2)

from

back

this

screws located at

near the top of the

part

of

the back cover

to slide through opening

cord

from the

top

portion

indicated below:

Connect an external

pointer

so

(foil

ground,

rests over

that external

ground

meter

(R53)

should

FTGURE
calibration

instrument. To

the bottom

cover. After the screws

of the

voltmeter between * meter

common

zero mark on

meter

carefully and

been

not require readjustment

adjustments

.

4

adjustments

have been dis-

carefully

FOR

ADJUSTMENT

perform

it

remove the

rear and the

have

and

front

(away

then

panel.

jack,

from

gently

Adjustments

etc.).

Set

outward

VOLTS/MA

reads

6.5 volts.

r,

,'

.ry

will

back

two

been

rear of

lift the

the

scale.

be

BIIS

AD'

AD''

R51

R53

Itr0
CAL

RI

.

(Racessed

Contrcl)

-DC

crL

CAL

R39

Figurc 4. Adiu$mcnt locotionr

fi)c

R45

CSIJ
R46

r

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