BRUEL & KJAER 2502 Instrucciones de funcionamiento

BROEL

KJ..€R

rum

-Denmark

Consisting

of:

Removal

the

Case.

Serv

Instructi

ons

Vibration

Meter

Circuit

Output

Amplifier

Function

Sele~tor

Position

Components

Parts List

Circuit

Diagram

2502.1

2502.2

2502.3

2502.4

2502.5

2502.6

2502

After

removing

the

four HEX/HD screws

the

front

panel,

possible

slide

the

chassis

and

the

front panel

out

the

rack

the

wooden

case.

The

metal

case

con

pulled

out

after

the

two screws on

the

bock

panel

hove

been

removed.

Block Diagram

Accelerot1on

Density~

Input

Acc

Oens..

Alt

Function

Meter

Selector Indication

l.F.

Cut-Off

Vibration

(Remote

lewl

{Remote

Centro!.

Controt

Potentiom.rters

from

generator)

Function

(R~Mnote

Control Selector from

fromLL.ll) {RernoteControl

geMrator

from

441

Trouble

Shooting.

(-Control

from

generator)

Output

Control

S1gnol

Output

the

reason

for a

fault

not

obvious

one

such as a

dead

tube

transistor,

broken

down

resistor,

blown or

disconnected

fuse

etc.,

then

first

test

the

voltages

all

the

tubes

and

compare

them

with

the

voltages

shown in

the

circuit

diagram

order

loca-

lize

the

defect.

Should this

method

finding

the

fault

prove

unsuccessful,

then

check

the

instrument by

adopting

the

method

de-

scri

bed

the

adjustment

procedure.

When the

troub

le has

been

found

and

remedied,

the

voltages

and

adjustments

which

ore

influ-

enced

the

remedy

must

rechecked.

The

tolerances

stated

the

instructions

can

only

used as a

guide

for

adjustment

and

control,.

but

any

deviations

must not

cor-

rected

without

being

sure

that

the

tolerances

the

instruments used for

making

the

adjustment

ore

so small as

have

influence

the

measurements.

The

instructions

in this Manual

ore

given

purely

as a

guide

the

service

equipment

with

minor

faults.

Some

faults,

as f.

inst.

small

deviations

tolerances

require

for

their

correction

special

control

equipment

and

extensive

erience,

and

these

cases

necessary

to send the

instrument

the

factory.

Spore P

orts.

lease

state

type

and

seria

l number

apparatus

when

spa

ports

are

ordered.

Instruments

Necessary

for

Service

and

Repair:

uency

Analyzer

type 21

(

ectronic

Voltmeter

type

2409)

Oscil

oscope

Bea t F

requency

Osci

oscope

type 1013

eat

requency

Osc

loscope

type

101

requency

Counter

timeter

(50

IJA)

2502

3.67

BROEL

KJJ£R

Ncerum

Denmark

Mechanical

Zero-paint

METER

TIME

CONSTANT

"Off"

2. Electrical

Zero-paint

METER

TIME

CONSTANT:

sec."

1.3.

Sensitivity

METER

TIME

CONSTANT:

sec."

ance

METER

TIME

CONSTANT:

sec . "

2502 .1 - 3 .67

M .

eter

Circuit

2502.1

alid

from

serial

no.

172571

Adjust meter

scale

for

0 .

Connect

pin 7

"Vibration

Level

Potentiometer"

socket

to ground .

Check

that

the

painter

still

0 .

Tolerance:

painter

"width"

Vibration Level

Potentiometers

V 1

removed.

(00000)

2512

Frequency:

1000Hz.

Adjust input signal for full

scale

deflection

type2502

Input

voltage:

Appro

9 V.

V 1

removed.

Frequency:

1000Hz.

Adjust input vo

ltage

for

full

scale

deflect

ion on type

2502,

Measure

the

voltage

across R 135

and

R 1

36.

Approx. : 9

max.

fference:

3 dB.

(located

printed

circuit

0258)

continued

. Frequency Response

METER

TIME

CONSTANT:

sec."

.6.

Overload

MEtER

TIME

CONSTANT:

"!Osee

. "

1.7.

DCAmplifier

METER

TIME

CONSTANT:

sec."

.8.

Meter

Time Con.stdh.t

METER

TIME

CONSTANT:

"30

sec.

.9.

Ripple

V 1 removed .

Frequency :

1000Hz.

Adjust

input

vol

tage

foro

9,8

deflection

on type

2502.

Chec

the

frequency

response from 5

to 100 kHz .

Tolerance:

0,2

V. (+

tolerance

type

1013,

1017:0

dB)

necessary

adjust

100kHz

(locat

printed

cuit

0258)

V 1

removed.

Frequency:

1000Hz.

Input

voltoge:l2

abo

ve full

deflection

type

2502.

Chec

with

osci

lloscope

across R135

and

R136

that

the

signal

not

distort-

V 1

removed.

Frequency:

1000Hz.

Adjust

input

voltage

fdr full

scale

deflection

type

2502,

Measure

the

oltage

on "DC -

Output"

socket,

3:-6

Tolerance:

±2

% .

necessary

short-circuit

to ground

and

adjust

P7 for 0

Von

"DC

Out-

put"

sockei,

(C 47

located

printed

circuit

0258

arid P7

0226)

V 1

removed.

Frequency:

1000Hz

. Adjust

input

voltage

far a

deflection

type

2502.

The

meter

time

constant

means

the

time it

takes

the

meter

pointer

to fall from

V to

3,5

when

the

input

signal

disconnected.

pcjslti~n

"30

sec"

the

meier

time

constant

should

sec.

Cfieck

METER

tiME

CONSTANT

position

0;3

-1-3-10

sec.

METER

TIME

CONSTANT:

"Ali

positions

moved.

except0,3sec,"

Frequency:

1000Hz.

Adjust

input

voltage

far full

scale

deflection

type

2502,

MedSure

the

ripple

on pin 3

"DC

Output"

socket

me.:ms

voltmeter

type

2409

tolerance

Max.

1 mV.

b .

METER

TIME

CONSTANT:

"0,3

sec."

item a .

Tolerance

: Ma

5 mV.

2502 .1 - 3.67

BROEL

KJJER

Nc:srum

Denmark

Ou~put

Amplifier

2502.2

2.1

Sensiti

;0i

:•!·

·:

.~;~•

1013

(1017)

METER

TlME

CONSTANT:

sec."

FUNCTION

SELECTOR:

"Ext.

Eilter"

alid

from ser

ial

. 1

7257

Ext

3 o

J.O

o 5

Fitter

6 0 0 7

2502

Frequenc

500

Hz .

Adjust

inp

ltage

foro

deflection

2502.

The

input

oltage

should

appro

x .

mV.

1013

p 10

2.2.

Acceleration

Density

METER

TIME

CONSTANT:

sec . "

FUNCTION

SELECTOR:

"Ace.

ACCEL. DENS

RANG

"0,0

2502.2

Le 1e

Pote

r1t1om

eters

Input

signa

100

mV,

500

Hz .

eflection

type

2502:

Full

scale

(<'0

dB)

necessary

adjust

continued

Frequenc

Res

ponse

METER

TIME

CONSTANT:"!

sec."

FUNCTION

SELECTOR:

"Ace.

Den

ACCEL. DENSITY

RANGE:

"100"

ACCEL. DENSITY RANGE

"0,01"

2.4

Overloading

FUNCTION

SELECTOR:

"Ace.

Den."

2 .5 .

ACOutput

FUNCTION

SELECTOR:

"Acc.Den

. "

LEVEL

BELOW

CROSS-OVER:

ACCEL. DENSITY

RANGE:

BELOW

CROSS-O

"10"

ABOVE

CROSS-O

"0"

ABOVE

CROSS-O

.6.

Noise

and H

FUNCTION

SELECTOR:

"Ace.

en."

ACCEL. DENSITY

RANGE:

"100"

2502.2

- 3 .

Input

signal:

10 V, 1

000

Hz.

Deflection

type

2502:100

cps

Check

frequency

response

from 10 -

100.000

Hz.

Toler

ance:±

cessa

change

alue

C 79

(located

printed

circuit

0258)

Input

signal:

100

mV,

1000Hz.

Deflection

type

2502:

cps

Che

the

frequency

ponse

again::!:" 2

necessa

adjust

P 5

100kHz.

(located

printed

circuit

0258)

Input

frequency:

1000Hz.

Connect

oscilloscope

"Vibration

Level

Potentiometer"

socket

pin 3,

and

check

that

the

signal

not

distorted

until12dB

obove

full

scale

deflection

type

2502

Monitor

Frequency:

1000Hz.

Adjust

the

input

voltage

for

Von

"Vibration

Level

Potentiometer"

socket

3 .

The v

oltage

"Monitor"

socket

should

The

output

"Control

Signal

Output"

socket

pin 1 should

max.

be-

low

Output

voltage

"Control Signal

Output":

22-26

below

Connect

shorting

link

"Cross-over"

socket

between

and

6 in

order

energize

relay

16.

Output

"Cont

rol

Signal

Output"

socket

pin 1

should

below

10 v.

put

vol

loge

"Control

Signal

Output":

22-26

belo

w 10 V

The

instrument

must

in its

case

or in

another

effectively

screened.

Disconnect

sign

put

and

check

noise

and

hum

"Vibration

vel

otentiometer"

ocke

Max . 10 mV.

BRO

EL &

KJ.ER

Ncsrum -Denmark

~·:

:~:i:

.~~

=·!·:i:~!-

·'•~;~•

:·

1022

3.1.

Sensitivity Control

Function

Selector

valid

from serial

no.

172571

1022

Ace. Gen.

Input

Relay

Control

Cross-over

1022-

2502

Relay

Control

2502.3

2502--.1025

Relay

Control

METER

TIME

CONSTANT:

sec . " The 2502's meter should read the v

alues

given in the

table

(within 4% ) under

the

stated

conditions

METER

INDICATOR: "RMS"

Input to

ACC.GEN.

Relay Control

energized

on pins

Accel.

Grad

Vel.

in/sec.

Displ.

inches

Auto

D-A

Auto

V-A

Auto"

A-G

2502.3

3.67

It will be necessary to

select

suitable

settings

the four RANGE

selectors

according

the meter

readings.

Readings in

the

3 programmed "AUTO" positions

FUNCTION

SELECTOR

de-

pends on

whether

or not

the

cross-over

rela

are

energized

via

pin 1

"Relay

Control".

a type

1008, 1019,

1025 or

1040-1042

used,

the "Relay

Control"

will

energized

automatically.

a type 1022

013

and

1017)

used,

the

- 6 V

can

be taken

from

pin 3

the

"Crass-over"

socket

type

2502.

10Hz

40Hz

125Hz

500Hz

2000Hz

8000

100

1 v

52)

52) 52)

3 3 3

2 2 2

10 10

100

1,26

0,63

3,57

1,78

0,893

0,447

61,6

15,4

49,2

12,3

3,1

0,98

,0613

0,0627

0,00392

-·~-

0,0627

100

in g - -

49,2

100

in/sec.

100

3,57

gfs&.

Notes:

1) 6 V

negative

with

respect

to pin

2) Energizing these pins should suppress

low-frequency

noise from

the

generator

but should not

affect

the

sensitivity

the

signal

frequen-

cy.

If the

sensitivities

are

rong,

make

the

following adjustments .

After

each

adjustment

check

the values

given

the

table.

continued

3.2.

Acceleration

Sensitivity

Adj.

ACCEL.

RANGE:

"100"

METER

TIME

CONSTANT:

sec."

METER

INDICATION:

"RMS"

FUNCTION

SELECTOR:

"Acceleration"

METER

INDICATION

"A.V.

peak"

3.3.

Displacement

Sensitivity

Adj.

DISPLACEMENT

RANGE:

"fJ.Ol"

METER

TIME

CONSTANT:

sec."

METER

INDICATION:

"RMS"

FUNCTION

SELECTOR:

"Displacement"

METER

INDICA

peak-peak"

DISPLACEMENT RANGE

"1"

METER

INDICATION

"RMS"

3.4.

Rangex10

ACCEL.

RANGE:

"100"

METER

TIME

CONSTANT:

sec."

METER

INDICATION:

"RMS"

FUNCTION

SELECTOR:

"Acceleration"

FUNCTION

SELECTOR to

"Auto"

ACCEL.

RANGE

"10"

3.5.

Noise

and

Hum

2502.3

3.67

Frequency:

500Hz.

Adjust

the

input

voltage

exactly

recommended

use

electronic

counter

monitor

the

test

frequency.

Adjust P 3 for a

100

deflection.

(located

printed

circuit

0258)

Adjust

the

input

voltage

for a

deflection

type

2502.

Adjust P 2 for a

deflection.

(loco

ted

printed

circuit

0258)

Input

frequency:

500Hz.

Input

voltage

exactly

2.55

Connect

"Relay

Control"

pin 4

ground

and

pin 5

-6

Von

"Cross-over"

pin 3 in

order

energize

for a

better

low

frequency

stability.

Adjust P 4 (on ;>ri;1ted

circuit

0258)

for full

scale

deflection.

Adjust the

input

voltage

for a

deflection

type

2502.

The

deflection

should

now

dB.

Remove

connection

Cross-over"

socket

Input

frequency:

5Hz.

Input

voltage

exactly

25.5

mV.

Adjust P 1 to 4%

below

full

scale

deflection.

Input

signal:

1 V,

500

Deflection

type

2502:

dB.

Connect

"Remote

Function

Selector"

4 to

ground

and

pins 2

and

7 to

-6

"Cross-over"

3 in

order

energize

-Range x

Relay 0 1

Deflection

type

2502:20

dB.

Type 2502 must

in its

case

other

way

effectively

screened.

Measured

"Vibration

Level

Potentiometer"

socket

3 in

the

frequency

range

20-40000

Switches

all

positions .

Max.

noise

and

hum:

mV.

BROEL &

KJJER

Ncerum -Denmark

+250V

6,3V

-6V

+ 250 v

C11

c 26

Position

Components

val id from

serial

no.

172571

Control

Signal

Output

pin 1

+250V

Vibration Level

Potentiometers

pin 2 pin 3 6,3VtV

C11

2502.4

'--

---------

-----~

Ground -6V Ext. Filter 0

0258

2502.4 -3,67

025

025 025

025

025 025 -30V

pin3

C47

V17e

Ace.

Density

Input

021

Ground

-6V

Ace.

Gen.

Input

Ground

2502.4

Ground

+ 250 v

V"V

C10

DC·

0258

Output

0226

0380

V11c

Ground C5 Ground

V11

--1

Ground

vrv

~(tQ

30V

R181.

0258

;...._

--+-- - c10

'--

---

-c

L..+-

- -

---

c10

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