B&K 1606 Instructions And Applications

Vibration Pick-up Preamplifier Type

To

be

used

in
accelerometers
urement

of
ment.
Built-in

shaker

measuri11g

arrangement.

combination

and

indicating

acceleration,

table

for

with

instruments.

velocity

calibration

and

the

of

displace-

complete

1606

B & K

Meas-

Ncerum,

EIB

160!)

Denmark

. ~ 80

05 00

. ~ BRUKJA,

Copenhagen

. Telex:

5316

Vibration Pick-up Preamplifier

Type 1606

Reprint

March

1967

Contents.

Description

General
Amplifier

Integrating

Built-in

Operation

Measuring
CaHbration
Adjustment
l\feasurement

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Amplification
Distortion
Lower

Frequency

Limiting

Networks

Shaker

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

Arrangement

of
to

Acceleration
Velocity
Displacement

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

Specifications

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

and

Table

Frequency

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Dynamic

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Ranges

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

10

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

Measuring
the

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

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

System

Vibration

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

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Signal

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

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

10

14
15
15

17

General.

The

Vibration

tion

measuring
Accelerometers
Analyzer
Amplifier

Type

Type

Pick-up

systems

2107, Audio

2603.

and

Preamplifier

and

the

Description.

Type

constitutes

appropriate

Frequency

Sensitivity
Adjustment

an

measuring

Spectrometer

1606 is

important

designed

link

amplifier,

Type

2112

for

use

between

e.g.

or

in

vibra-

the

B & K

Frequency

Microphone

Input

Fig.

The

Preamplifier

ing

networks
impedance
of

the

accelerometer.
employed,
built-in
the
tional
built-in
at

•) G equals

integrating

Accelerometer

to

shaker

an

acceleration

Capacitive
Attenuator

~

1.

Block

mainly

and a built-in

of

the

amplifier

measurements

the

velocity

table

the

acceleration

Shaker

Table

diagram

consists

For

can

networks,

can

readily

or

displacement

allows

level

of

obtained

+

Amplifier

>

of

Preamplifier

of a two-stage
shaker
is

made

example

be

made

the

acceleration

be

the

complete

1 G

*).

by

Amplitude

Adjustment

table

for

high

to

when

down

converted

of

the

measuring

Both

filament 'and

the

gravitational

Integ rating

Networks

~

AC

100-2J.OV

with

built-in

amplifier,

calibration

ensure a low

the

B & K

to

2 Hz (c/s).

dependent
into a signal
object

under

set-up

force of

--.2603

mains

261186

shaker

a set

purposes.

cut-off

Accelerometers

By

selecting

signal

derived

which

investigation.

to

be

plate

voltages

attraction

To

Type

2107,2112,

or

table.

of

integrat-

The

input

frequency

various

from

is

propor-

calibrated

for

of

the

eartll

2801

are

The

the

3

two-stage
Amplifier

amplifier
employed

Amplifier.

A

variable
attenuate
stage
continuously
resistance
sensitivity

Amplification. By

the

amount
amount
quency
is

in

the

lowest
amplification,
can

capacitive

the

amplifying

measured

setting,

of

of

negative

characteristic

position

value

be

seen

input

variable

amplification

"0"

is

position

in

Fig. 2

are

as

attenuator

signal

circuit.

sensitivity

from

and

means

feedback

to a certain

the

negative

obtained

where

supplied

the

indicating

by

This

is

as

of

can

when

"10".

via a 7-cored

in

40

or

circuit

control

the

terminal

high

as

the

continuously

be

is

also

extent.

feedback

the

The

influence

the

response

cable

instrument.

the

input

circuit

80 dB,

before

contains a double

in

the

feedback

"Input"

200

M.Q.

variable

regulated.

changed,

When

will

However,

therefore

the

reach

Preamplifier

on

the

is

reproduced

from

makes

it

is

applied

triode

circuit.

is

independent

sensitivity

at

the

influencing

"Sensitivity

its

highest

is

adjusted

frequency

for

the

Analyzer

if

possible

to

the

which

The

same

time

Adjustment"

value,

for

maximum

characteristic

three

different

two-

has

input

of

control

the

fre-

while

or

to

a

the

the

db

./'l~

Odb

/1

·2'

~

.:

v/

•38~

/'Odb

20

0.1 0.2 0.5

--.Frequency

Fig. 2.

Typical

"0

dB"

, "+ 20

the

amplification

indicated

full

(a)

The

two

with

capacity

with

capacity

to a

(b)

4

lower

The

three

sion

Cable

Extension

by

"0 to +

100m.

I

ype

y

~

1606

//

~

,,___

'

I I

-

~

~

ccelerometor

;;:--

• Type

(400 pF)

1606

--

'/

I

/•38di

5

10

(a)

frequency

dB

",

"+ 30

set

by

by

"Type

dotted

curves

400

pF

1ooo

pF

frequency.

full-line

has

curves

been

Cables are used,

20 dB" is also valid for lengths

20

response

dB"

of

and

"Sensitivity

1606" are valid for

instrument.

show

and

the

Preamplifier.

and

Preamplifier

are

used

between

valid

dotted

-

db

15

Preamplifier

"+ 38

dB"

Adjustment".

response

By
the

for

the

Preamplifier

curves

when

marked

The

the

Preamplifier

of

combination

combination

cut-off

Preamplifier

are valid.

of

Extension

10

(b)

set

to
on
three

"Acceleration".

the

curves,

curves

of

frequency

when

and

indicator.

The

curve

I I I

0; 3; 10;30cnd llO m

Extension

Coble

~

20

50

100

KC/s

Ulf81

refer

to

drawn

in

as a separate

Accelerometer
Accelerometer

corresponds

no

Exten-

When

indicated

Cables

up

to

200

values

of

gain,

be

achieved
"Attenuator"
and

the

integration

viz. 0, 20

is

approximately

in

position

switch

and

"1",

38 dB.

in

position

38

db

the

"Sensitivity

The

maximum

and

is

obtained
Adjustment"

"Acceleration".

amplification

with

the

in

which

capacitive

position

can

"10"

Distortion.

two-stage
"Acceleration",
can

be

output

Fig.

3.
maximum
20

kHz

The

amplifier,

seen

peak

Typical

amplification. The

(kc/s)

maximum

is

also

from

voltage

r----

- -

0

- -

~2

z

......-::::::

r

0

--.__..Voltage

nonlinear

and

without

i.e.

dependent

Fig. 3,

of

the

~v

____..

5

(pas .

output

from

where a typical

Preamplifier

Minimum

amplification/

(Odb)

voltage

the

output

on

-

------

- - - Maximum I

I

I I

I

I

~

k

10

15

on

output

of

..

Acceleration

distortion

curves

Extension

Preamplifier

'')

are valid for

Cable

instrument.

the

20

of

which

of

the

amount

nonlinear

when

in

-

~

amplification

(+3Bdb)

I

/

25

the

Preamplifier

between

can

be

supplied

Preamplifier

of

negative

distortion

position

I

when

feedback.

"Acceleration"

I

30

Volt peak

the

Preamplifier

35

.2&1188

at

frequencies 20 Hz ( c/s)-

mmzmum

and

from

set

versus

indicator

the
for

This

the

is

and

illustrated.
minimum
maximum,
imately
maximum
tion"
Preamplifier
Analyzer
Thus
dotted

20 Volts

condition. When

the

the

maximum

lines

In

order

amplification

this

output

peak

oulput

voltage

and

the

capacity

(3

m,

10 m, 30

to

avoid

(0 dB)

voltage

respectively.

vs.

frequency

employing

following

of

these

output

voltage

m,

distortion

and

should

not

Refer

extension

Microphone

cables

loads

has

and

100 m)

higher

higher

exceed

also

is

given

cables

the

to

in

than

Fig

when

Ampl!fier,

amplifier

be

lowered

Fig.

than

approximately

approximately

10

Volts

. 4,

where

used

between

4.

peak

the

Preamplifier's

in

the

the

output

Spectrometer

in

tl)e

as

indicated

1 %

at

3 ,%

at

and

approx-

"Accelera-

of

the

or

Preamplifier.

by

the

5

Ypoak

20

15

t-

-+---+--+--+--+-~

10

t-

-+---+--t-

Distortion J•k opprox.

Maximum omplif.ication. 'T

0~-+---+--+--+---+--~~---+-~~~

0.1 0.2 0.5

Fig.

4.

Maximum

"Acceleration".

between

(a)

Preamplifier

For

"Sensitivity

amplifier

the

order

(b)

For

"Sensitivity

amplifier

output

voltage is as

Lower

Limiting

intended

a

capacitor

input

of

responses

resistance

the

combination

for

at
Accelerometer
set

respectively

--

-_-,-,

' ,

-+--.:...1----.

,;;,

100

(a)

peak

Full-line

Adju$tment"

stage)

the

of

3 %

when

Adjustment"

stage)

the

Frequency.

use

with

which

is

in

of

the

Accelerometer

the

lower

Sets

having

for

minimum

-.......,_

l.

r--:

''--:--

',

\~,m

c-,

!---"''

'

20

ExJnslon

"\

C.bl~

~

-t-

-"\

<+---1

~

-1----1

50

100

'',

'\''

,,t-'-'.,'

\ 10rrt\ ' ,

JO~

',,

10

voltage

curves are

and

indicator.

Extension

in

:nonlinear

output

nonlinear

high

as

given

The

the

Preamplifier,

series

with

Preamplifier

frequencies

400

pF

and

-

200

KC/s

from

output

valid

when

Dott

ed lines valid for various

Distortion
Minimum amplification

0.5

of

Preamplifier

no

Cable.

position

distortion

"10"

from

(maximum

the

voltage is as l1igh as

in

position

distortion

by

output

the

determines

plus

are

internal

maximum

"0"

will

the

curves.

impedance

can

be

signal

source.

the

Preamplifier.

shown.

capacitance,

amplification.

(minimum

be

in

approximately

The

1•k

opprox.

(b)

Extension

Preamplifier

given

the

order

of

the

Due

to

this

lower

limiting

In

Fig. 2 the

curves

with

the

No

Extensi

on

L Coblo

50

100

20

when

Cable is

KC/s

261169

set to

used

lengths

amplification

will

by

the

be ·in

curves.

amplification

of

1 %

when

Accelerometers,

equalized

capacity

frequency
frequency

are

valid

Preamplifier

200

of

of

of

by

the

for

Integrating

The

output

Employing

Networks.

from

the

the

different
also' as a measurement
B & K

Accelerometers
amplifier
Accelerometer

switch

tion

will

point

Design.

quantities,
magnitude

6

of

with

now

where

is

switched

is

the

Preamplifier

respect

be

proportional

the

When

periodic

acceleration,

of

the

integrated

to

time

Accelerometer

remaining

amplifier

networks

of

in

combination

for

set

takes

to

vibrations

velocity

circuit

vibration

velocity

velocity

once

with

to

position

place,

the

displacement

is

mounted.

two

quantities

can

be

or

displacement,

with

measurements,

respect

"Displacement" a further

and

the

are

considered,

or

displacement

fed

to

the

measurements

the

Preamplifier.

the

to

time.

output

from

of

the

vibrating

and

one

is

will

depend

integrating

can

be

by

using

When

output

With

the

the

of

the

kept

constant,

upon

the

networks.

carried

one

the

from

of

out

the

Pre-

the

integration

integra­Preamplifi'er
body,

at

the

··

mechanical

the

frequency

of

the

vibrations.

quantity.

If

the

acceleration

and

the

Generally
an

indicating

carried

0

displacement:

speaking,

out

This

is

readily

is

given

v =

adt

the

magnitude

instrument

as a measurement

will

as

('

J

a =

=-

vdt

of

seen

Ao

sin

~Ao

cos

w

=-

of

therefore

acceleration.

from

(wt)

{wt) + c1,

Ao

sin

w2

the

electrical

be grea

the

derivation

the

velocity

(wt) + c2,

tes t

will

Cl

= 0

quantity

if

the

of

the

respective

be:

C2 = 0

measured

measurement

on

is

db

'

-10

-20

-30

§

-40

~

c

:;;,

c

~

~-50

Lo

1 2 5

~Frequency

Fig. 5.

The
measurements
with
un'derstand
work

The

Amplitude

electrical

the

Preamplifier,

should

voltage

attenuation,

are

what

actually

be

considered,

across

10

versus

carried

can

the

capacitor

20

frequency

which

takes

out

employing

be

seen

happens

see

Fig.

is

ec = C

100

50

200

characteristics

place

an

from

the

the

basic

6.

given

by:

1 -

~

idt

1000

500

of

when

velocity

accelerometer

curves

diagram

of

of

2000

C/s

integrating

or

displacement

in

Fig.

5.

an

integrating

5000 10000

f!i8038

networks.

conjunction

To

better

net-

7

and

the

total

input

To

obtain a correct

that

ex'>>

ec,

and

above,

gives

A

specific

limited

combination

frequency

Fig.

the

capacitor
sequently
longer
the

desired
are

used,
for

"Velocity",
Frequency

their

low-frequency

tion

switch
indicated
still

takes

might

be

(a)

Measurement

If

the
tion
measured,
on
quency
In

q~ency

0.316%.

(b) Measurement

Setting

300

be

too

fulfilled,

frequency

which

and

is

with

place.

illustrative:

deflection

of a pure

the

Preamplifier
30

case

the

3

the

Hz

( c/s)

decreases

whereas

for

the

the

Hz

Hz

voltage

integration

consequently

range,

6.

Basic diagram

low. At

which

means

range

can

also

Dynamic

cut-off

the

different

lowest

Application

of

Velocity:

on

sinusoidal

deflection

(c/s)

".

switch

(cis)"

of

Displacement:

switch

to

",

results

is:

e = ex + ec = Ri + C J

the

values

of R and C must

e

i N

R,

which,

00

ec

R~

~edt

of a resistor

as

for

to a

too

the

low

that

various

be

seen

three

Ranges.

(indicated

frequency

of

the

voltmeter

on

is

set

is

set

the

deflection

position

in a meter

and a capacitor

the

high

frequencies,

of

an integrating

low

value,

frequencies

the

integration

combinations

from

Fig.

are

used

for

"Displacement".

As

the

networks

on

the

positions,

the

vibration

the

to

to

position

"Displacement -Lower

where

at

which

curves

of

is

taken

with a frequency

meter

will

position

on

the

deflection

1

\'

idt

substituted

can

only

the

signal

J611PD

network.

the

signal-noise

the

requirement

will

be

incorrect.

of

resistors

5.

Two

combinations

cannot

curves

Fig. 5

to

"Velocity-

"Velocity -Lower

in

the

networks

practically

to a numerical

be

100 %

be

3.16

indicating

of

approximately

Fig.

correct

when

of

%,

Lower

meter

Limiting

be

chosen

in

the

be

level

ratio
en>>

and

be

used

5),

the

are

integration

the

500 Hz ( c/

when

the

Limiting

Limiting

will

Freque:acy

sucb

equation

used

in

across

will

con-

ec is

no

To

cover

capacitors

are

used

below

integra-

inserted,

example

accelera-

s)

switch

Fre-

Fre-

only

be

10

%,

but

a

'

is

8

this

indication

By

changing

30

Hz

( c/s)

meter

will
creasing
"

Displacement

tion

should

hum

level

From

the

above

a

measuring

This

is

especially

velocity

•

of
permissible
most
The

w-

or

the

integration

satisfactory

time

2

and

10-

deflection

constants,

will

over

", a more acc

only

the

sensitivity

-Lower

be

o.001 %,

may

here

it

can

point

of

true

switch

Lower

Limiting

result.

3,

which

be

to

be

be

view,

are

RC,
can

slightly

position

o.1

cause

seen

at

required,

on

for
be

inaccurate due

"Displacement-

urate

res

ult

%.

(An

accurate

of

the

indicating

Limiting Frequency 3 Hz

but

for

mod

serious

that

vib1 a

be

carried

higher

frequencies.
care

the

Preamplifier.

Frequency

the

different

seen

from

is

obtained, but

reading

era

te

acceleration

errors

in

lion

measurements

out

as

must

be

position

networks

the

curves

to

the bending

Lower

Limiting

the

can

instrument).

( c/

s)"

levels the

the

measured

measurements

When

measurements

taken

regarding

It

is

obvious

of

the

switch

are

shown

defl e

be

obtained

If

is u se d,

results

should,

of

that

chosen

in

Fig

of

the

curve

Frequency

ction

on
by

the

position

the

indica-

noise

.

also

from

acceleration

of

the

position

the

highest

will

give

to

be

10-

. 5.

the

in-

and

the

the

.

.

1

,

Built-in Shaker Table.

A

sketch

of

the
tremely
a
magnetic
By
table
way
vibrations
electromagnetic
at
this

simple

stretched

varying

can

almost

three

points,

sphere

metal

system

the

be

pure

can

just

shaker

principle

fed

tension

adjusted

be

exciter.

is

commences

table

of

strip,

from

of

to

the

sinusoidal

adjusted

To

built

into

is

operation.

and

the

the

mains

the

frequency

vibrations

by

determine

the

to

rattle

shown

vibrator

metal

varying

hollow

the

in

The

supply.

strip

of

the

are

the

this

axis

peak

Fig.

7,

which

moving

is

excited

the

resonance

power

obtained.

voltage

level a

of

the

shaker

acceleration

illustrates

element

by a small

frequency

supply

The

amplitude

across

small

sphere, supported

table,

of

is

suspended

voltage.

the

coil

Fig.

the

table

the

electro-

of

In

of

of

7.

When

is

ex-

on

th_.

this

tile

the

1 G .

•

•

Fig.

7.

Illustration

of

mechanical

system

of

built-in

shaker

table.

9

Attenuot

ion

Sensitivity

Adjustment

Resonance
Adjustment

Fig.

8.

Front

plate

Measuting Arrangement.

The

Preamplifier

indicating

(1)

12)

(3)

(4)

Measuring
instruments
desired,

the
Recorder
meter

Type

Type

2305 is

out

automatically

There

are

(1)

The

measuring

measuring

instruments:

Audio
Frequency

Microphone
Microphone

2409

Type

should

Frequency

or

similar

arrangements

are

shown

above

mentioned

2305. A

2112

or

Analyzer

that

an

on

two

possible

arrangement

point.

be

Analyzer

Amplifier

Power

indicating

illustrating

in

Fig. 9.

great

analysis

preprinted,

methods

Operation

I

ntegrotion

1606

view

of

Vibration

used

in

conjunction

Spectrometer

Type

2107

Type

2603

Supply

advantage

Type
instrument.

the

When a recording

instruments

which

2107

in

conjunction

of

the

vibrations

frequency

of

connecting

is

placed

Type

2801 +

means

can

calibrated

in

.

Switc

Pick-up

with

2112

Electronic

of

connection

be

is

gained

with

investigated

the

instruments:

the

immediate

Preamplifier.

one

of

of

the

measurements

connected

by

using

the

recording

-poled

the

following

Voltmeter

to

the

to

the

the

Spectro-

Level

Recorder

can

be

paper.

vicinity

plug

Type

various

Level

carried

of

the

is

•

f

•

10

Fig.

9.

vibrations.

The

connected

panel

instrument
Typical
under

(

2)

The
measuring

The
by
Type
together.

:i : @

~•=

@

@

lii

Complete

measuring

seven-cored

Extension

measuring

The

four

seven-pin plug

to

of

Type

should

frequency

the

above

point.

Cables

AO

0029 (30

The

•

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:::

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i

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2803

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arrangements

different

the

input

2107, 2112

likewise

characteristics

condition

arrangement

measuring

m).

influence

of

marked

Type

Several

upon

instruments

the

Preamplifier meas

or

2603.

be

set

are

shown

is

cable

AO

0027

lengths

the

n

for

the

are

"Condenser

The

input

to

position

of

the

measuring

in

Fig.

placed

some

from

the

(length 3 m),

of

Extension

frequency

1808

~~~ -~_-:f

~

I,U,

i

~··

!e!

2112

measurement

the

indicating

uring cable

Microphone"

switch

"Condenser

arrangements

10.
distance

Preamplifier

Type

AO

Cables

response

at

m,IY

•

:::-.-:::

§ _ ,;•,

,,

·

of

apparatuses

on

of

the

Microphone".

away

can

be
0028
can

the

mechanical

should

be

higher

.

be

the

front

indicating

used

from

the

extended

(10

m)

or

coupled

fre-

11

db

~

Accelerometer

O~b

0

,~~

//

~

I I

~

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i

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(1000pF)

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pF)

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tl

+20~b

-

~

+38 db

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'

20

1

----.

Fig.

10

illustrated
complete

.

Typical

set-up

5

Frequency

in
high frequencies
The

indication

to

the

position

quencies
Cables

NOTE:

Calibration

To

calibrate

used.

When

ment",

worth

NOTE:

Thereafter

screwed

amplifier.

1.

Connect

NOTE:

2.

Set

of

can

The

amplifier

of

the

the

the

Accelerometer

screw.

The

Accelerometer

in the

the

on

the

By

following

the

The

ages
adjustment.

the

control
"Attenuation"
"Sensitivity
Integration

10

2

amplitude

Fig. 9.

At

including

the

curves

for

the
"0 dB",
of

"Sensitivity

the

measuring

be

seen

measuring

should,

the

Measuring System.

measuring

set-up

manu

al

measuring

Accelerometer

Preamplifier

Preamplifier

between

knobs

on

Adjustment"

Switch

versus frequency response

the

low

frequencies tl1e curves are

Accelerometer, Preamplifier

illustrate the response

Preamplifier

"+

30 dB"

Adjustment"

amplifications

set-up

from

the

cable

if

arrangement

is

connected

could

can

also

for the

cable

this

sequence

100 V and

of

the

"1"

on

Accelerometers.

to

(shaker

"Acceleration"

plus

and

"0

stated thereby.

employing

dotted

curves

connecting

possible,

as

described

be

screwed

be

mounted

from

and

connected

twisting

the

mains.

table)

240 V (50

Preamplifier

on

"0",

indicator only.

dB

when

not

the

Accelerometer

and

without

to +

20

the

various

in

Fig. 2b.

the

Accelerometer

be

extended.

built-in

under

onto

the

by

other

to

of

the

can

be

or

as

follows:

.

104 2

of

the

and

Indicator.

Accelerometer, i.e .

dB"

on the curves

amplifier

lengths

shaker

"Measuring

table

by

means

to

Preamplifier

the

"Input"

cable

is

driven

from

60Hz

(c/s))

C/5

5

.?61193

combinations

valid

for

At

stage gives

of

Extension

to

the

table

can

Arrange

a lfs"

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as

explained

of

the

avoided.

mains

without

10

the
the

refer

the

Pre

be

is

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volt-

any

5

-

-

12

3.

The

Microphone

"

Function

"Meter

"Meter

4.

By

turning

deflection

the

"Sensitivity

to

in

item

5. A maximum
shaker

"Resonance
adjustment

6.

Adjust
so
point

table

NOTE:

The
accurat
the

output

of

the

shaker

the

that

the

where

is

condition

e dete

"Recorder"

sphere

table

Selector"
Switch"
Range"

the

"Amplitude

of

the

indicating

Adjustment"

2).

deflection

table

suspension)

Adjustment"

the

"Amplitude

amplitude

built-in

the

rattling

equal

to the

If

the

sphere

"Amplitude

be

placed

this

manner
increased.
The

vibration

by

the

touching

when

checking

released

where

.

the

rmination

sets

in

vibration

Amplifier,

on "Linear

on

"Peak"

and

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of

of

sphere

commences,

acceleration

cannot

Adjustment"

on a soft

the

vibration

of

of

the

rattling

a he

adphone

of

the

where

is

distorted

Spectromet

"Fast"

Multiplier"

Adjustment"

instrument

can

be

the

indicating

should

of

the

Adjustment"

the

shaker

is

brought

from the g

be

to

rubber

the

shaker

the

Preamplifier's

rattling

starts

or

associated

the

pure

.

er

or

Analyzer

"

for a sensitivity

of

should

adjusted

meter

be

achieved

Preamplifier.

may

table

by

to

the

beginning

the

peak

ravitation

made

to

maximum,

pad

or

similar

amplitude

table

is,

point,

the

is

readily

an

osc

illos

measuring

sine-wave

should

the

Preamplifier a small

be

obtained.

to a higher

pointer

by

During

be

readjusted.

"Amplitude

acceleration

rattle,

the

type

of

the

to

some

control

If

value

(resonance

turning

the

Adjustment"

of

rattling.

on

for

ce

of

even

Preamplifier

of

shaker

table

degree,

knobs,

Preamplifier

found

aurally.

cope can

be

connected

instrument.

signal

derived

be

set

of

100 mV.

necessary,

than

the

knob

resonance

At

the

shaker

the

earth.

by

turning

should

material.

will

affected

therefore

should

For a more

The

rattling

from

the

to:

set

of

the

In

be

,

be

to

Accelerometer

a.

The

sensitivity

the

deflection
"Sensitivity
measurements

NOTE:

Accelerometer

b.

The

sensitivity

the

deflection
"Sensitivity
measurements

with a Sensitivity

of

of

Adjustment"

full

An

unstable

amplifier

with a Sensitivity

of

of

its

Adjustment"

full

the

indicating

its

indicating

deflection

meter

on a soft

the

indicating

indicating

deflection

Higher

apparatus

meter

of

the

(1

V)

deflection

rubber

Lower

apparatus

meter

of

the

(o.l

V)

than

15 m V /G.

should .be

should

be

set

adjusted

Preamplifier. During

then

equals

looo

cm/sec2.

may

be

avoided

pad

or

similar

than

should

should

be

Preamplifier.

then

equals

15· m V /G.

.

be

set

adjusted

During

looo

by

to

"1

to o.98 V

the

placing

to

"100

to 98

the

cm/sec2.

V",

and

following

the

mV"

mV

by

following

the

Pre

and

the

by

-

13

After

calibration

the

power

NOTE:

Protect
apparatus
is

During

the
"Sensitivity
will

be

lost.

the

supply

is

the

by

dismounted.

following

Adjustment"

Accelerometer
disconnected
connection

removing

adjustment

should

from
cable
the

not

is

unscrewed

the

between

cable

and

be

from

Preamplifier.

Accelerometer

from

the

Accelerometer

measurement

altered,

otherwise

the

the

shaker

and

position

the

table,

and

indicating

before

this

of

the

calibration

Adjustment

1.

Mount

2.

Connect

3.

Set
ing
necessary,

by

to

the

Accelerometer

Accelerometer

indicating

meter

does

the

attenuating

"Attenuation".

4.

Select

RMS,

the

"Meter
Recorder
type

of

detection

Switch"

Type

apparatus.

l\leasurement.

I. ACCELERATION

Keep

Integration

1.

Accelerometer

The

value

Read

value

ation"

of

Example:

Meter

reading:

Position of

The

acceleration

2.

Accelerometer
Read

value

"Attenuation"

the

Vibration

apparatus

not
voltage
the

Average

2305

is

Switch

with

of

the

in

Volts

the

Preamplifier.

"Attenuation":

with

in

of

Signal.

on

the

to

"Input"

in

position

show a higher

can

be

brought

input

voltage

or

Peak

{half

on

the

indicating

is

used

for

selected

acceleration

o.4 V

will

Volts

the

by

on

"Acceleration".

Sensitivity

X 103 X

"102"

then

be: o.4 X 10' X

Sensitivity

X 103 X 10 X

Preamplifier

object

of

Preamplifier.
"Linear"
voltage

to

the

peak-to-peak)

recording

the

"Rectifier

Higher

in

cm/sec.2

the

value

Lower

.

to

be

investigated.

and

than

below

the

Preamplifier

apparatus.

the

results,

Response"

than

15 m V /G.

is

then

indicated

102

= 40ooo cm/sec

than

15

the

value

check

indicated

stated

with

type

If

achieved

by

mV/G.

indicated

that

peak

of

the

the

switch

switch

2

the

indicat-

in

Fig.

voltages

control

detection

B & K

appropriate

on

as

follows:

"Attenu

by

switch

4.

If

knob

by

Level

this

14

Example:

Read
The

value

and

acceleration

position

will

in

of '

Attenuation"

this

case be: o.4 X 10' X

are

as in

example

10 X 102

above.

= 400ooo cm/sec

2

•

II. VELOCITY

The

Integration

should
a. "

Velocity­quencies
30

Hz

b. "

Velocity-

quencies

(cis).

1.

Accelerometer

The

value

The

read

the

position

"Attenuation"

Example:

Read value:
Integration

"Atten~ation":

The

2.

Accelerometer
The

read

the

position

switch

Example:

Setting
The

Switch

be

used

as

stated

Lower

covered

(cis)

or

higher.

Lower

covered

with

of

the

velocity

value

in

Volts X

of

Integration

on

Preamplifier

o.04 V

Switch: "10 em/sec" ("30

velocity

"1"

is

then: o.04 X

with

value

in

Volts X

of

the

Integration

"Attenuation"

and

read

velocity will in

value as above in

should

below.

Limiting

by

the

vibration

Limiting

by

the

Sensitivity

in

em/sec.

the

10

Sensitivity

the

on

Preamplifier

this

case be: o.04 X

be

set

to

"Velocity".

Frequency

signal

Frequency

vibration

Higher

value

signal

than

is

derived

(10

Switch X the

.

ds")

X 1 = o.4 em/sec.

Lower

than

value

(10

Switch

X 10 X

.

item

1

).

10 X 10

3

Hz

are

within

30

Hz

are

15

m V /G.

as:

or

102 em/sec.)

value

15 m V /G.

or

102 em/sec.)

the

X 1 = 4 em/sec.

The

(c/s)"

(c/s)"

higher

indicated

value

two

positions

when
the

range 3 to

when

than

indicated

by

indicated
indicated

the

the

30

switch

fre-

fre

Hz

by

by
by

-

III.

DISPLACEMENT

The
The

a.

"Displacement­frequencies
30 Hz (c/s)

b.

"Displacement­frequencies

300

c.

"Displacement­frequencies

(cis).

1.

Accelerometer
Similar
in

em

Integration

three

possible

Hz (c/s)

to

the

is

derived

Switch

should

positions

Lower

covered

or

by

higher.

Lower

covered

or

by

higher.

Lower

covered

with

by

Sensitivity

measurements

from:

be

should

Limiting

the

vibration

Limiting

the

vibration

Limiting

the

vibration

Higher

previously

set

to

be

us~d

Frequency

Frequency

Frequency

than

position

when:

signal

signal

signal

15 mV/G.

described

"Displacement".

3

Hz

(cis)"

are

in

the

30

Hz (ci

s)"

are

in

the

300Hz

are

(cis)"

higher

the

than

displacement

when

range

when

range

when

30

300

the

3 to

the

to

the

Hz

15

2.

For

further

refer

the

Type

2tt2
addition,
meters

.

The

read

value
Integration
of

the

Preamplifier.

Example:

Read

value:

[ntcgration
"Attenuation"
The

amplitude

Accelerometer

The

amplitude

item

1.

above

by

tO.

Example:

The

settings

The

amplitude

details

instruction

or

the

Microphone

reference

in

Volts X the

Switch X the

o.t

Volt

Switch

on

"to-8 em"

on

"t"

will

then

with

Sensitivity

in

em

of

except

for

and

read

value

will

now

concerning

books

fo.r

should

be

made

value

value

be:

o.l X to-

Lower

the

vibration

the

fact

are

be:

o.l

X

the

operation

the

Analyzer

Amplifier

to

the

(tO,

indicated

1

X 1 = to-• em.

that

the

same

1

t0-

X 1 X

Type

instruction

than

signal

the

as

of
Type
2603,

to-t

by

result

in

10

or

the

15

m V /G.

is

example

=

to-1 em.

the

2t07,

as

books

to-a

em)

switch

derived

should

1 ).

indicating

the

the

case

for

indicated

"Attenuation"

as

stated

be

multiplied

apparatus,

Spectrometer

may

be.

the

Accelero

by

in

In

-

16

Frequency

Range:

Specification.

o.2

Hz (c/

s)

to

lOOooo

when

"Sensitivity

(min.

amplification).

2 Hz (c/

s)

to

20ooo

"Sensitivity

amplification).

Adjustment"

Hz

Adjustment"

Hz (c/

s)

(c/

s)

within

is

within

set

± o.5 dB

is

set

± 3 dB

to

"10" (max.

to

when

"0"

Amplification:

Input

Impedance:

Input

Attenuator:

Max.

Output

Hum

and

Noise

lntegration

Built-in

Power

Shaker

Supply:

Voltage:

Level:

Switch:

Table:

Maximum
set

200

"A

ttenuation":

of

In
20 V peak

10 V

12
amplification
disconnected

Allows

placement

tion.

Driven

sonance
of
tion
knob,
100

(c/s).

38

for

acceleration

M.Q

paralleled

± o.5 dB

condition

tion

"10"

peak

tion

"0"

t-tV

approx.

selection

by

with

the

knob

of

the

"Amplitude

to

240

when

when

dB

approx.

measurements.

by

Two

steps

re.

position

"Acceleration":

"Sensitivity

(max.

amplification).

"Sensitivity

(min.

amplification).

referred

and

with

from

the

of

acceleration,

measurements

the

mains

the

mains

"Resonance

shaker

Volts

table
Adjustment".

without

voltage

approx.

of

40 dB

"1

".

Adjustment"

Adjustment

to

"Input"

Preamplifier

mains.

of

the

voltage

frequency

Adjustment".

can

be

adjustment,

amplification

50

pF.

with

an

at

shaker

velocity

investigated

and

brought

by

adjustment

The

adjusted

by

50

when

accuracy

is

in

posi-

is

in

posi-

maximum

table

or

dis-

vibra-

in

accelera-

another

or

60

re-

Hz

17

Measuring

Ranges:

Depending
sponse
measuring
consisting
dicating
meter

of

or

on

the
the
ranges

of

Accelerometer,

apparatus

Analyzer).

sensitivity

Accelerometer

of

the

complete

(Microphone

and

frequency

employed.

arrangement

Preamplifier

Amplifier,

re-

Typical

and

in-

Spectro-

Accelerometer
Type

Acceleration

Velocity

Displacement

1

~

= 10-•

Maximum

4332-4334:
4333-4335:

Accessories

meters = 40

Level:

Included:

Miqimum

4332 4333 4333 4332 4333
4334

cm/sec2

1

0.03

o.Oo3+

20

o.2+

o.Qo3+

8

X

t0-

inches.

3ooo

7500 g (peak) = 7.5 X

~ower

·

screened

1

Allen

3

Allen

1

adaptor W 1/8"

Level*)

R.M.S.

value

I

I

4335 4334 I 4334

I

3 2

I

em/sec Hz

.,

o.1

o.o1+

ft

60

0.6+

o.o1+

I

g (peak) = 3 X

cord,

plug

(JP
key,
screws,

W

to

Lower

4332

4335

Hz

---

---

3

30

Hz

---

3

30

300

106 cm/sec.:l (peak)

106

cm/sec

0018),

1h

". 'f

10-32

NF.

Limiting

I

-

I

I

I

.2

(peak

a>

t)'l)

">

Frequency

-1

12

---

)

f.

I

8 0

Higher

-----

kHz

kHz

1
3

10

-;ll

4335

18

*)

+

18

The
be

With

minimum

at

least

main

level is

6 dB

lower

amplifier

limited

than

lower

by

the

limiting

the

Preamplifier

corresponding

frequency

20

's

levels

Hz.

internal

in

the

noise,

table

which

.

will

normally

Orboe

Print -

Copenhagen

M!>r c h

196

7