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