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sists of an exciting and measuring
section.
The B
&
K Calibration Exciter
Type 4290 is fed from the Beat Frequency Oscillator Type 1013. To keep a
constant acceleration level on the table of the Exciter, the output signal
from a built-in accelerometer is applied
via
one of the B
&
K Cathode
Followers and the
Microphone
Amplifier Type 2604 to the
compressor
circuit of the Beat Frequency Oscillator. The output
signal
from the accelero-
meter under test is then applied to the measuring
section
which is
comprised
of another Cathode
Follower
and
Microphone Amplifier
Type
2604, and
finally the Level Recorder. To derive
automatic scan
of the Beat Frequency
Oscillator a mechanical
connection
is made to the Level Recorder.
In Fig. 5.19 is reproduced a typical
sensitivity
curve of an Accelerometer
Type 4334 recorded by this
set-up.
From the
curve
is clearly
seen
the natural
frequency of the
Accelerometer.
C.IUw.teona..t,_
.t.ccM__.., Type, 014
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111.762
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23
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lrmt
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.......,.,..._.
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-
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----
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10000 Hz
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Fig.
5.19.
Typical accelerometer calibration chart with frequency response
curve
as obtained with the above type of set-up.
41
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