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Description.
General.
The Vibration Pick-up Preamplifier Type 1606 is designed for use in
vibra-
tion measuring
systems and constitutes
an important link between the B
&
K
Accelerometers and
the
appropriate measuring amplifier,
e.g.
Frequency
Analyzer
Type
2107, Audio Frequency Spectrometer
Type 2112
or Microphone
Amplifier
Type
2603.
Input
Capacitive
Attenuator
~
Sensitivity
Adjustment
Shaker
Table
+
Amplifier
>
Amplitude
Adjustment
Integ rating
Networks
~
AC mains
100-2J.OV
To Type
2107,2112,
--.2603 or 2801
261186
Fig. 1. Block diagram of Preamplifier with built-in shaker table.
The Preamplifier mainly
consists
of a two-stage amplifier, a set of integrat-
ing networks and
a
built-in shaker table for calibration purposes. The input
impedance of the
amplifier
is made high to ensure a low cut-off frequency
of the accelerometer. For
example
when the B & K Accelerometers are
employed, measurements can
be made down to
2 Hz (c/s).
By
selecting various
built-in integrating networks, the acceleration dependent signal derived from
the Accelerometer can readily be converted into a signal which is propor-
tional to the
velocity
or displacement of the object under investigation. The
built-in shaker table allows the complete measuring set-up to be
calibrated
at an acceleration level of 1 G
*).
Both filament 'and plate
voltages
for the
•)
G equals
the
acceleration obtained
by
the gravitational force of
attraction
of the eartll
3
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