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4. DESCRIPTION
The principle of operation of the Accelerometer Calibrator Type 4292
will be described with reference to the schematic diagram given in Fig.4.1.
Resonance
adjustment
Input
socket
FET
Input
stage
10-32 NF threaded hole
Driver
amplifier
40 V supply
Amplitude
adjustment
Wien
bridge
oscillator
+
12 V supply
Voltage
+ 150 V
regulator
0-
20 dB
Integration
Output
amplifier .,_ __
____.---.---1
networks .,._ _ _ _ _ _ _ _ ....,
Sensitiv ity
adjustment
Fig.4. 1. Schematic diagram of the 4292
(Front view
of plug)
Output and
Power Supply
plug
271000
4.1. CALIBRATOR SECTtON
4.1.1: Wien Bridge Oscillator
The Wien Bridge Oscillator consists of an integrated circuit differential
amplifier with positive feedback from its output to its primary input via an
R-C network. It produces an amplitude stabilized, sinusoidal voltage at a
frequency of 79.6 Hz to excite the vibration system of the 4292. Its operat-
ing frequency corresponds to an angular frequency of 500 rad/sec as speci-
fied by the DIN Standard 45666.
14
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