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Signal Generator
1042
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Power Amplifiers
To Potentiometer in 2502
271027
Fig.5.4. Multiple Exciter Testing
Table Head Type 4813, or the General Purpose Head Type 4812 can be
used.
Before the Control Signal Selector, each feedback signal is normalized
and amplified in one channel of an Accelerometer Preamplifier Type 2622
and a Vibration Meter Type 2502. The 1042 controls the Meter time
con-
stant, the stabilizing relay and the cross-over frequency. If more than the
single cross-over frequency available here is required, the Vibration Pro-
grammer Type 4411 could be added to give up to 5 cross-overs.
Two signal generators, each with separately controlled compressors,
could be used if the generators were connected in the "Master-Slave" mode
(ref. Application of B & K Equipment to Mechanical Vibration and Shock
Measurements, section on Vibration Testing).
45
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