IMI Sensors: A PCB Piezotronics Div 699A07 User Manual
MAN-0192 rev A Page 26 of 39 800-959-4464
center of gravity. Severe rocking modes can produce high transverse motion and
lateral loads on the moving coil and flexure, resulting in damage. When fitting test
transducers and fixtures onto the mounting platform, aim to keep the center of
gravity directly above, and in line with the center axis of the ¼-28 threaded hole.
This is a safeguard against side loading the shaker.
In some cases of extremely heavy shaker payloads at high vibration levels
(depending on the frequency), the 699A07 may exhibit both frequency and
amplitude instabilities. In this case, please reduce the excitation amplitude and/or
the payload to eliminate the effect.
The 699A07 electronics incorporates a shaker power amplifier with thermal
protection. If the shaker payload amplitude and run time exceed safe thermal
ranges, the shaker table power amplifier will protect itself and shut off. The unit
should be turned off and allowed to cool before resuming operation.
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