This program demonstrates the use of a Vee Scope or Optical Wedge.
This device (commonly a sticky label) is used for measuring displacement / distance and works using the principle of persistence of vision.
It is used as a method of 'verification' to establish that a vibration test system is doing what it should be, and not doing something unexpected due to incorrect input sensitivity set-up.
For example, the charge sensitivity multiplier has been set incorrectly at [x10] rather than [x1].
In the above case if the test is run, it will be out by a factor of 10 !
Controllers produced in the 1960's & 70's had a 'Cal' signal output which produced a frequency of 44.2260631020346 Hz (approximately). If the signal amplitude was adjusted to produce a displacement of 0.1 inch peak to peak, this would equate to an acceleration of 10gn peak.This was a verification not a calibration !
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