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TM 9-254
10-9.
Universal Vibration Tester.
a.
Description. The universal vibration tester (fig. 10-10) is motor driven. It has a vibration table to which
various adapters for fire control instruments may be secured. The amplitude and frequency of the tester are adjusted as
required by the specifications for the instruments to be tested. Frequency of vibration is controlled by adjusting the weights
on the vibration generator shaft. Varying the speed of the tester is accomplished by adjusting the pitch pulley which is
mounted on the motor shaft of the vibrator.
b.
Use. The universal vibration tester is used to simulate conditions of shock and vibration normally
encountered in field use of fire control instruments. Through its use it can be determined that all parts are properly
secured and that all dirt has been removed from inside the optical instrument.
Figure 10-10. Universal Vibration Tester
10-10.
Lens Bench.
a.
Description. The lens bench shown in figure 10-11 is an instrument for measuring focal length of a single or
compound lens. In addition, it can be used to test many other characteristics.
10-9
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