Control and monitor circuits

Page Title: Control and monitor circuits
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MIL-P-82534(OS)

Amendment -2

Any distortion of the fundamental signal, regardless of source, shall

not be allowed to affect the measurement of displacement or acceleration

amplitude of the fundamental input frequency to the vibration machine.

Such distortion shall be eliminated from the input control signal by

use of a tracking band pass filter between the input control circuit

and the amplitude servo system.

4.5.1.5.3.2 Vibration pickups. During tests specified in 4.5.1.5

the output of the vibration machine shall be controlled and monitored

by three piezoelectric accelerometers mounted in the vicinity of the

programmer so as to indicate the greatest motion of the supporting

fixture on which the programmer is directly mounted. The accelero-

meters shall be positioned in three mutually orthogonal axes. One

accelerometer, mounted with its axis parallel to the axis of motion,

shall be used to control power to the vibration machine. The remain-

ing two accelerometers, mounted parallel and perpendicular to the

vibration machine trunnion axis, shall be used to monitor cross-axis

motion. Unfiltered cross-axis motion as indicated by either accelero-

meter shall not exceed the filtered input to the vibration machine.

Motion transducers other than piezoelectric accelerometers shall not

be used for input control or monitoring.

4.5.1.5.3.3 Control and monitor circuits. Circuits used to control

and monitor the vibration system for tests specified in 4.5.1.5 shall

meet the following requirements:

(a) Displacement circuits shall indicate amplitude of input

displacement to the programmer over the range of 0.010-inch double

amplitude to the upper limit of the equipment to an accuracy of plus

or minus 10 percent from 10 to 100 cps.

(b) Acceleration circuits shall indicate amplitude of input ac-

celeration to the programmer to an accuracy of plus or minus 10 per-

cent over the range of 17 to 2040 cps. The circuits shall be capable

of indicating the amplitude of both the fundamental and. unfiltered

signal. It shall not be necessary, however, to indicate these signals

simultaneously."

Page 15, paragraph 4.6.1.1, last sentence: Delete "an indicated" and

substitute "as indicated".

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