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|  MIL-G-18853C(OS)
a. The rate gyro is positioned on a turntable (by the application
of 20 2 inch pounds torque to each of its 3 mounting screws) so that
the mounting base is at right angles to the turntable.
b. The connector plug is at the left when viewing the gyro mount-
ing base, and
c. The turntable is rotating in a clockwise direction when viewed
from above.
3.3.5 Zeroing.
3.3.5.1 Null voltage. When feeding a 25,000 250 ohm resistive
load and with a 55 1 volt microsyn input and 115-volt three-
phase 400-Hz motor input, the output voltage shall be less than 0,15
volt with the rate gyro stationary and shall be repeatable to within
0.03 volt when moved from the null position and allowed to return.
3.3.5.2 Motor assembly balance. With the motor running and with
the rate gyro resting on either end or either side, the output voltage
shall be within 0.03 volt of the null voltage obtained in 3.3.5.1.
3.3.6 Spin axis alignment. The spin axis shall be perpendicular,
within 1.25 degrees, to a plane passing through the surface of the
three mounting bosses on the base.
3.3.7 Linearity. The rate gyro output must be linear, with respect
to the rate of change of angular velocity, to within 10 percent.
3.3.8 Insulation.
3.3.8.1 The insulation resistance, between all pins of P601 con-
nected in parallel, and ground, shall be 50 megohms minimum.
3.3.8.2 All wiring shall withstand a 500-volt, 60-Hz potential
for one minute, between all pins of P601 connected in parallel and
ground, with no evidence of insulation breakdown.
3.3.9 Frequency. The undamped natural frequency about the gimbal
axis shall be 15 Hz with a tolerance of plus 10 minus O Hz.
3.3.10 Damping. The damping about the gimbal axis shall be 3 per-
cent of critical minimum. Three percent critical minimum represents
at least 17 percent decay in amplitude of oscillation per cycle.
3.3.11 Response time. The rate gyro motor shall reach 90 percent
of full speed in 45 seconds maximum, with the power supply as specified
in 3.5.1.
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