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|  MIL-N-81604C(AS)
Para 3.5.1.9.1c
(cont)
(20)
Outer Roll Servo Monitor - This signal shall
be an analog test point which monitors the
*
output of the outer roll servo amplifier
with the same characteristics as the Azimuth
Servo Monitor.
4.8 -KHz Power Supply No-Go - The true state
(21)
of this signal shall indicate a malfunction
in the 4.8-KHz power supply circuitry in the
IMU. The true or no-go state is indicated by *
*
a +0.25 O.25 volts d-c, while the go condi-
tion is +3.8 1.4 volts d-c when looking into *
an open circuit.
d.
Special Analog Test Points
(1) Inner Roll Resolver Output - In order to
monitor the inner roll resolver for fault
isolation , the IMU shall provide the inner roll *
resolver (S2 and S4) output signals to the
test equipment. The S4 line is grounded in
the IMU. These two output lines provide a
sine wave at a frequency of 4.8 KHz with the
voltage variable from zero to a maximum of
*
approximately 3.0 volts rms at 17 degrees
(gimbal stops).
(2) Resolver Reference Response Output - The IMU
shall provide the test equipment with resolver
and synchro excitation reference voltage.
These two excitation lines provide a single-
phase sine wave output with a voltage of
26 volts rms, at a frequency of 4.8 KHz in
*
the cage and coarse level modes, and 400 Hz
*
in gyro control mode.
*
NOTE
The inner roll resolver does not
*
change to 400 Hz in any mode, but
is always excited by the 4.8 KHz
frequency.
98
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