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|  MIL-N-81604C(AS)
Para 3.4.4.1g
(cont)
these signals may still be used internally to the
IMU, as well as supplied externally, although the
excitation shall be externally supplied as described
in 3.4.4.2c. Table IX presents the IMU synchro and
resolver characteristics. Table X presents the ANCU
analog/digital converter characteristics.
Pitch Angle - This three-wire signal shall be
(1)
supplied from a synchro in the IMU to a synchro-
to-digital converter in the ANCU.
Roll Angle - This three-wire signal shall be
(2)
supplied from a synscro in the IMU to a synchro-
to-digital converter in the ANCUC
Platform Heading (x1) - This four-wire signal
(3)
shall be supplied from a resolver in the IMU
to a resolver-to-digital converter in the ANCU.
Platform Heading (X8) -This four-wire signal
(4)
shall be supplied from a resolver in the IMU
to a resolver-to-digital converter in the ANCU.
h.
Temperature Monitor Signals - Four temperature
monitor signals shall be supplied from the IMU to
the ANCU as analog voltages which represent temper-
atures of the two gyros, the accelerometers, and
the stable element. The analog voltages shall be
converted to digital signals in the ANCU and may be
--
used as the variables in the equations which com-
pensate for temperature effects on the IMU during
*
alignment. Refer to table X for ANCU analog/digital
converter characteristics. The temperature monitor
signal output impedance shall be less than 1 ohm.
IMU Temperature Monitor Ground - This ground line
i.
shall be supplied to the ANCU for use in compensat-
ing for the ground differential between the IMU and
the ANCU. The ground signal is converted in an
ANCU analog-to-digital converter and supplied to the
software which corrects the temperature monitor
inputs for the ground difference between the two
+
units. Refer to table X for ANCU analog/digital
converter characteristics.
49
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