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|  MIL-N-81604C(AS)
Appendix I
Para 30.5.11.2
(cent)
*
Roll Angle - Refer to 3.4.4.2b(2). The CAU
b.
shall load the roll synchro from the IMU with
a CT conforming to 26V-08CT4C. The impedance
to ground shall be greater than 2 megohms.
*
Platform Heading (X8) - Refer to 3.4.4.2b(4).
c.
The CAU shall load the fine heading resolver
from the IMU with an impedance to ground
greater than 2 megohms.
.
Sin Lat/Mag Slave Hdg Error - This output from
d.
the CAU to the IMU shall be switched auto-
matically by the CAU to output the appropriate
*
signal as a function of the backup mode. Sine
*
latitude shall be supplied in the free mode
*
and magnetic slave heading error shall be
*
supplied in the magnetic slave mode.
(1) Sin Lat - This signal shall be propor-
tional to the sine of the latitude angle
and is only defined between S70 and S90
or N70 and N90. The range of the signal
*
shall be -1.413 to -1.504 volts d-c and
*
+1.413 to +1.504 volts d-c and shall have
an accuracy of 10 millivolts (90=
+1.504 volts). This output shall be
designed to drive a minimum impedance of
20K Ohms
(2) Mag Slave Hdg Error - This signal shall
be *
proportional to the difference between
*
the magnetic heading input from the HARS
*
and the position of the magnetic heading
*
servo. The range of the signal shall be
*
13 volts d-c with an accuracy of 1
*
volt d-c. The scale factor of the signal
shall be 1 degree of heading error
*
= 10 volts d-c. Zero volts = zero heading
The output shall be a positive
error.
voltage when the magnetic heading from the
HARS is greater than the magnetic heading
derived within CAU.
Synchro Excitation - The CAU shall provide an
e.
*
output of 26 volts rms, 400 Hz, phase C to the
IMU to be used as excitation to the IMU pitch
and roll synchros and the heading resolver.
This same excitation is also supplied as refer-
ence to the ANCU A/D converter, as well as
internally to the CAU A/D converter.
186
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