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|  MIL-N-81604C(AS)
Para 3.4.4.1e
(cont)
rotate about the X-axis. The true (high) state
shall cause the stable element to rotate in a
positive sense about the X-axis at a rate of
60 degrees/hour. The false (low) state shall
cause the stable element to rotate in a nega-
tive sense about the X-axis at a rate of 60
degrees/hour. The resolution shall be 0.2
*
The pulse widths shall be multi-
arcseconds.
*
pies of 1/300 second. In order to generate a
zero torque rate, for example, a 150-Hz square
wave would be provided. The synchronous gyro
torquing pulses shall be gated in the IMU with
the IMU 9.6-KHz clock in order to develop a
precision pulse width. Transstition from the
true to the false state and the false to the
true state shall be coincident with the rising
edge of the IMU clock. The line driver in the
ANCU and the line receiver in the IMU shall be
Type A circuits. The line receiver in the IMU
shall also be capable of operation with the
Type AA driver defined in table VII.
Y-Gyro Torque - This output from the ANCU to
(2)
the IMU shall cause the IMU stable element to
rotate about the Y-axis. The true (high) state
shall cause the stable element to rotate in a
positive sense about the Y-axis. All other
specification are the same as for X-Gyro
Torque.
Z-Gyro Torque. - This output from the ANCU to
(3)
the IMU shall cause the IMU stable element to
rotate about the Z-axis. The true (high) state
shall cause the stable element to rotate in
positive sense about the Z-axis. All other
specifications are the same as for X-Gyro
Torque.
f.
Calibration Data Memory - The calibration data
memory shall contain 512 bits which shall be used
to store up to 32 words of 16 bits each (15 bits of
data plus 1 bit parity).The ANCU or test equipment
designed in accordance with XAS-1233, or equivalent,
shall control the serial transmission of the data.
43
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