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Page Title:
Calibration Data Word Sync (From the IMU) |
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|  MIL-N-81604C(AS)
Para 3.4.4.1f(2)
(cont)
XAS-1233, or equivalent, to place the IMU cali-
*
bration memory in a "write" state, thus allowing
*
calibration memory data to be transmitted to
*
the IMU. This discrete should be grounded in
the aircraft as the preferred method of prevent-
ing accidental modification of the calibration
memory. However, it is acceptable for the
*
signal line to be left open as an alternate
termination method. This discrete line may be
connected to the ANCU while bench testing or on
test equipment designed in accordance with
XAS-1233, or equivalent. When this discrete
input to the IMU is not connected, the cali-
*
bration memory logic shall interpret this as a
*
true state and go into the "read" state. The
line driver in the ANCU and the line receiver
in the IMU shall be Type C circuits.
(3) Calibration Data Word Sync (From the IMU) - This
sync from the IMU shall be provided to the ANCU
or test equipment designed in accordance with
XAS-1233, or equivalent, and shall be true
(high) coincident with the data label MSB. The
line driver in the IMU and the line receiver
in the ANCU shall be Type A circuits. The IMU
line driver shall also be capable of operation
with the Type AA receiver defined in table VI.
(4) Calibration Data (From the IMU) - The gyro
biases and scale factors and the accelerometer
*
biases and scale factors shall be transmitted
*
from the IMU memory to the ANCU or test equip-
ment designed in accordance with XAS-1233, or
equivalent, where they shall be used to compen-
sate for these IMU characteristics. The list
of calibration data functions along with the
*
label, range, LSB, and number of data bits is
shown in table VIII. The line driver in the
*
IMU and the line receiver in the ANCU shall be
Type A circuits. The IMU line driver shall
also be capable of operation with the Type AA
receiver defined in table VI.
46
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