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Page Title:
Shipboard Intermediate Level Maintenance |
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|  MIL-N-81604C(AS)
3.5.1.6 Platform Electronics - The electronics required for the
functional operation of the platform shall be contained within
the IMU compartment.
3.5.1.6.1 Basic Functions - The internal IMU electronics shall
include the following: stable element electronics, gimbal servo
electronics, temperature control circuits, acceleration conver-
sion circuits, gyro torquing circuits, oscillator countdown and
-.
mode sequencing circuits, built-in test circuits, and power
supply module(s). The power supply shall provide the IMU electronics
with regulated, short circuit and overvoltage-protected power.
3.5.1.6.2 ANCU Interfacing - In addition to the above functions,
the platform electronics shall provide inertial velocity data
output in digital format and receive digital torquing correction
(Refer to 3.4.4.1. ) Analog alignment *
data inputs from the ANCU.
circuitry for leveling the platform in event of ANCU failure
shall also be included.
3.5.1.6.3 Calibration Memory. Also included in the IMU is an
additional section that will contain the calibration data storage
module. This module shall provide for the storage of gyro and
accelerometer parameters unique to each IMU. Refer to table VIII.
Calibration data shall be filled at the intermediate maintenance
level.
3.5.1.6.4 Shipboard Intermediate Level Maintenance - At-sea
calibration and unit level maintenance of the IMU shall be per-
formed by special test equipment as defined in XAS-1233, or
equivalent.
3.5.1.6.5 VAST Compatibility - The IMU electronics external to
the platform gimbal set shall conform to the requirements of
AR-8, AR-9, and AR-10.
3.5.1.6.7 Power Requirement. - The IMU power requirements shall not
*
exceed those shown in figures 17 and 18. The 115 volts rms,
*
400-Hz , 3-phase power will be supplied from the aircraft. The
PSU shall supply the 28 volts d-c requirements of the IMU. The *
*
CAU shall supply 26 volts rms synchro excitation to the IMU
*
(refer to 3.4.4.3.4).
3.5.1.8 Mechanical Design - Mechanical design shall, in general
conform to the requirements of MIL-E-5400.
3.5.1.8.1 Weight - The IMU weight shall be no greater than
37.5 pounds.
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