MIL-G-85742/4(AS)
4.2
Quality conformance inspections.
4.2.1 Unit tests. The assembly shall be subjected to a unit test in
order to establish conformance to the requirements specified herein.
4.2.2 Input voltages. External power supplies providing +15.00 + 0.15
volts V), -15.00 ± 0.15 V, and +5.00 ± 0.15 V shall be applied at pins 11,
12, and 10, respectively, using pin 1 as return (connector A2A2P1).
4.2.3 Test methods. Details of methods and procedures shall be in
accordance with the Government approved test procedure.
4.2.3.1 Rate gyro drive voltage. Measure the voltage on E15 of the
G-Bias board (Drawing 1466AS1326) and verify that it meets the requirements
specified in 3.2.1.
4.2.3.2 Roll angle drift. With the G-Bias inhibit line grounded,
measure the voltage on pin 20 of connector A2A2P1 (should be less than 20
mV). Remove the ground from the G-Bias inhibit line. The voltage shall
meet the requirements of 3.2.3.
4.2.3.3 Roll angle accuracy. Measure the voltage on pin 20 of connector
A2A2P1. Rotate the unit about its longitudinal axis at a rate of 60 deg/s.
Compare the periods of the saw-toothed roll angle output to the time of the
actual revolutions. Calculate the percent error as follows:
time of five roll angle periods
Percent error = 1 -
time of five revolutions
The error shall meet the requirements of 3.2.4.
4.2.3.4 G-Bias output voltages. Initialize the unit in each of the
three positions shown in Figures 1, 2, and 3. Measure the Magamp IN out-
puts as the unit is rotated about its longitudinal axis at a roll rate of
60 deg/s. The voltage waveforms shall meet the requirements of 3.2.5.
4.2.3.5 Torque steering data delay. Ground the G-Bias inhibit line and
apply 10 V to the GB/NG input disable line. Apply 200 mV to the Az and E1
torque telemetry outputs and 4 V to the Az and E1 G-Bias telemetry outputs-
Measure the Magamp in outputs. Remove the 10 V from the GB/NG input
disable line and verify a discrete voltage step of approximately 1.5 V in
both Magamp In signals. After a delay of the amount specified in 3.2.5, a
second discrete step of approximately 1.5 V shalt occur.
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