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|  MIL-T-81778C(AS)
i.
Built-in-test (BIT) tests.
(1) The BIT pointing test capability shall be measured to an
accuracy of 1 percent 0.2 degree in the region of
30 degrees.
(20 The azimuth and elevation BIT search fault isolation test (FIT)
signal shall be measured to an accuracy of 1 percent
in the range from 0 to 5 Vdc.
(5) The azimuth and elevation BIT track fault isolation test
signal shall be measured to an accuracy of 1 percent
in the range from 0 to S Vdc.
j.
Antenna pre-position tests, The antenna azimuth and elevation
position shall be measured to an accuracy of
1 percent 0.2
degree in the region of -40 degrees elevation and O degree
azimuth
1.2 Servo electronic subassembly. The LFTS shall be capable of per-
the following tests on the servo electronic subassembly of Antenna
a.
Power regulator tests.
(1) The dc voltages shall be measured to an accuracy of 0.5
percent in the range from 12 to SO Vdc.
(2) The dc voltage ripple shall be measured to an accuracy
of 3 percent in the region of 150mV.
(3) The power logic shall be verified.
b.
Amplifier/phase detector gain test. The azimuth and elevation
amplifier gain shall be measured to an accuracy of 4 percent
for both search and track.
c. Servo response test. The azimuth and elevation valve driver
response shall be measured to an accuracy of
10 percent.
d. Tachometer loop response tests, The azimuth and elevation
amplifier response gain and band pass shall be measured to
an accuracy of 4 percent
e. Secant multiplier tests. The azimuth h and elevation error
signal shall be measured to an accuracy of 1 percent for
three levels of search and track in the range from O to 6.5
Vdc ,
f. Gimbal limit tests, The azimuth and elevation gimbal limit
angles shall be measured to an accuracy of 3 percent 0.2
degree in the region of 65 degrees.
g . Display feedback resolver excitation tests The azimuth and
elevation resolver excitation
and
shall be measured
to an accuracy of
5 percent in the range from 0 to 10 Vrms.
h. Spin motor drive tests.
(1) The azimuth drive sum amplitude shall be measured to an
accuracy of 2 percent in the region of 6.5 Vat.
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