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Input immunity to reverse polarity |
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|  MIL-P-63334(AR)
4.6.5.1 Input immunity to reverse polarity. Conduct this test in
sequence to, and upon successful completion of the tests specified in
4.6.5.7.1 to 4.6.5.7.5 inclusive. Perform the test for input immunity by
reversing the primary power source polarity to negative and energize the panel
assembly with the required potential for a minimum of 30 seconds. At the end
of the 30 second period, return the primary power source polarity to
positive. Repeat the tests of 4.6.5.7.1 to 4.6.5.7.7 inclusive and note any
difference in the regulated output voltages readings from the previous
measurements. The panel assembly shall show no evidence of damage as
indicated by the regulated output voltage measurements, to determine
compliance with the requirements of 3.5.3. This test shall be performed at
the temperature specified in 3.4.
4.6.5.2 Ground potential. This test shall be performed utilizing the
digital voltmeter specified in 4.5.3 to verify the ground potential of the
exposed metallic surfaces of the panel assembly enclosure, exclusive of elec-
trical terminations and sub-surface mounted parts. The panel assembly shall
conform to the requirements of 3.5.4. This test shall be performed at the
temperature specified in 3.4.
4.6.5.3 Rheostat performance. Adjust the regulated voltage supply to
apply VDC to each of the specified rheostat circuits as designated in 3.6.1.
For each respective circuit load, the respective rheostat knob shall be
rotated as specified in 3.6.1. Throughout the range of rotation, for each
rheostat knob, observe the digital voltmeter to determine compliance with the
requirements of 3.6.1, at the temperatures indicated in 3.4 and 3.4.3.
4.6.5.4 Rheostat R1. This test shall be performed with the primary power
source voltages in Table I applied as specified in 3.6.1.1. Switch S1 shall
be in the "OFF" position during this test. The total measured current
controlled by Rheostat R1 for each respective rheostat wiper arm position and
applied primary power source voltage shall be within the tolerance specified
in Table I of 3.6.1.1, at the temperatures indicated in 3.4 and 3.4.3.
4.6.5.5 Rheostat R2. This test shall be performed with the primary power
source voltages in Table II applied as specified in 3.6.1.2. Switch S1 shall
be in the "EMERGENCY POWER ON" position during this test. The measured Rheo-
stat R2 output voltage for each respective circuit under the specified DC load
conditions, rheostat wiper arm positions, and applied primary power shall
exhibit the voltages specified In Table II of 3.6.1.2, at the temperatures
indicated in 3.4 and 3.4.3.
4.6.5.6 Output of voltage regulated supplies. Prior to conducting the
tests of the regulated outputs In Table IV the following preliminary adjust-
ments shall be made to the panel assembly:
a. Set the Input voltage to +24 VDC at J1-H.
b. Set the battery charging circuit to maximum load (shorted battery)
condition.
c. Set the reticle projector load to 800 ma.
d. Set he high voltage oscillator load to 20 ma.
e. Adjust the trimpot on TB2 to provide +6.5 volts output at J1-L.
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