MIL-DTL-83361B
the fluid bath and quickly wiped dry (compressed air shall not be used). The coverglass and dial
shall immediately be inspected. Any evidence of fogging or damage shall be cause for rejection.
4.5.13 Insulation resistance. The indicator shall be subjected to an insulation resistance
test in accordance with MIL-STD-202, Method 302, "Insulation Resistance", Test Condition B.
The resistance shall be measured between the external connections of each mutually insulated
circuit and between each external connection of the case. The insulation resistance shall be a
minimum of 100 megohms. The lighting circuit shall not be included in this test.
4.5.14 Voltage and frequency variation. The indicator shall meet the scale and friction
error tolerances specified in tables II and III when the voltage and frequency are varied as follows:
a.
26 V, 400 Hz.
b.
22 V, 320 Hz.
c.
22 V, 480 Hz.
d.
30 V, 320 Hz.
e.
30 V, 480 Hz.
4.5.15 Magnetic effect. The indicator, first not operating and second, operating on rated
voltage, shall be rotated in a vertical plane about a short bar magnet compass with the nearest
part of the indicator 5.5 inches from and magnetically east or west of the center of the compass.
Starting directly under the compass, the indicator shall be held in positions 0 degrees, 45
degrees, 90 degrees, 135 degrees, 180 degrees, 225 degrees, 270 degrees, and 315 degrees from
the initial position. At each of these positions, the indicator shall be rotated on its own
horizontal axis until it is in its normal upright position. The horizontal magnetic field intensity
shall be 0.17 Oe to 0.19 Oe. Deflection of the compass at any of the specified positions shall not
exceed 1 degree.
4.5.16 Effect of lead length. The indicator shall not change more than 1 degree of arc
when the lead length between the indicator and transmitter is changed from 5 feet to 500 feet of the
No. 20 AWG gage wire. Equivalent resistance may be substituted for the added wire length. The
ground lead shall be kept short.
4.5.17 Temperature-altitude. The temperature-altitude test shall be conducted in
accordance with MIL-STD-810, Method 520, "Temperature, Humidity, Vibration, and Altitude",
qualification procedure (except the temperature shall be -67 °F (-55 ºC)) with a chamber pressure
equivalent to an altitude of 100,000 feet. The rate of pressure change shall not exceed an average
of 3 psi per second while under these conditions. At the end of a 1-hour period, the scale and
friction error test of 4.5.5 shall be conducted. The errors shall not exceed the tolerances specified
in table III. This test may be conducted concurrently with the low temperature exposure test.
4.5.18 Shock. The shock test shall be conducted in accordance with MIL-STD-810,
Method 516, "Shock", functional shock procedure.
4.5.19 Electromagnetic interference. The indicator shall be subjected to electromagnetic
interference tests in accordance with MIL-STD-461, methods CE102, CS101, RE102, and RS103.
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