MIL-PRF-62413B(AT)
voltage for conformance to specification requirements. After this, disassemble and inspect the
pickup.
TABLE IV. Humidity conditions test cycle.
Ambient temperature
Relative humidity
Time period
C (F)
(%)
(hours)
8
95±5
54±3 (129±5.4)
4
Holding chamber moisture
54±3 (129±5.4)
content constant
gradually down to
8
Holding chamber moisture
21±3 (70±5.4)
content constant
Up to 95±5, holding chamber
21±3 (70±5.4)
4
moisture content or adding
uniformly up to
vapor to reach required value 54±3 (129±5.4)
4.4.7.4 Salt fog. To determine conformance to 3.5.4, the pickup shall be tested as
follows: Expose the pickup to a salt fog for not less than 48 hours. The fog solution shall be 5%
sodium chloride (NaCl) and 95% distilled water by weight. The temperature shall be maintained
between 32 °C (90 °F) and 35 °C (95 °F). Fog density shall be 3 quarts of solution per 28.31 m3
(10 ft3) of chamber volume per 24 hours.
4.4.7.5 Sand and dust. To determine conformance to 3.5.5, the pickup shall be tested as
follows: Subject the pickup to a sand and dust test in accordance with MIL-STD-810,
method 510. The pickup need not be operated during the test; however, at the conclusion of the
test, and prior to any cleaning of the pickup, check insulation resistance and output voltage for
conformance to specification requirements. Criteria for passing the test shall be as defined in
MIL-STD-810, method 510.
4.4.7.6 Fungus. To determine conformance to 3.5.6, the pickup shall be tested as
follows: Inoculate the pickup with a spore suspension and test in accordance with the
requirements of MIL-STD-810, method 508. The temperature shall range from 27 °C (80 °F) to
29 °C (84 °F) and the relative humidity from 96 to 100% for a period of 28 days.
4.4.7.7 Chemical resistance. To determine conformance to 3.5.7, the pickup shall be
exposed to the chemicals as specified for not less than 48 hours.
4.4.7.8 Vibration. To determine conformance to 3.5.8, the pickup shall be tested as
follows: When normally mounted and while powered, subject the pickup to vibrations of 5 g
magnitude in each direction along each of 3 mutually perpendicular axes at a logarithmic sweep
rate. The total cycling vibration time shall be equivalent to 20 minutes per axis from 5 to 2000 to
5 Hz with each 20-minute test period representing 1609 km (1000 miles) of vehicle operation.
Conduct a resonance sweep to identify up to four of the most severe resonances and then
accomplish resonance dwells for 1/6 of the total cycling vibration time at each resonance at the
specified levels.
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