MIL-PRF-62539A
4.3.2 Conformance inspection. Conformance inspection shall include the examinations
and tests from table II as defined in the contract.
4.4 Inspection conditions. Unless otherwise specified (see 6.2), all inspections shall be
conducted under the following conditions:
a. Air temperature: 22.8 ± 10°C (73 +18°F)
b. Barometric pressure: 96.5 (+6.8, -15.2) kilopascal (kPa) (28.5 (+2, - 4.5)
inches (in)) Hg of mercury
c. Relative humidity: 50 +30 percent.
4.5 Operating requirements verification.
4.5.1 Battery voltage sensing. The module shall be connected to 0-34 V dc variable
voltage power source with voltmeter and lamp as shown in figure 1. Connect pins A and B to
source, pin D to lamp, while pin C is unconnected. With power supply set at 14 V dc or above,
the switch shall be closed to energize unit. Wait at least 500 ms to allow "ON" delay timer to time
out. Raise voltage to 34 V dc observing lamp action. Lower voltage slowly until lamp goes out.
Record voltage at which lamp goes out. Continue to reduce to 4 V dc. Increase voltage to 34 V
dc, lamp should not relight.
4.5.2 Generator voltage sensing. The module shall be connected to 0-34 V dc variable
voltage power source with voltmeter and a lamp as shown in figure 1. Connect pins A, B, and C
to source, and pin D to lamp (Note: this differs from figure 1 - reference 4.2). With power supply
set to 15 ± 1 V dc close switch energizing unit. No time delay required. Raise supply voltage
slowly until lamp turns off. Record voltage. Raise voltage to 34 V dc observing lamp action.
Reduce voltage slowly to 14 V dc.
4.5.3 Power rating. The module shall be tested in a circuit as shown in figure 2 for 3000
cycles at a rate of 17 minutes per cycle. The current draw shall be 50 A for duration of 15 min
followed by a surge to 100 A for a duration of 70 ms.
4.5.4 Polarity protection. The module shall be connected with positive potential
connected to the case and negative potential connected to pins A, B and C for one minute
Reconnect pin as specified in 3.4.4. Verify performance of 3.3.1.1 and 3.3.1.2 to assure
conformance to 3.3.1.4.
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