MIL-PRF-62539A
4.7.1.1 Endurance control. When connected in a circuit using the battery configuration
as shown in figure 7, operate the module per table III for 400 cycles. Then connect the circuit,
using the generator configuration as shown in figure 7, operate the circuit per table IV for an
additional 400 cycles. Then, verify conformance to 3.5.1 by testing as specified in 4.8.1.
4.7.2 Identification and marking. Inspect module for improper or illegible marking.
4.8 Environmental conditions verifications. Module shall meet the operating performance
requirements of 3.3 after exposure to the conditions of 4.8.1 through 4.8.7.
4.8.1 Waterproofness. The module shall be submerged in a container with the uppermost
surface a minimum of one inch below the surface of 5% of saline solution, and installed in the
chamber. The module shall be observed during its entire period of submersion and shall be
operated while submerged for 30 minutes at full rated current and voltage. the chamber shall be
evacuated to a pressure 68.94 kPa (10 pounds per square inch (psi)) below atmospheric so as to
apply a minimum of 68.94 kPa (10 psi) internal pressure to all voids within the module. During
this period the module shall be carefully observed for poor seals, as evidenced by bubbles escaping
from the interior of the module. Leakage thus indicated shall be considered as noncompliance
with the waterproofness requirement and the module shall be rejected. Bubbles which are the
results of entrapped air on the exterior surfaces of the components shall not be considered a leak.
Repeat the same process while the module pressurized to ten lbs above atmospheric.
4.8.1.1 Waterproofness for acceptance. The module shall be exposed to the test and
verification of 4.8.1 except that tap water shall be used in lieu of salt water.
4.8.2 Shock resistance. The module shall be mounted to the test fixture in the installed
interface configuration and subjected to a saw tooth pulse of 20 ± 2 gravities for 11 ± 1.1 ms
three times in each of the three orthogonal axes for a total of 18 shock pulses. The saw tooth
pulse configuration and tolerance limits shall be as shown for ground equipment in figure 516.4-4
of MIL-STD-810, or equivalent (see 4.2.1).
4.8.3 Vibration resistance. Modules shall be solid mounted to the vibration fixture in the
installed interface configuration using the bolt holes of the mounting flange. Sinusoidal cycling
time shall be 30 min/1609 kilometers (km) (1000 miles). Maximum cycling shall be 3 hours (hr).
Each sweep shall be 5 to 500 to 5 hertz (Hz) in 15 min. The test shall be conducted in each of the
three orthogonal axes. Amplitude and test level shall be in accordance with the curve of figure 4.
Resonant frequencies shall be determined and a sinusoidal resonance search shall be conducted for
the four most severe resonant frequencies of the module. The module shall be subjected to each
severe resonant frequency within each 60 min sweep test. The frequency of applied vibration shall
be swept over the specified range in accordance with figure 5. The sweep time is that of an
ascending plus a descending time shown in figure 5.
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