MIL-DTL-917F(SH)
4.3.2.4 Equipment energization. Equipment shall not be electrically energized for random vibration testing,
although energization should begin immediately thereafter to confirm failure-free operation. Equipment shall be
energized for thermal cycling, although for high power systems, equipment shall be operated at minimum load level.
The last thermal cycle shall be an increase. The equipment shall be turned off during chamber cool-down of thermal
cycling to permit internal parts to become cold. Full power load accommodation (for equipment so characterized)
shall be demonstrated immediately after temperature cycling, followed by a random vibration defect-free run of
5 minutes.
0.04g²/Hz
+3 dB/OCTAVE
-3 dB/OCTAVE
0
350
20
80
2000
FREQUENCY - Hz
FIGURE 1. Random vibration spectrum.
4.3.3 100-hour burn-in test. This test can be run in lieu of environmental stress screening (see 4.3.2). The
100-hour burn-in test shall be conducted by energizing the equipment for 100 hours at nominal voltage and
frequency, ambient temperature, and with all inputs and outputs connected to effect maximum rated loading. If a
failure occurs during this testing, the equipment is to be repaired and the test continued from the point where the
failure occurred.
4.4 Conformance inspection. Conformance inspection shall include the tests of table XXIV and the
examinations of table XXV. These examinations and tests detect deviations from detail design, ability to meet the
application environment, and detect hidden defects of materials. Each piece of naval shipboard electric power
equipment developed to the detailed requirements of this specification shall be examined for compliance with the
requirements specified in table XXIV or in the individual equipment specification developed using this
specification. The element of inspection shall encompass all visual examinations and dimensional measurements.
The examinations shall be conducted using the classifications of defects as specified in table XXV as applicable or
in the individual equipment specification developed using this specification. Non-compliance with any specified
requirements or presence of one or more defects preventing or lessening maximum efficiency shall constitute cause
for rejection.
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