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|  MIL-S-17000N(SH)
4.6.4 Insulation resistance test. Insulation resistance of electrical
circuits following the dielectric withstanding voltage test specified in 4.6.3
shall be tested at 50 V d.c. at room ambient temperature and humidity to deter-
mine conformance with 3.6.29. Insulation resistance test voltage shall not be
applied to circuitry which includes parts which would normally be damaged by
the test voltage, such as synchro, transistors, electrolytic capacitors, diodes
and other voltage sensitive components.
4.6.5 Wire pullout tests. Daily production check tests of the quality of
crimped connections for connector contacts and solderless wire terminal lugs
shall be made. Approximately ten crimps of each type (connector or wire terminal)
made each day shall be checked for pullout (crimp, tensile strength) in accord-
ance with MIL-C-28731, MIL-C-39029, MIL-T-16366, or MIL-T-7928, as applicable.
4.6.6 Vibration test. Vibration test to determine conformance with 3.7.3
shall be conducted in accordance with type I (environmental vibration) of
MIL-STD-167-1, except that the variable-frequency test shall be omitted. After
the tests, the circuits shall be checked to ensure proper operation and con-
tinuity (see 6.2.2).
4.6.7 Shock test. Shock test to determine conformance with 3.7.2 shall be
conducted in accordance with type A, class I of MIL-S-901. After the tests, the
circuits shall be checked to ensure proper operation and continuity. Units which
have been subjected to the shock test shall not be installed on board ship.
A shock test report shall be prepared in accordance with the data ordering
document included in the contract or order (see 6.2.2).
4.6.8 Transient test. A l-millisecond pulse of a magnitude sufficient to
provide 300 percent over voltage of the peak supply voltage shall be super-
imposed on the nominal supply voltage to the switchboard. The output of the
equipment power supply shall be observed on a calibrated oscilloscope to
determine conformance with 3.6.25. With a constant power supply input, the
output of the equipment power supply shall be observed on a calibrated oscillo-
scope, while the equipment is switched through all operational modes to determine
conformance with 3.6.25.
4.6.9 Enclosure test. Watertight requirements shall be subjected to the
test conditions in MIL-STD-108, except that the requirement for breaking and
reassembling joints sealed by gaskets prior to test applies only to cover or
door openings, not indicator or observation windows. Dripproof enclosures
shall be visually examined to verify that the unit conforms to the applicable
assembly drawing.
4.6.10 Equipment operating temperatures. The applicable component speci-
fications (for example, MIL-S-24187) shall be reviewed to verify that the various
components have been operated at temperatures and humidities equal to or exceeding
those specified for temperature range 4 for operating equipment in MIL-E-16400.
4.6.11 Geometric control of enclosures. After completion of the installa-
tion of all panel assemblies, back section modules, and harness wiring, the
individual front and back sections of each switchboard shall be assembled on a
common foundation. Individual sections shall be bolted to the foundation and
to each other using the intersection fastening hardware required to be shipped
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