MIL-DTL-18396E
4.5 Comparison inspection. Comparison inspection shall consist of the tests for samples 1 and 2 for test groups I
and III specified in table I, except that the vibration test may be waived. Sample units subjected to comparison
inspection shall not be delivered on a contract or order. Comparison inspection shall be performed every three years.
4.6 Visual and mechanical examination. Switches shall be examined visually to verify that design, construction and
workmanship are in accordance with this specification (see 3.5). Weight, material certification, physical dimensions
(including creepage and clearance), however are not required for more than two switches of the same type for
comparison inspection.
4.6.1 Material certification. The materials and plating used in the construction of the switches shall be certified as to
4.6.2 Weight. The weight of the switch shall be measured and recorded. The weight shall not differ from the weight
of the switch specified on the drawing (see 3.5) by more than 10 percent.
4.6.3 Creepage and clearance. Creepage and clearance distances shall be demonstrated by actual measurement
to be in accordance with 3.5.3.
4.7 Tests.
4.7.1 Operation. The operation test shall consist of the minimum number of electrical operations to ascertain that the
electrical circuitry in each position of the switch is in accordance with the circuits specified on the detailed drawing.
An audible or visual device shall be used to indicate the opening and closing of the circuits at each position and each
deck. The indicating means shall permit observation as to whether the contacts are shorting or nonshorting.
Momentary or positive positioning shall also be verified during this test (see 3.5.4.2 and 3.5.4.4).
4.7.2 Rotational torque. The torque required to rotate the switch shaft with respect to the switch body shall be
measured by a torque wrench or other suitable torque measuring position in both directions. The torque shall be
taken as the average value of the measurements.
4.7.3 Dielectric withstanding voltage (see 3.5.4.5). Switches shall be tested in accordance with method 301 of MIL-
STD-202. The following details shall apply:
(a) Magnitude of test voltage For switches rated at 125 volts, the test voltage shall be 1250 volts r.m.s. For
switches rated above 125 volts, but not in excess of 500 volts, the test voltage shall be 2000 volts r.m.s.
(b) Points of application of test voltage The test voltage shall be successively applied between each electric
circuit and grounded metal parts, and between each principal electric circuit and grounded metal parts, and
between each principal electric circuit and all other principal circuits.
(c) For qualification and comparison inspection the test voltage shall be applied for one minute. For quality
conformance inspection, the test voltage may be applied for 1 second, at 1500 volts for 125 volt switches and
2400 volts for switches rated above 125 volts but not in excess of 500 volts.
(d) Examination after test Switches shall be examined for evidence of flashover, mechanical damage, arcing,
and insulation breakdown.
4.7.4 Insulation resistance (see 3.5.4.6). Switches shall be tested in accordance with method 302 of MIL-STD-202.
The following details shall apply:
(a) Test condition B (test potential 500 volts).
(b) Points of measurement In each switch position with test voltage applied between each principal circuit and
grounded metal parts and between each principal circuit and all other principal circuits.
(c) The test voltage shall be applied for 15 seconds.
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