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Electrical non firing sensitivity |
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|  MIL-82530(OS)
4. 6,1 Test procedure. The primer shall be subjected to the tests and
examinations as outlined herein. Unless otherwise specified, inability of the
primer to pass the tests and examinations shall constitute a failure.
4. 6. 1.1 Continuity and resistance. Using the ohmmeter specified in
4.4. la, measure the resistance of the primer. The resistance shall be not less
than O. 14 ohm nor more than 0.20 ohm.
4. 6.1.2 Electrical non firing sensitivity. Using the equipment specified
in 4.4.1c, subject the primer to a DC current of 1.00 plus or minus 0.10
ampere for a minimum of 10 seconds. The primer shall not function.
4. 6. 1.3 Insulation resistance. Using the megohmmeter specified in
4.4, 1b, subject the primer to an alternating potential of 1000 volts. applied
between the primer case and the shorted lead wires for a minimum of one second.
The resistance shall not be less than 50 megohms.
4. 6.1.4 Functioning tests.
4.6.1.4. 1 Direct current functioning. The direct current time test shall
be conducted utilizing the equipment specified in 4.4. 1c. The primer shall be
subjected to a DC firing current adjusted to 5.00 plus or minus 0.15 amperes.
The primer shall function within an upper specification limit of 5.0 milliseconds.
The occurrence of one or more duds shall be cause for rejection of the lot.
4. 6. 1. 4.2 Capacitor discharge functioning. The capacitor discharge test
shall be conducted utilizing the equipment specified in 4.4.1d. The primer shall
be subjected to the discharge of a 450 microfarad (maximum) capacitor charged
to 24 plus 4 minus 0 volts. The primer shall function within an upper specifica-
tion limit of 400 microseconds. The occurrence of one or more duds shall be
cause for rejection of the lot.
4 . 6 . 1 . 4 . 3 Output. The primer shall be placed in a suitable test fixture
indicated in Figure 1 or equivalent, and subjected to the discharge of a 450
microfarad (maximum) capacitor having a charge of 24 plus 4 minus o volts.
This test may be conducted at the same time as the capacitor discharge function-
i n g test 4.6.1.4.2. The primer shall be inserted in brass holders such that
the forward face of the case rests tightly against the insulation tape, over the
aluminum block. After firing, the primer output shall be evaluated by measuring
the depth of indentation caused in the aluminum block. A dial indicator reading
in thousandths of an inch shall be mounted over a horizontal surface plate in
such a manner that the indicator stem is perpendicular to the surface plate.
The aluminum disc shall be placed, indented side up, in a ring-type holder, so
arranged that the periphery of the bottom face of the disc is approximately
parallel to the surface plate. The indicator tip shall be lowered to the bottom
of the disc Indentation, and the indicator dial set to zero. Four readings,
measured in thousandths of an inch, shall be determined near the periphery of
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