MIL-DTL-24552B(SH)
activity of such failure.
4.4 Sample size. The
contractor shall submit two sample units of the
type for which qualification
is desired (see 4.2.1). A sample unit shall
consist of: One terminal and
three plugs for riser types; one terminal, three
plugs, and one seal for back
connected types; and one switch and two plugs for
switch assemblies.
4.5 Inspection conditions. Unless otherwise specified herein, all
inspections shall be performed in accordance with the test conditions as
specified in MIL-STD-202. Except for the tests specified in 4.7.1 and 4.7.7,
the plugs and terminals shall be terminated using cable and wire as noted in
6.5.
4.6
Examination.
4.6.1 Visual and dimensional examination. Plugs, terminals, switches,
and seals shall be visually examined to verify that the materials, design,
construction, physical dimensions, marking, and workmanship are as specified
in the applicable requirements (see 3.1, 3.3, 3.4, 3.5, 3.7, and 3.8).
4.7
Test methods.
4.7.1 Dielectric withstanding voltage. Plugs and terminals or switches
shall be subjected to a dielectric withstanding voltage test in accordance
with method 301 of MIL-STD-202. The following details shall apply:
a. Nature of potential - 60 hertz (Hz) root mean square (rms) ac and
shall approximate a true sine wave.
b. Magnitude of test voltage - 2500 volts rms (terminals and plugs),
2000 volts rms (switches).
c. Points of application - When testing materials, the potential shall
be applied between each phase and the metal mounting plate and
between each phase and all adjacent phases. When testing plugs, the
potential shall be applied between each phase and between each phase
and any metallic parts.
d. Rejection criteria - Failure to be as specified in 3.6.1.
4.7.2 Insulation resistance. Insulation resistance shall be measured
in accordance with method 302 of MIL-STD-202. The test voltage (500 volts
direct current (Vdc)) shall be applied between electrical conductors and
between electrical conductors and ground. When switches are present, they
shall be in the energized (closed) position. A resistance of less than the
values specified in 3.6.2 shall be cause for rejection.
4.7.3 Contact engaging and separating forces. Individual terminal
sockets shall be tested for initial contact engaging and separating force in
accordance with MIL-C-39029 for size 4 contacts (see 3.6.3).
4.7.4 Plug engaging and separating forces. Mated plugs and terminals
or switches shall be tested in accordance with method 2013 of MIL-STD-1344.
Exceeding the force specified in 3.6.4 shall be cause for rejection.
4.7.5 Cable pull-out. Three plugs shall be individually placed in a
tensile testing machine. Tests shall be made at room temperature and with a
head speed of ½ inch per minute, until load specified in 3.6.5 has been
applied. Evidence of discontinuity or relative movement between any conductor
and its termination shall be cause for rejection.
4.7.6 Ambient temperature extremes. A terminal with one cabled plug
and two covers mated shall be subjected to a high and low temperature test in
accordance with method 501.2, procedure II and method 502.2, procedure II of
o
MIL-STD-810, except that the high temperature shall be 125 C and the low
o
temperature shall be minus 20 C (see 3.6.6). The samples shall then be
subjected to the dielectric withstanding voltage test of 4.7.1 and the
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