MIL-DTL-28748D
4.7 Methods of inspection.
4.7.1 Test methods. The following identified tests and test methods assure connector integrity within typical operating
conditions and applications. Alternate commercial industry standard methods are allowed, however when and alternate
method is used, the qualifying activity must be notified prior to performance of the test. The test methods described herein are
proven methods and shall be the referee method in cases of dispute.
4.7.2 Visual and mechanical examination. Connectors and associated fittings shall be examined to verify that the design,
construction, physical dimensions, marking and workmanship are in accordance with the applicable requirements (see 3.3,
3.4, 3.5, 3.6, and 3.7).
4.7.3 Permeability (see 3.5.1). The permeability of all parts of each connector assembly shall be measured with an
indicator conforming to ASTM A342.
4.7.4 Insulation resistance (see 3.5.2 and figure 5). Unmated connector assemblies shall be tested in accordance with
method 3003 of MIL-STD-1344. The following detail shall apply: Duration of application of test voltage shall be one minute
minimum.
4.7.5 Dielectric withstanding voltage (see 3.5.3 and figure 5). Unmated connector assemblies shall be tested in
accordance with method 3001 of MIL-STD-1344. The following details shall apply:
a. Nature of potential: AC.
b. Magnitude of test voltage: See table III.
c. Points of application of test voltage: Between contacts alternately connected and between contacts and body.
4.7.6 Contact retention (see 3.5.4).
4.7.6.1 Nonremovable contacts. Axial loads shall be applied to individual contacts in unmated connectors. The load shall
be applied uniformly at a rate of one pound per second in one direction and then the other direction.
4.7.6.2 Removable contacts (see 3.5.5). The contact shall be inserted and withdrawn 10 times from the same hole. The
axial loads shall be applied to individual contacts in unmated connectors. The load shall be applied uniformly (in the normal
removal direction) at a rate of one pound per second. The axial load must be maintained a minimum of 30 seconds. The
maximum axial displacement is .015 inch (0.38 mm) after seating of the contact.
4.7.7 Contact insertion and removal forces (see 3.5.5). Contacts shall be inserted and removed from the corresponding
connector inserts nine times by means of tools conforming to MIL-I-81969/18 and MIL-I-81969/20. The procedures and
instrumentation shall be capable of measuring the force applied parallel to the axis of the contacts. Measurements shall be
taken on the first and ninth cycles.
4.7.8 Temperature cycling (see 3.5.6). Mated connectors shall be tested in accordance with method 1003 of MIL-STD-
1344. The following details and exception shall apply:
a. Test condition A, except the high temperature shall be 125°C ± 3°C.
b. Measurements after cycling: Following the temperature cycling test, dielectric withstanding voltage shall be tested as
specified in 4.7.5.
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