MIL-PRF-18148D
4.5.9.1 Contact resistance test at room temperature. Mate the plug and receptacle.
Stabilize both connectors at room temperature (see 4.4.1). Perform the test of 4.5.9 with both
connectors and the environment at room temperature.
4.5.9.2 Contact resistance test at low temperature. Mate the plug and receptacle.
Stabilize both connectors at low temperature (see 4.4.1). Perform the test of 4.5.9 on the cold
connectors in a room temperature environment.
4.5.9.3 Contact resistance test at high temperature. Mate the plug and receptacle.
Stabilize both connectors at high temperature (see 4.4.1). Perform the test of 4.5.9 on the hot
connectors in a room temperature environment.
4.5.10 Receptacle strength test (applies only to receptacles). This test shall consist of the
following steps.
a. Stabilize the receptacle at room temperature (see 4.4.1). Perform the test of 4.5.10
with both the receptacle and the environment at room temperature.
b. Retaining pins: Engage a test screw with the receptacle. Apply a tension of
500 ± 50 pounds for 5 ± 1 seconds. Release the tension. Gradually apply the following torque to
the handle of the test screw until the indicated value is reached. Apply a torque of
10 ± 1 pound-feet to the screw for 5 ± 1 seconds. Examine the receptacle for the requirements of
3.12.9.
c. Contact pins: Slowly apply the following forces until the indicated values are reached.
Apply a torque of 50 ± 5 pound-inches about the axis of each contact pin by applying the torque
to the terminal blocks. Apply the torque in one direction for 5 ± 1 seconds. Apply the torque in
the opposite direction for 5 ± 1 seconds. Examine the receptacle for the requirements of 3.12.9.
4.5.11 Life test.
4.5.11.1 Life test (applies only to plugs). Attach a 000-gauge cable to the connector. At
the beginning of the test, lightly lubricate the contact pins of the appropriate mating receptacle,
the plug's electrical contact sockets, and the plug's worm gear with a cotton swab dipped in light
lubricating oil. Engage the plug with the receptacle and mount the combination such that the
axis of the contact pins is horizontal. A cycle is one engagement and one disengagement of the
plug and receptacle. Perform 5000 cycles by hand at a rate not greater than 30 cycles per minute.
Every 500 cycles, wipe clean the plug contact sockets, the receptacle contact pins, and connector
worm with a clean soft cloth and relubricate. Every 1500 cycles, replace the receptacle with a
new one. Examine the plug for the requirements of 3.12.10. Perform the tests of 4.5.8.1 and
4.5.9.1. Examine the plug for the requirements of 3.12.10.
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