MIL-PRF-18148D
4.5.8.1 Operating torque test at room temperature. Mate the plug and receptacle.
Stabilize both connectors at room temperature (see 4.4.1). Perform the test of 4.5.8 with both
connectors and the environment at room temperature.
4.5.8.2 Operating torque test at low temperature. Mate the plug and receptacle. Stabilize
both connectors at low temperature (see 4.4.1). Perform the test of 4.5.8 on the cold connectors
in a room temperature environment.
4.5.8.3 Operating torque test at high temperature. Mate the plug and receptacle.
Stabilize both connectors at high temperature (see 4.4.1). Perform the test of 4.5.8 on the hot
connectors in a room temperature environment.
4.5.9 Contact resistance test (applies only to plugs). This test shall consist of the
following steps.
a. Preparation: Connect the pins of an MS3509 receptacle with a copper shorting bar
that has a minimum cross-sectional area not less than that of the receptacle pins. Attach voltage
taps to the contact pins on the battery side of the mating receptacle. Engage the plug with the
mating receptacle. Attach the plug's cables to the power supply. Attach the receptacle's voltage
taps to appropriate instrumentation.
b. Apply a current of 1500 ± 30 amperes for 60 +2, -0 seconds.
c. Turn the current flow to zero amperes. Turn off the power supply. Let the connector
stand at room temperature for not less than 60 minutes.
d. Apply a current of 750 ± 15 amperes for 5 ± 0.1 minutes.
e. Turn the current flow to zero amperes. Turn off the power supply. Let the connector
stand at room temperature for not less than 60 minutes.
f. Measure the following:
(1) Monitor the potential difference between the tap soldered to the cable lug
attached to the 000-gauge cable on the plug's positive bus and the corresponding tap on the back
of the receptacle's contact pin. Note the largest potential difference.
(2) Monitor the potential difference between the tap soldered to the cable lug
attached to the 000-gauge cable on the plug's negative bus and the corresponding tap on the back
of the receptacle's contact pin. Record the largest potential difference.
(3) The applied current.
g. Examine the plug for the requirements of 3.12.8.
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