MIL-DTL-55116D
4.7 Electrical tests.
4.7.1 Dielectric withstanding voltage.
4.7.1.1 At sea level. A potential of 500 volts rms shall be applied between each contact of the
connector and the remaining contacts connected together and to the shell. The voltage shall be
increased gradually from zero until the specified voltage is reached and shall be maintained at the value
for approximately, but not less than, 1 minute. The specified voltage shall be reached within 5 seconds
(see 3.5.1).
4.7.1.2 At high altitude. At a barometric pressure of 3.4 inches of mercury, a voltage of 300 V rms
shall be applied as described in 4.7.1.1 and the connector shall meet the requirement specified in 3.5.1.
4.7.2 Insulation resistance. The insulation resistance shall be measured between each contact of the
connector and the remaining contacts connected together and to the shell (see 3.5.2).
4.7.3 Contact resistance. The connector shall be mated with a test jig having non-rigid contact and the
electrical resistance between mating contact terminals shall be measured with a Kelvin bridge, or other
approved method (see 3.5.3).
4.8 Mechanical tests.
4.8.1 Contact depression. Two tests are required. First, a test plate shall be applied to non-rigid
contacts of the U-228 and U-183 connectors in such a manner that the face of the contacts shall be
depressed .080 inches from the normal plane of the face of the contact. The force required to accomplish
this shall be recorded. Second, a test jig shall be used that will permit the depression of each individual
contact. Each contact in turn shall be depressed .080 inches from the normal plane of the contact face
and the depression force required shall be recorded. The forces required shall be in accordance with
3.6.1. At the conclusion of contact depression measurements, the contact resistance of each contact
shall meet the requirements of 3.5.3.
4.8.2 Air pressure. To detect leakage, a pressure of 2.5 pounds per square inch shall be applied to the
contact face and then to the rear of the plug or receptacle, using the differential leakage tester described
on figure 1, or an equivalent method approved by the qualifying activity (see 3.6.2).
4.8.3 Mating action. The connector shall be mated and unmated 3000 times with the applicable
mating connector at the rate of not more than 30 mating cycles per minute (see 4.9.8.1). The connector
shall be examined for mechanical damage and then tested for contact resistance, air pressure, and
dielectric in accordance with 4.7.3, 4.8.2 and 4.7.1 respectively, as applicable. Failure of any of these
tests shall constitute failure of the mating action test. Failure of the sample connector due to failure of the
applicable mating connector shall invalidate the test. The mating connector shall not be used for more
than one mating action test (see 3.6.3).
4.8.4 Contact retention. An axial load shall be applied to the individual contacts of the sample
connector with all contacts in place and the insert mounted in the shell. The load shall be applied
uniformly at a rate of approximately one (1) pound per second. The load shall be applied first in one
direction and then in the opposite direction, except for spring loaded contacts, where the load need be
applied in one direction only, at the terminal end tending to push the contact inward. Contacts shall meet
the requirements of 3.6.4.
14
For Parts Inquires submit RFQ to Parts Hangar, Inc.
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business