MIL-DTL-24552B(SH)
insulation resistance test of 4.7.2. Failure of these tests or evidence of
mechanical damage as specified in 3.6.6 shall be cause for rejection.
4.7.7 Contact resistance. Mated terminals and test plugs shall be
connected to a power supply and circuitry as needed to pass 100 amperes
through each contact during the test. Test leads shall be not less than 5
feet. A potential drop greater than that specified in 3.6.7, when measured at
the extreme ends of the contacts (see figure 1), shall be cause for rejection.
4.7.8 Humidity. Mated plugs and terminal shall be subjected to a
moisture resistance test in accordance with method 103, condition C of MIL-
STD-202. Upon completion and after a 4-hour drying period, the plugs and
terminal shall be subjected to the tests of 4.7.1 and 4.7.2. Boot (plug) shall
be subjected to a hardness test in accordance with ASTM D 2240 prior to and
following the humidity test. Change in shore A hardness greater than specified
in 3.5.5 shall be cause for rejection.
4.7.9 Fluid immersion. One plug shall be immersed fully for a period
of 20 hours at 60 + 20C in fuel oil in accordance with MIL-F-16884 and one in
turbine fuel in accordance with MIL-PRF-5624. Plugs shall be wiped free of the
fluids and connected to a terminal to determine proper mating as specified in
3.6.9.
4.7.10 Electrical load. Two plugs shall be mated to a terminal as
shown on figure 2, and each plug lead shall be connected to a 100-ampere load.
A power supply capable of supplying 200 amperes through all phases
simultaneously shall be connected to the terminal bus bar. The test current
shall be applied for 4 hours. Upon completion of the test, the terminal and
plug shall be subjected to the tests of 4.7.1 and 4.7.2.
4.7.11 Endurance (durability). Plugs and receptacles shall be
subjected to the durability test in accordance with method 2016 of MIL-STD-
1344 to meet the requirements specified in 3.6.11. The following details shall
apply:
a.
Number of mating and unmating cycles: 500.
b.
Cycle rate: 5 cycles per minute minimum.
c.
Plug retention devices may be removed for this test.
d.
Rejection criteria: Evidence of damage in accordance with method 2016
of MIL-STD-1344 or failure to be as specified in 3.6.7.
4.7.12 High-impact shock. The terminals or switch, with plugs mated as
indicated, shall be energized and subjected to high-impact shock tests in
accordance with MIL-S-901 for grade A, class I, lightweight, type A equipment.
The manner on mounting shall simulate the actual mounting on shipboard.
Connections shall be as follows:
a. Bulkhead terminal (see figure 3) - Three plugs, each with 6- to 10-
foot lengths of unsupported cable attached, installed to one side.
One plug, with a 6- to 10-foot length of unsupported cable attached,
and two covers installed on the opposite side.
b. Terminal risers - Two plugs, each with a 6- to 10-foot length of
unsupported cable attached, and two covers installed on the opposite
side.
c. Switch - Two plugs, each with a 6- to 10-foot length of unsupported
cable attached.
The sample being tested shall not be reconditioned or adjusted during the
testing. Following the test, the samples shall be subjected to tests of 4.7.1
and 4.7.2. The items tested shall be considered as failing the test if damage
specified in 3.6.12 is evident, or if they fail to pass the tests specified in
4.7.1 and 4.7.2.
4.7.13 Mechanical abuse (impact). A cabled plug shall be subjected to
the test in accordance with method 2015 of MIL-STD-1344 to verify compliance
11
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business