MIL-DTL-25955A
4.6 Methods of examination and test.
4.6.1 Dielectric withstanding voltage, sea level test (see 3.6.1). Connectors shall be tested in
accordance with MIL-STD-202, method 301. For test purposes, the applicable test voltage shall be
applied between the two closest contacts and between the shell and the contact or contacts closest to the
shell. If an insert contains more than one voltage or service rating, similar connections shall be made for
the different test voltage necessary.
4.6.1.1 Dielectric withstanding voltage, altitude test (see 3.6.1.1). Connectors shall be placed in a
suitable chamber at room temperature under the conditions listed below. The chamber ambient shall be
reduced to that specified. After a period of 30 minutes at the simulated altitude, the connectors shall be
tested in accordance with MIL-STD-202, method 301. The applicable test voltage shall be applied for test
purposes between the two closest contacts and between the shell and the contact or contacts closest to
the shell. If an insert contains more than one service rating, similar connections shall be made to apply
the applicable test voltage to the different groups of voltage rated contacts.
a.
All grommeted and engaged for first test.
b.
One half of each type, style, etc. connector fully wired with AWG 20 wire.
c.
Remainder of connectors fully wired with AWG 24.
d.
Wire need not be bundled but may be separated.
e.
Following test engaged, connectors shall be disengaged and the test repeated employing the
applicable test voltage.
4.6.2 Insulation resistance test (see 3.6.2). Connectors shall be tested in accordance with
MIL-STD-202, method 302, test condition B. For test purposes, the resistance shall be measured
separately between the closest pair of contacts and between the shell and a contact closest to the shell.
4.6.3 Thermal shock test (see 3.6.3). Connectors shall be subjected to five continuous cycles of
temperature change. The two temperature extremes specified shall form the limits of the cycle. The first
exposure shall be from room temperature to the low extreme. The connectors shall be maintained at
each extreme for a minimum period of 30 minutes in each cycle. The connectors shall be transferred
from one chamber to the other for the temperature changes. The time of exposure to room temperature
shall not exceed 2 minutes during each transfer. Exposure to low temperature, then high shall form one
cycle. At the completion of the last cycle, the connectors shall be returned to room ambient conditions for
inspection and further tests specified.
4.6.4 Vibration test (see 3.6.4). Connectors shall be tested in accordance with MIL-STD-810 and the
following details: A receptacle shall be mounted on a vibration table. The vibration of the receptacle shall
be monitored by a suitable sensor at a point on the fixture near a receptacle support point or on the
receptacle itself. Counterpart plugs shall be engaged with the mounted receptacles and held by normal
locking means only. No safety wire shall be employed. All contacts shall be wired in a series circuit and
at least 100 milliamperes of current shall be allowed to flow through that series circuit during vibration. A
recording voltmeter or suitable equivalent shall be employed to monitor the current flow and to indicate
any discontinuity of contact or interruption of current flow. The wire bundles or cable shall be clamped to
non-vibrating points at least 8 inches from the rear of the connectors. The clamping length may be
selected or changed to avoid resonance of the cable or wire.
22
For Parts Inquires submit RFQ to Parts Hangar, Inc.
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business