MIL-DTL-27599D
be measured from solid reference points on the connector halves. The mating operation shall then be
continued until the connector halves are in the completely mated position. A second overall length
measurement shall then be taken from the same reference points. The difference of these two
measurements shall be not less than specified in 3.22. Both the outer shield and inner conductor circuits
shall be included in the test of shielded contacts.
4.6.12 Coupling pin strength (see 3.14). One coupling pin in each receptacle shall be subjected to 50
+5, -0 pounds load applied to the swaged end along the major axis of the coupling on swaged pins, and
perpendicular to the pin centerline on the exposed portion of welded or brazed pins. A steel test tip shall
be used for application of the load on swaged pins. A steel test fixture contoured to the shape of the
coupling pin shall be used for application of the load on the welded or brazed pins.
4.6.13 Vibration (see 3.15). Wired, potted, and mated connectors shall be subjected to the vibration
test procedure EIA 364-28, condition III except that the duration shall be one hour in each plane.
Receptacles shall be mounted on the vibration fixture by normal means. All contacts shall be wired in a
series circuit, and 100-150 milliamperes of current shall be allowed to flow through the series circuit
during vibration. Suitable means shall be employed to monitor the current flow and to indicate any
discontinuity of more than 1 microsecond. The wire bundle shall be clamped to non-vibrating points at
least 8 inches from the rear of the connector.
4.6.14 Shock (see 3.16). Wired, potted, and mated connectors shall be subjected to an approximate
half sine wave pulse of 300 g ± 15 percent with a duration of 3 ± 1 milliseconds, once in each direction in
each of three mutually perpendicular axes (total of six shocks). Receptacles shall be mounted on a shock
fixture by normal means. All contacts shall be wired in a series circuit and 100-150 mA of current shall be
allowed to flow through the series circuit during shock. Suitable means shall be employed to monitor the
current flow and to indicate any discontinuity of more than 1 microsecond. The wire bundle shall be
clamped to fixed points at least 8 inches from the rear of the mated connectors, evidence of cracking,
breaking, or loosening of parts shall be cause for rejection.
4.6.15 Shell-to-shell conductivity (see 3.17). Mated connectors shall be subjected to the test specified
in test procedure EIA 364-83.
4.6.16 Humidity (see 3.18). Wired, mated connectors shall be subjected to the humidity test specified
in test procedure EIA 364-31. The following details and exceptions shall apply:
a. The mated connectors shall be mounted in a vertical position.
b. Step 7 (a) shall be performed during the last cycle.
c.
Three hours minimum after the start of step 7 (a) during the final cycle and while the
connectors are still subjected to high humidity, the insulation, resistance shall be measured
when the chamber temperature reaches 20ºC ± 5ºC and condensation is observed on the
connector.
d. For qualification testing, insulation resistance readings shall be made on a minimum of 50
percent of the circuits. Outer circuits shall be measured to the connector shell.
4.6.17 Shell spring finger forces (see 3.19). Plugs shall be completely mated and unmated 10 times
with counterpart receptacles less coupling pins (if applicable) and inserts. On the mating of the first cycle,
the forces necessary to engage the connectors shall be within the values specified in table II. On the
unmating of the last cycle, the forces necessary to separate the connectors shall be within the value
specified in table II.
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