MIL-DTL-642E
TABLE IV. Plugs and mating jacks. Continued.
Plugs
Jacks
Part number
Type designation
Part number
Type designation
M641/19-1
M642/13-1
PJ-711
thru
M642/13-2
PJ-711
M641/19-12
M642/13-3
PJ-778
M641/20-1
M642/13-4
PJ-778
thru
N/A
M641/20-8
M641/21-1
thru
M641/21-12
M642/14-1
U-384/U
M641/22-1
U-385/U
1/ Types PJ-054B and PJ-054R can be replaced by types PJ-540B and PJ-540R, respectively.
The cord-entrance dimension for PJ-054B and PJ-054R is 0.250 inch, for PJ-540B and
PJ-540R, the cord-entrance dimension is 0.281 inch.
2/ Two JJ-086 are needed for use with PJ-327.
4.6.5 Insulation resistance (see 3.6.4). Plugs shall be tested in accordance with method 302 of MIL-STD-
202. The following details shall apply:
a. Special preparation Use applicable test jack (see 3.1).
b. Electrification time Shall not exceed one minute.
c. Test condition letter B.
4.6.6 Moisture resistance (see 3.6.5). Plugs shall be tested in accordance with method 106 of MIL-STD-
202. The following details and exceptions shall apply:
a. Mounting Polyvinylchloride-insulated wires conforming to type MW of MIL-W-76 shall be
connected in the normal manner to the plug terminals. The plugs shall then be held in an
approximately vertical position, with the finger pointed upward, by means of a nylon cord
fastened to the sleeve, or by other suitable means simulating this condition.
b. Initial measurements The insulation resistance shall be measured with a direct-current
potential of 500 volts applied between mutually insulated terminals of the plugs. The dielectric
withstanding voltage shall then be measured as specified in 4.6.3.
c. Subcycle (steps 7a and 7b) Not applicable.
d. Polarization A direct-current potential of 100 volts shall be applied between the terminals on
50 percent of the plugs. For plugs having tip-and-sleeve connections, the sleeve shall be
negative, and the tip positive. For plugs having tip-ring-and-sleeve connections, the sleeve
and tip shall be negative and the ring positive. No potential shall be applied to the remaining
50 percent of the plugs.
e. Final measurements After completion of step 6 of the final cycle and not sooner than ½-hour
nor later than 3 hours after the sample plugs shall have been removed from the chamber the
insulation resistance shall be measured as specified in 4.6.5. The plugs shall then be
conditioned at a relative humidity of 50 ± 5 percent for 24 hours, after which the insulation
resistance, contact resistance and dielectric withstanding voltage shall be measured as
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