MIL-DTL-641F
b. Initial measurements The insulation resistance shall be measured as specified in 4.6.3.
c. Subcycle Cord-mounting jacks shall not be subjected to steps 7a and 7b; they shall remain in the humidity
chamber until the next cycle begins.
d. Polarization voltage Polarization voltage shall be applied between at least one pair of mutually insulated
terminals of 50 percent of the jacks. No potential shall be applied to the remaining 50 percent of the jacks.
e. Final measurements:
1. At high humidity Insulation resistance shall be measured as specified in 4.6.3.
2. After drying period The jacks shall 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
4.6.8 Vibration, high frequency (see 3.6.7). Jacks shall be tested in accordance with method 2005 of EIA364.
The following details and exceptions shall apply:
a.
Method of mounting: Jacks shall be mounted with their longitudinal axis in a horizontal plane.
b.
Test condition: I.
c.
Direction of motion: Along the axis of the jack, and then perpendicular to the axis of the jack.
d.
Measurements during vibration: Each jack shall be monitored for electrical continuity, using a test current
of 100 ±2 milliamperes, dc. Loss of continuity for a period longer than 10 microseconds constitutes a
failure.
e. Measurements after vibration: Contact resistance shall be measured as specified in 4.6.2.
f. The vibration test shall be performed on jacks, both unmated (without the mating plug) and mated (with
the mating plug).
g. Mating plug: The applicable mating plug (see table IV) shall have a 3-foot ±3 inch length of cord, of the
type normally used with the plug, attached and hanging free. The mating plug shall be inserted into the
jack and shall remain inserted in the jack throughout the mated portion of the test.
4.6.9 Shock (specified pulse) (see 3.6.8). Jacks shall be tested in accordance with method 213 of MIL-STD-
202. The following details shall apply:
a. Mounting Jacks shall be mounted on a vertical test plate.
b. Test condition letter M.
The test shall then be repeated with the jacks mounted on a horizontal plate.
4.6.10 Spring life (see 3.6.9). The specified test plug (see 3.1) conforming to the applicable figure (see figures
1 to 7 inclusive) shall be used. The plug should be lubricated, but the lubricant shall be removed from the plug
and jack at the completion of the last cycle of insertion and withdrawal. The jacks shall be subjected to 5,000
cycles of complete insertion and withdrawal of the plug. The jacks shall then be examined for damage and
loosening of parts, after which the insertion and withdrawal forces, dielectric withstanding voltage, and contact
resistance shall be tested as specified in 4.6.5, 4.6.4, and 4.6.2, respectively. The jacks shall then be subjected
to an additional 5,000 cycles of complete insertion and withdrawal of the plug and then shall be examined for
damage and loosening of parts, after which the contact resistance shall be tested as specified in 4.6.2. For
qualification inspection, the rate of cycling shall not exceed 600 cycles per hour. For quality conformance
inspection, the rate of cycling may be 1,200 cycles per hour.
4.6.11 Water seal (see 3.6.10). The jacks shall be mounted by normal mounting means at a depth of 6 feet in
a tank, with the body of the jacks outside the tank and the bushing end of the jacks within the tank. The jacks
shall then be subjected to a 6-foot minimum head of water (in the tank) for a period of 24 hours.
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