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MIL-DTL-642 Plugs, Telephone, And Accessory Screws General Specification ForThis specification covers telephone plugs used in telephone \(including telephone switchboard consoles\), telegraph, and teletype circuits, and for connecting headsets, handsets, and microphones into communications circuits.

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. . .
MIL-DTL-642E
4.6.4 Contact resistance (see 3.6.3). Plugs shall be tested in accordance with method 307 of MIL-STD-
202. The following details shall apply:
Method of connection ­ Applicable mating jack (see table IV).
a.
b.
Test current ­ 100 ± 2 milliamperes direct current.
c.
Maximum open-circuit test voltage ­ Approximately 6 volts.
d.
Number of activations prior to measurement ­ Six, using applicable mating jack (see table IV).
e.
Number of test activations ­ One.
f.
Number of measurements per activation ­ Measure between each plug terminal and the
corresponding jack terminal, at the point of normal connection.
9



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