MIL-PRF-55339C
a.
Remove contacts C2 � C3 from the measuring circuit.
b.
Close switch (SW).
c.
Adjust resistor (R2) for a voltmeter (VM) reading of 50 millivolts.
d.
Connect contacts C2 � C3 to the measuring circuit.
e.
Check to see that the voltage drops significantly prior to opening the switch in (f).
f.
Open switch (SW).
g.
Adjust resistor (R1) for a circuit current of 1 ampere.
h.
Measure the voltage drop across contacts C1 � C4 and call this "e".
i.
Compute contact resistance as follows:
Contact resistance (milliohms) = e (in millivolts) �1 ampere.
A � Ammeter (0-1 ampere)
R1 � Variable resistor (0-15 ohms).
Sw � Switch (contact resistance <.01 ohm).
R2 � Variable resistor (0-0.1 ohm)
Vm � Voltmeter.
Power supply � DC 10 volts at 1 ampere.
FIGURE 6. Diagram for contact resistance.
4.5.15 Vibration, high frequency (see 3.18 ). The mated adapter shall be tested in accordance with
method 204 of MIL-STD-202. The following details and exceptions shall apply: Contacts may be
connected in series.
a. Mating connector � Cabled connector in accordance with MIL-PRF-39012.
b. Mounting of specimens � The adapter shall be mounted by its normal mounting device and
engaged by its normal coupling mechanism; safety wire shall not be used. Adapters having
no provisions for mounting may be held to the jig (see figure 7) by a suitable clamp.
c. Electrical load � At least 100 milliamperes shall be flowing through each set of contacts.
d. Test condition � B.
e. Measurements � During vibration, continuity of the center and outer contacts shall be
monitored with a detector capable of detecting interruptions of 1 microsecond or greater
duration.
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