MIL-DTL-19648E
4.7.3 Electrical characteristics.
4.7.3.1 Contact resistance or contact voltage drop (see 3.6.1). Relays shall be tested in accordance
with method 307 of MIL-STD-202. The following details shall apply:
a. Method of connection - Connection jigs or other suitable means.
b. Test current:
(1) Normal bridge current if Kelvin bridge is used.
(2) Maximum rated current if voltmeter-ammeter method is used.
c. Maximum open-circuit test voltage - 25 percent of rated contact voltage, or 6 volts, whichever is
lower.
d. Number of activations prior to measurement - Not applicable.
e. Number of test activations - Three.
f. Number of measurements per activation - One.
4.7.3.1 Static contact resistance or contact voltage drop (see 3.6.1). The static contact resistance or
static contact voltage drop shall be required for each pair of contacts. Each contact must be tested.
4.7.3.1.1 Static contact resistance (see 3.6.1). Relays shall be tested in accordance with method 307
of MIL-STD-202. The following details and exception shall apply:
a. Method of connection: The point of measurement shall be on leads external to the case. Suitable
jigs and fixtures shall be used.
b. Test current:
(1) Normal bridge current if Kelvin bridge is used.
(2) Maximum rated current if voltmeter-ammeter method is used.
c. Maximum open-circuit test voltage - 25 percent of rated contact voltage, or 6 volts, whichever is
lower.
d. Points of measurements:
(1) Between all normally closed mated contacts.
(2) Between all normally open mated contacts.
e. Number of activations prior to measurement: During static resistance tests, the number of
activations prior to measurement is none.
f. Number of test activations: Maximum of three activations in each closed contact position.
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