MIL-R-5757J
4.6.8.1.2 Contact voltage drop (see 3.10.1). 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 load: Test current shall be rated resistive current at rated voltage or less. See 6.1.1 for low level voltage rating. If a lower test current is used, the millivolt drop shall be adjusted according to Ohm's law.
c. Post test loads for intermediate current and life: When intermediate current is specified in the grouping, the same current as intermediate current, or 100 mA, at a voltage equal to or below rated voltage shall be used. When life tests are specified in the grouping, the same current as the high level life test, or 100 mA, at a voltage equal to or below rated voltage shall be used. If a lower test current is used, the millivolt drop shall be adjusted according to Ohm's law.
d. Points of measurements:
(1) Between all normally closed mated contacts.
(2) Between all normally open mated contacts, with the coil energized with rated coil voltage (or current) for non-latch type relays, or in the latch/reset position for magnetic latch type relays, with or without coil energized.
e. Number of activations prior to measurement: During contact voltage drop tests, the number of activation prior to measurement is none.
f. Number of test activations: Maximum of three activations in each closed contact position for qualification Q1.
For all remaining groups in the Qualification table, group A, group B, and group C, one activation in each closed contact position.
g. Number of measurements per activation: One in each closed contact position. The readings shall be taken after the circuit has stabilized and within a maximum time of 2 seconds after activation.
4.6.8.2 Specified pickup, hold, and dropout values (voltages) (or current) (see 3.10.2). Specified pickup, hold, and dropout values (voltage) shall be measured as specified in 4.6.8.2.1, 4.6.8.2.2, or 4.6.8.2.3. For qualification inspection, the relay shall be mounted in each of three mutually perpendicular planes, unless otherwise specified (see
3.1). For quality conformance inspection, mounting position is optional. A suitable indicating device shall be used to monitor contact position. During the test, all contacts shall not change state (break or remake) when the coil is
energized at or above the specified pickup value (voltage); when the coil voltage (or current) is lowered to any value
at or above specified hold value (voltage); or when the coil voltage (or current) is reduced from the specified dropout value (voltage) to zero. It is permissible to perform specified pickup, hold, and dropout values (voltages) using step
function voltage changes as specified in 4.6.8.2.1, 4.6.8.2.2, and 4.6.8.2.3. Due to the fact that slow ramping will overheat relay coils and vary specified pickup, hold, and dropout values (voltages), the step function method shall be the governing method in cases of dispute.
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