MIL-R-5757J
4.6.8.2.1 Specified pickup value (voltage). The voltage shall be increased from zero until the relay operates, and the specified pickup value (voltage) shall be measured. It is permissible to perform specified pickup value (voltage) using a step function voltage change as follows and as illustrated on figure 6.
a. Step up to the maximum specified pickup value (voltage), contacts should have transferred and all normally-open contacts should be made.
b. Increase to rated coil voltage (or current).
c. Step down to specified hold value (voltage). Normally-open contacts must still be making.
d. Step down to specified dropout value (voltage), all contacts should have transferred and all normally-closed contacts should be making.
e. Step down to zero voltage.
4.6.8.2.2 Specified hold value (voltage). Rated voltage (or current) shall be applied to the coil. The voltage shall then be reduced to the specified hold value (voltage) (see 3.1 and 6.8). All contacts shall not change state. It is permissible to perform this test using the step function voltage program described in 4.6.8.2.1 and figure 6.
4.6.8.2.3 Specified dropout value (voltage). Rated voltage (or current) shall be applied to the coil. The voltage shall then be gradually reduced until all contacts return to the de-energized position and the specified dropout value (voltage) shall be measured. It is permissible to perform this test using the step function voltage program described in 4.6.8.2.1 and figure 6.
4.6.8.3 Coil resistance (or coil current) (see 3.10.3).
4.6.8.3.1 Coil resistance (or coil current) (see 3.10.3.1). Relay coils shall be tested in accordance with method 303 of MIL-STD-202.
4.6.8.3.2 Coil current (when specified, see 3.10.3.2). When rated voltage (or current) is applied to the coil terminals, the current must be within the limits as specified (see yy). Apply rated voltage
(or current) for 5 seconds maximum.
y Operate and release time (see y). Operate and release time of all contacts shall be measured using an oscilloscope or other acceptable means approved by the qualifying activity. Rated voltage (or current) shall be applied to the coil. Contact load conditions shall be 6 V dc maximum or peak ac at 10 mA maximum. The circuit shown on y, or equivalent, shall be used. The operate and release time shall be exclusive of contact bounce or contact stabilization time. Timing measurements shall be made on all contact sets. Release time is not applicable to latching relays.
y Break before make (see y). The circuit shown on yy or an equivalent circuit approved by the qualifying activity shall be used to monitor contact position.
FIGURE 5. Typical break before make test circuits.
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