MIL-R-5757J
4.6.16 Coil life (unless otherwise specified, see 3.1) (see 3.18). Relays shall be tested for 1,000 hours as follows
(see figure 9).
a. Relays may be mounted as specified in 4.2.5. Each contact terminal shall be connected as specified in
4.6.8.1a.
b. During the maximum temperature portion of the test, rated coil voltage (or current) (see 3.1) shall be applied continuously and at least half of the normally open contacts shall carry rated current. During room temperature and minimum temperature exposures, the coil shall be de-energized and contacts shall not be loaded. Ambient temperatures shall be varied as shown on figure 9, with heating and cooling rates not to exceed +1°C per second average. The portion of the cycle run at minimum temperature shall be approximately 10 percent of the test cycle time.
c. After the first 100 hours, and while still at the low temperature extreme, static contact resistance (or voltage drop) (4.6.8.1) and operate and release time (4.6.8.4) shall be measured as specified and the value recorded. Measurements of coil resistance (or coil current as specified, see 3.1 and 4.6.8.3) and static
contact resistance (4.6.8.1) shall be taken at room temperature initially, then again after 250 hours ±25 hours,
500 hours ±25 hours, and 750 hours ±25 hours and the values shall be recorded. Specified pickup, hold, and dropout values (voltages) measurements shall be made as specified in 4.6.8.2 during the last temperature cycle after allowing the relay to stabilize, de-energized, at each of the temperature extremes, and the values
shall be recorded.
Measurements of coil resistance (or coil current) as applicable (see 3.1), and static contact resistance as specified in 4.6.8.1 shall be taken at room temperature initially, then again after 125 hours ±12.5 hours, 250 hours ±12.5 hours, and 375 hours ±12.5 hours and the values shall be recorded.
d. After the relay(s) have been subjected to the coil life temperature cycles, measurements shall then be taken at room temperature of dielectric withstanding voltage (4.6.7.1), insulation resistance (4.6.6), static contact resistance (4.6.8.1), coil resistance (or coil current) (4.6.8.3), operate and release time (4.6.8.4), and contact bounce (4.6.8.5.1).
e. Examination after test: As specified in 4.6.10e.
4.6.17 Resistance to soldering heat (see 3.19). Relays shall be tested in accordance with method 210 of
MIL-STD-202. The following details and exceptions shall apply:
a. Depth of immersion in molten solder: Within .060 inch ±.020 inch (1.52 mm ±0.51 mm) of the relay base. b. Test condition: B.
c. Measurements after test: Insulation resistance (4.6.6), static contact resistance (4.6.8.1), specified pickup, hold, and dropout values (voltage or current)(4.6.8.2), and coil resistance (or coil current as specified; see 3.1 and 4.6.8.3) shall be measured as specified.
d. Examination after test: As specified in 4.6.10e.
4.6.18 Salt spray or salt atmosphere (corrosion), MIL-STD-202 (see 3.20). Relays shall be tested in accordance with method 101 of MIL-STD-202 unless otherwise specified (see 3.1). The following details and exceptions shall apply:
a. Applicable salt solution: 5 percent. b. Test condition: B.
c. Examination after test: Relays shall be examined for evidence of peeling, chipping, blistering of the finish, and exposure of base metal due to corrosion that can adversely affect the operation or performance of the relay.
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