MIL-DTL-13718F
4.5.9.1 Type I. Relay shall be operated for 50 000 cycles making and breaking a resistive
load equal to 2.5 times normal resistive load rating. Duty cycle shall be 0.2 + 0.05 second on,
20 + 1 seconds off. At conclusion of test, relay shall be subjected to 1 cycle of operation,
energized at foregoing load for a period of 30 seconds. Subsequently, relay shall be tested as
specified in 4.5.8.
4.5.9.2 Type II. Relay shall be subjected to tests specified in 4.5.9.1, except that duty
cycle shall be 1 second on, 60 seconds off.
4.5.10 Endurance test. To determine conformance to 3.4.8, relay shall be energized with
28 Vdc. Minimum voltage at contacts under load shall be 24 volts. Relay shall be subjected to
following endurance test.
4.5.10.1 Type I. Relay shall be operated for 100 000 cycles making and breaking a
resistive load equal to its normal resistive load rating. Duty cycle shall be 0.5 + 0.05 seconds on,
2.5 + 0.l seconds off. One hundred thousand (100 000) cycles of operation shall be conducted at
the following ambient air temperatures:
Number of cycles
Temperature
+160 + 5°F (71.1 + 2.7°C)
25 000
-65 + 5°F (53.8 + 2.7°C)
25 000
+77 + 15°F (25 + 8.3°C)
50 000
Prior to operation at each temperature, relay shall have been stabilized at that temperature for
24 hours. Subsequently, relay shall be tested as specified in 4.5.8.
4.5.10.2 Type II. Relay shall be subjected to test specified in 4.5.9.1, except that duty
cycle shall be 0.5 + 0.05 seconds on, 10 + 0.10 seconds off.
4.5.11 Coil current test. To determine conformance to 3.4.9, after relay has been
temperature stabilized, maximum operating voltage shall be applied to coil terminals and current
flow determined within 10 seconds after application of coil voltage.
4.5.12 Contact bounce and operating time test. To determine conformance to 3.4.10,
measurements of relay closing times and contact bounce at 28 Vdc shall be taken. Time duration
of contact bounce shall be taken from the average of 5 consecutive and individual measurements.
4.5.13 Inductive load test. To determine conformance to 3.4.11, after it has been
temperature stabilized, relay shall be operated for 10 000 cycles in an inductive load circuit. Load
circuit shall have a time constant (time required for the current to reach 63.2 percent of its steady-
state value, found by dividing inductance in henries by resistance in ohms) of 0.026 seconds.
Cycling time shall be as specified in 4.5.9. Subsequently, relay shall be tested as specified in 4.5.8.
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