MIL-DTL-13718F
4.5.3 Terminal torque resistance test (external). To determine conformance to 3.4.1,
with relay mounted as in intended use, a force of 25 in-lb of torque shall be applied at base of
terminal for one minute.
4.5.4 Connector strength test. To determine conformance to 3.4.2, with relay mounted
as in intended use, a load of 20 lb shall be applied gradually to connector in direction away from
relay housing.
4.5.5 Dielectric withstanding voltage test. To determine conformance to 3.4.3, relay
shall be subjected to the following procedures. Applied voltage shall be 500 volts rms, at a
frequency of 60 cycles per second (Hz), for 60 seconds between each terminal, and between each
contact terminal and each coil terminal. Voltage shall be applied, and reduced, at a maximum rate
of change of 250 volts per second. Relay shall subsequently be subjected to test specified
in 4.5.8.
4.5.6 Pickup voltage test. To determine conformance to 3.4.4, after relay has been
temperature stabilized, relay shall be energized several times until stability of pickup voltage
readings indicates that residual magnetism has built up to normal value. Relay shall then be tested
for 10 cycles (deenergize and energize) to determine that energized function is completed when a
potential not in excess of pick-up voltage specified on the applicable drawing is applied. A suitable
indicating device shall be used to determine that contacts operate satisfactorily. Upon
completion, test shall be repeated in turn at ambient air temperatures specified in 4.2.1.1
and 4.2.1.2.
4.5.7 Dropout voltage test. To determine conformance to 3.4.5, after it has been
temperature stabilized, relay shall be energized with 28 Vdc. Voltage shall then be reduced.
Relay shall release to deenergized position within limits of dropout voltage as specified on
applicable drawing. The above shall be repeated for 10 cycles. A suitable device shall be used to
determine that contacts operate satisfactorily. Upon completion, test shall be repeated in turn at
ambient air temperatures specified in 4.2.1.1 and 4.2.1.2.
4.5.8 Contact voltage drop test. To determine conformance to 3.4.6, after it has been
temperature stabilized, relay shall be subjected to rated ampere load through contacts, and
28 Vdc on coil. Voltage drop across contact terminals shall be measured within 10 seconds after
contact close. Contacts shall be caused to break, and then to make, verify load current before
each voltage drop measurement. Average of 10 consecutive and individual readings shall be
recorded.
4.5.9 Overload test. To determine conformance to 3.4.7, after it has been temperature
stabilized, relay shall be energized with 28 Vdc. Minimum voltage at contacts under load shall be
24 volts. Relay shall be subjected to following overload test.
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