MIL-DTL-25879G
4.7.2 Operating voltage test (see 3.3.1). The voltage necessary for positive operation of the switch shall be
measured using a calibrated voltmeter. The pull-in voltage shall be considered to be the voltage required to operate
the switch in 0.1 second or less, after closing the primary power circuit. Satisfactory operation shall be accomplished
under the following conditions:
Voltage limit
Temperature
-55C
24 V to 29 V
+20C
19 V to 29 V
4.7.3 Operating current (see 3.3.2). The operating current at +20C (± 5C) shall not exceed .5 A dc at 25 V for
one solenoid and 1 A dc for both solenoids simultaneously. The switch shall be designed to permit the negative side
of the power input source to be grounded externally.
4.7.4 Switching rate (see 3.3.3). The switch shall provide the performance specified herein when switching at
rates up to 140 times per minute.
4.7.5 Switching time (see 3.3.4). Switching time shall be measured using an oscilloscope or other acceptable
means approved by the acquiring activity (see 6.3). The trace shall show contact switching at operate and release
and appropriate timing markers. Rated voltage shall be applied to the coil. High level contacts shall be loaded at 100
mA at 28 V dc. Contact bounce shall be measured at 100 mA at 28 V dc. A contact bounce shall be considered any
occurrence equal to or greater than 90 percent of the open circuit voltage with a pulse width of 10 µs or greater.
Switching time shall be the operate and release time inclusive of contact bounce. The circuit shown in figure 2, or
equivalent, shall be used. The test shall be run at +20C (±5C) and at -55C (±5C). The switching times at +20C
(± 5C) for the following positions shall not exceed 20 ms.
a.
Position 1 to position 2.
b.
Position 2 to position 1.
c.
Either position to both ON.
d.
Either position to both OFF.
For each of the operations specified above, at -55C (± 5C), the switching time shall not exceed 25 ms.
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