MIL-DTL-2212K(SH)
4.6.18.1 Transient voltage.
4.6.18.1.1 Upper limit. With the equipment operating at nominal frequency (60 Hz) and the upper limit of the
steady-state voltage (+5 percent [three-phase], +10 percent [single-phase]), the voltage shall be increased to the
maximum positive transient voltage (+20 percent) and then decreased back to the upper limit steady-state voltage in
a 2-second period (for example, for 440 V, three-phase, the voltage will be at 462 and the transient will be to 528).
4.6.18.1.2 Lower limit. With the equipment operating at nominal frequency (60 Hz) and the lower limit of the
steady-state voltage (-5 percent [three-phase], -10 percent [single-phase]), the voltage shall be decreased to the
maximum negative transient voltage (-20 percent) and then increased back to the lower limit steady-state voltage in
a 2-second period (for example, for 440 V, three-phase, the voltage will be at 418 and the transient will be to 352).
4.6.18.2 Transient frequency.
4.6.18.2.1 Upper limit. With the equipment operating at nominal voltage and the upper limit of the steady-state
frequency, 61.8 Hz, the frequency shall be increased to the maximum positive transient frequency, 63.3 Hz, and then
decreased back to the upper limit steady-state frequency in a 2-second period.
4.6.18.2.2 Lower limit. With the equipment operating at nominal voltage and the lower limit of the
steady-state frequency, 58.2 Hz, the frequency shall be decreased to the maximum negative transient frequency,
56.7 Hz, and then increased back to the lower limit steady-state frequency in a 2-second period.
4.6.19 Spike voltage. Equipment shall be subjected to the voltage spike test as specified in
MIL-STD-1399-300. Equipment shall not malfunction or change state of operation when tested as specified herein.
Equipment shall be tested in both the energized and de-energized operational modes. Equipment with more than
one energized operational mode shall be operated in the mode selected by the testing activity to be the most likely to
be affected by the test conditions or the mode used predominantly in service.
4.6.20 Power interruption. Equipment shall be operated at nominal voltage and frequency. The total electrical
input power shall be interrupted and reapplied in a randomly short period (less than 25 milliseconds). The
equipment shall continue to operate properly. Equipment specified to continue operation during power interruptions
greater than 1 second shall be then operated long enough to detect any performance degradation, the power shall be
interrupted for a period of 30 seconds or the specified recycle time, and then reapplied. During these tests, and as a
result of these tests, no damage or malfunction shall occur. The examination and general operation test shall
confirm proper equipment performance upon completion of this test (see 4.5). For equipment with more than one
energized operational mode, the power interruption test shall be performed in each of the modes.
4.6.21 Leakage current. Assembled controllers and stand-alone devices shall be subjected to the leakage
current tests specified in MIL-HDBK-2036 and shall meet the requirements of 3.17.11.5.
4.6.22 Output leakage current. Apply the rated voltage to the device under test and adjust the load to obtain the
rated resistive current, ±5 percent. Place the device in the OFF-state and measure the output leakage current in each
output circuit. The leakage current in the output circuits of solid-state switching devices shall not exceed the values
specified in 3.17.11.6.
4.6.23 Output voltage drop. Apply the rated output voltage and rated frequency to the device under test. Place
the device in the ON-state (conducting) and adjust the load to obtain rated resistive current, ±5 percent. With a
voltmeter or oscilloscope connected across the device output terminals, measure the output voltage drop (volts
peak). The ON-state output voltage drop of solid-state switching devices shall meet the requirements of 3.17.11.7
and not exceed the values listed in table X.
4.6.24 Pressure and temperature switch setpoint repeatability. Pressure switches shall be set to 5, 20, 40, 60,
80, and 95 percent of their pressure range; all setpoints shall be ±3 percent of range. At each setting the pressure
switch will be operated five times. These readings shall be conducted before and after the endurance test. The last
pre-endurance test setpoint for each setting shall be used as the first post-endurance test setpoint for that setting.
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