MIL-DTL-2212K(SH)
4.6.4.2 Pressure switches. Pressure switch setpoints shall be adjusted to 50±5 percent of the range. Pressure
switches shall be actuated at 5-Hz intervals (5, 10, 15, and so forth) during the test and shall perform as specified in
3.17.2.3. At each frequency of vibration, pressure shall be applied to the pressure switch and shall be varied over
the specified operational interval. Pressure switches with ranges less than or equal to 100 psig shall be operated
between 10 percent above the setpoint and 10 percent below the reset point; pressure switches with ranges greater
than 100 psig shall be operated between 5 percent above the setpoint and 5 percent below the reset point.
Performance shall conform to 3.17.2.3. Post-test reference measurements without adjustments shall verify retention
of the pre-test setpoint and conformance to the requirements of 3.16.6.1.
4.6.4.3 Temperature switches. Temperature switch setpoints shall be adjusted to 50±5 percent of the range.
Temperature switches shall be actuated at 5-Hz intervals (5, 10, 15, and so forth) during the test and shall perform as
specified in 3.17.2.4. The temperature of the applied actuating medium need not be measured, but should not
exceed the switches maximum temperature. Hot air guns and vortex tubes are recommended. Post-test reference
measurements without adjustments shall verify retention of the pre-test setpoint and conformance to the
requirements of 3.16.6.2.
4.6.5 Shock. Shock tests shall be conducted in accordance with MIL-S-901 to determine conformance to
3.17.3. A separate unit may be used for each set of nine shock blows. Tests shall be performed under light,
medium, or heavy weight classifications, as required. Controllers, contactors, and electrically operated associated
switching devices shall be shock tested in the de-energized and each of the normal energized conditions.
Momentary contact associated switching devices such as push-button switches and spring return lever switches shall
be tested in the normal position (not actuated). Other associated switching devices that may remain in more than
one position shall be tested with contacts actuated and not actuated. Specific electrical tests (insulation resistance,
dielectric, and pickup and dropout) shall be made as necessary to determine satisfactory performance following the
shock test. For controllers and associated switching devices mounted separately on the ships structure, MIL-S-901
bulkhead fixtures shall be used (Fixture 4A mounting for lightweight tests). For individual controller components,
Fixture 6E of MIL-S-901 shall be used. Equipment shall be mounted on the shock machine in a manner simulating
normal shipboard mounting. The following are definitions of failure:
a. Breaking or cracking of any part, including mounting bolts, or material around the mounting holes that will
affect device function.
b.
Failure to pass insulation resistance tests.
c.
Failure to pass pickup and dropout tests for individual contactors and relays.
d.
Failure to pass voltage variation tests for controllers.
e.
Failure to pass dielectric tests.
f.
Failure to pass the visual examination shall be cause for rejection.
g.
Appreciable distortion of any parts, including enclosure and framework.
h.
Failure to meet the shock requirements specified in 3.17.3.
i.
Any change of state of a controller, contactor, or associated switching device.
4.6.5.1 Contact monitoring. On shock tests of components, each contact shall be monitored. Assembled
controllers shall have at least one contact set on each device monitored, including one line contact; the recorded
data, with the exception of line contacts, shall be for qualitative determination of devices responsible for controller
malfunction should it occur. The contacts of equipment undergoing shock tests shall be connected to the monitoring
equipment specified in 4.6.5.1.1 through 4.6.5.1.3. For electronically-based control circuit devices and associated
switching devices, shock tests shall be conducted with all inputs and outputs operating and monitored to ensure that
they do not change state. Shock tests shall be repeated for each network protocol port that is available for the
device. Network status and/or operational commands shall be continuously executed to the device to ensure that
network communications are properly operating during the entire test.
4.6.5.1.1 Monitoring of AC line contacts. The closed and open line contacts of AC controllers and contactors
shall be monitored. Performance shall be as specified in 3.17.3a.
4.6.5.1.2 Monitoring of DC line contacts. The closed and open line contacts of DC controllers and contactors
shall be monitored. Performance shall be as specified in 3.17.3b.
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