MIL-DTL-2212K(SH)
4.6.5.1.3 Monitoring of auxiliary and associated switching device contacts. The auxiliary contacts of
contactors and the contacts of associated switching devices, when testing individual devices or spare contact sets of
devices within a controller, shall be monitored as follows: Closed and open contacts shall be monitored by
oscillograph, FM tape recorder, or suitable digital data acquisition system. All equipment shall have a minimum
frequency response and sampling rate of 2 kHz. Digital signal processing of acquired data shall be capable of
producing suitable waveform (see 6.8.105) plots with 0.5-millisecond minimum resolution, and for analysis
purposes shall be able to expand contact events with graphical editing to determine voltage levels and time
increments of the individual sample points. Performances shall be as respectively specified in 3.17.3c and 3.17.3d.
4.6.5.2 Time delay relays. Time delay relays shall be adjusted to any convenient setpoint for shock testing.
After each blow, time delay relays will be operated. The set time delay and the setpoint repeatability shall not
change. Setpoint repeatability and variation of the indicated time delay shall conform to 3.16.4.3.
4.6.5.3 Pressure switches. Pressure switch setpoints shall be adjusted to 50±5 percent of the range. Nine
hammer blows shall be applied with the test pressure slightly below the reset point and nine hammer blows shall be
applied with the test pressure slightly above the setpoint. Pressure switches with ranges less than or equal to
100 psig shall be tested at 10 percent above the setpoint and 10 percent below the reset point; pressure switches with
ranges greater than 100 psig shall be tested at 5 percent above the setpoint and 5 percent below the reset point. After
all eighteen blows, pressure shall be varied as necessary to cycle the switch at least three times; tested performance
4.6.5.4 Temperature switches. Temperature switch setpoints shall be adjusted to 50±5 percent of the range.
The sensing bulbs of the temperature switch shall be installed in a suitable mounting adapter possessing temperature
control and monitoring capability. Nine hammer blows shall be applied with the temperature of the mounting
adapter slightly below the reset point and nine hammer blows shall be applied with the temperature of the mounting
adapter slightly above the setpoint. Temperature switches shall be tested at 15 percent above the setpoint and
15 percent below the reset point. After all eighteen blows, the temperature of the mounting adapter shall be varied
as necessary to cycle the switch at least two times; tested performance shall conform to 3.17.3.4. Performance shall
meet the requirements of 3.16.6.2.
4.6.5.5 Post shock tests and examinations. Upon completion of shock testing, the following tests and
examinations shall be performed:
a. Visual examination. Equipment shall be carefully examined to ascertain any mechanical damage.
Equipment shall be disassembled as necessary to detect any damage.
b. Examination and general operation. An examination and general operation shall be performed as specified
in 4.5. Equipment shall operate properly.
c. Insulation resistance. Insulation resistance shall be measured as specified in 4.6.7 and shall meet the
requirements of 3.17.4.
d. Post shock dielectric. A dielectric test shall be conducted as specified in 4.6.8 except that the test voltage
applied will be 65 percent of the specified value and will be applied for 5 seconds. Performance shall meet the
requirements of 3.17.5.
e. Pickup and dropout voltage. When tested individually, contactors and relays, including time delay relays,
shall be tested as specified in 4.6.11 except at ambient temperature between 50 °F and 104 °F (10 °C and 40 °C) and
shall meet the requirements of 3.17.9.
f. Voltage variation. Controllers shall be tested as specified in 4.6.12 and shall meet the requirements of 3.4.1
and 3.4.2.
4.6.5.5.1 Time delay relays. Post-test reference measurements shall verify that the set time delay has not
changed and that setpoint repeatability and variation of the indicated time delay conform to 3.16.4.3.
4.6.5.5.2 Pressure switches. Post-test reference measurements without adjustments shall verify retention of the
pre-test setpoint and conformance to the requirements of 3.17.3.3.
4.6.5.5.3 Temperature switches. Post-test reference measurements without adjustments shall verify retention of
the pre-test setpoint and conformance to the requirements of 3.17.3.4.
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