MIL-DTL-83729C
4.6.12 Moisture resistance (see 3.16). Choppers shall be tested in accordance with method 106 of MIL-STD-
202. The following details and exceptions shall apply:
(a)
Mounting: On a corrosion-resistant metal panel, by normal mounting means.
(b)
Polarization: A polarizing voltage of 100 V dc shall be applied between all terminals tied together, and the
metal panel. The negative polarity shall be applied to the case. Steps 7a and 7b are not applicable.
(c)
Final measurements: Upon completion of step 6 of the final cycle, the IR shall be measured as specified in
4.6.5. After a 24-hour drying period at a relative humidity of 50 ± 5 percent, choppers shall be examined for
evidence of excessive peeling, flaking, chipping, or crazing of the protective coating, and dynamic contact
resistance, IR, DWV, dc coil resistance, coil impedance and waveform characteristics (with nominal drive
only) shall be measured as specified in 4.6.3.1.2, 4.6.5, 4.6.4, 4.6.3.2, 4.6.3.3, and 4.6.3.7, respectively.
4.6.13 Barometric pressure (reduced) (see 3.17). Choppers shall be tested in accordance with method 105 of
MIL-STD-202. The following details shall apply:
(a)
Mounting method: Choppers shall be rigidly mounted by a normal mounting means.
(b)
Test condition letter: C.
(c)
Tests during subjection to reduced pressure: The choppers shall be operated for 2 hours at the maximum
operating temperature. Within the final 15 minutes of the test, the waveform characteristics (with nominal
drive only) shall be measured as specified in 4.6.3.7.
4.6.14
Shock (see 3.18).
(a)
Mounting method: Choppers shall be rigidly mounted by normal mounting means.
(b)
(c)
Electrical load conditions: The coil shall be energized, and choppers contacts shall be monitored with an
oscilloscope to insure dwell time are continuous.
(d)
Test and measurements: After each direction of impact shock, measurements of waveform characteristics
(with nominal drive only) and starting voltage shall be made as specified in 4.6.3.7 and 4.6.3.6. At the
completion of the test, DWV shall be tested as specified in 4.6.4.1.
4.6.14.1 High impact shock (when specified, see 3.1 and 6.2.2). Choppers shall be tested in accordance with
method 207 of MIL-STD-202. The following details shall apply:
(a)
Mounting method: Same as 4.6.14.1a.
Electrical load conditions: Same as 4.6.14.1c except continuous dwell time not required.
(b)
(c)
Tests and measurements: Same as 4.6.14.1d.
4.6.15 Life (see 3.19). Unless otherwise specified (see 3.1 and 6.2.2), life tests shall be of 2,000 hours duration.
The coil shall be energized with nominal voltage and frequency. The temperature throughout the life tests shall be
+25 ± 5° C. No current or voltage shall be applied to the contacts during life tests.
(a)
At the start of life tests and 100, 500, 1,000, 1,500 and 2,000 hours, insulation resistance, dielectric
withstanding voltage, static and dynamic contact resistance, waveform characteristics and noise level shall
be measured as specified in 4.6.5, 4.6.4, 4.6.3.1.1, 4.6.3.1.2, 4.6.3.7, and 4.6.3.8, respectively. The coil
shall be energized with nominal voltage and frequency for all measurements. All measurements shall be
made at +25 ± 5° C before, during, and at the end of life tests.
5.
PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the contract or order
(see 6.2). When packaging of materiel is to be performed by DoD or in-house contractor personnel, these personnel
need to contact the responsible packaging activity to ascertain packaging requirements. Packaging requirements are
maintained by the Inventory Control Point's packaging activities within the Military Service or Defense Agency, or
within the military service's system commands. Packaging data retrieval is available from the managing Military
Department's or Defense Agency's automated packaging files, CD-ROM products, or by contacting the responsible
packaging activity.
6.
NOTES
(This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.)
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