MIL-DTL-13718F
4.5.17 Shock test. To determine conformance to 3.4.13.3, relay shall be subjected to the
functional shock test as specified in MIL-STD-810, method 5.16.4, procedure I. Saw tooth
shock pulses shall be 40 gravitational units (g) with a duration of 11 milliseconds (ms). One of
the principal axes of shock pulses shall be along the line of contact movement. During each pulse,
relay shall be energized with pickup voltage specified in the applicable drawings (see 3.3), and
shall remain energized throughout test. Duration of contact bounce shall be observed and
recorded. Care shall be taken to insulate recording device from shock. After test, specimen shall
be examined for loose or broken parts. Thereafter, specimen shall be tested as specified in 4.5.12.
4.5.18 Corrosion resistance test. To determine conformance to 3.4.13.4, relay shall be
subjected to salt fog test specified in ASTM B117, except that duration of test shall be 200 hours.
Immediately upon completion of test, relay shall be rinsed in lukewarm water, temperature
stabilized, and tested as specified in 4.5.6, 4.5.7, and for 500 cycles as specified in 4.5.10.
4.5.19 Fungus resistance test. To determine conformance to 3.4.13.5, relay shall be
subjected to fungus test in accordance with ASTM G21, except that test duration shall be
90 days. Upon completion of test, relay shall be temperature stabilized and tested as specified in
4.5.6, 4.5.7, and for 500 cycles as specified in 4.5.10.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as
specified in the contract or order (see 6.2). When actual packaging of materiel is to be performed
by DoD personnel, these personnel need to contact the responsible packaging activity to ascertain
requisite packaging requirements. Packaging requirements are maintained by the Inventory
Control Point's packaging activity within the Military Department or Defense Agency, or within
the Military Department's System Command. 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 which may be
helpful, but is not mandatory.)
6.1 Intended use. Relays covered by this specification are intended for use as master
relays, starter circuit relays, or control relays in tactical military vehicles. Since the relays must
operate in extreme battlefield conditions under which commercial items would experience
catastrophic failure (temperatures between 70 and +170°F (-56.7 and +76.7°C), shock and
vibration commensurate with tactical military use (see 3.4.13.1 and 3.4.13.3), these items are
military unique.
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