MIL-DTL-19648E
then be subjected to 25°C ±5°C ambient temperature and the heater energized with nominal voltage for
an additional 200 hours. At the end of the second 200-hour period, the relay shall be allowed to stabilize
at 25°C and normal operate time shall be tested as specified in 4.7.3.2.
4.7.16.4 Load impedance. A load impedance shall be connected to each NO and NC contact, and the
power supply shall be connected to each movable, or "common" contact. If the life test load is resistive,
suitable resistors shall be used as load resistance. If the life test load is specified as tungsten lamp,
resistance components shall be composed entirely of tungsten lamps, which shall be operated at their
rated voltage. Specified current shall flow when the lamps have stabilized. If the life test is specified as
inductive, an appropriate inductive load component shall be used. A suitable resistor load may be placed
in series with the inductive load component to obtain rated steady state current flow. If the contact rating
includes two or more loads, a minimum of two sample units shall be loaded with each load. For all dc
inductive loads from 2 amperes to 100 amperes, approval of the inductors by the qualifying activity is
required (see 6.9).
4.7.16.5 Power supply characteristics. If the rated contact load is dc, the ripple (cause by commutator,
rectifier or battery charger) shall not exceed 5 percent under maximum load measured at the load
terminals; the no-load and full-load voltage shall not differ more than 5 percent measured at the relay
contacts connected to the source; and the source impedance shall be essentially noninductive. For ac
contact loads, the source impedance shall not exceed 2 percent of the load impedance.
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 that may be helpful, but is not
mandatory.)
6.1 Intended use. Relays conforming to this specification are intended for use in electronic and
communication equipment. Their principal areas of application are for ground-support electronic and
communication equipment. Relays covered by this specification operate satisfactorily in systems under
the following demanding conditions: operating temperature range of -65°C to +125°C, 20 g's to 100 g's of
vibration, 50 g's to 1500 g's of shock, and have reduced susceptibility to corrosion in salt water
environments. This does not preclude the use of these relays in other military applications.
6.2 Acquisition requirements. Acquisition documents must specify the following:
a. Title, number, and date of the specification.
b. Issue of DoDISS to be cited in the solicitation, and if required, the specific issue of individual
documents referenced (see 2.2).
c. Packaging requirements (see 5.1).
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