MIL-PRF-49465C
f.
Measurement during test: Resistance shall be measured at the end of one half hour off periods, after, 250
hours +72 hours, -24 hours; 500 hours +72 hours, -24 hours; 1,000 hours +72 hours, -24 hours; 2, 000
hours +96 hours, -24 hours. Measurement shall be made as near as possible to the specified time but may
be adjusted so that measurement need not be made other than during normal weekdays.
g.
Examination after test: Resistors shall be examined for evidence of mechanical damage.
4.8.16 High temperature exposure (see 3.22).
a.
Mounting: Resistors shall be placed in a metal tray or basket.
b.
Initial measurements: DC resistance shall be measured as specified in 4.8.2.
c.
Procedure: Following initial resistance measurements, resistors shall be placed in a chamber maintained at
+275OC ±7OC for a period of 250 hours ±8 hours with no load applied.
d.
Measurements during test: 250 hours +48 hours, -0 hours.
e.
Final measurements: After removal from the test chamber, resistors shall be permitted to stabilize at room
temperature and within 6 hours after removal, cleaning of the leads will be allowed and the dc resistance
shall be measured as specified in 4.8.2. Resistors shall be examined for evidence of mechanical damage.
4.8.17 Fungus (see 3.23). Unless certification is provided, resistors shall be tested in accordance with method 508
of MIL-STD-810.
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 activity within the Military Service or Defense Agency, or within
the military services 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.)
6.1 Intended use. The resistors covered by this specification are military unique due to the fact that these devices
must be able to operate satisfactorily in military systems under the following demanding conditions: 20 G's of high
frequency vibration, 100 G's of shock (specified pulse), thermal shock (with no more than 1 percent deviation in initial
resistance), and a low temperature coefficient of resistance. In addition, these military requirements are verified
under a qualification system. Commercial components are not designed to withstand these military environmental
conditions.
6.2 Ordering data. Acquisition documents must specify the following:
a.
Title, number, and date of this specification, and the complete PIN (see 1.2).
b.
If not otherwise specified (see 2.1), the versions of the individual documents referenced will be those in
effect on the date of release of the solicitation.
c.
Packaging instructions (see 5.1).
d.
Bracket assembly requirements (see 6.6).
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