MIL-PRF-26H
4.7.16 Life (see 3.20). Resistors shall be tested in accordance with method 108 of MIL-STD-202. The following
details and exceptions shall apply:
a.
Method of mounting: Resistors shall be mounted by their normal mounting means except that axial-terminal
resistors shall be mounted on light-weight terminals with an effective minimum lead length of 5/16 inch (7.94
mm). Resistors shall be so arranged that the temperature of any one resistor shall not appreciably influence
the temperature of any other resistor.
Initial measurement: DC resistance shall be measured as specified in 4.7.2.
b.
O
O
O
Test temperature: This test shall be conducted at an ambient temperature of 25 C +10 C, -5 C.
c.
d.
Operating conditions: Rated dc continuous working or ac rms equivalent voltage shall be applied
intermittently, 1.5 hours "on" and .5 hours "off." Each resistor shall dissipate rated wattage. Adequate
precautions shall be taken to maintain constant voltage on the resistor.
e.
Test condition: 2,000 hours.
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, and compared to the similar reading taken in 4.7.16b. Measurement shall be
made as near as possible to the specified time but may be adjusted so that measurement need not be made
during other than normal working days.
g.
Inspection after test: Resistors shall be inspected for evidence of mechanical damage.
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 film resistors described herein are intended to be used in electronic circuits where
semiprecision characteristics and small sizes are required. These resistors are unique due to the fact that they must
be able to operate satisfactorily in military systems under the demanding conditions such as 20 Gs of high frequency
vibration, moisture resistance test, salt corrosion test, and 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:
Title, number, and date of this specification, and the complete PIN (see 1.2).
a.
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).
Whether bracket assembly is required (see 6.5).
d.
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