MIL-PRF-94G
4.7.16 Vibration, high frequency. Resistors shall be tested in accordance with method 204 of MIL-STD-202. The
following details and exceptions shall apply (see 3.19):
a.
Mounting: Resistors shall be mounted by their normal mounting means to an appropriate nonresonant
mounting fixture. A suggested mounting fixture is shown in figure 6. The mounting fixture shall be
constructed in a manner as to insure that the points of the resistor mounting supports shall have the same
motion as the vibration test table. Test leads used during this test shall be as small as a wire size as
practicable (e.g., AWG 22 stranded) so the influence of the test lead on the resistor will be held to a
minimum. The test lead length shall be no longer than necessary. A shielded cable which may be
necessary because of the field surrounding the vibration test table, shall be clamped to the mounting fixture.
In all cases, resistors shall be mounted in relation to the test equipment in such a manner that the stress
applied is in the direction which would be considered most detrimental. The contact arm shall be positioned
at 50 percent of mechanical rotation. The locking bushing styles shall be in the locked position.
b.
Measurements after mounting: Resistors shall be measured as specified in 4.7.2. The resistance shall be
measured between the contact arm terminal and terminal 1 and between terminals 1 and 3.
c.
Test condition: C, part 2.
d.
Motion: In each of two mutually perpendicular directions, one perpendicular and the other parallel to the
longitudinal axis of the resistor.
e.
Measurements during test: Each resistor shall be monitored to determine momentary discontinuity of the
element, and between the contact arm and element, by a method which shall at least be sensitive enough to
monitor or register automatically any momentary discontinuity having a duration of 0.1 millisecond (ms) or
less, as well as those of greater duration. A measurement of transient resistance change between the
contact arm terminal and terminal 1 shall also be made.
Examinations after shock: Resistors shall be measured as specified in 4.7.2. The resistance shall be
f.
measured between the contact arm terminal and terminal 1, and between terminals 1 and 3. Resistors shall
be examined for evidence of mechanical and electrical damage.
4.7.17 Fungus. Resistors shall be tested in accordance with method 508 of MIL-STD-810. Resistors shall be
examined for evidence of mechanical damage (see 3.20).
4.7.18 Immersion (MIL-PRF-94/7 (RV8) only). Resistors shall be immersed for 1 minute ±5 seconds in water at
4.7.19 Resistance to solvents (MIL-PRF-94/7 (RV8) only). Resistors shall be tested in accordance with method 215
of MIL-STD-202 (see 3.22).
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.
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