MIL-PRF-29C
4.7.9.1 Daily cycle.
Step 1: Resistors shall be placed in a dry oven maintained at a temperature of 85 C ±2 C. A dc supply of
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a.
the rated voltage specified (see 3.1) shall be applied to the resistors for a period of 1 hour. Immediately
after removal of this potential, the dc resistance shall be measured while the resistors are in the oven.
b.
Step 2: Within 5 seconds after removal from the oven, resistors shall be immersed for a period of 1 hour in
a saturated solution of sodium chloride maintained at a temperature of 85 C ±2 C. Within 5 seconds after
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removal of the bath, resistors shall be immersed for a period of 1 hour in another saturated solution of
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sodium chloride maintained at a temperature of 0 C +4 C, -0 C. Resistors shall then be thoroughly and
quickly washed in tap water and all surfaces wiped or air blasted clean and dry.
Step 3: Resistors shall be placed in a dry oven maintained at a temperature of 85 C ±2 C. A dc supply of
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c.
the rated voltage specified (see 3.1) shall be applied to the resistors for a period of 1 hour. Resistors shall
then be subjected again to step 2 and step 1, in that order.
4.7.10 Vibration. Resistors shall be tested in accordance with method 201 of MIL-STD-202. (see 3.17) The
following details and exception shall apply:
a.
Measurements prior to vibration: DC resistance measurement shall be as specified in 4.7.4.
b.
Method of mounting: Resistors shall be mounted by securely clamping the ferrules to the vibration platform.
c.
Tests and measurements after vibration: DC resistance measurements as specified in 4.7.4, dielectric
withstanding voltage test as specified in 4.7.2, and insulation resistance test as specified in 4.7.3. Resistors
shall then be examined for evidence of mechanical damage.
4.7.11 Security of ferrules. One ferrule of the resistor shall be clamped in a fixed position and a torque of
5 inch-pounds applied to the other ferrule. The torque shall be applied in both clockwise and counterclockwise
directions. (see 3.18)
4.7.12 Mechanical strength. Resistors shall be supported .125 inch (3.17 mm) from the outer end of each ferrule
and shall be subjected to a transverse load of 25 pounds applied at the center of the unit through a fulcrum having a
radius of not less than 0.25 inch (0.64 mm). (see 3.19)
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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