MIL-R-10509J
b. Test temperature and tolerance: 70°C ±5°C for characteristics D and G, and 125°C ±5°C for characteristics C, E, and F.
c. Initial measurements: Measurements may be made inside or outside the chamber.
(1) Inside the chamber: When measurements are to be made inside the chamber, the initial dc resistance shall be measured after mounting at the applicable test temperature, after stabilization, and within 8 hours of exposure of the resistors to the test temperature. This initial measurement shall be used as the reference temperature for all subsequent measurements under the same condition.
(2) Outside the chamber: When measurements are to be made outside the chamber, initial dc resistance shall be measured after mounting at the room temperature. This initial measurement shall be used as the reference temperature for all subsequent measurements under the same condition.
d. Operating conditions: Rated dc continuous working voltage shall be applied intermittently, 1.5 hours "on" and 0.5 hour "off", for 1,000 hours, at the applicable test temperature.
e. Test condition letter: D.
f. Measurement during test: DC resistance shall be measured at the end of the 0.5 hour "off" periods after 250 hours +72 hours, -24 hours; 500 hours +72 hours, -24 hours; and 1,000 hours
+72 hours, -24 hours have elapsed.
g. Examination after test: Resistors shall be examined for evidence of mechanical damage.
4.7.14 Solderability (see 3.19). Resistors shall be tested in accordance with method 208 of
MIL-STD-202. The following detail apply: Both terminal leads of each resistor shall be immersed to within .062 inch (1.57 mm) of the resistor body.
4.7.15 Shock, specified pulse (see 3.20). Resistors shall be tested in accordance with method 213 of
MIL-STD-202. The following details and exceptions shall apply:
a. Special mounting means: Resistors shall be rigidly mounted on appropriate jig fixtures with their bodies restrained from movement and their leads supported at a distance of .25 inch (6.35 mm) from the resistor body. These fixtures shall be constructed in a manner to insure that the points of the resistor mounting supports will have the same motion as the shock table. Test leads used during this test shall be no larger than AWG size 22 stranded wire, so that the influence of the test lead on the resistor will be held to a minimum. The test lead length shall be no greater than necessary. In all cases, the 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.
b. Measurement before shock: DC resistance shall be measured as specified in 4.7.2. c. Test condition: I.
d. Number and direction of applied shocks: The resistors shall be subjected to a total of ten shocks
in each of two mutually perpendicular planes, one perpendicular and the parallel to the longitudinal axis of the resistor.
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