MIL-PRF-49462C
4.8.3.2 Procedure. The load shall be 1.5 times rated power for a duration of 100 hours ±8 hours, not to
exceed the maximum voltage specified (see 3.1). The voltage applied may be rectified ac or dc. DC
resistance shall be measured before and after the test following a 2 hour stabilization period at +25°C
±2°C. Resistors shall be examined for evidence of arcing, burning, or charring.
4.8.4 Solderability (see 3.9). Resistors shall be tested in accordance with method 208 of
MIL-STD-202. Both leads shall be tested.
4.8.5 Resistance to solvents (see 3.10).
4.8.5.1 Procedure. Resistors shall be tested in accordance with method 215 of MIL-STD-202. The
following details shall apply:
a. The marked portion of the resistor body shall be brushed.
b. The number of sample units shall be as specified in A.3.1.
4.8.6 Thermal shock (see 3.11). Resistors shall be tested in accordance with method 107 of
MIL-STD-202. The following details and exceptions shall apply:
a. Mounting: Resistors shall be mounted by means other than soldering.
b. Measuring before cycling: DC resistance shall be measured as specified in 4.8.2.
c. Test condition letter: B, except that the extreme high temperature shall be +150°C +3°C, -0°C.
d. Measurement after cycling: Within 3 hours after completion of the final cycle and as soon as the
resistors stabilize at room temperature, dc resistance shall again be measured as specified in 4.8.2.
e. Examination after test: Resistors shall be examined for evidence of mechanical damage.
4.8.7 Low temperature operation (see 3.12).
4.8.7.1 Mounting. Resistors shall be mounted in such a manner that there is at least 1 inch of free air
space around each resistor, and in such a position with respect to the air stream that the mounting offers
substantially no obstruction to the flow of air across and around the resistors.
4.8.7.2 Procedure. DC resistance shall be measured as specified in 4.8.2. Within 1 hour after this
measurement, the resistors shall be placed in a cold chamber at a temperature of -65°C ±2°C for a period
of 24 hours ±4 hours. The resistors shall then be removed from the chamber and maintained at a
temperature of +25°C ±5°C for a period of approximately 2 hours to 8 hours; the dc resistance shall again
be measured as specified in 4.8.2. Resistors shall then be examined for evidence of mechanical
damage.
4.8.8 Terminal strength (see 3.13). DC resistance shall be measured as specified in 4.8.2. Each
resistor lead will have a 16 ounces ±1 ounce weight clamped to each lead in turn. Each lead shall be
subjected to four 90° arcs (an arc is defined as the movement of the lead away from the original position
through 90° from the original position and back to the original position). The dc resistance shall then be
again measured as specified in 4.8.2. Resistors shall then be examined for evidence of breaking,
loosening of terminals and chipping of glass.
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