MIL-PRF-39015E
d. Polarization and loading voltage: The resistors shall be divided in two equal groups; one group
shall be subjected to polarization and the other group to load.
(1) Polarization: During steps 1 to 6 inclusive, a 100 volt dc potential shall be applied with the
positive lead connected to the resistor terminals tied together, and the negative lead
connected to the mounting plate.
(2) Loading voltage: During the first two hours of steps 1 and 4, a dc potential equivalent to 100
percent rated wattage, but not exceeding the maximum rated voltage (see 3.1), shall be
applied to the resistors.
e. Test procedure: The moisture resistance cycling requirements shall be as follows: For
qualification inspection 20 cycles; for group B inspection 10 cycles.
f. Final measurements: Upon completion of steps 6 of the final cycle, the resistors shall be removed
from the chamber and air dried for one half hour at room ambient conditions. Samples shall not
be subjected to forced air drying. The total resistance and insulation resistance shall then be
measured (30 minutes to 60 minutes after removal from the humidity chambers), as specified in
do not apply.
g. Examination after test: Resistors shall be examined for evidence of mechanical damage.
of MIL-STD-202. The following details and exceptions shall apply:
a. Mounting means: Resistors shall be mounted by their normal mounting means, with their bodies
restrained from movement on an appropriate mounting fixture. The mounting fixture shall be
constructed in such a manner as to insure that the mounting supports remain in a static condition
with reference to the shock test table. 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. Test leads: Test leads used during this test shall be no longer than average wire gauge (AWG)
size 22 stranded wire, so that the influence of the test lead on the resistor shall be held to a
minimum. The test lead length shall be no longer than necessary.
c. Measurements before shock: Total resistance and setting stability shall be measured as specified
d. Test condition: I.
e. Measurement during shock: Each resistor shall be monitored to determine electrical discontinuity
of the resistance element, and between the contact arm and element, by a method that shall at
least be sensitive enough to monitor or register, automatically, any electrical discontinuity of 0.1
millisecond or greater duration.
f. Measurement after shock: Setting stability and total resistance shall be measured as specified in
g. Examination after shock: Resistors shall be examined for evidence of mechanical damage.
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