MIL-PRF-22684F
c. Polarization and loading voltage:
(1) Polarization voltage: During steps 1 to 6 inclusive, a 100-volt dc potential shall be applied only to
resistors which have a polarizing strap. This potential shall be applied with the positive lead connected to
the resistor terminals tied together and the negative lead connected to the polarizing straps.
(2) Loading voltage: During the first 2 hours of steps 1 and 4, a dc test potential equivalent to 100-percent
rated dc continuous working voltage shall be applied to those resistors which do not have the polarizing
strap specified in 4.6.10a.
d. Subcycle: Step 7a shall be performed during any five of the first nine cycles. Step 7b shall not be applicable.
All polarizing straps shall be removed to perform step 7a and then be replaced prior to returning the resistors
to the humidity chamber.
e. Final measurements: Upon completion of step 6 of the final cycle, the resistors shall be held at the high-
humidity condition and a temperature of 25°C ±2°C for a period of 1 hour 30 minutes to 3 hours 30 minutes.
Resistors shall be removed from the chamber and within 30 minutes, without any additional handling, the dc
resistance, dielectric withstanding voltage, and insulation resistance shall be measured in that order, as
specified in 4.6.2, 4.6.7.1, and 4.6.8, respectively. The straps specified in 4.6.7 and figure 2, shall be used for
these measurements. Sample units shall not be subjected to forced air drying prior to or during these final
measurements.
f. Examination after test: Resistors shall be examined for evidence of mechanical damage.
4.6.11 Resistance-temperature characteristic (see 3.16). Resistors shall be tested in accordance with
method 304 of MIL-STD-202. The following details and exceptions shall apply:
Test temperature: In accordance with table VI.
TABLE VI. Ambient temperature for resistance-temperature characteristic test.
Temperature °C
Sequence
Qualification
Group B
inspections 1/
Inspection
25 ±3 2/
25 ±3 2/
1
-15 ±3
-55 ±3
2
-55 ±3
25 ±3
3
25 ±3
150 ±3
2/
4
65 ±3
---
5
150 ±3
---
6
1/ At the option of the manufacturer, the reverse sequence may be as follows:
1. - 25 ±3
2/
2. - 150 ±3
3. - 25 ±3
2/
4. - -55 ±3
2/ This temperature shall be considered the reference temperature for each
of the succeeding temperatures.
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