MIL-PRF-22E
4.7.9 Salt spray (corrosion). Resistors shall be tested in accordance with method 101 of MIL-STD-202 (see 3.12).
The following details and exceptions shall apply:
a. Mounting details: On aluminum panels by their normal mounting means.
b. Test condition: B.
c. Examination and test after exposure: Enclosures, if any, shall be removed and resistors washed, shaken,
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and air blasted and permitted to dry 24 hours at 40 C. The resistors shall then be examined for marked
corrosion, and tested for electrical continuity and mechanical operation.
4.7.10 Humidity (steady state). Resistors shall be tested in accordance with method 103 of MIL-STD-202
(see 3.13). The following details shall apply:
a. Mounting: On an aluminum panel.
b. Measurement after conditioning: Total resistance (see 4.7.3 to 4.7.3.1.2, as applicable) shall be measured.
c. Test condition: B.
d. Length of time and points of application of polarizing voltage: A 120 volt dc potential shall be applied for 96
hours between the mounting panel and resistor winding through the contact arm set at extreme
counterclockwise end of the total resistance. The positive terminal of the voltage source shall be applied to
the resistor winding.
e. Measurement during test: Total resistance (see 4.7.3 to 4.7.3.1.2, as applicable) shall be measured at the
end of the 96 hour period.
f. Measurement after the test: Total resistance (see 4.7.3 to 4.7.3.1.2, as applicable) shall be measured after
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the resistors have been removed from the humidity chamber and placed in a dry atmosphere at 40 C 5 C
for one hour and fifteen minutes.
4.7.11 Rotational load life. Resistors shall be tested in accordance with method 206 of MIL-STD-202 (see 3.14).
The following details and exceptions shall apply:
a. Mounting: Resistors shall be connected, such that a substantially constant current of nominal rating
(see 3.1) flows through the resistors irrespective of the contact arm position during oscillation of the contact
arm. Resistors shall be mounted with the shafts extending in a horizontal plane and with the terminals
pointing downward. Locking bushing type resistors shall have their locking nuts removed.
b. Test potential: A dc potential equivalent to that required to dissipate rated wattage and limited in current to
rated wattage shall be applied across the resistive element. If desired, an ac potential may be applied to
resistors not having an electrical off position.
c. Cycle rate in cycles per minute (cpm): 5 - 20 cpm through 90 percent of total mechanical rotation. For
resistors having an electrical off position, the moving contact shall pass through the electrical off position.
d. Test condition:
(1) A, for locking bushing type resistors.
(2) C, for standard bushing type and two hole mounting resistors.
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