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MIL-PRF-22097 Resistors, Variable, Nonwirewound, Adjustment Type, General Specification ForThis specification covers the general requirements for multi-turn lead screw actuated and single turn nonwirewound, variable resistors with a contact bearing uniformly over the entire surface of the entire resistive element, when positioned by the actuator. These resistors are capable of full load operation \(where maximum resistance is engaged\) at a maximum ambient temperature of 70 Degrees C and 85 Degrees C, and are capable for continuous operation when properly derated, at a maximum temperature of 125 Degrees C and 150 Degrees C \(see figure 1\). These resistors have a resistance of ┬▒10 percent \(see 3.1\).

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MIL-PRF-22097J
TABLE V. Qualification inspection 1/
Requirement
Method
Number of failures
Inspection
paragraph
Paragraph
allowed 2/
Visual and mechanical inspection 3/ 4/
to 3.4.7 incl., 3.28
to 3.32 incl.
Group I 4/
Total resistance 1/
0
Actual effective electrical travel
End resistance
Contact resistance variation
Dielectric withstanding voltage
Insulation resistance
Torque
Thermal shock
Group II
Resistance temperature characteristic 4/
Moisture resistance
Contact resistance variation
Group III
Shock (specific pulse)
Vibration, high frequency
Contact resistance variation
Salt spray (corrosion)
Group IV
Resistance to soldering heat
1
(terminal types P, S, W, X, and Y)
Life
Contact resistance variation
Group V
Low temperature operation
High temperature exposure
Contact resistance variation
Group VI
Rotational life
Contact resistance variation
Terminal strength
Group VII
0
Solderability (terminal types P, W, X, Y)
Immersion (terminal types P, W, X, Y)
Group VIII
0
Fungus
2/ Failure of s single resistor in one or more tests of a group shall be charged as a single failure.
3/ Marking shall be considered defective only if marking is illegible. Marking shall remain legible at the end of all
tests. Marking shall remain legible at the end of all tests. Marking is not applicable to unenclosed resistors.
4/ Nondestructive tests.
12



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