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MIL-PRF-39015 Resistors, Variable, Wirewound, \(Lead Screw Actuated\), Nonestablished Reliability, And Established Reliability, General Specification ForThis specification covers the general requirements for nonestablished reliability \(non-ER\) and established reliability \(ER\), lead screw actuated; wirewound variable resistors with a contact bearing uniformly over the surface of the entire resistive element, wound linearly, when positioned by a multiturn lead screw actuator. These resistors are capable of full load operation \(when the maximum resistance is engaged\), at a maximum temperature of 85OC and are capable for continuous operation, when properly derated, at maximum temperature of 150OC \(see 3.6\), with a resistance tolerance of ??5 percent. The ER resistors have life failure rate \(FR\) levels ranging from 1.0 percent to 0.001 percent per 1,000 hours \(see 1.2.1.4\). These FR levels are established at a 60 percent confidence level on the basis of life tests.

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MIL-PRF-39015E
3.6 Power rating. The resistors shall have a power rating based on continuous full-load operation at
the ambient temperature specified (see 3.1 and figure 2). For temperatures in excess of those specified
value, the load shall be derated as shown on figure 2. Power ratings as specified (see 3.1) are applicable
only when the maximum resistance is engaged in the circuit.
FIGURE 2. Derating curve for high ambient temperatures.
3.7 Voltage rating. Each resistor element shall have a rated direct current (dc) continuous working
voltage or an approximate sine-wave root-mean-square (rms) continuous working voltage corresponding
to the wattage (power) rating, as determined from the following formula:
E = (PR)
Where:
E = Rated dc or rms ac continuous working voltage at commercial-line frequency and waveform.
P = Power rating (see 3.1).
R = Nominal resistance (see 3.1).
In no case shall the rated dc or rms ac continuous working voltage be greater than the applicable
maximum value (see 3.1).
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