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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
1.2.1.1.1 Performance requirements. The performance requirements are identified in accordance with
1.2.1.2 Resistance value designator. The resistance value designator is a coded value which identifies
the resistance value, maximum resolution, and maximum rated working voltage (see 3.1).
1.2.1.3 Terminals. The terminals are identified by a single letter in accordance with table II.
1.2.1.4 Product level designator. The product level designation as shown in table III is signified by a
single letter (M, P, R, S, or C), which identifies the product level for which the resistor is qualified.
TABLE I. Performance requirements.
*
Style
(Termination "L"
(Inactive for
is inactive for
new design)
new design)
Maximum resistance temperature characteristic in ppm/°C
±50 ppm/°C
±50 ppm/°C
±50 ppm/°C
(Ref. to 25°C) (see 3.19)
10
10
10
Minimum resistance ­ ohms
20,000
20,000
20,000
Maximum resistance - ohms
Maximum ambient temperature at rated wattage (see figure 2)
85°C
85°C
85°C
Maximum ambient temperature at zero wattage (see figure 2)
150°C
150°C
150°C
Power rating in watts (see 3.1)
3/4
3/4
3/4
Resistance tolerance (in percent)
1, 2
1, 2
1, 2
Minimum resistance (ohms)
2.7
1
1
Maximum resistance (ohms)
1M
10 M
3.01 M
Maximum percent change in Resistance ±: 1/
0.5
0.5
0.5
Conditioning (3.8)
1
1
1
Thermal shock (3.17)
1
1
1
Moisture resistance (3.20)
1
1
1
Shock (specified pulse) (3.21)
1
1
1
Vibration, high frequency (3.22)
1
1
1
Resistance to soldering heat (3.24)
1
1
1
Low temperature operation (3.25)
1
1
1
Low temperature storage (3.26)
1
1
1
High temperature exposure (3.27)
1
1
1
Rotational life (3.29)
(see 3.31)
(see 3.31)
(see 3.31)
Life (3.31)
Resistance tolerance (percent)
5
5
5
1,000 MΩ Min
1,000 MΩ Min
1,000 MΩ Min
Insulation resistance - dry (3.15)
100 MΩ Min
100 MΩ Min
100 MΩ Min
Insulation resistance - wet (3.20)
1/ Where total resistance change is 1.0 percent or less, it is considered as ±(
percent +0.05 ohm).
2



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