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MIL-PRF-39005 Resistors, Fixed, Wirewound \(Accurate\), Nonestablished Reliability, Established Reliability, General Specification ForThis specification covers the general requirements for nonestablished reliability \(non-ER\), established reliability \(ER\), accurate, wire-wound, fixed resistors that have a maximum resistance tolerance of 1 percent and a high degree of stability with respect to time under specified environmental conditions. The resistors are capable for continuous full-load \(or voltage\) operation at any ambient temperature up to 125??C, and when derated, up to 145??C \(see 6.5\). They are not capable for application where the alternating current \(ac\) characteristics are of critical importance. ER resistors have life failure rates \(FR\) ranging from 1.0 percent to 0.001 percent per 1,000 hours \(see 1.2.1.5\). These FR are established at 60-percent confidence level on the basis of the life tests. The FR, identified by the appropriate symbol, is referred to operation at full rated voltage and temperature.

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MIL-PRF-39005G
APPENDIX A
TABLE A-I. Number of sample units and resistance value.
Group number
Number of
Resistance value
sample units 1/
II
30
Highest
III
30
Highest
IV
30
Highest
10
Highest
V
30
10
10,000 ohms or value nearest 10,000 ohms
10
10 ohms 2/
34
Highest
VI
102
34
10,000 ohms (wound with same type of wire as highest resistance value)
34
10 ohms 2/
VII
19
Any value
34
Highest
102
34
10,000 ohms (wound with same type of wire as highest resistance value)
VIII
34
10 ohms 2/
Uncoated or
unenclosed
IA (visual and
2
Highest
mechanical)
1/ If the same coatings and materials are not used for all resistance values and tolerances with the
same style an additional submission shall be made for each coating and material. The term
"material" in this specification does not apply to the resistance wire element.
2/ Ten ohms or a higher value. The higher value is the minimum value for which approval is sought.
TABLE A-II. Extent of qualification by tolerance.
Symbol
Initial resistance
Will qualify
tolerance
resistance tolerance
T
0.01 percent
Q, A, B, F
Q
0.02 percent
A, B, F
A
0.05 percent
B, F
B
0.1 percent
F
F
1.0 percent
36



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