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MIL-PRF-26 Resistors, Fixed, Wire Wound \(Power Type\) General Specification ForThis specification covers the general requirements for power type, wirewound, fixed resistors for use in electrical, communications, and associated equipment. Included are general purpose styles of 5 percent initial resistance tolerance, with power ratings ranging from 3 watts to 240 watts at 25 Degrees C, derated to 0 power at 350 Degrees C \(characteristics N and V\) and precision axial lead types of .1\(B\) percent, .5 \(D\)percent, and 1 \(F\) percent initial resistance tolerances with power ratings ranging from 1 watt to 10 watts at 25 Degrees C, derated to 0 power at 250 degrees C \(characteristic U\).

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MIL-PRF-26H
APPENDIX A
TABLE A-I. Sample of qualification.
Will qualify styles in
Style
Characteristic N and V
Characteristic U
RW24
RW20 to RW24 inclusive
---
RW35
RW29 to RW35 inclusive
---
RW36
RW29 to RW36 inclusive
---
RW37
RW29 to RW37 inclusive
---
RW38
RW29 to RW38 inclusive
---
RW39
RW29 to RW39 inclusive and RW47
---
RW47
RW29 to RW38 inclusive and RW47
---
RW56
RW55 and RW56
---
RW68
RW67 to RW69 inclusive
---
RW78
---
RW78 and RW74
RW79
---
RW70 and RW79
RW80
---
RW80 and RW81
A.4. EXTENT OF QUALIFICATION
A.4.1 All characteristics. Approval of characteristics shall be in accordance with table A-II.
TABLE A-II. Extent of approval of characteristics.
Characteristic
Will qualify characteristic
V
V
U
U
N
V and N
A.4.1.1 Characteristic U. The resistance range included in the qualification of any one resistor style shall be
between any two adjacent resistance values which pass the qualification inspection. Also, qualification of the lower
resistance tolerances shall qualify the higher resistance tolerances in accordance with table A-III.
TABLE A-III. Extent of approval of resistance tolerances.
Resistance tolerance submitted
Will qualify resistance tolerances
B
B, D, F
D
D, F
F
F
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