MIL-R-93 Resistors, Fixed, Wire-Wound, Accurate, General Specification ForThis specification covers the general requirements for accurate, wire-wound, fixed resistors having a maximum resistance tolerance of 1 percent, with the winding protected against high humidity. The resistors are rated for continuous full load operation at any ambient temperature up to 125 Degrees C, and derated up to 145 Degrees C. They are not capable for application where alternating current ac characteristics are of critical importance. Performance characteristics are in accordance with table I.

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MIL-R-93F

APPENDIX A

TABLE A-I. Sample units and resistance value for multiple type submission. (For single lead type) 11

Group number of

table VII

Number of

sample units

21 31

Resistance value

Coated or enclosed

IA II III

Uncoated or unclosed

Any value Highest Highest

10,000 ohms or value nearest 10,000 ohms

Highest

10,000 ohms (wound with same type wire as highest resistance value)

10 ohms 41

10,000 ohms or value nearest 10,000 ohms

Highest

11 Qualification of both leads "C" and "W" is possible by a partial submission of additional samples under A.3.1.2.

21 One additional coated or enclosed sample unit of each resistance value shall be submitted to permit substitution for the defective allowed in group I of table VII.

31 If the same coatings and materials are not used for all resistance values and tolerances within 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.

41 10 ohms or a higher value, if this higher value is the minimum value for which approval is sought.

A.4.2 Multiple type submission. The resistance range included in the qualification of any one resistor style and terminal shall be between the highest resistance value tested and the lowest resistance value for which qualification is sought, provided the same materials are used within the range qualified. Qualification of resistors by initial resistance tolerance shall qualify resistors of the same style and resistance range in any of the other initial resistance tolerances as listed in table A-II provided the same coating, enclosure, and materials are used.

TABLE A-II. Extent of qualification by tolerance.

Symbol

Initial resistance

tolerance

Will qualify

resistance tolerance

A B

D F

0.05 percent

0.1 percent

0.5 percent

1.0 percent

A, B, D, F B, D, F

D, F F