scope:

This specification covers the general requirements for power type, low value (1 ohm and below), fixed resistors (2 terminal and 4 terminal) for use in electrical, electronic, communications, and associated equipment. Included are precision resistors of 1, 3, and 5 percent (characteristic T) and 5 and 10 percent (characteristic L) initial resistance tolerances with power ratings ranging from 2 to 10 watts at +25°C derated to 0 power at +275°C.

Resistors specified herein should be identified by a military part number which should consist of the basic number associated detail specification and a coded number. Each associated detail specification covers a different resistor type. The number should be coded to provide information concerning resistor characteristic, resistance value and tolerance. The military part number should be in the following form with a coded number derived as indicated:

The characteristic is identified by a single letter that signifies the level of stability through various electrical and environmental tests and operating characteristics. Characteristics L and T are available with the stability as noted (see table I).

The nominal resistance expressed in ohms is identified by five digits. The letter "R" should be substituted for one of the significant digits to represent the decimal point. The succeeding digits of the group represent significant figures. Minimum and maximum resistance values should be as Specified (see 3.1). The standard resistance values for each decade should follow the sequence demonstrated for the 0.01 to 0.1 decade in table II for all resistance tolerances. Only those resistance values which follow the sequence of values listed in the 0.01 to 0.1 decade in table IX should be considered as conforming to this specification. The resistance value designations are shown in table III.

The resistance tolerance, when applicable, should be identified by a single letter in accordance with table IV (see table I). Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: US Army Laboratory Command, ATTN: SLCET-R-S, Fort Monmouth, NJ 07703-5302, by using the self-addressed Standardization Document Improvement Proposal (DD Form 11426) appearing at the end of this document or by letter.