scope:

This specification covers the detail requirements for style 2RV7 composition, variable, dual (2 ganged) resistors.

The type designation shall be in the following form:

The type designation shall be listed in the order in which the sections (cups) are stacked (ganged) beginning with the section (cup) nearest the mounting surface.

The style is identified by a two-letter symbol "RV" preceded and followed by a one-digit number. The first number identifies a dual ganged (2 cup) resistor, the letters identify composition, variable resistors, and the last number Identifies the size and power rating of both cups (see 3.6).

The type of bushing is identified by a single letter in accordance with MIL-R-94.

The temperature and moisture resistance characteristic is identified by a single letter in accordance with MIL-R-94.

The operating shaft styles and lengths are identified by a two-letter symbol. The first letter indicates operating shaft style in accordance with MIL-R-94, and the second letter indicates operating shaft length as specified in table I.

The nominal total resistance value expressed in ohms is identified by a three-digit number. The first two digits represent significant figures and the last specifies the number of zeroes to follow. The first three digits in the type designation is the value of resistor cup nearest the mounting surface and the next three digits is the resistance value of the second cup. Benificial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: US Electronics Research and Development Command, Attn: DELET-R-S, Fort Monmouth, NJ 07703-5302, by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. TABLE I. Length of operating shaft.

Symbol Length of shaft from mounting surface of resistors. Nominal 1/ Bushings Bushings N and S L and T ---------------------------------------------- inches inches ±.031 ±.031 (.79 mm) (.79 mm) A- - - - .625 (15.88 mm) B- - - - .500 (12.70 mm) D- - - - .875 (22.23 mm) .875 (22.23 mm) G- - - - 1.250 (31.75 mm) N- - - - 1.500 (38.10 mm) J- - - - 2.500 (50.80 mm) K- - - - 2.500 (63.50 mm) 1/ For resistors with panel seals, the mounting surface shall be considered the metal face of the panel seal when the seal is firmly seated against the resistor body.

The resistance characteristic combination is identified by a single letter which describes a combination of resistance characteristic symbols per MIL-R-94, as specified in table II. TABLE II. Resistance characteristic combination symbol.

Resistance characteristic Panel section rear section combination symbol Resistance characteristic symbol ----------------------------------------------------------- A A A C C C G A C H C A