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MIL-R-12934/29 Revision C, March 20, 1972
Complete Document
Superseded By: MIL-PRF-12934/29
RESISTORS, VARIABLE, WIRE-WOUND, PRECISION, STYLE RR3800
Includes all amendments and changes through Validation Notice 1, October 25, 1991
Additional Comments: CNCL S/S BY MIL-PRF-12934/29
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This specification covers the detail requirements for style RR3800, variable, wire-wound, precision resistors.

The type designation shall be in the following form: CHART

Style RR3800 is applicable to this specification.

The function and shaft length applicable to this specification shall be identified by a single symbol in accordance with table I. TABLE I. Function and shaft length.
Symbol           Shaft length               Function     
             Tolerance ±1/32 (.79)                  
-------------------------------------------------------

A - - - -         ⅜ ( 9.53)                 Linear       
B - - - -         ½ (12.70)                 Linear       
C - - - -         ⅝ (15.88)                 Linear       
D - - - -         ¾ (19.05)                 Linear       
E - - - -         ⅞ (22.23)                 Linear       
F - - - -         1   (25.40)                 Linear       
                                                      




The class applicable to this specification shall be symbols 2 and 3.

The resistance temperature characteristics applicable to this specification are symbols A to H, inclusive.

The rotational life characteristics applicable to this specification are symbols 7, 8, and 9. This potentiometer is capable of operation up to 100 RPM.

The function conformity tolerance and resistance tolerance characteristics applicable to this specification are symbols G to L, inclusive and S to X, inclusive.

The nominal total resistance values applicable to this specification shall be in accordance with table II. TABLE II. Nominal total resistance and nominal resolution characteristics.
Nominal total          Nominal        
 resistance value     resolution     
---------------------------------------

     (Ohms )              (Percent)      

      100                    .075           
      200                    .061           
      500                    .048           
    1,000                    .038           
    2,000                    .035           
    5,000                    .028           
   10,000                    .031           
   20,000                    .024           
   50,000                    .018           
  100,000                    .014