scope:

This specification covers the general requirements for high-stability, film, fixed resistors of ±0.10-, ±0.25-, ±0.50-, and ±1.00-percent resistance tolerances, which are relatively stable with respect to time, temperature, and humidity.

The type designation shall be in the following form (see 6.1):

The style is identified by the two-letter Symbol "RN" followed by a two-digit number; the letters identify high-stability, film, fixed resistors, and the number identifies the size of the resistors.

The characteristic is identified by a single letter in accordance with table I.

The nominal resistance expressed in ohms is identified by four digits; the first three digits represent significant figures and the last digit specifies the number of zeros to follow. When the value of resistance is less than 100 ohms, or when fractional values of an ohm are required, the letter "R" shall be substituted for one of the significant digits to represent the decimal point. When the letter "R" is used, succeeding digits of the group represent significant figures. The resistance-value designations are shown in table II. Minimum and maximum resistance values shall be as specified (See 3.1). The standard values for every decade shall follow the sequence demonstrated for the "10 to 100" decade in table III. Although resistance tolerances B and C (see 1.2.1.4) normally require more than three significant figures to adequately describe the true resistance value, for the purpose of this specification, the nominal value shall be three significant figures followed by the fourth digit to signify the number of zeros to follow. The resistance values for 0.10-percent resistance tolerance (B) may be of any value, but it is preferred that the values be chosen from the 192-value series decade specified for resistance tolerances C and D. TABLE II. Designation of resistance values.

Designation Resistance ---------------------------------------------------------------------------------------- Ohms 10R0 to 97R6 incl - - - - - - 10.0 to 97.6 incl 1000 to 9760 incl - - - - - - 100 to 976 incl 1001 to 9761 incl - - - - - - 1,000 to 9,760 incl 1002 to 9762 incl - - - - - - 10,000 to 97,600 incl 1003 to 9763 incl - - - - - - 100,000 to 976,000 incl 1004 to 9764 incl - - - - - - 1,000,000 to 9,760,000 incl 1005 - - - - - - - - - - - - 10,000,000

The resistance tolerance is identified by a single letter in accordance with table IV. TABLE IV. Resistance tolerance.

Symbol Resistance tolerance ------------------------------------------------------- Percent (±) B^1/ - - - - - - - - - - 0.10 C^1/ - - - - - - - - - - 0.25 D^1/ - - - - - - - - - - 0.50 F - - - - - - - - - - - 1.00 ^1/ Applicable only to characteristics C, E, and F.