scope:

This specification covers the general requirements for power type, wire-wound, fixed resistors which utilize the principal of heat dissipation through a metal mounting surface. The resistors have an initial resistance tolerance of ±1 percent and a resistance-temperature characteristic range from 30 ppm per °C to 200 ppm per °C depending upon the resistance value. They are not suitable for application when the alternating current (ac) characteristics are of critical importance; however, provisions have been made to minimize the inductance.

The PIN shall be in the following form, and as specified (see 3.1 and 6.3).

The style is identified by the two-letter symbol "RE" followed by a two digit number; the letters identify chassis-mounted, power type, wire-wound, fixed resistor, and the number identifies the size and power rating of the resistor.

The characteristic is identified by a single letter which identifies the maximum continuous operating temperature, and inductive (G) or noninductive (N) method of winding in accordance with table I. TABLE I. Characteristic.

Symbol Method of Maximum continuous winding operating temperature ---------------------------------------------------- G Inductive +250°C N Noninductive +250°C

Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Commander, Defense Electronics Supply Center, ATTN: DESC-ES, 1507 Wilmington Pike, Dayton, OH 45444-5274, by using the Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter.

The nominal resistance value expressed in ohms is identified by a four digit number; the first three represent significant figures, and the last digit specifies the number of zeros to follow. Where fractional values of an ohm, and values of less than 100 ohms are required, the letter "R" is substituted for one of the significant digits to represent the decimal point. When the letter "R" is used, the succeeding digits become significant. The following are examples of symbols for resistance values:

0R05 = 0.05 ohm 0R10 = 0.10 ohm 1R00 = 1.00 ohm 10R0 = 10.0 ohms 1000 = 100 ohms 1001 = 1,000 ohms 1002 = 10,000 ohms

Minimum and maximum nominal resistance values shall be as specified (see 3.1). The standard resistance values for every decade shall follow the sequence demonstrated for the "1 to 10" decade (see table II). TABLE II. Standard resistance values for the 1 to 10 decade. 1/

1.00 1.50 2.26 3.40 5.00 7.15 1.02 1.54 2.32 3.48 5.11 7.32 1.05 1.58 2.37 3.57 5.23 7.50 1.07 1.62 2.43 3.65 5.36 7.68 1.10 1.65 2.49 3.74 5.49 7.87 1.13 1.69 2.55 3.83 5.62 8.00 1.15 1.74 2.61 3.92 5.76 8.06 1.18 1.78 2.67 4.02 5.90 8.25 1.21 1.82 2.74 4.12 6.00 8.45 1.24 1.87 2.80 4.22 6.04 8.66 1.27 1.91 2.87 4.32 6.19 8.87 1.30 1.96 2.94 4.42 6.34 9.09 1.33 2.00 3.01 4.53 6.49 9.31 1.37 2.05 3.09 4.64 6.65 9.53 1.40 2.10 3.16 4.75 6.81 9.76 1.43 2.15 3.24 4.87 6.98 9.90 1.47 2.21 3.32 4.99 7.00 1/ Resistors having resistance values not listed herein, or in any other decade, shall be considered as not conforming to the specification.