MIL-R-19365 Resistor, Adjustable, Wirewound, PowerThis specification covers power, adjustable, wirewound, resistors for use in electrical, electronic, communication, and associated equipment. These resistors have a resistance range of 1 ohm to 15,000 ohms, inclusive, and a resistance tolerance of ┬▒5 percent. The power ratings cover a range of 11 watts to 210 watts, inclusive. These power ratings are applicable only when the maximum resistance is engaged in the circuit. When only a portion of the resistance element is engaged, the power rating is reduced in approximately the same proportion as the resistance.

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MIL-R-19365E

25

120

100

80

60

40

20

0

2

AMBIENT TEMPERATURE IN OC

0

350

FIGURE 1.  Derating curve for ambient temperatures.

1.2.1.3  Resistance.  The nominal resistance value expressed in ohms is identified by a three digit number; the first two digits 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 10 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 last digit becomes significant.  The following are examples of symbols for resistance values:

1.2.1.3.1  Decade of resistance values.  Resistance values in all decades for all styles will correspond to the values specified in the 10 to 100 decade in accordance with table II.

TABLE II.  Resistance values.

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