MIL-PRF-22684 Resistors, Fixed, Film \(Insulated\) General Specification ForThis specification covers the general requirements for insulated, film, fixed resistors of 2- and 5- percent resistance tolerance. These resistors are capable of full-load operation at an ambient temperature of 70 degrees C and have a resistance-temperature characteristic of +200 parts per million per degree Celsius \(ppm/degrees C\), \(see 6.1\). Designers are CAUTIONED on using these resistors in high power pulse applications \(see 6.10\).

Pages 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14

MIL-PRF-22684F

3.6 Voltage rating. Resistors shall have a rated direct current (dc) continuous working voltage or an approximate

sine-wave root-mean-square (rms) alternating current (ac) continuous working voltage at commercial-line frequency

and waveform corresponding to the power rating, as determined from the following formula:

E = (PR)

Where:

E = Rated dc or rms ac continuous working voltage at commercial-line frequency and waveform.

P = Power rating (see 3.1).

R = Nominal resistance (see 3.1).

In no case shall the rated dc or rms ac continuous working voltage be greater than the applicable maximum value

(see 3.1, table I and 6.5).

3.7 DC resistance, (see 6.6). When resistors are tested as specified in 4.6.2, the dc resistance shall be within the

specified tolerance of the nominal resistance (see 3.1).

TABLE I.

Maximum continuous working voltage.

Maximum

Power

continuous working

Style

rating

voltage (dc or rms)

watts

volts

RL07

1/4

250

RL20

1/2

350

RL32

500

RL42

500

3.7.1 Resistance value deviations. All maximum deviations as specified in this section are to be considered

absolute limits with the exception of the contact resistance adjustments.

3.8 Thermal shock. When resistors are tested as specified in 4.6.3, the resistors shall meet the following

requirements:

DC resistance:

Change shall not exceed �(1 percent + 0.05 ohm).

Visual examination:

There shall be no evidence of mechanical damage.

3.9 Low-temperature operation. When tested as specified in 4.6.4, the resistors shall meet the following

requirements:

DC resistance:

Change shall not exceed �(0.5 percent + 0.05 ohm).

Visual examination:

There shall be no evidence of mechanical damage.

3.10 Short-time overload. When resistors are tested as specified in 4.6.5, the resistors shall meet the following

requirements:

DC resistance:

Change shall not exceed �(0.5 percent + 0.05 ohm).

Visual examination:

There shall be no evidence of arcing, burning, or charring.