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MIL-PRF-18546 Resistors, Fixed, Wire-Wound \(Power Type, Chassis Mounted\), General Specification ForThis 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/Degrees C to 200 ppm/Degrees C depending upon the resistance value. They are not capable for application when the alternating current \(ac\) characteristics are of critical importance; however, provisions have been made to minimize the inductance.

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MIL-PRF-18546G
4.7.6 Dielectric withstanding voltage (see 3.10).
4.7.6.1 Atmospheric pressure. Resistors shall be tested in accordance with method 301 of MIL-STD-
202. The following details shall apply:
a. Special preparations: Resistors shall be mounted firmly on a metal plate by means of the normal
mounting hardware. The plate shall be of sufficient size to extend beyond the resistor extremities.
b. Magnitude of test voltage: As specified in 3.1.
c. Nature of potential: An ac supply at commercial line frequency and waveform.
d. Points of application of test voltage: Between the terminals tied together and mounting plate,
making certain that there is good electrical contact between the metal of the mounting tab, if any,
and mounting plate.
e. Measurements and inspection: Resistance (see 4.7.2) shall be measured before the test. At the
conclusion of the test, resistors shall be inspected for evidence of damage, arcing, flashover, and
insulation breakdown.
4.7.6.2 At reduced barometric pressure. Following the test specified in 4.7.6.1, resistors shall be
tested in accordance with method 105 of MIL-STD-202. The following details shall apply:
a. Method of mounting: As specified in 4.7.6.1a.
b. Test condition C.
c. Magnitude of test voltage: As specified in 3.1.
d. Nature of potential: As specified in 4.7.6.1c.
e. Points of application of test voltage: As specified in 4.7.6.1d.
f. Measurements and inspection: At the conclusion of the test, resistance shall be measured (see
4.7.2). Resistors shall also be inspected for evidence of damage, arcing, flashover, and insulation
breakdown.
4.7.7 Insulation resistance (see 3.11). Resistors shall be tested in accordance with method 302 of
MIL-STD-202. The following details shall apply:
a. Test condition A.
b. Special preparations: As specified in 4.7.6.1a.
c. Points of measurement: As specified in 4.7.6.1d.
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