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MIL-PRF-39017 Resistors, Fixed, Film \(Insulated\), Nonestablished Reliability, And Established Reliability, General Specification ForThis specification covers the general requirements for nonestablished reliability \(non-ER\) and established reliability \(ER\), insulated, film, fixed resistors. These resistors are capable of full load operation at an ambient temperature of 70 Degrees C and have a resistance temperature characteristic of 100 parts per million \(PPM\) and 350 PPM per degree Celsius \(PPM/Degrees C\). The ER resistors have life failure rate \(FR\) levels ranging from 1.0 percent to 0.001 percent per 1,000 hours \(see 1.2.1.4\). These FR levels are established at a 60 percent confidence level on the basis of life tests. Designers are CAUTIONED on using these resistors in high power pulse applications \(see 6.13.2\).

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MIL-PRF-39017G
4.8.12 Dielectric withstanding voltage (see 3.18).
4.8.12.1 Atmospheric pressure. Resistors shall be tested in accordance with method 301 of
MIL-STD-202. The following details and exceptions shall apply:
a. Special preparations: Resistors shall be placed in a conductive material which will conform to the
resistor surface so that between 90 and 100 percent of the outer periphery is contacted. The
conductive material shall be centered on the resistor body. Care should be taken that any part of
the resistor lead is as far away from the conductive material as possible (see figure 3).
b. Initial measurement: DC resistance shall be measured as specified in 4.8.3.
Magnitude of test voltage: see 3.1.
c.
d. Nature of potential: An alternating current (ac) supply at commercial line frequency (not more
than 100 cycles per second) and waveform.
e. Duration of application of test voltage: 60 seconds.
f.
Rate of application of test voltage: 100 volts per second.
g. Points of application of test voltage: Between the resistor terminals connected together and the
conductive material (No longer mounted in a V-block).
h. Measurements after test: DC resistance shall be measured as specified in 4.8.3.
i.
Examinations after test: Resistor shall be examined for evidence of mechanical damage, arcing,
and breakdown.
METAL STRAP
FIGURE 3. Resistor-contacting assembly for dielectric strength.
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