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

4.8.17 Vibration, high frequency (see 3.23). Resistors shall be tested in accordance with method 204

of MIL-STD-202. The following details and exceptions shall apply:

a. Mounting of specimens: Resistors shall be mounted on appropriate jig fixtures and supported by

their leads at a distance of 0.25 inch from the resistor body. These fixtures shall be constructed

in a manner to insure that the points of the resistor mounting supports will have the same motion

as the vibration test table. The fixtures shall also be of a construction that will preclude any

resonance in the fixture when subjected to vibration within the test frequency range, and the

fixture shall be monitored for these features on the vibration table. Test leads used during this

test shall be no larger than AWG size 22 stranded wire, so that the influence of the test lead on

the resistor will be held to a minimum. The test lead length shall be no greater than is absolutely

necessary. A shielded cable which may be necessary because of the field surrounding the

vibration table shall be clamped to the resistor mounting jig.

b. Initial measurement: Use initial measurement of 4.8.16. (Requirement is 4.8.16 and 4.8.17

combined).

Test condition: D.

d. Direction of motion: In each of two mutually perpendicular directions, one perpendicular and the

other parallel to the longitudinal axis of the resistor. Six hours in each direction for a total of 12

hours.

e. Measurements during test: Each resistor shall be monitored to determine electrical discontinuity,

by a method which shall at least be sensitive enough to monitor or register, automatically, any

electrical discontinuity of 0.1 millisecond or greater duration.

Measurements after vibration: DC resistance shall be measured as specified in 4.8.3.

g. Examination after test: Resistors shall be examined for evidence of mechanical and electrical

damage.