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

FIGURE 4. Mounting straps for moisture-resistance test for polarized units only.

4.8.16 Shock (specified pulse)(see 3.22). Resistors shall be tested in accordance with method 213 of

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

a. Special mounting means: Resistors shall be mounted on appropriate jig fixtures with their bodies

restrained from movement and their leads supported 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 shock 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 longer than necessary. In all

cases, the resistors shall be mounted in relation to the test equipment in such a manner that the

stress applied is in the direction which would be considered most detrimental.

b. Measurements before shock: DC resistance shall be measured as specified in 4.8.3.

Test condition: I.

d. Number and direction of applied shocks: The resistors shall be subjected to a total of ten shocks

in each of two mutually perpendicular planes, one perpendicular and the other parallel to the

longitudinal axis of the resistor.

e. Measurements during shock: 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.

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

damage.