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

4.7.1 Sampling plan. If more than 1,000 resistors of any style or style grouping are produced over the

maintenance period, the group C tests shall be performed as specified. If the production rate is less than

1,000 resistors for any style or style grouping over the maintenance period then the monthly, quarterly, or

semi-annual group C inspection may be postponed until at least 1,000 resistors of that style or style

grouping are produced (except for the monthly life test). In any case, the monthly tests shall be

performed at least once every 3 months. The quarterly tests shall be performed at least every 6 months

and the semi-annual tests shall be performed at least once every year. This requirement is waived if the

manufacturer has obtained a reduced inspection status through the qualifying activity.

All qualified styles may be grouped together in a single sample. This can be accomplished by

proportion based on manufacturing percentages by style, equally divided by style, or by establishing an

alternating style sequence. In order to incorporate a style sampling grouping, a written description must

be presented and approved by the qualifying activity. This plan must assure that the grouping only

combines styles of the same basic design, encapsulation material, and the same element type.

4.7.2 Monthly.

4.7.2.1 Subgroup 1. Test samples shall be selected for each inspection lot produced during a 1 month

period. These samples shall be accumulated and placed on the life test as specified in 4.8.18, once a

month, for the full 10,000 hour life test period. The test sample size shall be determined by the

manufacturer so that the unit hours generated meets the maintenance of qualification requirements

specified for the qualified FR level (see 4.4.4). In any event a minimum of 5 samples shall be selected

from each lot. As far as practicable, the resistance values tested during a maintenance period shall be

representative of all resistance decades produced during this period. The accumulated data shall be

used for maintenance and extension of FR qualification.

4.7.2.2 Subgroup 2. Each month the tests specified in subgroup 2 shall be performed on sample units

of each style and selected from lots produced during the previous month that have passed group A and

group B inspection. For sample units without a critical value (see table XIV), ten sample units of the most

populous, highest decade value produced during the period shall be inspected. One defective shall be

allowed for each subgroup.

4.7.3 Quarterly. Every 3 month, ten sample units of each style and characteristic and of any resistance

value shall be subjected to the tests specified in table XIV, in the order shown.

4.7.4 Semiannual. Sample units and tests shall be as specified in table XIV. The test sample shall

include all styles allowed to combine for lot formation (see 4.6.2) as practicable. A complete separate

sample shall be selected for each enclosure material.

4.7.5 Disposition of sample units. Sample units which have been subjected to group C inspection shall

not be delivered on the contract or purchase order.