MIL-STD-690-SUP Failure Rate Sampling Plans and ProceduresThis standard provides procedures for failure rate FR qualification, sampling plans for establishing and maintaining FR levels at selected confidence levels, and lot conformance inspection procedures associated with FR testing for the purpose of direct reference in appropriate military electronic parts established reliability ER specifications. Figures and tables throughout this standard are based on exponential distribution. Weibull distribution will be acceptable in certain components such as capacitors. Use of Weibull distribution for any component must be approved by the qualifying activity. This standard also provides guidance to specification writers in the use of this standard see appendix A and references material for users of ER parts.

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CONTENTS

PARAGRAPH

PAGE

FIGURES

1.

Examples of FR test records

7

2.

Examples of maintenance of FR level record

10

I.

FRSP-60

11

II.

FRSP-90

11

III.

True failure rate for FRSP-60 and FRSP-90 (prepared for 1%/1,000 hr FR level)

12

IV.

FRSP-10

16

V.

True failure rate for FRSP-10 (prepared for 1 percent per 1,000 hours FR level)

16

VI.

Example of sublot calculation plan

18

VII.

Lot conformance FR plan

19

VIII.

Cumulative Poisson probabilities

22

A-I.

FR qualification data in unit hours (based on exponential distribution computed at 1%/1,000 hr)

31

A-II.

True failure rates for C = 0 (level M)

32

A-III.

True failure rates for C = 1 (level M)

30

A-IV.

True failure rates for C = 2 (level M)

33

A-V.

True failure rates for C = 3 (level M)

33

A-VI.

True failure rates for C = 4 (level M)

34

A-VII.

True failure rates for C = 5 (level M)

34

A-VIII.

True failure rates for C = 6 (level M)

35

A-IX.

True failure rates for C = 7 (level M)

35

A-X.

True failure rates for C = 8 (level M)

36

A-XI.

True failure rates for C = 9 (level M)

36

A-XII.

True failure rates for C = 10 (level M)

37