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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PARAGRAPH

1.

CONTENTS

SCOPE

PAGE

1

1.1

Purpose

1

1.2

Application

1

1.3

Method of reference

1

2.

APPLICABLE DOCUMENTS

2

2.1

General

2

2.2

Government documents

2

2.2.1

Specifications, standards, and handbooks

2

2.3

Order of precedence

2

3.

DEFINITIONS

3

3.1

Reliability terms

3

4.

GENERAL REQUIREMENTS

5

4.1

FR levels

5

4.1.1

FR level determination

5

4.1.2

Qualification approval for higher FR levels

5

4.1.3

Supplying to higher FR levels

5

4.1.4

FR marking

5

4.1.4.1

FR marking upgrading

6

4.2

Failure criteria

6

4.3

FR test records

6

4.4

Exemption of data

6

4.5

FR qualification procedures

6

4.6

Lot conformance FR inspection procedure (when specified)

7

4.7

Disposition of sample units

7

5.

DETAILED REQUIREMENTS

11

5.1

Procedure I, "Qualification at the initial level"

11

5.1.1

Applicable data

11

5.1.2

FR sampling plans (FRSP)

11

5.1.2.1

True failure rates for FRSP-60 and FRSP-90

12

5.1.3

Failure FR test

12

5.1.4

Failure to qualify

12

5.1.5

Details to be specified

12

5.2

Procedure II, "Extension of qualification to lower FR levels"

13

5.2.1

Applicable data

13

5.2.2

Extend and limitation of coverage

13

5.2.3

Details to be specified

13

5.2.4

Extension of failure rate (optional)

14

5.3

Procedure III, "Maintenance of FR level qualification"

14

5.3.1

Applicable data

15

5.3.2

FR sampling plans

15

5.3.3

Failure to maintain FR level qualification (see 4.3)

17