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MIL-STD-690 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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MIL-STD-690D

w/ CHANGE 1

* 6.5 Changes notations. The margins of this standard are marked with asterisks to indicate modification generated by this change. This was done as a convenience only and the Government assumes no liability whatsoever for any

in accuracies in these notations. Bidders and contractors are cautioned to evaluate the requirements of this document based on the entire contact irrespective of the marginal notations.

TABLE VIII. Cumulative poisson probabilities.

0.01

0.02

0.03

0.04

0.05

.990

.980

.970

.961

.951

1.000

.999

1.000

0.06

0.07

0.08

0.09

0.10

.942

.932

.923

.914

.905

.998

.997

.996

.995

1.000

0.12

0.14

0.16

0.18

0.20

.887

.869

.852

.835

.819

.993

.991

.988

.986

.982

1.000

.999

1.000

0.22

0.24

0.26

0.28

0.30

.803

.787

.771

.756

.741

.979

.975

.972

.967

.963

.998

.997

.996

1.000

0.32

0.34

0.36

0.38

0.40

.726

.712

.698

.684

.670

.959

.954

.949

.944

.938

.996

.995

.994

.993

.992

1.000

.999

1.000

0.42

0.44

0.46

0.48

0.50

.657

.644

.631

.619

.607

.933

.927

.922

.916

.910

.991

.990

.988

.987

.986

.999

.998

1.000

0.52

0.54

0.56

0.58

0.60

.595

.583

.571

.560

.549

.904

.897

.891

.885

.878

.984

.982

.981

.979

.977

.998

.997

1.000

0.62

0.64

0.66

0.68

0.70

.538

.527

.517

.507

.497

.871

.865

.858

.851

.844

.975

.973

.971

.968

.966

.996

.995

.994

1.000

.999

1.000

0.72

0.74

0.76

0.78

0.80

.487

.477

.468

.458

.449

.837

.830

.823

.816

.809

.963

.961

.958

.955

.953

.994

.993

.992

.991

.999

1.000