1、EIA STANDARD ANSUEIA-585- 199 1 Approved: June 14, 1991 Reaffirmed: June 12, 1997 Reaffirmed: September 5, 2002 Zero Acceptance Number Sampling Procedures and Tables for Inspection by Attributes of Isolated Lots EIA-585 JUNE 1991 ELECTRONIC INDUSTRIES ALLIANCE GOVERNMENT ELECTRONICS AND INFORMATION
2、TECHNOLOGY ASSOCIATION 7- A SECTOR OF Electronic industries Alliance Copyright Government Electronics .I .i! .; I .; : , APPENDIX B TYPICAL SAMPLING PLANS . APPENDIX C F USE OF EIA STANDARD “ZERO ACCEPTANCE NUMBER SAMPLING PROCEDURES .“ . 25 11 Copyright Government Electronics ,3 B a. End items. b.
3、Components and raw material. These plans are designed for use with isolated lots,.and the Operating Characteristic curves are located in Appendix A. The manufacturers risk, which is approximately equal to the AQL values of MIL-STD-105, is of little concern to consumers and users of zero acceptance n
4、umber sampling plans. What is of interest is the level of nonconformances that will not be exceeded at a given confidence level, in any shipment of material to the consumer. Copyright Government Electronics this results in relatively simple equations for analyzing the sampling plans, as will be seen
5、 later. 3.2 USE The sampling plans of this document are intended for use with isolated lots of product. Appendix A includes the Operating Characteristic (OC) curves for isolated lot inspection plans. Appendix B includes typical sampling plans for different values of protection for five different lot
6、 proportion nonconforming levels. Selection of the appropriate sampling plan depends upon the amount of consumer protection desired for a selected PPM level of product quality desired, and the size of the lot when inspecting isolated lots of material. Appendix C explains how to use this document in
7、selecting the appropriate sampling plan. Copyright Government Electronics ccc WJUi !0000 P.9 90.0 I 5a.9 94.0 I 43.7 I 76.8 1 26.6 75.0 I 23.6 1000 PPH( 503l.3PM 95.0 92.0 65.9 88.4 1 53.9 87.5 51.2 80.0 50.0 68.5 32.7 15.0 3.1 200 PPM 1000 PPY 96.0 81.5 93.7 72.2 90.0 59.0 84.0 41.8 75.0 23. 7 60.0
8、 7 8 100 PPM 98.0 96.8 95.0 92.0 87.5 80.0 68.5 50.0 500 PPM 90.4 85.2 77.4 65.9 51.3 32.8 15.1 3.1 LOO00 PQY!60000 PP.1 10.3 I - !CQOU ;PY!30000 PEP! 36.5 1 20.? -I - -I io000 P3Y 59.7 15000 PPM 46.1 28.4 15.5 13.3 - - - 2900 PPM 3000 PPM 66.5 1 50.2 52.1 37.6 34.8 20.5 7.3 1000 PPI4 81.7 59.9 43.3
9、 26.3 10.7 72.6 1 - - 1500 PPM 73.8 61.9 46.3 28.6 13.5 3.5 - - I Np = 20 I !OOOCl PPM - -i - -i 0000 PP1 35.5 10.6 8.3 0.7 - - - 12.1 3.0 - - :o00 PPH 66.7 52.7 35.8 18.8 6.9 - - - To determine equivalent PPM levels of proportion nonconforming ), simply divide the given value for Np by the lot size
10、 (N) and multiply by 1 million. For Np = 5 and a lot size of N = 500, the equivalent proportion nonconforming would be p = 10,000 PPM, as shown in the body of the table. Copyright Government Electronics x L O T I I I I W I L f 10 B E L * X 1 fL 9 % LOT SIZE OF 250 OPERATING CHARACTERISTIC CURVES 1 O
11、0 I 80 i l I I 1 I .i 70 I i I i 1 60 I I I, *I I I I 501 : + I 20 f I i 1 Copyright Government Electronics IC + . x + b *=. +*- lo O x LOT SIZE OF 500 OPERATING CHARACTERISTIC CURVES * :t, . $ N=5000 (Np=2) SAMPLE SIZE (n) Pr:%) N=7500 (Np=Y) 200 315 500 900 1250 2000 3150 5000 8.0 12.6 20.0 32.0 5
12、9.0 80.0 - - Fr(X) N=l O000 ( NP=A 1 7.8 12.0 18.6 23.4 Al .4 59.9 79.0 03.2 Pr = PROBABILITY OF REJECTION = 1 - Pa Pr IS ALSO THE CONFIDENCE WITH WHICH THE LOT PROPORTION NONCONFORMING MAY BE CLAIMED TO NOT EXCEED 400 PPM IF THE LOT IS ACCEPTED (Le., IF THE SAMPLE CONTAINS NO NONCONFORMING ITEMS). Pa = jN - ND)!N - n)! (N - Np - n)!N! Copyright Government Electronics & Information Technology Association Reproduced by IHS under license with GEIA Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-
