MagTek InSpec 9000-2005 - Manual (Page 20)

InSpec 9000-2005 Encoded Card Tester
10
ANSI/ASQC Z1.4 - 1993, American National Standard, Sampling Procedures and Tables for
Inspection by Attributes, American Society for Quality Control.
In the following table, the "Single Normal Plan, General Inspection Level I, AQL .010"
designates the criteria used in sampling. In the Table, the Lot Size is equivalent to the card
production run; the Sample Size is the number of randomly selected cards to be run on the
Tester; the Accept and Reject columns are the number of samples for rejecting or accepting the
Lot. If, for example, Accept is 1 and Reject is 2, the Lot will be accepted if there is 1 card out of
spec, but rejected if there are 2 cards out of spec. If the Lot is rejected, the process is repeated.
If rejected again, 100% evaluation is required.
Example of Single Normal Plan, General Inspection Level I, AQL .010
Lot or Batch Size Sample Size Accept Reject
2 to 8 All 0 1
9 to 15 All 0 1
16 to 25 All 0 1
.
.
.
151 to 280 13 0 1
281 to 500 20 0 1
501 to 1200 32 0 1
The following procedure is only an example using ANSI/ASQC Z1.4 - 1993 as a guideline for
sampling:
1.
Determine the Lot size, and remove the number of samples listed in the table.
2.
For a Lot size of 501 to 1200, remove 32 samples and run them on the
Tester.
3.
If all 32 cards are within spec, accept the Lot.
4.
If 1 card is out of spec, repeat steps 2 and 3.
5.
If 1 card is out of spec, test the entire Lot.
Consult ANSI/ASQC Z1.4 - 1993, for actual techniques and values for sampling.