Sampling Inspection refers to the process of randomly taking a sample from the lot and inspecting the selected sample in order to determine either to accept or reject the lot.
Sampling Inspection is Required…
In destructive inspection (Tensile strength test, bulb and tube life test etc.)
When inspecting continuum or bulk goods.
When the mixture of defective products in some extent is considered to be acceptable.
With many check points.
When reducing inspection costs is more profitable.
When wanting to stimulate manufacturers to improve
the quality level.
Sampling Inspection is Favorable..
When the size of one lot is large and cost of 100% Inspection is a burden.
If the inspection results of some products can represent the whole lot.
When mixture of defective products in accepted lot is allowed to some extent.
Used when there is no reason to
suspect that the process average differs
from an AQL(Acceptable Quality Level).
02Tightened Inspection
Used when the inspection results of a
predetermined number of consecutive lots
indicate that the process average might
be poorer than the AQL.
03Reduced Inspection
The discriminatory ability under reduced
inspection is less than under normal inspection.
Used when the inspection results of a
predetermined number of consecutive
lots indicate that the process average might
be greater than the AQL.
