Normal Inspection
Meaning ~ Normal inspection defines the default statistical sampling plan used to accept or reject production lots based on stable history and standard risk levels.
General Inspection Level Ii
Meaning
Sampling standards within the ISO 2859-1 framework that establish the default relationship between lot size and the number of units tested. In most international trade contracts, general inspection level ii represents the industry standard for normal inspection. These standards provide a balance between the cost of testing and the reliability of the quality result.
Default Sensitivity
Inspectors use this level when there is no specific reason to believe the quality is exceptionally high or low. Applying general inspection level ii allows for a sample size that is large enough to catch major errors without stopping the production line. It remains the most common choice for consumer electronics and apparel.
Lot Relationship
Tables provided in the standard show how the sample size increases as the batch size grows. For a batch of three thousand units, general inspection level ii typically requires the checking of one hundred and twenty-five pieces. This mathematical link ensures that the statistical confidence remains consistent across different shipment volumes.
Smaller lots require a higher percentage of units to be checked while larger lots benefit from statistical efficiencies.
Discrimination Power
Selecting this level provides more protection than special inspection levels but less than level three. It is designed to identify shipments where the defect rate exceeds the acceptable quality limit. Using a lower level might save time but it increases the risk that a bad batch will be accepted by mistake.