Full inspection (quality management)
Full inspection (also called full inspection , piece-by-piece inspection or 100% inspection ) is a term from quality management and stands for the complete inspection of all products in a production batch for parts with defects ( rejects ). The full test is also referred to as sorting .
definition
A full test is the review of all produced units with regard to the specified test features . In contrast to this, only a part of the units is checked in the random sample check.
DIN 55350-17 defines the 100% test as a quality test on all units of an inspection lot .
Differentiation from other types of test
The full test must not be confused with the full quality test according to DIN 55350-17, which is defined as a quality test with regard to all quality features.
A full test in which all defective units found are sorted out is called a sorting test .
If, during a full test, the units are classified into classes for further use in accordance with the results of the determination, one speaks of a class test (classification according to DIN 55350-23 ).
Types of errors in the full test
The following types of errors are distinguished in the full inspection:
- Critical error: error that is dangerous for people using the unit or creates an unsafe situation or error that endangers the function of a unit
- Main fault: not critical, but can lead to failure
- Minor error: error that does not significantly reduce usability. Slight deviation from the specifications.
Expediency of a full audit
The full test is useful if the manufacturing process is not yet under statistical control or if the costs of the consequential error significantly exceed the test costs. The full inspection of vital parts or for batch releases of raw materials, where the quality of the finished product can change, is imperative. If the proportion of defective parts exceeds a defined limit during a random test, a 100% test is initiated in many manufacturing processes in order to eliminate defective parts from the subsequent production steps at an early stage.