Typically subsets of the performance tests. The purpose of operational verification tests is to verify instrument operation quickly with reasonable confidence. Operation verification procedures typically execute faster than calibration procedures because fewer points may be tested or a test system that is less accurate than the test system used for calibration procedures is used. They are usually performed after a repair or by customers as an incoming inspection. Normally, operation verification procedures test only the major parameters covered by specifications. Operation verification procedures do not verify that a product meets all specifications.