8. PERFORMANCE VERIFICATION
Periodic checks of the system are recommended to verify proper system operation. These periodic checks will satisfy some quality assurance requirements as specified in your quality assurance/control policy. A log is recommended, either hand written or computer managed, which will record the weight test results, sodium tartrate test results, and retained samples’ results. Shifts in results that are out of range can be quickly detected and the appropriate corrections made.
For maximum accuracy, let the system warm up until the balance is temperature stable before performing any testing (See section “6.1 Balance Temperature Stability” on page 64).
8.1. The Weight Test
The weight test, as described in the section beginning on page 22, simulates moisture loss with the removal of one of two known weights. This test may be used as part of your control verification program:
∙At the interval established by your quality assurance/control program;
∙Any time the unit is moved, the power switched off, the instrument is jarred or bumped; and/or
∙If there is any concern about the accuracy of the instrument.
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