The "Performance Check Procedure" is used to verify the instrument's Performance Requirements as listed in the "Specification" (Section 1) and to determine the need for readjustment. These checks may also be used as an acceptance test, as a preliminary troubleshooting aid, and as a check of the instrument after repair. Removing the instrument's cover is not necessary to preform this procedure. All checks are made using the operator-accessible front- and rear-panel controls and connectors.

To ensure instrument accuracy, its performance should be checked after every 2000 hours of operation or once each year, if used infrequently.

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