keep the copy for your calibration test record. This record could prove valuable in tracking gradual changes in test results over long periods of time.

Frequency and amplitude self-calibration

Perform the frequency and amplitude self-calibration routines at least once per day, or if the analyzer fails a veri￿cation test. To perform self-calibration,

press 4CAL5 then CAL FREQ & AMPTD . The instrument must be up to operating

temperature in order for this test to be valid. Press CAL STORE when the test is complete. If the analyzer continuously fails one or more speci￿cations, complete any remaining tests and record all test results on a copy of the test record.

Then refer to the \Customer Support" chapter for instructions on how to solve the problem.

Periodically verifying operation

The analyzer requires periodic veri￿cation of operation. Under most conditions of use, you should test the analyzer at least once a year with either operation veri￿cation or the complete set of performance veri￿cation tests.

1-10 Calibrating