Automated Signal Generator Level Characterization and Verification

Automatic test systems are described that are used to characterize and verify the output level performance of signal generators using internally stored correction data applied under microprocessor control. The characterization technique allows user verification of output level performance by direct measurement with a conventional power meter. Particular emphasis is given to a level verification system capable of measuring output power from +20 dBm to less than -140 dBm in a frequency range of 100 kHz to 2.5 GHz with an uncertainty of less than 1 dB. An analysis of error factors and actual performance data is presented.