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For a single frequency, the frequency and pk-pk amplitude are specified in the UI. Clicking Generate Wander starts the generation of this tone; the measurement then runs for 10 secondsa duration dependent on the frequency. The pk-pk output amplitude is measured across the full 10 second capture. The gain is then calculated and the result presented on the UI.
The measurement method for single sine has not changed in X.10.40.
Note that if there is any transient following the application of the single sine wander, this will be included in the measurement result i.e. there is no facility for a recovery time
Testing using a Table of Frequencies
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These assumptions then allow us to set lower and upper limits as shown in the diagram below:
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Recovery Time
The frequency and amplitude changes between steps in the table will cause a short transient in the DUT output due to the action of the internal filter. This is a normal response of a filter to the change in stimulus, but it will result in incorrect pk-pk amplitude measurements and so should be ignored when making measurements. Therefore a “recovery time” is used to ignore the output during the first few seconds after each change in frequency.
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