E4990A Help
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1. Press the Cal > Compen Point > Fixed freq|User freq to select the
measurement points used for user calibration or those for fixture
compensation.
Fixed freq setting always assumes OSC Level as set to 0.5
V, even if its set to any other level. If you would like to perform
calibration sweep with a specific OSC level other than 0.5 V, set the
calibration/compensation point to User freq.
Softkey
Calibration/Compensation Points
Fixed
freq
Obtain calibration/compensation data at fixed frequency
points covering the entire frequency range of the E4990A. In
device measurement, user calibration or fixture compensation
is applied to each measurement point by using interpolation.
Even if the measurement points are changed by altering the
sweep setups, you don't need to retake the
calibration/compensation data.
User
freq
Obtain calibration/compensation data at the same frequency
points as used in actual device measurement, which are
determined by the sweep setups. Each set of
calibration/compensation data is applied to each
measurement at the same point. If measurement points are
changed by altering the sweep setups,
calibration/compensation data become invalid and
calibration/compensation data acquisition is again required.
The calibration/compensation data point selection set by
the Compen Point key is common for user calibration and fixture
compensation. You cannot set the selection for either one of them
independently.
When the selection of calibration/compensation data points
is changed after completing user calibration or fixture compensation,
the obtained user calibration or fixture compensation data become
invalid. Therefore, do not change the selection of the
calibration/compensation data points after completing user
calibration or fixture compensation.
List of Fixed Calibration/Compensation Frequency Points
When the fixed frequency points for user calibration and fixture
compensation are selected (Compen Point > Fixed freq),
calibration/compensation is performed at the frequency points listed
below:
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