You can choose the type of frequency points to use in obtaining user calibration data and fixture compensation data as follows:
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.
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Softkey |
Calibration/Compensation Points |
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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. |
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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 may become invalid. If the span is widen, calibration/compensation data acquisition is again required. If the span is narrowed, calibration/compensation data is interpolated. |
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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20, 50, 100, 200, 500, 1000, 1200, 1500, 1900, 2300, 2800, 3500, 4300, 5300, 6600, 8100 |