4-18 PN: 10580-00343 Rev. H S820E UG
4-3 Calibration Procedures Calibration, CAA
Interpolation
If Interpolation is set to Off and the current Cal Correction is On and valid, you
cannot modify the frequency range or the source power level, or increase the
number of points above 1033 points (assuming the calibration was performed
with 1033 points or less). Any of these changes will require the active
calibration to be turned Off and a new calibration to be performed. You can,
however, adjust the number of points from 130 to 1033 without forcing the
calibration to become invalid. To use 2065 points, the number of points must
be set to 2065 before the calibration is started.
If your current Cal Correction is On and you turn Interpolation On, you can
then change the frequency range (smaller and anywhere within the
calibrated range) or modify the number of points to be higher than 1033
without invalidating the calibration. In that case, the calibration coefficients
are regenerated (interpolated) to match the new settings. You cannot
increase the frequency range, however, beyond the range that was used
during calibration.
For example, you could perform a calibration from 1 MHz to 20 GHz using
2065 points. With Interpolation On, you could then make a measurement by
zooming in on a desired frequency range, 410 MHz to 435 MHz, for example.
The trace in your measurement would use the full 2065 points within this
much narrower frequency range.
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