Figure 10-7: User-Range calibration; measurement frequencies and calibration frequencies are
congruent.
Figure 10-8: Full-Range calibration; correction factors are interpolated at measurement frequencies.
If Full-Range calibration is applied, the correction factors are available at the pre-defined frequencies
only. Correction factors for the measurement frequencies are calculated by interpolating between the
measured points.
Full-Range calibration is by default performed from 10 Hz to 50 MHz. If you need to calibrate
below 10 Hz, check out 10.3.4 Full-Range calibration below 10 Hz on page 106
In a single-frequency measurement the User-Range calibration will contain only one
frequency.
In a frequency sweep measurement the User-Range calibration contains exactly the same
amount of points as the sweep measurement.
Advantage of the Full-Range calibration
Full-Range calibration allows you to change the measurement frequencies without losing the
calibration. Since the correction values are interpolated, they can be interpolated for all frequencies
chosen in the measurement.
Advantage of the User-Range calibration
User-Range calibration does not use interpolation. The correction values are measured at exactly the
same frequencies as used in the measurement. This results in highest accuracy especially when using
long cables or narrow-band probes that show significant gain/phase shift in the measurement range.
User-Range calibration is deleted immediately when the measurement frequencies are
changed!
104
OMICRON Lab
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