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Calibrating for Increased Measurement Accuracy
Calibration Considerations
NOTE The preset state of the instrument can be configured so that interpolated error correction is
on or off. Press
to configure the preset state of
interpolated error correction.
System performance is unspecified when using interpolated error correction. The quality of the interpolated
error correction is dependent on the amount of phase shift and the amplitude change between
measurement points. If phase shift is no greater than 180 per approximately five measurement points,
interpolated error correction offers a great improvement over uncorrected measurements. The accuracy of
interpolated error correction improves as the phase shift and amplitude change between adjacent points
decrease. When you use the analyzer in linear frequency sweep, perform the original calibration with at
least 30 points per 1 GHz of frequency span for greatest accuracy with interpolated error correction.
Interpolated error correction is available in three sweep modes: linear frequency, power sweep, and CW
time.
NOTE If there is a valid correction array for a linear frequency sweep, this may be interpolated to
provide correction at the CW frequency used in power sweep or CW time modes. This
correction is part of the interpolated error-correction feature.
Error-Correction Stimulus State
Error correction is only valid for a specific stimulus state, which you must select before you start a
correction. If you change any of the following parameters, you will invalidate the correction and the analyzer
will switch the correction off (unless the interpolated error correction feature is activated):
•frequency range
• number of points
•sweep type
The error correction quality may be degraded (Cor changes to C), if you change the following stimulus
state parameters:
•sweep time
• system bandwidth
•output power
If correction is turned off or shows C, the original stimulus state can be recalled by, first, turning
interpolation off (
), and toggling correction off and then on
( ).
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