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Operating Concepts
Calibration Routines
Calibration Routines
There are twelve different error terms for a two-port measurement that can be corrected
by accuracy enhancement in the analyzer. These are directivity, source match, load match,
isolation, reflection tracking, and transmission tracking, each in both the forward and
reverse direction. The analyzer has several different measurement calibration routines to
characterize one or more of the systematic error terms and remove their effects from the
measured data.
The calibrate menu allows you to perform the measurement calibration routines. These
procedures range from a simple frequency response calibration to a full two-port
calibration that effectively removes all twelve error terms.
Response Calibration
The response calibration, activated by pressing the softkey within the
calibrate menu, provides a normalization of the test setup for reflection or transmission
measurements. This calibration procedure may be adequate for measurement of well
matched devices. This is the simplest error-correction to perform, and should be used when
extreme measurement accuracy is not required.
Response and Isolation Calibration
The response and isolation calibration, activated by pressing the
softkey within the calibrate menu, provides a normalization for frequency response and
crosstalk errors in transmission measurements, or frequency response and directivity
errors in reflection measurements. This procedure may be adequate for measurement of
well matched high-loss devices.
Enhanced Response Calibration
The enhanced response calibration, activated by pressing the
softkey within the calibrate menu, provides a one-port calibration to correct for directivity,
source match, and frequency response for reflection measurements, and corrects for source
match as well as frequency response for transmission measurements.
For ES models, enhanced response calibration improves accuracy in transmission
measurements compared to a response calibration or a response and isolation calibration,
but it is not as accurate as a full 2-port calibration. For ET models, this calibration
provides the best accuracy for measurements with a T/R test set.
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