5 CALIBRATION AND CALIBRATION KIT
98
Figure 5.3 Test port defining
In some cases, the term of calibration plane is used. Calibration plane is an imaginary
plane located at the ends of the connectors, which accept calibration standards during
calibration.
5.1.5 Calibration Steps
The process of calibration comprises the following steps:
§Selection of the calibration kit matching the connector type of the
test port. The calibration kit includes such standards as SHORT,
OPEN, and LOAD with matched impedance. Magnitude and
phase responses i.e. S-parameters of the standards are well
known. The characteristics of the standards are represented in the
form of an equivalent circuit model, as described below;
§Selection of a calibration method (see section 5.1.6) is based on
the required accuracy of measurements. The calibration method
determines what error terms of the model (or all of them) will be
compensated;
§Measurement of the standards within a specified frequency range.
The number of the measurements depends on the type of
calibration;
§The Analyzer compares the measured parameters of the standards
against their predefined values. The difference is used for
calculation of the calibration coefficients (systematic errors);
§The table of calibration coefficients is saved into the memory of
the Analyzer and used for error correction of the measured results
of any DUT.
Calibration is always made for a specific channel, as it depends on the channel stimulus
settings, particularly on the frequency span. This means that a table of calibration
coefficients is being stored each for an individual channel.
Port
1
Adapters
Port
2
Port
1
Port
2
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