10.2 Performing a Gain Calibration
Gain calibration (also called Thru calibration) is used to remove the gain and phase error introduced
by the connections between the measurement instrument and the DUT in a gain or transmission
measurement.
To achieve maximum accuracy, do not change the attenuators after having performed an
external calibration.
Thru calibration can also be used in impedance measurements that are based on a gain
measurement. These measurement modes are e.g. Shunt-Thru, Series-Thru or Voltage/
Current. When performing a Thru calibration in such a mode, the underlying gain
measurement is calibrated and afterwards the calibrated gain result is transformed to
impedance.
Performing the calibration
In order to calibrate a gain measurement, please proceed as follows:
1. Build up the calibration setup. For details on the calibration setup, please see 10.2.1 Calibrating a
Transmission (S21) measurement on page 88 or 10.2.2 Calibrating a Gain/Phase
measurement on page 89.
2. In the Bode Analyzer Suite, click on the Gain calibration icon (either User-Range or Full-Range).
To learn more about the difference between User-Range and Full-Range calibration please check
10.3.1 Difference between Full-Range and User-Range calibration on page 103.
3. The calibration dialog opens and the calibration state shows Not Performed.
4. Ensure that the calibration setup is connected properly and press Start.
5. Wait until the calibration has completed and the calibration state shows Performed.
6. Close the calibration dialog.
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