10.3 Performing an Impedance Calibration
Impedance calibration (also called Open/Short/Load calibration or OSL calibration) can be used to
compensate the parasitics of a measurement setup such as an external directional coupler or a
measurement bridge. Furthermore it can be used to shift the reference plane of a one-port reflection
measurement from the Bode 100 output port to the end of a cable of arbitrary length. This is achieved
by measuring known Open, Short and Load elements.
To achieve maximum accuracy, do not change the attenuators after having performed an
external calibration.
Performing a Open/Short/Load calibration
In order to perform an Open/Short/Load calibration please proceed as follows:
1. Build up the calibration setup. For details on the correct calibration setup, please check the
following chapters.
2. In the Bode Analyzer Suite, click on an Impedance calibration icon (either User-Range or Full-
Range). To learn more about the difference between Full-Range and User-Range calibration
please see 10.3.1 Difference between Full-Range and User-Range calibration on page 103.
3. In the calibration dialog, the calibration state shows Not Performed for all three calibration points.
Connect the Open calibrator and press Start.
Wait until the Open calibration has completed and the calibration state shows Performed.
4. Connect the Short calibrator and press Start.
5. Connect the Load calibrator and press Start.
Calibration / Correction
OMICRON Lab
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