Calibrating A Voltage/Current Measurement - Omicron Lab Bode 100 User Manual

For more details and practical examples on how to perform calibration in the Shunt-Thru or Series-
Thru measurement mode, please refer to the corresponding application notes on
lab.com.

8.3.5 Calibrating a Voltage/Current measurement

In this section you learn how to calibrate an Impedance, Reflection or Admittance measurement in the
Voltage/Current measurement mode.
The Voltage/Current measurement mode is based on an Gain measurement. Bode 100 measures
Gain from Channel 1 to Channel 2. Impedance equals Gain if Channel 1 receives a current signal and
Channel 2 receives a voltage signal. The Bode Analyzer Suite allows to either calibrate the underlying
Gain measurement using Thru calibration or to use Open/Short/Load compensation to move the
reference plane directly to the DUT.
The Voltage/Current measurement allows both, Thru or Open/Short/Load calibration.
However, only one calibration can be active at a time!
Even if both calibrations have been performed only one calibration is applied.
You must select the calibration you want to apply using the slider in the calibration dialog.
If the arrow points to the left, Thru calibration is applied.
If the arrow points to the right, Open/Short/Load calibration is applied (see example below).
Voltage/Current calibration connections
Calibrating Thru:
86
Load calibration.
Default Load Resistor value is 50 Ω.
Use a 1 Ω resistor for Thru calibration. 1 Ω results
in 1 V/A. Thru calibration can e.g. remove the
gain and phase error introduced by the probes.
However, it does not correct for systematic
measurement errors in the measurement setup
such as a voltage drop on the current probe or
the current flowing through the voltage probe.
These errors cannot be removed by one
calibration measurement. In such a case you can
use Open/Short/Load calibration to reduce these
errors.
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