10.3.1 Calibrating a Reflection or One-Port Impedance
measurement
In this section you learn how to calibrate an Impedance, Reflection or Admittance measurement in the
Transmission / Reflection measurement mode or in the One-Port impedance measurement
mode.
The Transmission / Reflection mode offers the possibility to measure Transmission and Reflection
sequentially. Please note that the Impedance (Open/Short/Load) calibration is only applied to a
Impedance, Reflection or Admittance measurement. If you want to calibrate a Gain measurement
please refer to 10.2.1 Calibrating a Transmission (S21) measurement (see page 88).
In the Transmission / Reflection measurement mode or in the One-Port impedance measurement
mode both receivers are internally connected to the 50 Ω source resistance. Bode 100 is internally
calibrated such that it measures the Impedance/Reflection directly at the OUTPUT port of the device.
The reference plane is directly at the OUTPUT port (BNC connector).
When connecting a DUT with a coaxial cable, the cable introduces additional impedance and time-
delay. To compensate these effects, the reference plane can be moved to the end of the cable by
performing an Open/Short/Load calibration at the end of the cable.
Figure 10-4: Shifting the reference plane by performing Open, Short and Load Calibration
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OMICRON Lab
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