Since the output impedance of Bode 100 is 50 Ω, the one-port measurement provides highest
sensitivity for a DUT having an impedance close to 50 Ω. The method is generally suitable to measure
impedance values between roughly 500 mΩ and 10 kΩ.
For measurements close to the limits of this method it is highly recommended to perform a careful
User-Range calibration to achieve best results.
Calibration
The One-Port impedance measurement mode does not require calibration to perform a measurement.
However, to achieve highest accuracy a calibration is recommended. Furthermore a calibration allows
to move the reference plane from the output port of Bode 100 to the end of a connection cable. This
compensates the effect of the connection cable.
For more details on how to perform an Impedance calibration please refer to 10.3.1 Calibrating a
Reflection or One-Port Impedance measurement on page 94.
Typical applications
Typical applications for the One-Port impedance measurement mode are:
• Measuring impedance of passive components.
• Measuring impedance of cables, piezo-elements or any one-port DUT.
One-Port measurement example
In this measurement example we will determine the series ans parallel resonance frequency of a 12
MHz quartz filter. Further on, we will display the quartz filter's reflection curve in a Smith chart.
Connect the input IN 2 of the test object "Quartz Filter" to the OUTPUT of Bode 100 using a BNC
cable. Further on, connect the BNC short delivered with Bode 100 to the corresponding output OUT 2.
The complete setup is shown in the figure below.
Figure 8-6: Connecting the test object Quartz Filter to Bode 100
Measurement types and applications
OMICRON Lab
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