Z0 is the system impedance of a measurement path. Normally, it is equal to the impedance of the calibration standards used for calibration. The Z0 value should be specified before calibration, as it is used for calibration coefficient calculations.
For waveguide calibration, the system impedance must be set to 1 Ω.
The impedance of both test ports is the same for most of measurement types. The Analyzer can perform measurements when Z0 values of the test ports are different, for example, Type N50 – Waveguide. For such measurements, use different impedance settings for the test ports, Z01 and Z02.
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To calibrate the Analyzer with different port impedances, Z01 and Z02, the following methods are provided: Adapter Removal, Unknown Thru Addition (described in Non-Insertable Device Measuring). |
Manual Z0 Setting
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To set the system impedance Z0, use the following softkeys: Calibration > System Zo > Port n Zo |
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Automatic Z0 Selecting
The automatic system impedance selecting function sets Z0 during the process of calibration standard measurement, using data from the definition of the calibration standard in a calibration kit. Z0 of the corresponding port is set when measuring one-port standards. Z0 of the two ports is set when measuring two-port standards. The UNKNOWN THRU standard does not make any changes in Z0 of the ports. By default, the function is enabled, but it can be disabled.
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To enable/disable the function of automatic selecting of port impedance Z0, use the following softkeys: Calibration > System Zo > Auto Select Zo > [ON|OFF] |
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