How The Transmission Measurement Works - HP 8712ET User Manual

Figure 3-32
Figure 3-33
Making Measurements
Measuring Impedance Magnitude
Impedance Calculation for Reflection Measurements

How the Transmission Measurement Works

In a transmission measurement, the data can be converted to its
equivalent mathematical series impedance using the model and
equations shown in
Transmission Measurements."
Impedance Calculation for Transmission Measurements
In the formula shown above, T is the complex transmission response.
The complex impedance, Z
analyzer displays the magnitude of Z
two-port Z-parameter conversion, as only the measured parameter is
used in the equations.
Since the enhanced response calibration cannot correct for load match
errors, the results of the transmission transform are less accurate than
the reflection transform. To minimize these errors, a good load match is
recommended. One way to achieve this is to use an attenuator on the
3-64
Figure 3-33, "Impedance Calculation for
, is computed based on T and Z
Trans
Trans
. This is not the same as a
ET User's Guide
. The
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