HP 8712ET User Manual page 117

Making Measurements
Measuring Impedance Magnitude
load side of the device, as shown in Figure 3-34. If you choose to do this,
be sure to connect the attenuator before performing the enhanced
response calibration.
When interpreting the resulting impedance measurement, remember
that the analyzer is computing a transform and displaying the
equivalent series impedance. If your device has significant shunt
impedance, the results may differ significantly from the expected series
impedance.
Figure 3-34 Equipment Setup for a Transmission Measurement of Impedance
Magnitude
ET User's Guide 3-65