6-40 PN: 10580-00343 Rev. H S820E UG
6-17 Sweep Menu 3 VNA Mode
Reference Plane Extension Auto
This submenu key is used to automatically determine the best distance or
time to mathematically extend the reference plane (Plane of Calibration) in
order to remove an appropriate amount of linear phase rotation from the
measurement data. The resultant display will unwrap phase (refer to “Phase
versus Unwrapped Phase Graph Types” on page 6-8) to allow a better view of
the phase properties of the Device Under Test. This function can be applied to
a reflection measurement (S
11
for port 1 or S
22
for port 2) or to a transmission
measurement (S
21
for port 1 or S
12
for port 2), depending on the user setup.
To determine the appropriate phase rotation, and depending on your display
settings, you may be presented with a message box (see Figure 6-31) asking
you to specify to which S-parameter the reference plane extension should be
applied. The calculated distance value or time value for each port is displayed
in the Instrument Settings Summary above the graph area.
Figure 6-31. Message Boxes for Reference Plane Extension
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