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The marker onscreen readout can be changed to formats other than the display
format. Learn how to set marker format on page 153.
How to select a NA Format
Press Measure 1.
Then
Then choose from the following:
NOTE
Phase is unwrapped by comparing the phase from one data point to the next. If
the phase difference between two data points is greater than 180 degrees, or if
the phase of the first data point is greater than 180 degrees from DC, than the
phase measurement is probably NOT accurate. Increase the resolution setting to
ensure that the phase measurement is accurate.
Frequency Range
Set the range of frequencies over which you would like to make measurements.
When the frequency range is changed after a calibration is performed, the cal
becomes interpolated. Learn more on page71.
How to set Frequency Range
This can be done in two ways:
Press Freq/Dist
Then choose from the following:
NA (Network Analyzer) Mode
Format [current
setting].
Log Magnitude
Displays magnitude in dB
o
Linear
Displays positive values only. Y-axis: Unitless (U) for ratioed
o
measurements; Watts (W) for unratioed measurements.
VSWR
Used mainly for S11 and S22. Displays unitless reflection data.
o
Phase
Displays phase in degrees. The trace 'wraps' every 360 degrees, from
o
+180 to –180, for easy scaling.
Smith
Used mainly for S11 and S22. Displays series resistance and
o
reactance.
More
then...
o
Polar
Used mainly for S11 and S22. Displays magnitude and phase of the
o
reflection coefficient.
Group Delay
Used mainly for S21 and S12. Displays signal transmission
o
(propagation) time through a device in seconds. The Group Delay aperture is
the current Smoothing aperture. Default is 1.5 % of the X-axis.
o
Learn how to set Smoothing aperture on page 46.
o
Learn more about Group Delay measurements at the FieldFox
Supplemental Online Help:
http://na.tm.agilent.com/fieldfox/help/FieldFox.htm
Unwrap Phase
Same as Phase, but without 180 degree wrapping.
o
Start
Stop
and
frequencies – Specify the beginning and end of the sweep.
o
43
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