Keysight N9923A, User Manual, Page: 47 / 276

Keysight N9923-90001 User’s Guide
47
NA (Network Analyzer) Mode
NA Mode Settings
—
Smith
Used mainly for S11 and S22, which are plotted on a Smith
Chart. Displays series resistance and reactance.
—
More then…
— Polar Used mainly for S11 and S22. Displays magnitude and phase
of the reflection coefficient.
—
Group Delay Used mainly for S21 and S12. Displays signal
transmission (propagation) time through a device in seconds. The
Group Delay aperture is the current Smoothing aperture. Default is
1.5% of the X-axis.
——Learn how to set Smoothing aperture on
“Smoothing” on
page 51
.
——Learn more about Group Delay measurements at the FieldFox
Supplemental Online Help:
http://na.support.keysight.com/fieldfox/help/SupHelp/FieldF
ox.htm
—
Unwrap Phase
Same as Phase, but without 180 degree wrapping.
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 in
“Interpolation *” on page 119
.
How to set Frequency Range
This can be done in two ways:
— Press
Freq/Dist
— Then choose from the following:
—
Start
and
Stop
frequencies – Specify the beginning and end of the
sweep.
—
Center and Span frequencies - Specify the center frequency and
span of frequencies (half on either side of center).
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. To
ensure that the phase measurement is accurate, increase the resolution
setting. When making a narrow band measurement, reduce the start
frequency for the unwrapped phase measurement to ensure the first data
point is less than 180 degrees from DC.