Keysight N9912A User Manual page 42

 Make these settings in the same manner as Quick Settings in the previous section.
Format
Select the display format in which to present measurement results. This setting can
be changed at any time without affecting calibration accuracy.
Learn more about Display Formats in the FieldFox Supplemental Online Help:
http://na.support.keysight.com/fieldfox/help/FieldFox.htm
The marker onscreen readout can be changed to formats other than the display
format. Learn how to set marker format on page 151.
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. To ensure that the phase measurement is
accurate, increase the resolution setting. When making a narrowband measurement,
reduce the start frequency for the unwrapped phase measurement to ensure the first
data point is less than 180 degrees from DC.
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 page 64.
How to set Frequency Range
This can be done in two ways:
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Format [current setting].
Displays magnitude in dB
Log Magnitude
o
Displays positive values only. Y-axis: Unitless (U) for ratioed
Linear
o
measurements; Watts (W) for unratioed measurements.
(S11 and Fault Location Only) Displays unitless reflection data.
VSWR
o
(S11 Only) Displays phase in degrees. The trace 'wraps' every 360
Phase
o
degrees, from +180 to –180, for easy scaling.
(S11 Only) Displays series resistance and reactance.
Smith
o
then
More
o
(S11 Only) Displays magnitude and phase of the reflection coefficient.
Polar
o
(S11 Only). Displays propagation time (in seconds) from the RF
Group Delay
o
port to the point where it is reflected, and back to the A receiver. The aperture
setting is the frequency range/(number of points – 1). Use Smoothing as the
Group Delay aperture. Learn how to set Smoothing on page 45. Learn more
about Group Delay in the FieldFox Supplemental Online Help:
http://na.support.keysight.com/fieldfox/help/FieldFox.htm
Same as Phase, but without 180 degree wrapping.
Unwrap Phase
o
FieldFox User's Guide