Keysight N9923-90001 User’s Guide47NA (Network Analyzer) ModeNA Mode Settings—Smith Used mainly for S11 and S22, which are plotted on a SmithChart. Displays series resistance and reactance.— More then…—Polar Used mainly for S11 and S22. Displays magnitude and phaseof the reflection coefficient.— Group Delay Used mainly for S21 and S12. Displays signaltransmission (propagation) time through a device in seconds. TheGroup Delay aperture is the current Smoothing aperture. Default is1.5% of the X-axis.——Learn how to set Smoothing aperture on “Smoothing” onpage 51.——Learn more about Group Delay measurements at the FieldFoxSupplemental Online Help:http://na.support.keysight.com/fieldfox/help/SupHelp/FieldFox.htm—Unwrap Phase Same as Phase, but without 180 degree wrapping.Frequency RangeSet the range of frequencies over which you would like to make measurements.When the frequency range is changed after a calibration is performed, the calbecomes interpolated. Learn more in “Interpolation *” on page 119.How to set Frequency RangeThis can be done in two ways:— Press Freq/Dist— Then choose from the following:— Start and Stop frequencies – Specify the beginning and end of thesweep.— Center and Span frequencies - Specify the center frequency andspan of frequencies (half on either side of center).Phase is unwrapped by comparing the phase from one data point to thenext. If the phase difference between two data points is greater than 180degrees, or if the phase of the first data point is greater than 180 degreesfrom DC, than the phase measurement is probably NOT accurate. Toensure that the phase measurement is accurate, increase the resolutionsetting. When making a narrow band measurement, reduce the startfrequency for the unwrapped phase measurement to ensure the first datapoint is less than 180 degrees from DC.
