Keysight N9913B, User Manual

Page: 99 / 896

Keysight N9938-90006 User’s Guide 99
NA (Network Analyzer) Mode
NA Mode Settings
— Imaginary Displays only the reactive portion of the measured
complex data. The Y-axis is Unitless.
— Z Magnitude Displays the effective impedance in ohms.
— 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
calibration becomes interpolated. Learn more in “Interpolation *” on page 142 .
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).
— Follow each by entering a value using the numeric keypad, the arrows,
or the rotary knob.
— After using the arrows or the rotary knob, press Enter . The increment
setting of the arrows is based on the current span and can NOT be changed
in NA Mode.
— After using the keypad, select a multiplier key. Learn more in “Multiplier
Abbreviations” on page 46 .
Scale Settings
Adjust the Y-axis scale to see the relevant portions of the data trace. The Y-axis
is divided into 10 graticules.
This setting can be changed at any time without affecting calibration accuracy.
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.