108 Keysight N9915-90020 User’s Guide
NA (Network Analyzer) Mode
NA Mode Settings
b. Then enter a value using the numeric keypad, the
arrows, or the rotary knob.
c. Press
Enter
.
System Impedance (Z0)
To accurately view data presented in Smith Chart format, first set the System
Impedance.
Learn how to select Smith Chart format in “Format” on page 98.
Learn how to make 75Ω measurements at the FieldFox Supplemental Online
Help:
https://rfmw.em.keysight.com/wireless/helpfiles/FieldFoxOnlineSupplement
alHelp/Home.htm
.
How to set System Impedance
1. Press Meas Setup 4
> Settings.
2. Then scroll to System Z0 and press Edit
3. Then type either 50 or 75 and press
Enter
Port Extensions
Port extensions allow you to electrically move the calibration reference plane
on either port 1 or port 2 after you have performed a calibration.
Why use Port Extensions
Use port extensions if you are unable to perform a calibration directly at your
device because the location is not accessible. Perform a calibration at a
convenient place, then use port extensions to compensate for the time delay
(phase shift) to the desired reference plane. On the FieldFox, port extensions
does not compensate for the loss of the additional electrical length, nor any
mismatch errors beyond the calibration reference plane.
Also, use port extensions if you have already performed a calibration, and then
decide that you need to add a length of transmission line in the measurement
configuration. Use port extensions to “tell” the FieldFox that you have added
the length to a specific port.
— With S11 and S22 reflection measurements, the FieldFox doubles the port
extension valued that you enter to account for the additional delay in the
forward and reverse directions.
— With S21 and S12 transmission measurements, the port 1 and port 2
extensions are added together. This accounts for the total transmission
delay going through ports 1 and 2.
Port extensions and Electrical Delay differ in the following ways:
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