System Impedance; Port Extensions - Keysight N9923A FieldFox User Manual

System Impedance (Z0)
To accurately view data presented in Smith Chart format, first set the System
Impedance. Learn how to select Smith Chart format on page 26.
Learn how to make 75Ω measurements at the FieldFox Supplemental Online Help:
http://na.support.keysight.com/fieldfox/help/FieldFox.htm
How to set System Impedance
 Press Meas Setup 4.
 Then
 Then scroll to System zo and press Edit.
 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.
NOTE FieldFox analyzers do NOT support port extensions for waveguide component
measurements.
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
 With S21 and S12 transmission measurements, the port 1 and port 2 extensions
Port extensions and Electrical Delay differ in the following ways:
 Electrical delay applies to a specific trace
 Port extensions apply to specific hardware ports
Port Extensions and Electrical Delay can be set independently. When both are set,
the delay adds together. Learn more about Electrical Delay on page 28.
32
Then press
Nominal Power
o
Then enter a value using the numeric keypad, the ▲|▼ arrows, or the rotary
o
knob.
Press Enter.
o
Settings
extension valued that you enter to account for the additional delay in the forward
and reverse directions.
are added together. This accounts for the total transmission delay going through
ports 1 and 2.
FieldFox User's Guide