Port Extensions - Agilent Technologies FieldFox N9913A User Manual

How to set System Impedance
 Press Meas Setup 4.
 Then Settings.
 Then scroll to System Z0 and press
 Then type either 50 or 75 and press

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
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 44.
How to apply Port Extensions
 Press Meas Setup 4.
 Then
 Then
 Then
 Then enter time value using the numeric keypad, the ▲|▼ arrows, or the
50
extension valued that you enter to account for the additional delay in the
forward and reverse directions.
extensions are added together. This accounts for the total transmission delay
going through ports 1 and 2.
Port Extensions
Port Extensions ON
Port1 Extension
Enter
rotary knob. Press
Edit
Enter
or select a seconds (time) multiplier.
FieldFox User's Guide