System Impedance; Port Extensions - Agilent Technologies N9913A 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 44.
Learn how to make 75Ω measurements at the FieldFox Supplemental Online
Help:
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
52
Man (default setting at -15 dBm) Set output power to an arbitrary value,
o
FLAT across the displayed FieldFox frequency span. If flattened power can
NOT be achieved, a warning message and beep occurs. To achieve a
flattened output power, reduce the power level or stop frequency.
Then press
Power Level
o
Then enter a value using the numeric keypad, the ▲|▼ arrows, or the rotary
o
knob.
Press Enter.
o
http://na.tm.agilent.com/fieldfox/help/FieldFox.htm
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.
Edit
Enter
FieldFox User's Guide