Keysight N9923A, Руководство пользователя, Страница: 55 / 276

Keysight N9923-90001 User’s Guide
55
NA (Network Analyzer) Mode
NA Mode Settings
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:
— 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 in
“Electrical
Delay” on page 49
.
How to apply Port Extensions
— Press
Meas Setup 4
.
— Then
Port Extensions
— Then
Port Extensions ON
— Then
Port1 Extension
— Then enter time value using the numeric keypad, the arrows, or the
rotary knob. Press
Enter
or select a seconds (time) multiplier.
You can also set Port Extensions by pressing
Meas Setup 4
then
Calibration
(settings).