Keysight N9938-90003 User’s Guide 83
NA (Network Analyzer) Mode
NA Mode Settings
— 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 75.
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).
While setting Port Extension, the physical length of the extension, at the
current Velocity Factor setting, is visible to the right (red box in above
image).
Velocity Factor
The electrical delay or port extension value is entered as delay, or electrical
length, in units of time.
Entering the velocity factor causes the FieldFox to accurately display the
equivalent physical length in meters (NOT available in feet) that corresponds
to the entered electrical delay.
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