Velocity Factor - Keysight N9923A FieldFox User Manual

How to apply Port Extensions
 Press Meas Setup 4.
 Then
 Then
 Then
 Then enter time value using the numeric keypad, the ▲|▼ arrows, or the rotary
You can also set Port Extensions by pressing Meas Setup 4 then
(settings).
While setting Port Extension, the physical length of the extension (in meters ONLY),
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.
Velocity factor is the ratio of the velocity of wave propagation in a coaxial cable to
the velocity of wave propagation in free space. This velocity depends on the relative
permittivity of the cable dielectric (
VF = 0.66 corresponds to wave propagation through a polyethylene dielectric.
VF = 1.0 (default setting) corresponds to wave propagation through free space (a
vacuum).
How to set Velocity Factor
 Press Meas Setup 4.
 Then
 Then
 Then enter a value between 0.1 and 1 using the numeric keypad, then press
You can also set Velocity Factor by pressing Meas Setup 4 then
(settings).
Big Marker Display States (A and B)
This feature, available ONLY in NA Mode, allows you to view up to three Big or Super
Big marker readouts. This is done by using up to two different display states called A
and B. Each display state is comprised of the settings listed below. When the Big
Readout setting is toggled through A and B, these display states are recalled.
NA (Network Analyzer) Mode
Port Extensions
Port Extensions ON
or
Port1 Extension
knob. Press or select a seconds (time) multiplier.
Enter
Velocity factor = 1/sqrt(εr)
Port Extensions
Velocity Factor
Enter.
Port2 Extension
).
r
Calibration
Calibration
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