Velocity Factor - Agilent Technologies FieldFox N9923A User Manual

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).
Increase Dynamic Range
Dynamic range is the difference between maximum input power to the FieldFox
receiver (without compressing the receiver), and the minimum measurable
power (noise floor). Measurement accuracy is increased when the DUT response
is at least 10 dB above the noise floor. For a measurement to be valid, input
signals must be within these boundaries.
A common application that requires a wide dynamic range is measuring the
rejection band of a base station filter.
NA (Network Analyzer) Mode
Velocity factor = 1/sqrt(εr)
Port Extensions
Velocity Factor
Enter.
Calibration
).
r
Calibration
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