Velocity Factor - Agilent Technologies N9913A User Manual

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 on page 47.
How to apply Port Extensions
 Press Meas Setup 4.
 Then
 Then
 Then
 Then enter time value using the numeric keypad, the ▲|▼ arrows, or the
You can also set Port Extensions by pressing Meas Setup 4 then
(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.
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
NA (Network Analyzer) Mode
Port Extensions
Port Extensions ON
Port1 Extension
rotary knob. Press
Enter
Velocity factor = 1/sqrt(εr)
Port Extensions
Velocity Factor
Enter.
or select a seconds (time) multiplier.
).
r
Calibration
53