Table of Contents
Advertisement
NA (Network Analyzer) Mode
NA Mode 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 (er).
Velocity factor = 1/sqrt(er)
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
Enter.
You can also set Velocity Factor by pressing Meas Setup 4 then
(settings).
S21Transmission Measurements
An S21 Transmission measurement, available with option 110, is used to
measure the loss through a DUT – or cable – over a specified frequency range.
The FieldFox signal source is transmitted out the RF OUT connector, through
the DUT, and into the RF IN connector. Both ends of the DUT must be
connected to the FieldFox.
An S21 measurement is exactly the same measurement as "2-Port Insertion
Loss" in CAT Mode.
A Normalization Cal is REQUIRED when making 2-port CAT or NA
measurement.
For highest accuracy, when measuring the DUT also attach any cable or
adapter that was used in the normalization cal.
Keysight N9912-90001 User's Guide
Port
Extensions.
Velocity
Factor.
Calibration
5- 17
Advertisement
Table of Contents
