Keysight N9923A, Руководство пользователя, Страница: 56 / 276

56 Keysight N9923-90001 User’s Guide
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
Port Extensions
— Then
Velocity Factor
— 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
Calibration
(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.
How to create Big Marker Display States
To have big readouts, markers MUST be created using the following procedure.
If you have already set up your display and do not want to lose it, then save the
current state to a state file. Learn how in
“State Files” on page 195
. The
following procedure will overwrite your display state.
— Press
Mkr ->/ Tools