SNA5000A Vector Network Analyzer User Manual 122
5. If there are too many windows or too much information in a window to observe the
information or traces, it will be useful to maximize the window or trace.
5.2 Open/Close/Preset TDR Option
To switch on the TDR option, use the order
Math
->
TDR
->
TDR
, then the button "On" will
be selected. The TDR toolbar will appear at the bottom of the screen, and the TDR option
function will be open to the user. If you have the trial license for the TDR option, an information
dialog will appear to notify you that the trial times will decrease. If the trial times expire, a
permanent license is needed to switch on the TDR option.
To close the TDR option, use the order
Math
->
TDR
->
TDR
again, then the button "Off" will
be selected, VNA will restore the state before the option opened. Click the
button at the
top right corner of the TDR toolbar will close the TDR option, too.
Click the
Preset
button in the
Basic
bar of the
Setup
tab in the TDR toolbar and the VNA
will preset the TDR option: Clear the calibration data, allocate the traces and windows
automatically, and reset the settings in the option. After the TDR option is started, the
calibration wizard will need to be run again.
5.3 TDR Setup Wizard
The TDR setup wizard pops up when the TDR option is switched on for the first time. Click
the checkbox "
Show this wizard next start-up
" to decide whether the wizard pops up when
opening the option or not. The wizard can be opened by clicking the
Setup Wizard
button in
the
Basic
bar of the
Setup
tab in the TDR toolbar.
The wizard will guide you to finish the DUT topology selection, port extension setup, DUT
length measurement, and stimulus rise time setting. The calibration type can be selected in the
Error Correct
bar on the first page of the wizard, and the wizard will also guide you to finish
the calibration you select. The calibration operation will be illustrated in detail in the section
"
TDR calibration
".
If you don't need to finish the setup in the wizard immediately, you can close the wizard.
But the calibration is necessary before accurate measurement or analysis.
5.4 Calibration for TDR Option
There are two calibration types in the TDR option:
Deskew
or
Deskew & Loss
Compensation
. The former only moves the reference plane to the end of the cables
connected to the ports of VNA, ignoring the signal loss in the cables. And the latter tries to
compensate the loss in the cables.
5.4.1
Deskew
Click the
Deskew
button in the
Basic
bar of the
Setup
tab in the TDR toolbar to open
the
Deskew
dialog. Connect all cables and fixtures to the VNA, and connect the other ends
Summary of Contents for SNA5000A Series
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