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SNA5000A Vector Network Analyzer User Manual 124
5.5 TDR Channel Setup
When the TDR function is activated, the current state is saved, and all existing traces
and channels are deleted, and a new channel is added for the option. When the option is
closed, all traces and the channel being used are deleted, and the instrument is returned to
the state before TDR was opened.
The current channel settings can be changed in the TDR toolbar at the bottom of the
screen, usually in the Setup tab.
5.5.1 DUT Topology
In addition to the Setup wizard, the DUT topology can be changed in the DUT topology
pull-down menu in the Basic bar of the Setup tab. The traces and windows are allocated
automatically according to the DUT topology.
If the DUT topology is changed, the calibration and deskew data will be cleared.
Recalibration becomes necessary before an accurate measurement or analysis. If the
calibration data is hoped to be held, save the state in time and recall it when required.
5.5.2 DUT Length
The DUT length means the time that the signal takes to transmit through the DUT or
reflect the incident plane and is required to show the time-domain responses of DUT in full.
The sweep frequency span and points of the channel are set according to the DUT length,
and the span of the transformation is automatically calculated by the DUT length when the
time domain traces are set in the time axes. It's not recommended to change the sweep
settings by other methods.
In addition to the Setup wizard, the DUT length can be set in the DUT Length textbox in
the Basic bar of the Setup tab. It's a convenient way to set the suitable value by measuring
the DUT length in the DUT Length dialog. Click the Auto button on the left of the textbox to
open the dialog, connect the DUT according to the picture and instructions in the dialog, click
the Measure button and wait for the mark to appear, click the Finish button to close the
dialog, and finish the DUT length setting. If the measurement result is out of the default
range, an information dialog will pop up to notify the users that the DUT length will be set to
the maximum or minimum.
5.5.3 Stimulus Magnitude in Time Domain
The stimulus magnitude in the time domain can be set in the Stim. Ampl. textbox in the
Basic bar of the Setup tab, which defines the magnitude of the impulse or step stimulus
signal for the time-domain responses of the traces under the format Volt.
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