12. RF-Multiplexer (optional Hardware)
Sequid time-domain reflectometers can be operated with an external
unit to expand the number of channels that can be acquired
in parallel (see Fig.
). The control of the multiplexer is fully integrated
in the Seunis software, including the opportunity to perform a TTC/12TC
calibration for all channels separately. Please note that the multiplexer must
be connected to the computer while starting the software.
Figure 18: TDR equipped with external DP4T-Multiplexer
12.1 Assigning Channels to Samples
If a multiplexer unit is detected by the software, an additional
Mux
column
is added to the
Sample List
(see Fig.
), indicating the multiplexer channels
of the samples. Furthermore the currently selected multiplexer channel is
displayed in the status bar of the
Main Window
and in the upper-left corner
of the oscilloscope display.
The multiplexer channel can be selected in the
RF Multiplexer Dialog
, shown
in Fig.
. The dialog can be opened via the
Main Window
menu entry
Extras
→
RF Multiplexer
or by using the shortcut CTRL-M. The number of available
channels is detected automatically.
1
DTDR-800 is also available with an internal DPDT multiplexer
81