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Time-to-Digital Converter Octa Channel TDC Manual
For all release versions
• First, use the „Ground” connector (M4 screw) to ground the device.
• Use the DLD readout cable/s to connect the “Lines Out” sockets on the front of the ACU with the “TDC
Input” sockets at the rear panel of the Octa Channel TDC.
• To perform time measurements with respect to an external clock, provide start pulses to the start input
of the TDC. Use the BNC socket named “START IN” to apply LVTTL (low voltage TTL) signals (see
for detailed information).
• Connect the power cable to the main connector.
• Install the TDC device driver or software package prior to switching on the TDC.
For release versions R442
• Use the USB cable to connect the Octa Channel TDC to the PC.
• Use BNC cables to connect your additional signals to the additional inputs of the TDC (e.g. TAG IN).
• Please note that all additional inputs are internally 50Ohm terminated and are laid out for 50Ohm
terminated LVTTL signal levels.
For release versions R443, R451, R461
• Use the Ethernet cable to connect the Octa Channel TDC to the PC.
• Use BNC cables to connect your additional signals to the additional inputs of the TDC (e.g. TAG IN).
• Please note that all additional inputs are internally 50Ohm terminated and are laid out for 50Ohm
terminated LVTTL signal levels.
Finish the complete cabling before the TDC is turned on and the GUI software is started.
Also, close the software and turn off the TDC before performing any changes to the
cabling.
This applies especially to the connection and disconnection of the start input of the TDC.
The start input of the TDC cannot handle pulses which are arriving in a time interval of
smaller than 120ns, as they are produced by e.g. connecting to and disconnecting from
the start input respectively.
If two subsequent pulses are applied to the start input of the TDC, the device will still
deliver results, but these results will contain wrong timing information.
Time-to-Digital-Converter Octa Channel TDC Manual | Surface Concept GmbH
