Surface Concept SC-TDC-1100 Series, Manual

8

For release version 212

•  Use the BNC sockets named “Stop“ to apply 1 - 8 LVTTL signals to the TDC stop input channels.
•  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” to apply LVTTL signals (see

 Chapter 4.2.2 

for detailed 

information).

•  Use the USB cable to connect the TDC to the PC. Do not use PC front panel USB connectors; they are 

often restricted in performance (see

 Chapter 3.3

 for further details).

•  Please note that all inputs are internally 50Ohm terminated and are laid out for 50Ohm terminated 

LVTTL (low voltage TTL) signal levels.

•  Install the TDC device driver or software package prior to switching on the TDC. 

For release versions 312 & 322

•  Use the LEMO 00 sockets named “Stop“ to apply 1 - 2 (R312) and 1 - 4 (R322) NIM signals to the TDC 

stop input channels.

•  To perform time measurements with respect to an external clock, provide start pulses to the start input 

of the TDC. Use the LEMO 00 socket named “Start” to apply NIM signals (see

 Chapter 4.2.2 

for detailed 

information).

•  Use the USB cable to connect the TDC to the PC. Do not use PC front panel USB connectors; they are 

often restricted in performance (see

 Chapter 3.3

 for further details).

•  Use BNC cables to connect your additional signals to the additional inputs of the TDC (e.g. SYNC IN).
•  Please note that all additional inputs are internally 50Ohm terminated and are laid out for 50Ohm 

terminated LVTTL (low voltage TTL) signal levels.

•  Install the TDC device driver or software package prior to switching on the TDC. 

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.

SC-TDC-1100 Series Manual | Surface Concept GmbH