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PCIe 7852R and SCB-68 connectivity

1) NI SCHC68-68-EPM compatable with this R series board to connect digital lines (connector 1 and 2) to SCB-68A? The recommended NI SHC-68-68-RDIO is only 1m and would be of great inconvenience.

 

2) I want to ultimately connect the PCIe 7852R card analog+digital inputs and outputs to BNC (50 Ohm) breakout box. Does the SCB-68A terminal block provide any advantages over using unterminated cable such as SCH-68-NT-S directly?

 

3) How would I go about impedance matching the I/O from the FPGA to the BNCs?

 

Thanks!

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Hi pobedil,

 

1. The NI SCH-68-68-RDIO is the only supported cable for connectors 1 and 2 of the PCIe-7852R.  The cable was specifically designed for the high performance and bandwidth of the R Series cards, and the length of the cable is specific for the impedance matching.

 

2. The main benefit of using a terminal block such as the SCB-68A is its ready-to-use access to each of the cable's pins via screw terminals.  If you wanted to create your own harness for the pins, the unterminated cable would be fine, but it requires you to make your own custom wiring scheme.

 

3. Some basics on impedance matching can be found in the link below:

 

http://www.ni.com/white-paper/3475/en#toc3

Andrew T.
National Instruments
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