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Power Supply Pin Polarity on USB-6363

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Hi

I am trying to power the USB-6363 with an external power supply but the pin labeling on the back of the DAQ is very confusing. One of the pins is labeled "C" and the other "V". Which one of the two is "Ground"? 

Could not find the information in any document nor by opening the DAQ and looking at the PCB board...

Thanks!

 

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Solution
Accepted by topic author FrankRWC

Just got the information from an NI rep:

"C" = Common = Ground = Negative terminal

"V" = Positive terminal

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