Channel Cross Talk

[Dana Martin]

I am using USB-2633 and USB-2637 mcc measurement cards.  The last channels on the cards seem to have the most additional noise from what I believe to be channel  cross talk. 

Is there a way to minimize this cross talk via ground selection and/or software methods or will this noise always be present? 

Do all MCC boards have this problem or are some models better than other?

[Fausto]

Hello @Dana Martin.

Are you using all 64 single-ended analog inputs on both the USB-2633 and USB-2637 devices?

For single-ended wiring, all inputs share the same ground.  

What is your throughput rate?

What are the input voltage ranges of your signals?

Try to keep adjacent input voltage levels similar to each other versus large voltage swings (-10V on one channel compared to +10V on the other channel).

https://www.mccdaq.com/pdfs/manuals/USB-2633.pdf

https://www.mccdaq.com/pdfs/manuals/USB-2637.pdf

Regards,

Fausto

[Dana Martin]

@Fausto,

I am using all 64 single-ended analog inputs.

Throughput is approximately 15,000 samples per second.

Voltage ranges are +-10 volts on all channels.

[Fausto]

If possible, rearrange your input wiring to avoid large voltage fluctuations between channels.  Your throughput rate is not at the board's max rate, but rearranging the wires may help.