01-14-2014 06:37 PM
I'm using a pcie 6361 with a scb-68 breakout board to measure two signals simultaneously. My problem is that I am seeing a small trace of signal A in signal B and vice versa.
A simpler explanation of the same problem: if I connect a signal to any of the analog inputs, I can see that signal on every other analog input (very small of course, but present). Is there any way to eliminate that unwanted ghost signal?
Thanks,
Elliot
01-15-2014 01:11 AM
you have discovered crosstalk due to the multiplexing ADC sample&hold capacitor settling time.
See spec of your card.
Minimize it by
reduce the samplerate and
reduce the source impedance
01-15-2014 09:09 AM
Hello,
Based on your description, you might find the following KnowledgeBase articles helpful:
"KB 49F73C4G: What is the Difference Between Crosstalk and Ghosting?"
"KB 28MF7JQO: Troubleshooting Unexpected Voltages, Floating, or Crosstalk on Analog Input Channels"
Hopefully these resources can help you work through your issue!
01-15-2014 07:40 PM
Thanks for both of your responses! I've got some work to do.