I'm using the EVM430FR6043 for a gas meter configuration and i have a noise problem. I use 200 kHz transducer (AT200 from AIRMAR) spaced of 8 cm. After following the user guide and also flash the binaries to the evaluation board I always have a noise issue.
Here is my pin configuration for the board, one of the noisy ADC capture (noise in red) and noisy spikes ATOF and DTOF at 0 flow :
I tried multiples configurations, more and less amplification, differents distances, gap measurements, reflashing the board, redownlaoding the GUI and even all that on a second EVM430FR6043 board and on a second PC. I always have the issue. Then i noticed that when there is no wire, the noise is about +-20 amplitude counts on ADC capture but when i plug one wire on X1 or X2 on J5 or J6 but not connected to a tranducer, I already have the noise. Here is a screenshot of this situation :
(if i connect one DNS wire i have the noise also on this channel)
My guess is the noise come from the USB cable but at such a high level I don't understand why and I don't know what to do ?
Do you have any suggestions ? (I can't test now your suggestions because I'm on vacation until the end of June but I will read and answer on the forum)