Part Number: TDC1000-TDC7200EVM
Hi,
I am attempting to use the TDC1000-TDC7200 EVM in a flow metering application, but not in a pipe. Rather, it is to be used in an open tank environment and later in the ocean. To achieve this, I have used these pre-potted sensors: https://www.steminc.com/PZT/en/food-grade-ultrasonic-flow-sensor-1mhz. I have press fitted these into a delrin frame that my coworker created like so:
They are flush with the edge of each "mast" and each sensor is run through a small coaxial cable to suppress EMI. The basic functionality of the board is present, however, I'm noticing a disparity between the upstream and downstream TOF causing a delta TOF of around 4 ns at zero flow. Here is a sample CSV file run in flow mode:
As you can see, there is a near-constant delay between the upstream and downstream TOF measurements. Next, I will attach screenshots of my GUI tabs, and what I read on my THS3024 Oscilloscope:
There is also a bit of strange ringing right before and during the START pulse for me, which I can't explain.
Please let me know if you have any ideas for how I can solve this problem. I suspect it may have to do with the mounting method, but I'm not sure. Perhaps I'm overlooking some specific setting.
Thanks,
Jordan