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TDC1000-C2000EVM: TDC1000-C2000EVM ' problem

Part Number: TDC1000-C2000EVM
Other Parts Discussed in Thread: TDC1000

TDC1000-C2000EVM is used for various problems in flow measurement:
The setup of the experimental device:
The resonant frequency of the piezoelectric ultrasonic transducer dedicated to water flow measurement is about 350Khz, and the temperature sensor is not used, and the user GUI settings are shown in the figure:


The problems with zero flow measurement are:
1) There is a large deviation in the 0 flow measurement, the measurement result should be around 0ns, but the test result is about tens of microseconds, and the error is particularly large.
2) After testing with an oscilloscope, I found that the START signal, STOP signal, and COMPIN signal are not the expected shape, which caused great interference to my measurement.
I very much hope to provide accurate register settings, hardware configuration and oscilloscope display settings for flow measurement using TDC1000-C2000EVM and 350Khz ultrasonic transducers.
Attach the display of START signal, STOP signal and COMPIN signal on the oscilloscope