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TDC1000-TDC7200EVM: Deal with momentary fluctuations

Prudhvi Sagar
Genius 3785 points

Part Number: TDC1000-TDC7200EVM

Hello,

I have attached a flow measurement data which was exported from GUI. DelTOF has some peaks at some places which is effecting the overall water velocity measured. According to the equation V = (DelTOF*c^2)/(2L), velocity should change only at the instances where there is a peak. If I ignore these peaks then what would remain is a smoother data. Is my approach correct to get a better flow measurement? Can I directly vary some parameters of TDC1000(AUTOZERO_PERIOD, TOF_TIMEOUT_CTRL, TIMING_REG, etc) to change the window and ignore these peaks?

Regards,

Prudhvi Sagar  

  • 0
    TI__Mastermind 31655 points

    Those spikes are most likely caused by one of the transducers not receiving the signal, or the amplitude being too small to qualify for a STOP signal. You can adjust the PGA gain (up) and/or the echo quality threshold (absolute value down) to ensure the signal generates a STOP every time.

  • 0 in reply to Scott Cummins
    Genius 3785 points
    Hello sir,
    Thank you for the support. When I implement this in code, if I ignore these values (as they are very few) I can improve the final output? But in the received velocity data how is it getting effected? Is this due to the averaging which is selected in GUI?

    Regards,
    Prudhvi Sagar