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MSP430FR6043: Repeatability issue (glitch in signal)

Prodigy 150 points

Replies: 5

Views: 109

Part Number: MSP430FR6043

Hello,

I'm trying to measure mass flow using ECM MSP430FR6043 and 200kHz transducers in a 3D printed tube.

I'm able to measure flow rate for several flow rate setpoint but sometimes I have kind of glitches that always have the same offset (+/- 29kg/h) compared to the set point (please see example below).

Any idea on possible root cause ?

Thanks and regards,

Guillaume

  • Hi Guillaume,

    Can you post the absolute Time of Flight and Delta Time of Flight graphs that correspond to the areas where these glitches are seen?  

    BR,
    Leo

  • In reply to Leonardo Estevez:

    Hi Leo,

    Unfortunately not. These glitches have been seen with SW without GUI and in this SW (based on USSSWLib_V2_30) does not put as an output absolute ToF or dToF (I know that they're accessible inside "algResults" structure but I do not record them...)

    Regards,

    Guillaume

  • In reply to Guigui:

    Hi Guillaume,

    Can the same issue be seen with the GUI and the original version of the code under the same test condition?  Can you confirm what the interval is that you have set for computing the absolute time of flight?  

    BR,
    Leo

  • In reply to Leonardo Estevez:

    Hi Leo,

    Yes sometimes I'm able to see "peaks" when using GUI SW (see screenshot below without any flow inside the tube).

    Regards,

    Guillaume

  • In reply to Guigui:

    Hi Guillaume,

    The best way to debug what is happening is to turn on continuous capture while monitoring the waveforms. Once you see the problem in the GUI occur. You can stop continuous ADC capture and take a look at your ADC captures when the problem occurred. It's possible that there is some infrequent noise in your environment. This should show up in your ADC captures if this is the case.

    BR,
    Leo

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