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Original question:

MSP430F67791A: How to perform gain and phase calibration on each phase without using EMDC GUI

MSP430F67791A: Active Energy Calibration without EMDC Software

SAURABH PATEL
Prodigy 140 points
Part Number: MSP430F67791A


Hello  James Evans,

Thanks for providing EMDC Calibration Process ,we have calibrated through it.

Now there is one problem we are facing that active energy readings are not accurate.

its showing error of 4Wh(total 496WH)  at total of 500Wh.

We have calibrated energy error from EMDC GUI software in which there is a energy error correction factor provided but it is not displayed how to calibrate active energy in PDF sent by you.

Please provide equations and method for how to calibrate active energy error.

Thanks,

 SAURABH PATEL

2021-05-19 EMDC Calibration Process (3).pdf

  • 0
    TI__Mastermind 49692 points

    Hello,

    SAURABH PATEL said:
    Thanks for providing EMDC Calibration Process ,we have calibrated through it.

    That's great news.

    SAURABH PATEL said:
    We have calibrated energy error from EMDC GUI software in which there is a energy error correction factor provided but it is not displayed how to calibrate active energy in PDF sent by you.

    Let me make sure I understand what you're saying. It sounds like you were able to use the EMDC GUI to calibrate the active energy and the error went away and you would like to understand how to do that without using the GUI. Is that correct?

    The calibration option 3 in the EMDC GUI allows you to use pulses from an accurate test setup to more accurately calibrate active energy. In general and by default, active energy gets calibrated with the same factor as active power. However, there's a time element difference between power and energy which causes this minute error. For most applications that don't require high active energy accuracy, this error can be ignored. Does that make sense?

  • 0 in reply to James Evans
    Prodigy 140 points

    Yes you got it right we managed to solve energy error by GUI software but we want code /equation behind it.

  • 0 in reply to SAURABH PATEL
    TI__Mastermind 49692 points

    Thanks for confirming. It's not too difficult assuming you have accurate test equipment. I've classified this as Advanced mode, and there are small changes that need to be made in the gain and phase calibration steps compared to Basic mode.

    For gain calibration, the error from your test equipment (normally entered into the GUI in Step 3) is used to scale the existing power scaling factors. For phase calibration, the error from your test equipment is used rather than the calculated error.

    Here's an updated document that includes equations for both Basic and Advanced calibration modes.

    2021-06-23 EMDC Calibration Process.pdf

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