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ADS131M08MET-EVM: Software integration - gives random values

Madhura Gogate
Prodigy 100 points

Part Number: ADS131M08MET-EVM

Hello team,

I am currently giving 0.1V to 0.9V at J8 terminal with SW integration set to 1.

The result obtained on GUI does not give a clear idea of the mapping of voltage to current. The current keeps on changing the value and does not settle to one value.

Also, the fundamental current value is not shown. It gives only zero reading.

image.png

Can you please help also share the meaning of green and red colour code?

Thank you in advance!

 

  • 0
    TI__Mastermind 27210 points

    Hi Madhura,

    1. Are you using Rogowski coils for your current sensor? (I'm assuming yes because you mention setting the SW integration to 1)
    2. Are you providing input to any other terminal or only J8? 

    J4, J8, J11, and J14 are specifically for current inputs.

    The red, green, and yellow values signify stability if the values are red then the signal has not settled properly. The fundamental values are based on the fundamental frequency and would filter out the harmonic components.

    It doesn't look like you've calibrated with your hardware interface as a lot of the values are all over the place. With only a single input you're probably picking up noise on the floating nodes. Having only a single input terminal provided is causing some of the instability.

    If using the Rogowski coils, remove the burden resistor jumpers JP1-JP8.

  • 0 in reply to Luke Ledbetter
    Prodigy 100 points

    Hi, Thank you for the inputs. Will check based on your feedback above.

    We are only checking  ADS board current input channels without Rogowsky coil.

    The observation is that without Rogowsky coil, if SW integration is not set to 1, the results settle to particular value with voltage input given to J4, J8, J11 and J14. If rogowsky  coil is not connected, does the board inherently perform SW integration?

  • 0 in reply to Madhura Gogate
    TI__Mastermind 27210 points

    Hi Madhura,

    The board is using jumpers and the switches to handle the configuration, the code isn't made to automatically detect what the user has as a front end for the current sensor. The SW integration adds extra filtering for the rogowski coil requirements (due to the nature of a di/di sensor), if you aren't using the rogowksi coil then you don't need to enable the SW integration.

    Regards,
    Luke

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