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Measuring chest leads ADS1298

Anna Stratmann
Prodigy 40 points

Other Parts Discussed in Thread: ADS1298

Dear E2E-community, dear Brian,
there's another question that arises during my research. I hope you can help me with that, too.

Apart from seperating C1+2 computationally from my readings, I also need to measure C1+C2 alone, i.e. just these two electodes without the reference-electrodes RLNF. I take it that it is possible to change the Right Leg Drive in the setting so it treats e.g. C2 as RLD, which would create a mesaurement between C1 and C2 (I think)? I tried to change the setting in the Right Leg Drive Derivation Control Setting within the software (switching the different Electrodes on and off) but I cannot get the ADS1298 to measure these two electrodes only.

Is that the wrong setting or do I need to change some Jumpers as well? I would appreciate any help you can give!

Best, Anna
  • 0
    TI__Guru 69076 points
    Hi Anna,

    Thanks for your post. I work with Brian and can try to help you with your question.

    For starters, can you confirm that you are trying to use our EVM (ADS1298ECG-FE) and the provided GUI software?

    As you may know, the chest leads are measured with respect to WCT, which is an average voltage derived from the three primary electrodes (RA, LA, and LL). To measure a chest lead, you simply need to configure the inputs such that the Cx electrodes is connected to the positive channel input (INxP) and WCT is connected to the negative channel input (INxN).

    I'm not sure I understand how the RLD derivation relates to your measurement of C1 and C2. What exactly is your concern with the RLD?

    Best Regards,
  • 0 in reply to Ryan Andrews
    Prodigy 40 points

    Hi Ryan, thanks a lot for your effort!

    Yes, I am using the ADS1298ECG-FE with the provided GUI software. Sorry, I should have been more precise with that information.

    I thought I could use the RLD derivation for my measurement but now I realise that your solution is what I am looking for. So forget about the RLD question ;-)

    Just to avoid (my) confusion: To measure C1+2 only (without any other electrodes connected) I should connect C1 to IN1P (positive channel input) and WCT to IN1N (negative channel input)?

    Best regards, Anna

  • 0 in reply to Anna Stratmann
    TI__Guru 69076 points
    Hi Anna,

    No worries on the confusion. :)

    Yes - you can use the jumpers JP26 - JP33 to configure the channel inputs. WCT can be connected to any INxN pin by installing the [1-2] shunt for each jumper. Cx can then be connected to any INxP pin by installing the respective [3-4] shunt.

    Best Regards,