I have noise in the channel 1 only

matejadamatejada Ecuador
edited September 2023 in Ganglion

Hi, I have a little problem, I was taking data with the GANGLION board using the GUI.
I turned off the board to recharge the batteries yesterday and now I have noise on channel 1, I really don't know if it is noise or interference.
No cable or electrode is connected to any channel.

Yesterday it was fine, I don't know what the problem is.
Connecting the electrodes in the ECG configuration seems to solve the problem, but I disconnect them again and the voltage problem on channel 1 returns, .
The visualization is in matlab.

Is it normal or is it a problem with the GANGLION board?


  • wjcroftwjcroft Mount Shasta, CA

    With all EEG / ECG measurement, you need to connect ALL the leads to the pins and your subject: channel, reference and ground, for the readings to have any significance. If the channel pins or wires are left floating, they will pickup environmental EMF (electromagnetic field) noise. Which depends to a large extent on your location and nearby electrical equipment.

  • Ok I understand this, but is it normal that this pickup environmental is only found on channel 1 and not on the rest of channels?

  • wjcroftwjcroft Mount Shasta, CA

    The ONLY valid test of the equipment is with the leads connected as explained. Your second image shows channel 1 giving fine ECG signal.

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