Impedance question - noisy EEG signal
I'm measuring impedances using the Cyton Signal widget in the GUI.
However, when no pin is connected I am getting non-sensical impedance values around 3 kOhms.
I read that they are supposed to be as high as 5000 kOhms in open circuit (https://openbci.com/forum/index.php?p=/discussion/3726/electrode-impedance-test-using-the-gui-widget).
As for the hardware, I am using a third party pre-built solution containing a cyton, a daisy, a wifi shield and a battery board.
Can anybody help explain this behaviour? My main problem is that I can't get anything more than noise with both passive and active EEG electrodes. So I'm in the process of outruling internal problems with the hardware.
my noisy EEG signal using passive (channel 1) and active (channel 6 and 7) electrodes: