Hello. I bought EEG-SMT, 5 passive electrodes. When I connect all electrodes, channel 1 show noise, but channel 2 doesn't have a signal (screenshot №1). At the screenshot №2 four electrodes connect, whithout DRL electrod.
Did you hold DRL properly in hand in picture 1? Can you swap the electrodes from channel 1 to channel 2 and check the output again - this would determine if it isn't electrode damage?
Picture 2 seems normal - without DRL connected (and the other 4 electrodes connected) this is the normal output. If you remove all electrodes there should be two relatively flat lines (like channel 2 from picture 1).
For normal operation you need to hold DRL in hand and make sure it makes good contact with your skin. Note that the output needs 10 seconds to normalize.
Please send me an e-mail at firstname.lastname@example.org if the problem persists (please include a link to this forum thread, so that you don't have to explain everything again).