There are TWO types of impedance measurements of importance with EEG. The primary one is the SKIN IMPEDANCE, which reflects the quality of the connection between the electrode / paste / gel / and skin. The GUI can show you that figure in the impedance widget. Lower is better.
The other type of impedance is called the amplifier INPUT IMPEDANCE and depends on the chip(s) used in the front end of the EEG sensor / amplifier. In the case of Cyton, it is using the TI ADS1299 chip. Which has an input impedance of 1 giga-ohm. This is very good, because with this measure, higher is better. You can see another discussion of this at this link:
Comments
There are TWO types of impedance measurements of importance with EEG. The primary one is the SKIN IMPEDANCE, which reflects the quality of the connection between the electrode / paste / gel / and skin. The GUI can show you that figure in the impedance widget. Lower is better.
The other type of impedance is called the amplifier INPUT IMPEDANCE and depends on the chip(s) used in the front end of the EEG sensor / amplifier. In the case of Cyton, it is using the TI ADS1299 chip. Which has an input impedance of 1 giga-ohm. This is very good, because with this measure, higher is better. You can see another discussion of this at this link:
https://openbci.com/forum/index.php?p=/discussion/comment/13328/#Comment_13328
The technical specs for the ADS1299 are here:
https://www.ti.com/product/ADS1299
William