Impedance
To measure the impedances of your Mentalab Explore electrodes, navigate to the Impedance Measurement page.
Select which type of electrodes you are using from the drop-down menu. Then, click on ‘Measure Impedances’. Channel impedances will display their value and corresponding color code as in the table below.
| Color | Range (kΩ) | |
|---|---|---|
| Wet electrodes | Dry electrodes | |
| Green | < 10 | < 20 |
| Yellow | 10 – 20 | 20 – 35 |
| Orange | 20 – 30 | 35 – 50 |
| Red | 30 – 50 | 50 – 70 |
| Black | > 50 | > 70 |
| Gray | Inactive channel / Device not connected | |
You can also visualize impedances on an EEG montage. For this, make sure you assign all channels names in the standardized location in settings page from dropdown menu. Then, switch to impedance page and change toggle button on top right to EEG view.
Impedance values depend on the impedance of the reference electrode. The value shown for each electrode is the average of the ground and ExG electrodes’ impedances.
If all channel impedances are high, try cleaning the skin under the reference electrode more thoroughly using, e.g., alcohol, abrasive gel, or EEG.
If all channel impedances are high, try cleaning the skin under the reference electrode more thoroughly using, e.g., alcohol, abrasive gel, or EEG.
Impedance values are subject to environmental conditions like noise and temperature. Aim for regular room temperatures (~15-25°C)
For more information or support, do not hesitate to get in contact at: support@mentalab.com