If you notice high impedance reported for one or more electrode during a session, follow the troubleshooting steps below:
  1. Identify which electrodes are reporting high impedance values. If all of the values are showing a high impedance, then there could be artifact or interference present. It is also possible that the connection of the ground electrode needs to be improved.
  2. Squeeze the ground electrode to the scalp/ear and observe if this improves the impedance values. If it does, it may indicate that the connection of the ground electrode needs to be improved.
  3. Check the electrode connection to the client for each electrode reporting high impedance values. If the electrode has a poor connection to the scalp, the signal and impedance can be impacted. Ensure that the site was adequetely prepped, and that enough conductive paste was used.
  4. Look at the electrodes themselvesand check the surface for damages. Scratches, flaking, dried paste, warping, or other imperfections can cause signal issues.
  5. Check the electrode leads and ensure they are not bent or broken.
  6. Ensure that all of the electrodes being used are of the same material and style. Different types of electrodes can conduct signal in different ways, which could cause inconsistencies. 
Knowledge Base Article Tags:

Amplifier

Session

Signal

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