Color Status
Black No contact is detected
Red Poor Contact Quality
Orange Average Contact Quality
Green Good Contact Quality
If a sensor is not in green, please check that it is making a good contact with the scalp and
the sensor is wet. If the subject has thick hair, try to work the sensor under the hair and add
additional fluid. Bad positioning and dry sensors are the two most common reasons for
poor contact quality. Other reasons could be that the sensor housing isn’t locked in place or
the felt pad has been recently replaced which might not be pushed far enough into the
sensor housing.
If a sensor is persistently not making a good contact, you can test its functionality by
tapping on the sensor and observe if anything appears in the EEG data steam. You can also
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