BioSemi.nl

Hello everybody,
we are using the 64 channel active headcap with pin-type electrodes. Now our FCz electrode seems to be defect. Everytime we click it in either the CM is out of range or the offset of FCz is at maximum amplitude.
Does anyone know if we can go on measuring without FCz? Should we keep it completely out of the cap or should we leave it clicked in to secure the correct data registration of all other electrodes?
Thanks for your help!

The described symptoms indicate a defect FCz electrode. When the defect FCz electrode contacts the subject, the safety circuits are triggered and power to all electrodes is shut down (indicated by a flickering blue light).

You can measure with the set, so long as the defect electrode does not contact the subject (tape the defect electrode to the flat cable). All other electrodes will then function correctly (with blue light continuously on). It is possible to use a TP-pin electrode (connected to one of the EX inputs) as a temporary replacement FCz electrode.

Please sent the defect set to BioSemi for replacement of the FCz electrode (after repair, set is "as new" again).

Best regards, Coen (BioSemi)