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Dear Lufti,

The standard practice is to reduce the impedance below 5K. This requires some experience and just the right level of aggressiveness in rubbing the skin to avoid injuring your subject. Usually people learn it from other people who can do it so it is hard to teach someone via e-mail. Of course problems with the cap or the kind of gel you are using cannot be ruled out but the best thing would be to find someone experienced and invite this person to check your system and teach you.

Best,

Vladimir



On 29 Nov 2011, at 11:57, Ameer lutfi shaar <[log in to unmask]> wrote:

Dear All ,
 
i have couple of questions if any one could help me its really important .
 
what is the standard impedance values for EEG cap electrodes , i tried everything i cant get it under 10 K its always yellow , are the Caps bad ? or is it like this always .
what kind of EEG electrodes we can use instead of the cap ?
whats the minimum acceptable impedance value is good for diagnostics

Best Regards
Lutfi N. Shaar
Neuro Service Engineer

Al Amin Medical Instruments Co. Ltd.
Technical Service - Riyadh
Saudi Arabia

Mobile: +966 54 000 9535