Red Screen

Post Reply
whikgd
Posts: 2
Joined: Fri Nov 09, 2012 3:53 am

Red Screen

Post by whikgd »

All the connecting seems very good, but why there are so many noisy and the screen even becomes red!
Attachments
20140306153156.jpg
20140306153156.jpg (140.44 KiB) Viewed 14043 times

Coen
Site Admin
Posts: 1124
Joined: Fri Mar 26, 2004 7:00 pm
Location: Amsterdam, Netherlands
Contact:

Re: Red Screen

Post by Coen »

Start with making sure that the blue light (CM in range) is continuously ON.

One or more electrodes do not make proper electrical contact with the subject skin, and are flapping rail-to-rail due to interference pickup.

Identify to problem sites in the offset tabpage. Most probably cause is lack of electrode gel in the holder. Add gel and if needed, gently work the gel between the hairs with the plastic tip of the syringe.

Best regards, Coen (BioSemi)

whikgd
Posts: 2
Joined: Fri Nov 09, 2012 3:53 am

Re: Red Screen

Post by whikgd »

The blued light is okay.
Can I test just using several electrodes? I try to test by 3 electrodes and all were connected well but still didn't get better data on screen.
Attachments
20140307110753.jpg
20140307110753.jpg (115.01 KiB) Viewed 14034 times

Coen
Site Admin
Posts: 1124
Joined: Fri Mar 26, 2004 7:00 pm
Location: Amsterdam, Netherlands
Contact:

Re: Red Screen

Post by Coen »

You can test with only a few electrodes. Select only the connected electrodes in the display (use "free choice" option), the loose hanging electrodes will show large interference signals, making the connected electrode invisible. Select the proper Reference to achieve sufficient Common Mode rejection (e.g. average of connected/displayed electrodes).

Best regards, Coen (BioSemi)

Post Reply