What is the meaning of signal RAILED and NEAR RAILED?

VictorFU · November 2017

I have my newly arrived Cyton board here, however, two channels are RAILED and two are NEAR RAILED.

The channels I'm using (from 1 to 8) is Fp1, Fp2, T3, T4, T5, T6, F7 and F8.

I wonder what is the meaning of them and how can I solve it.

Thank you for your replies!!!

wjcroft · November 2017

From:

http://openbci.com/forum/index.php?p=/discussion/575/ch-1-8-ok-ch-9-16-railing

The GUI shows "Railed" when microvolt magnitudes for the channels are off the top end of the scale. In other words, generally it means something wrong with the differential voltage measured between the channel and the reference. Either one could have a poor connection leading to "Railed".

One way to check consistency is to connect all three leads together, SRB2, Bias, and the channel(s) you are trying to measure. You can do this with a glob of Ten20 paste or alligator clips. Once you have all leads connected, that should produce 0 microvolts, or close to it.

Using the search button in right column:

https://www.google.com/search?as_q=railed+meaning&as_sitesearch=openbci.com

VictorFU · November 2017

Thank you

What is the meaning of signal RAILED and NEAR RAILED?

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