<div dir="ltr">Dear Archana,<div><br></div><div>EEG signal range is 1-500Hz. Not even kiloHertz. Because of this, any shield room is fine (i.e. does not work anyway).</div><div><br></div><div>The most problematic environmental artifact is 50/60Hz line noise. This is hard to shield because of low frequency. I heard that you need a type of magnetic shield instead of ordinary copper ones to shut it off.</div><div><br></div><div>I&#39;ve seen labs that is not shielded. Their data tend to have higher 50/60Hz line noise, but we can low-pass the data below that. Our Mobilab does not have a shield either.</div><div><br></div><div><span style="font-family:arial,sans-serif;font-size:13.142857551574707px">&gt; I would like to know what does the cutoff in Hz represent.</span><br></div><div><span style="font-family:arial,sans-serif;font-size:13.142857551574707px"><br></span></div><div><span style="font-family:arial,sans-serif;font-size:13.142857551574707px">The noise level is guaranteed to be attenuated to the specified levels.</span></div><div><br></div><div>Makoto</div><div><br></div><div><br></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Oct 15, 2014 at 10:20 PM, Archana Singh <span dir="ltr">&lt;<a href="mailto:sine.arc@gmail.com" target="_blank">sine.arc@gmail.com</a>&gt;</span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div dir="ltr"><div style="outline:none"><div style="margin-bottom:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;width:621.1111450195313px;float:none!important"><div style="padding-top:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;border-bottom-color:rgb(216,216,216);border-top-color:rgb(216,216,216);border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;margin-bottom:0px;margin-left:0px;margin-right:0px"><div style="padding-bottom:20px;padding-left:8px"><div style="font-family:arial,sans-serif;font-size:medium;margin-left:44px"><div style="font-size:13.333333969116211px;margin-bottom:0px;margin-left:0px;padding-bottom:5px"><div style="overflow:hidden"><div dir="ltr"><div><br></div></div></div></div></div><div style="font-family:arial,sans-serif;font-size:medium;margin-left:44px"><div style="font-size:13.333333969116211px;margin-bottom:0px;margin-left:0px;padding-bottom:5px"><div style="overflow:hidden"><div dir="ltr"><div>Dear All,</div><div><br></div></div></div></div></div><div style="margin-left:44px"><div style="margin-bottom:0px;margin-left:0px;padding-bottom:5px"><div style="font-family:arial,sans-serif;font-size:13.333333969116211px;overflow:hidden">I  hope that some of you have experience with construction of electric shielding room for your EEG experiments. I am negotiating with shieldroom companies for our new EEG lab.</div><div style="font-family:arial,sans-serif;font-size:13.333333969116211px;overflow:hidden">I would like to know how to interpret the shielding cutoff specifications. </div><div style="font-family:arial,sans-serif;font-size:13.333333969116211px;overflow:hidden">I have received various shielding specifications as follows. I know 40dB would be sufficient for our purpose, but I would like to know what does the cutoff in Hz represent. </div><div style="font-family:arial,sans-serif;font-size:13.333333969116211px;overflow:hidden"><br></div></div></div><div style="margin-left:44px"><div style="margin-bottom:0px;margin-left:0px;padding-bottom:5px"><div style="font-family:arial,sans-serif;font-size:13.333333969116211px;overflow:hidden"><span style="font-family:&#39;Times New Roman&#39;,serif;font-size:11pt">100K-30MHz / 40dB</span><br></div></div></div><div style="margin-left:44px"><div style="margin-bottom:0px;margin-left:0px;padding-bottom:5px"><div style="overflow:hidden"><span lang="EN-US" style="font-size:11pt;font-family:&#39;Times New Roman&#39;,serif"><span lang="EN-US" style="font-size:11pt;font-family:&#39;Times New Roman&#39;,serif">10-30MHz  / 80dB</span><br></span></div></div></div><div style="font-family:arial,sans-serif;font-size:medium;margin-left:44px"><div style="font-size:13.333333969116211px;margin-bottom:0px;margin-left:0px;padding-bottom:5px"><div style="overflow:hidden"><div dir="ltr"><div><span lang="EN-US" style="font-size:11pt;font-family:&#39;Times New Roman&#39;,serif">500k-500MHz / 40dB</span><br></div><div><br></div></div></div></div></div><div style="font-family:arial,sans-serif;font-size:medium;margin-left:44px"><div style="font-size:13.333333969116211px;margin-bottom:0px;margin-left:0px;padding-bottom:5px"><div style="overflow:hidden">Best,</div><div style="overflow:hidden">Archana</div></div></div><div style="font-family:arial,sans-serif;font-size:medium;margin-left:44px"><div style="font-size:13.333333969116211px;margin-bottom:0px;margin-left:0px;padding-bottom:5px"><div style="overflow:hidden"><br></div><div style="overflow:hidden"><br></div><div style="overflow:hidden"><br></div></div></div><div style="font-family:arial,sans-serif;font-size:medium;margin-left:44px"><div style="font-size:13.333333969116211px;margin-bottom:0px;margin-left:0px;padding-bottom:5px"><div style="overflow:hidden"><div dir="ltr"><div><br></div><div>__________________________________________</div><span class=""><font color="#888888"><div><div style="font-size:13px"><div>Archana Singh, </div><div>ERATO Researcher,</div><div>Functional and Chemosensory brain imaging group</div><div>Department of Applied Biological Chemistry</div><div>Graduate School of Agricultural and Life Sciences</div><div>The University of Tokyo, Tokyo 113-8657</div><div><br></div></div></div></font></span></div><div></div></div></div><div></div></div><div style="font-family:arial,sans-serif;font-size:medium"></div></div><div style="font-family:arial,sans-serif;font-size:13.333333969116211px;border-bottom-left-radius:0px;border-bottom-right-radius:0px;border-top-style:none;background-image:initial"><div><div style="margin-right:5px;padding-left:0px"></div></div></div></div></div></div><div style="font-family:arial,sans-serif;font-size:medium;outline:none"><div style="margin-bottom:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;width:621.1111450195313px;float:none!important"><div style="padding-top:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;border-bottom-color:rgb(216,216,216);border-top-color:rgb(216,216,216);border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;margin-bottom:0px;margin-left:0px;margin-right:0px"><div><div style="padding-bottom:20px;padding-left:8px"><div><div></div></div></div><div style="padding-bottom:20px;padding-left:8px"><br></div><div style="padding-bottom:20px;padding-left:8px"><br></div></div></div></div></div></div>
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