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/iframe></center><br><br> <br><br> </center> </td></tr> </table> <center> <table> <tr> <td width="600"> <center><hr width="400"><font size="2"><b>The <a href="http://www.cyber-spy.com/">Cyber-Spy.Com</a> Usenet Archive Feeds Directly<br>From The Open And Publicly Available Newsgroup<br>Sci.Electronics.Design<br><br>This Group And Thousands Of Others Are Available<br>On Most IS NNTP News Servers On Port 119.<br><br><a href="http://www.cyber-spy.com/">Cyber-Spy.Com</a> Is NOT Responsible For Any Topic,<br>Opinions Or Content Posted To This Or Any Other<br>Newsgroup. This Web Archive Of The Newsgroup And<br>Posts Are For Informational Purposes Only.<br><br></b></font><hr width="400"></center> <center><font size="2"><pre><b> Reply-To: "Mike" <mike@nospam.com> From: "Mike" <mike@nospam.com> Newsgroups: sci.electronics.design References: <acb22b57.0212172038.673988f1@posting.google.com> <elTL9.5500$jM5.15844@newsfeeds.bigpond.com> <qsa00v4s1u3s5pdo2d994e13gu8d5nhc7d@4ax.com> <q7WL9.5601$jM5.16134@newsfeeds.bigpond.com> <4dc00voebmhialfsonrfvoqhog4qnu9hdo@4ax.com> Subject: Re: Audio noise in diff amps X-Newsreader: Microsoft Outlook Express 5.50.4920.2300 Message-ID: <mk3M9.395$vb3.74434@news2.west.cox.net> Date: Wed, 18 Dec 2002 18:42:26 GMT NNTP-Posting-Host: 68.5.97.52 NNTP-Posting-Date: Wed, 18 Dec 2002 13:42:26 EST Organization: Cox Communications "Don Pearce" <donald@pearce.uk.com> wrote in message news:4dc00voebmhialfsonrfvoqhog4qnu9hdo@4ax.com... > Power is v squared / r. > > 2.4 uV in 22k ohms is -126dBm = (10 log((2.4e-6)^2 / 22000 + 30), or > -125.8dBm. But 2.4uV was obtained by taking sqrt(4kTRB). What you've done is calculate 10*log(4kTRB/R) + 30 = 10*log(4kTB) + 30. Your equation is missing a right parenthesis: it should have been written: (10 log((2.4e-6)^2 / 22000) + 30). Assuming B = 16kHz, this is indeed -125.8, but you've removed R from the equation. Given any resistor value, the noise power you calculate will always be the same. While that would simplify the meter design - it would read the same even if the probes weren't connected - I'm not sure it's very useful. I'm quite sure the meter is measuring something different... -- Mike -- </b></pre></font><hr width="650"><a href="http://www.cyber-spy.com/electo-index.html"><font size="3">Go Back To The <a href="http://www.cyber-spy.com/">Cyber-Spy.Com</a><br>Usenet Web Archive Index Of<br>The sci.electronics.design Newsgroup</font></a><br><br></center></td><img src="http://cyber-spy.com/cgi-bin/livecntr.pl?0+1+unetsci" width="1" height="1" alt="The Cyber-Spy Toolkit - powerful internet spy software - live police scanners - usenet fbi secrets archive - newsgroup spy electronics archive - search engine spy tools - download TCST today!"> </tr> </table> </center> <center> <br><center><hr size="3"></center> <table width="100%" cellpadding="0" border="0" cellspacing="0"> <tr> <td align="left" valign="top"><small><b><i><a href="http://www.cyber-spy.com/index.html">Cyber-Spy.Com Live Resources</a></i></b></small></td> <td align="right" valign="top"><small> Copyright Alpha Omega Delta,<br> All rights reserved. </small></td> </tr> </table> <center><hr size="3"></center> <br><br> <br><br></center> </body></html>