The conversion process in the AD is the source of the noise, the impedance (not resistance) of the long wire run seems to be aggravating it. John Ferrell W8CCW "All that is necessary for the triumph of evil is for good men to do nothing." -- Edmund Burke http://DixieNC.US ----- Original Message ----- From: "Michael Rigby-Jones" To: "Microcontroller discussion list - Public." Sent: Wednesday, May 07, 2008 10:52 AM Subject: RE: [PIC]Analog signal conditioning > > >> -----Original Message----- >> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On > Behalf >> Of John Ferrell >> Sent: 07 May 2008 13:30 >> To: Microcontroller discussion list - Public. >> Subject: Re: [PIC]Analog signal conditioning >> >> Yes but that requires access at the tower top. >> Also, I don't think the pot is a significant factor in the problem. >> > > I don't believe it would. You have a resistive sensor on the end of two > long wires, so you can simply use a differential amp at the other end to > remove (or at least attenuate) common mode noise. > > Mike > > ======================================================================= > This e-mail is intended for the person it is addressed to only. The > information contained in it may be confidential and/or protected by > law. If you are not the intended recipient of this message, you must > not make any use of this information, or copy or show it to any > person. Please contact us immediately to tell us that you have > received this e-mail, and return the original to us. Any use, > forwarding, printing or copying of this message is strictly prohibited. > No part of this message can be considered a request for goods or > services. > ======================================================================= > > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist