Newsgroups: comp.robotics
Path: brunix!uunet!think.com!yale.edu!qt.cs.utexas.edu!news.Brown.EDU!noc.near.net!wpi.WPI.EDU!rkh
From: rkh@wpi.WPI.EDU (R Kurt Heinzmann)
Subject: Re: Tacho. and Potentiometer Noise
Message-ID: <1992Mar11.161025.2358@wpi.WPI.EDU>
Summary: Noise plus ripple
Keywords: Tachogenerator, Potentiometer, Measurement Noise
Organization: Worcester Polytechnic Institute
References: <1992Mar10.180530.18502@sol.UVic.CA>
Date: Wed, 11 Mar 1992 16:10:25 GMT
Lines: 25

In Article 1961, merlic@jacob.UVic.CA (Mile  Erlic) asks:

>  I am interested in the characterization of the measurement
>noise associated with tachogenerators and potentiometers, i.e.
>noise bandwidth and noise energy. Does anybody reading this
>newsgroup have knowledge of any references on this topic?
>...

Sorry, I don't know of such a text, but most manufacturers of tachometers
specify the maximum ripple, and manufacturers of position sensing
potentiometers state the output smoothness, which looks like noise,
but is really a physical quality.  To understand the ripple and inherent
irregularities of these devices, a good starting point would be
to look at the signals on an oscilloscope.  In most cases, the noise
is insignificant by comparison.

True noise is covered in, for example, Fink & Christiansen, Electronic
Engineer's Handbook, and many other electrical engineering texts.

rkh

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