http://blog.prosig.com Telling you what you really need to know about noise & vibration measurement Thu, 09 Sep 2010 09:46:15 +0000 en hourly 1 http://wordpress.org/?v=3.0.1 http://blog.prosig.com/2008/06/04/shaft-displacement-measurement-using-a-protor-system/ http://blog.prosig.com/2008/06/04/shaft-displacement-measurement-using-a-protor-system/#comments Wed, 04 Jun 2008 10:49:36 +0000 Don Davies http://blog.prosig.com/?p=65 Shaft displacement is an important vibration measurement for rotating machines. Shaft displacement is usually monitored by non-contact shaft displacement probes such as eddy-current probes. These probes produce a voltage proportional to the distance of the shaft surface relative to the tip of the probe. For maximum benefit, ideally two shaft displacement probes will be fitted to [...]]]> http://blog.prosig.com/2008/06/04/shaft-displacement-measurement-using-a-protor-system/feed/ 5 http://blog.prosig.com/2005/08/09/phase-between-signals/ http://blog.prosig.com/2005/08/09/phase-between-signals/#comments Tue, 09 Aug 2005 17:08:39 +0000 Dr Colin Mercer http://blog.prosig.com/2005/08/09/phase-between-signals/ The following article was written in response to a question from a visitor to the website. The gentleman in question had been reading some of the Prosig signal [...]]]> http://blog.prosig.com/2005/08/09/phase-between-signals/feed/ 4 http://blog.prosig.com/2002/02/03/frequency-hertz-orders/ http://blog.prosig.com/2002/02/03/frequency-hertz-orders/#comments Sun, 03 Feb 2002 17:09:46 +0000 Dr Colin Mercer http://blog.prosig.com/2002/02/03/frequency-hertz-orders/ The most common form of digitising data is to use a regular time based method. That is data is sampled at a constant rate specified as a number of samples/second. The Nyquist frequency, fN, is defined such that fN = SampleRate/2. As discussed elsewhere Shannons Sampling [...]]]> http://blog.prosig.com/2002/02/03/frequency-hertz-orders/feed/ 0