On 10 December 2012 04:10, Jon Elson <[email protected]> wrote: > I have a $13K box (Schlumberger dynamic signal analyzer) that is > supposed to acquire the data for Bode plots. I tried to use it on my > home-made analog servo amplifiers. I cut the servo loop and > added a 100 Ohm resistor, and connected the drive/sense > terminals across that. It excited the system with a sine wave, and at > the lowest frequencies, I could see the table rock a small amount. > But, the data I got made no sense at all, and may not have been > repeatable, either.
Is a sine-wave the correct input signal? When I spent my working day creating frequency response curves we typically used white-noise excitation. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto ------------------------------------------------------------------------------ LogMeIn Rescue: Anywhere, Anytime Remote support for IT. Free Trial Remotely access PCs and mobile devices and provide instant support Improve your efficiency, and focus on delivering more value-add services Discover what IT Professionals Know. Rescue delivers http://p.sf.net/sfu/logmein_12329d2d _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
