On Friday, February 03, 2012 10:33:35 PM Ed Nisley did opine: > On Thu, 2012-02-02 at 22:21 -0500, gene heskett wrote: > > what can he use for an exciting signal? > > It seems I'm missing something obvious. I thought the idea was to move > the motor back & forth while comparing the commanded (presumably, the > actual) position with the encoder's (also, presumably, the actual) > position to see if there's any lag / jitter / instability between the > two. > > Using freqgen (plus stepgen or whatever the motor might require) to > drive the motor should accomplish the first part. Triggering halscope on > (some part of) the output signal, then displaying both output and input > traces will reveal their relation. > > Then use siggen to ramp / sawtooth freqgen and you'll see how the > relation varies with speed & acceleration. > > Yes?
That, Ed, is essentially what I was asking for. And I had forgotten about freqgen. I used to have a memory... Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://coyoteden.dyndns-free.com:85/gene> If you don't go to other men's funerals they won't go to yours. -- Clarence Day ------------------------------------------------------------------------------ Try before you buy = See our experts in action! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-dev2 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
