Chris Radek wrote: > On Sun, Jun 03, 2007 at 05:11:06PM -0500, Jon Elson wrote: > > >>This is the classic aliasing error. The scope is sampling less >>frequently than the step pulse generating code. I'm not sure >>how fast you can get halscope to sample, I suppose it depends on >>the CPU speed. > > > Nope, it depends on which thread you pick. I suspect Jack is sampling > on the servo thread, but he should be using the base thread since > the parallel port can send out many pulses/steps during one servo > cycle. Yes, for sure, to see the step pulses, he needs to be at the base thread rate. I've never done that, as I use halscope mostly for servo tuning and want a long time record. I guess the data recording thread doesn't use much resources, so it shouldn't be a problem to run it at the base thread rate.
Jon ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
