On Sat, 2007-10-20 at 09:56 -0700, Peter C. Wallace wrote: > On Sat, 20 Oct 2007, Kirk Wallace wrote: ... snip > > drain. I don't know its impedance, but I suppose I could start with 200 > > Ohms and work my way up. The data-sheet indicates that anything lower > > that 90 Ohms should not be used. I'll give it a try today. > > If you start at 200 Ohms, you need to work your way down...
That is what I meant -- start at 200 and go towards 90. Thanks for clarifying it though. > Shielded twisted pair is usually less than 100 Ohms impedance.. > > Termination need not be perfect, the overshoot is very roughly 1/2 of the > impedance mis-match (20% mismatch = 10% overshoot) > > Open ended cables (no termination) will have 100% overshoot (likely the > cause of your 10V spike) > > > Peter Wallace -- Kirk Wallace (California, USA http://www.wallacecompany.com/machine_shop/ Hardinge HNC lathe Bridgeport mill conversion pending Zubal lathe conversion pending) ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
