SNIP------------------------------------------------------------------> > Using an oscilloscope, when I probed the power supplies with the spindle > running, I got about .5 Volts of ripple that had a three stair step up > and down appearance. Probing the +5 Volt differential signals I got a > very short 10 Volt spike on the rising edge of each pulse, but otherwise > they looked well formed. Without the differential boards, the +5 Volt > encoder pulses had a more drawn out spike on the rising edge and the > tops varied about a Volt above +5. > > The whole idea of the differential boards where to reduce the > susceptibility of the system to noise, but the boards themselves seem to > make the effect of the noise worse. >
Are your differential inputs terminated? If not, that would account for the spike... CAT5 has 100 Ohm charateristic impedance, so you need a 100 Ohm resistor across each A /A, B /B, X /X pair. Peter Wallace ------------------------------------------------------------------------- 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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
