if there is a ground loop somewhere in your setup, it won't conduct any current unless it's ... a loop! so when you disconnect the sensor, it breaks the circuit; no current is induced in the wires by stray magnetic fields, and you dont see any voltage.
if the noise were 'coming from the sensor' then you should see the noise with it hooked up in a different place, such as on a lab bench. if your differential driver has *really* sensitive inputs, i suppose you could be picking up stray electric fields. this could easily be fixed with a pull-up resistor. but this wouldn't explain the noise going away when the encoder sensor is disconnected. On Wed, 17 Oct 2007, Kirk Wallace wrote: > When I was getting index pulses without an encoder disk installed, I > decided to disconnect the index connections to see when the noise > stopped. The noise stopped as soon as I disconnected the encoder sensor. > So either the noise is coming from the sensor, or having the sensor > connected promotes the noise. I am going to have to give this some > thought in order to plan the next move. ------------------------------------------------------------------------- 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
