Pat Lyons wrote: > Hey folks, > > just inquiring about the output of my anilam linear encoder being less than > one volt in amplitude... a full 5v is applied, but the pulses coming out > only hit like 0.3v I pulled apart the connector to find some oil in > between the pins but wiped it out and still have the same problem. > > I'd like to ask, when/if encoders begin to die or deteriorate, do they > behave like this Is this encoder connected to the equipment it normally feeds, or are you checking it with just a power supply and scope? If the latter, you may need to apply a pull-up resistor to +5 V on the signal lines. Or, this may be a current output encoder, possibly just a bare photodiode. Or, it may be a scale designed for 12 V power.
If it is a bare photodiode, and the rising edge has a fairly sharp transition, then it has an internal pullup, but needs a comparator to detect the 1/0 difference. This is not too uncommon in the older scales. On the other hand, 0.3 V could be the photovoltaic output of a bare photodiode. If you put a 10 K resistor from +5 to the output, does the signal amplitude improve markedly? Do you still have whatever this encoder was connected to? If so, you can look at that and see what the encoder signals were connected to. Jon ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
