Encoder does not read correctly

[Jeffsg605]

I am trying to read a rotary encoder with DasyLab and the e1608 and I am not getting consistent results.  I have a gear on the encoder meshed with an ACME rod that rotates at about 10 RPM. I am trying to read in 2 minute intervals but the pulses I read each time deviate by about 3-5%.  When I read it with a PLC, the counts are very consistent but not DasyLab.  Any ideas on what I can do to get more accurate encoder readings on the counter input?

Thanks,

Jeff

[CJ_Butler__DASYLab_Pro]

Jeff,

Please contact Measurement Computing directly to address this. 

they are more equipped to handle how the E-1608 counter inputs work than anyone else on this forum.

You can contact them via the web site:

http://www.mccdaq.com/support/support_form.aspx

Or call them. 

http://www.mccdaq.com/support/support_form.aspx

[Jeffsg605]

Thank you for the suggestion.  This is the response I got from the manufacturer in case it will help anyone in the future.

"Unfortunately you are seeing the limitation of the counter of the E-1608.  It has no gate and is time controlled by DASYLab’s timer which is subject to the operating system’s hierarchy of priorities.  Meaning, other parts of the Windows operating system will periodically be given a higher priority than DASYLab, and so there is an occasional lag in the counter read.  This is true of DASYLab or any program attempting to read that counter."

So it looks like I'll need to go with a PLC.