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#1 schwerdtlem

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Posted 06 June 2012 - 05:41 PM

Hello, we are using the counter of the U12 to read an SEW encoder. The frequency is 0-1.7khz. Low is 0V high is 4V. In our application we measure lengths and we noticed that when we run at high speed the lengths are longer. Could this be due to the labjack missing some of the pulses? The signal looks clean, though. As per spec it should be able to read up to 1 MHz, but is this related to the hardware connected to the labjack at all? Thanks.

#2 LabJack Support

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Posted 07 June 2012 - 12:39 PM

Do you read the counter at some interval, and determine length based on the number of counts? What interval do you read the counter at, and how many counts do you typically get at that interval? Sounds like you are saying that at high speed, you get more counts than expected? That should be easy to confirm with LJcounter.exe. Set the "Measurement Type" to Count and clear the "Reset Counter" control. Note the initial count, then turn your encoder a fixed distance, and look at the final count.

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