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Velocity readings cFP-QUAD-510, explain limitations
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RVallieu
Jul 1, 2008, 5:40:14 PM7/1/08
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I am trying to understand the limitations of the Velocity measurements capability of the [c]FP-QUAD-510.
Looking at the operations manual I see the maximum velocities that can be measured in counts/us.
If I have a quadrature encoder tracking a shaft running at 1750 rpm, and the encoder is 60 PPR - this yields 1750 counts/second or 0.00175 counts/us.
Would I thus have to use the longest timebase to obtain RPM +/- 38 counts/sec which with the 60 PPR yeilds +/- 38 rpm ?
Thus I would need to increase my PPR to get me a better Velocity Resolution.**
**Is my understanding of the velocity Ranges correct?Message Edited by RVallieu on 07-01-2008 04:30 PM
Looking at the operations manual I see the maximum velocities that can be measured in counts/us.
If I have a quadrature encoder tracking a shaft running at 1750 rpm, and the encoder is 60 PPR - this yields 1750 counts/second or 0.00175 counts/us.
Would I thus have to use the longest timebase to obtain RPM +/- 38 counts/sec which with the 60 PPR yeilds +/- 38 rpm ?
Thus I would need to increase my PPR to get me a better Velocity Resolution.**
**Is my understanding of the velocity Ranges correct?Message Edited by RVallieu on 07-01-2008 04:30 PM
RVallieu
Aug 8, 2008, 11:10:23 AM8/8/08
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Testing one of the QUAD-510 untis showed me that it is not appropriate for this application. At anything below 38.15 resolution with this 60 ppr encoder, the velocity output oscillates between 0 and 38.15.
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