Damian Posted July 8, 2012 Report Share Posted July 8, 2012 We are looking at using the LC3 to measure a pair of load cells at speeds where I am concerned about the response time of the Unitronics system. We got bit a while back by not paying enough attention to conversion times of certain modules and found out that some were quite long. Anyhow, I want to make certain I understand clearly the response I can expect when measuring 2 load cells with the LC3. The published spec is 12.5msec. So the first question is is that total or is it per channel? Will it actually do 12.5msec for both channels independantly, 12.5msec per each channel is use (total 25msec), or worst of all 12.5msec per each channel whether they are used or not (32.5 msec)? I also found this disturbing spec in the help file. Note ♦ Minimum settling times for projects using multiple loadcells are 12.5ms for one active loadcell 675ms for two active loadcells 1,012.5ms for three active loadcells What does this mean exactly? Is this settling on the electronics end? The processing/filtering/program end? How can it go from 12.5ms to 675ms?!? What is the settling time indicating and how is it related to the conversion time? How does this correlate to using multiple LC3 modules. Does the above minimum settling times apply on a per module basis, or does it continue to get exponentially worse for every channel I use? Could I use two LC1 modules instead, and get 12.5ms each to elimate the severe degradation in performance. On a different but unrelated note, we had a customer considering these for their high speed check weighing machines. It seems as though the IO-LC1 and IO-LC3 are not suitable for high speed check weighing applications based on how slow and unresponsive the electronics are. Quote Link to comment Share on other sites More sharing options...
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