Non-linearity BFSL issue of pressure transmitters
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In the documentation for pressure transmitters, I saw that the term \"nonlinear\" is followed by the abbreviation BFSL; when I searched for BFSL on Baidu, it meant nonlinear as well. Does BFSL simply mean nonlinear? Are there any other meanings? Thank you so much.
The last edit to this post was made by 1111111 on 2018-1-8 at 13:47. “BFSL” is a method for evaluating nonlinear errors; it’s called the best-fit line method. So what exactly is a “best-fit line”? It’s about finding the line that minimizes the apparent error value; objectively speaking, it’s possible to determine the best fitting line for the sensor. But even after a lot of effort, it might not be possible to truly identify which line is the best one. In practical applications, people simply draw a line arbitrarily and use it as a reference for assessing nonlinear errors. This line is probably just a way for sensor manufacturers to cover up their shortcomings – its purpose is to make it seem as though the nonlinear error is smaller. Additionally, even if the actual nonlinear error of the sensor exceeds the acceptable limits, sensor users often lack the mathematical skills needed to provide evidence for making claims or demands. So, I guess no one in the world uses this crappy line these days; not even the sensor manufacturers themselves would use it. Separator----------------- Moreover, the nonlinear error values determined using the zero and full-scale endpoint method tend to be the highest, roughly 3 to 4 times higher than those obtained using the best fitting line method. The nonlinear error values calculated using the method that takes into account the zero point are more practical, being approximately twice those from the best fitting line method. Separator----------------- Lastly, for pressure transmitters and various other instruments, attention is usually focused only on accuracy, with no consideration given to nonlinear errors. . . That is, the nonlinear errors of the instrument are already included in the accuracy class. Moreover, during the calibration process of the instrument, nonlinear errors are neither recorded nor evaluated. Hehe, there are some awkward terms related to instruments, like “BFSL” – I just ignore them; it’s sufficient to understand things simply. Otherwise, it’s a waste of time with no real value. . .