Which method provides better accuracy? Non-linearity as theEnd Point Methodis the relationship of the calibration curve to a specified straight line through its endpoints (i.e. Zero and Full Scale).Best Fit Straight Line (BFSL)method is the relationship of the calibration curve to a calculated straight line that minimizes the error but does not pass through the end points. BFSL method effectively cuts the end point value in half.
For a given non-linearity specification, a product specified with end point non-linearity will provide greater accuracy (i.e. lower uncertainty) than a product specified using BFSL method. The end point specification is more meaningful during re-calibration processes where the end points become Zero and Full Scale (FS) outputs.
End Point Method
终点法测量非线性，当从P0(零压差)到PRS(满量程)画一条直线连接终点时。在这种情况下，当校准调整到零偏移或跨度时，端点精度被保留。
Best Fit Straight Line Method
The BFSL method of calculating non linearity fits a straight line through the actual curve in order to minimizethe relative error between the actual and the straight line. In this case, the end points of the curve have no meaningful relationship to the BFSL. This results in a less accurate method of calculating non-linearity.
Setra'sAccuSense™ Model ASMis a high performance industrial pressure transducer specifies non-linearity as the end-point method.. This is one of many reasons why industry leaders choose the ASM for high-tech applications, laboratories, aerospace applications,vacuum systems,dynamometers, engine test cells, and more.
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