Endpoint Linearity Error
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How To Calculate Linearity Error In Excel
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Bfsl Accuracy
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From the graph plotted of Voltage Output against Increase in Measurand which usually appears as a curve, a straight line is drawn from the zero point to the full scale output point. Usually the point which deviates most from the simple straight
How To Calculate Linearity In Excel
line will be used to specify the 'linearity' of the transducer. This is quoted as general characteristics of transducer a percentage of the normal full scale output of the transducer Best fit straight line method of definition In practice, the relationship between transducer linearity the measurand and the output of most transducers is not perfectly linear and it is therefore necessary to find a way of using these devices to achieve the most accurate overall results. This can be achieved by https://www.jedec.org/standards-documents/dictionary/terms/linearity-error-end-point-linear-and-adjustable-analog-digital- constructing what is known as the "Best fit straight line" (BFSL) through the calibration points in such a way that the maximum deviation of the curve from the line is minimised as indicated in the figure below. This diagram simply illustrates how, instead of drawing a straight line between the origin and the end point at "B", we can construct a line which effectively halves the maximum deviation that would appear at point "A" and shares http://www.sensorland.com/HowPage026.html it with the end point at "B". Thus the deviation from the BFSL, and hence the linearity error, is effectively halved. However, it should be appreciated that this is simply a means of interpretation of the results and relies entirely on the system, including the measuring equipment, being set up to take advantage of this technique. To take advantage of this method in the case illustrated, it is necessary to set up the system so that when the transducer is at full scale 'y' at point 'B' the indicated output would be set to a value of 'x'. This then effectively halves the error indicated at 'A' which would now deviate from the BFSL by the amount 'c' - 'd' rather than 'c' - 'e' if we had simply constructed an 'end point straight line'. It can be clearly seen that this enables us to effectively halve the errors in the system and thus record better results over the whole measuring range. Note however that although it is quite easy to construct a BFSL on a graph of transducer output against measurand, it is not so easy to do when faced with a simple set of figures. In practice we need a better, quicker and more consistent means of determining the BFSL which can also take into account transducers with bi-polar outputs such as LVDTs
Home Products Load Cells & Force Sensors LVDT, Position & Displacement Sensors & Transducers Pressure Sensors & Level / Depth Sensors Instrumentation for Load Cells, Strain Gauges, LVDTs, http://www.appmeas.co.uk/technical-notes/linearity-or-nonlinearity.html Torque Transducers & Pressure Sensors Torque Transducers & Torque Sensors Sensors for Motorsport Digiforce Services About Us Blog Resources Free Engineering Unit Conversion Program Glossary of Transducer-Related Terms Instrument Calibration & Test Procedure Videos ATEX, Intrinsic Safety & Hazardous Area Information IP Ratings and Equivalent NEMA Ratings Reference Articles on Sensors and Transducers Engineering Notes on Pressure Measurement Links linearity error to Other Useful Websites Distributors Contact Us Quick Enquiry Form Name: Email Address or Phone No: Your Enquiry: >>You Are Here: Home > Technical Resources > Technical Notes on Pressure Sensing Linearity or nonlinearity? Linearity error is the deviation of the sensor output curve from a specified straight line over a desired pressure range. The linearity error value is normally how to calculate specified as a percentage of the specified pressure range. If a sensor is only used over half the specified range and you are able to set the maximum value to be used then the linearity error is calculated from this value, which of course is going to provide improved accuracy over that specified by the manufacturer. There are two common ways of specifying the linearity error: BFSL BFSL stands for best fit straight line. The error is specified as the maximum deviation +/-x% of span of output value from the straight line. TBL TBL stands for terminal base linearity or end-point linearity. TBL is determined by drawing a straight line (L1) between the end data points on the output curve. The data point is chosen to achieve the maximum length of the perpendicular line. As the shape of the output curve is repeatable, it is possible to linearise the output using external electronics, such as compensation circuits or a microprocessor. Normally the linearity error is the least significant of all the errors in any given pressure sensor:
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