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how to calculate gain error, offset and non-linearity

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I'm sorry but I don't understand, I have to calculate: offset error, gain error and non-linearity error of the calibration curve that I got at the output. The errors I mean are described in the attached document, I don't understand why you keep putting in new formulas when I just need to figure out how to calculate these errors.

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Message 11 of 19
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Salve a tutti, avrei bisogno del vostro aiuto. Ho effettuato tramite labview la taratura di un calibratore e, confrontando le misure di temperatura in uscita dal calibratore e da un multimetro ho ottenuto la curva di taratura. 

Ora di questa curva avrei bisogno di conoscere l'errore di guadagno, errore di offset e errore di non linearità. Come posso fare? Vi allego ciò che ho realizzato e ciò che ho ottenuto.

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Message 12 of 19
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You keep attaching pictures that are of no use to us (nobody here will manually enter these numbers into a test VI). Your new code is still missing critical subVIs, e.g. the one for linear fitting, or even the data going into it..

 

Your document is in Italian, but the offset error seems to be the value of the x intercept, which is trivial to calculate once you have a linear fit. Still, the document seems to be discussing digitizing errors given a digital output (y) from an analog input(x). You try to correlate measurement pairs. Not quite the same!


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Message 13 of 19
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I'm sorry but I just don't understand your answers.
Which critical subVIs are you referring to, what input data do you need?

The curve in the images is the calibration one, of this curve I want to know how to calculate offset error, gain and non-linearity; can't you explain to me what I have to do to get them out? What is missing in the VI? If she responds assuming I know what she's talking about, we'll never figure it out.

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Message 14 of 19
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@giu95se wrote:


Which critical subVIs are you referring to, what input data do you need?

 


altenbach_0-1603056213406.png

 

 


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Message 15 of 19
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Message 16 of 19
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We still don't have the data. (the data in the graph only has two rows, while your code implies that it should have 3. Also since you have x and y, shouldn't this be an xy graph???

 

Is the x-array ("calibratore") integers starting at 0 and incrementing by 1 for each point? How are we supposed to know that?

 

Please run your VI until the two input arrays have data, then select them and do a "menu...edit...make selected values default". Save the VI under a new name and attach it here.


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Message 17 of 19
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the calibrator setpoint, represented in array x, increases by 10 degrees celsius each time. The images I showed you previously contain the data obtained by starting the VI.
I will try to replace the graph with an XY and restart the simulation making the values ​​default.

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Message 18 of 19
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I have attached the VI of the fitting, how can I connect an XY graph in here? Can offset, gain and non-linearity errors be quantified from here?

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Message 19 of 19
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