# Potentiometer Linearity Tolerance

Greetings.
I am looking for an explanation of the linearity tolerance.

What I think it means is that at any point in the potentiometer’s travel, the deviation from the theoretical linear value could be +/- x% depending on the tolerance.

Like a scatter plot around a linear trendline bounded by the tolerance.

Is this accurate?

Best Regards,
Jim

The linearity tolerance refers to the allowable curve in the linear line from the bottom to the top of your resistance range. The Resistance tolerance would have to do with the overall value of that range.

It’s actually a bit more complicated for most precision potentiometers (better than 2%) because there are four different versions of linear conformity. So you’ll need to refer to the official standard for potentiometer specifications and measurements from the Variable Resistive Components Institute (VRCI). http://www.alliantech.com/pdf/technique/norme_potentiometre.pdf

The official standard is very difficult to read and fully understand but fortunately Bourns produced a handbook to explain it all in much easier to understand language. See the sections on conformity and linearity.

1 Like

Thank you for the replies.
I found the answer in the guide, which does confirm what my thinking was.

I used scatter plot to express individual points instead of the plot for the entire curve.
Attached is graph of independent linearity.

Thanks again.
Jim

Thanks for the info bud!!