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The value of a rotatory potentiometer is 1K. It is connected to a 5.1V power supply. The output values from centre of potetntiometer with respect to the angle are given below:

70° - 1 V
145° - 2.04 V
180° - 2.72 V
245° - 4.01 V
305° - 5.10 V (full)

If I measure the voltage between 0° and 180° , the values increase in a linear manner (0.01511V/deg.). But after 180°, the values does not follow the pattern. If it's linear, the value would be 4.00 V at 265°, but it reaches it at 245°. Similarly, for 5 V.(May be it would be at 330°. But it's not)enter image description here enter image description here So, on seeing this difference, what type of Potentiometer is this to take into account? Can I take it as logarithmic pot?

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  • \$\begingroup\$ Comments have been moved to chat; please do not continue the discussion here. Before posting a comment below this one, please review the purposes of comments. Comments that do not request clarification or suggest improvements usually belong as an answer, on Electrical Engineering Meta, or in Electrical Engineering Chat. Comments continuing discussion may be removed. \$\endgroup\$ Commented Apr 5 at 18:10
  • \$\begingroup\$ non linearity is at the middle of your graph. It look to be about ~0.5V for a 5V full scale. That's 10%. This isn't huge, especially for a regular consumer-grade application. Linearity is typically unspecified in datasheets, because it is not critical most of the time. Since a human will typically move the potentiometer, any nonlinearity will be compensated by the person, who will adjust for to its needs (whatever the potentiometer may control). \$\endgroup\$ Commented Apr 7 at 13:45

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No, that is a linear pot. The code on the pot says "B 1k". "B" means linear. "A" would mean log scale. Besides, your graph data says linear but some non-linear behavior because the pot is old, cheap, abused, etc.

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