Circuit to improve the loading-induced nonlinearity in a potentiometer

Circuit to improve the loading-induced nonlinearity in a potentiometer

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On: 21 Jun, 2017

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A simple way to reduce the loading error, without requiring a measuring device with higher input resi...

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A simple way to reduce the loading error, without requiring a measuring device with higher input resistance, is to place a resistor equal to Rm on the top side of the potentiometer, as shown in Figure 3.7 [21. The measured voltage is then
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Thus the effect of the added resistor is to force Vm = V/2 at the central position (x = 0.5), setting the error at that point equal to zero. The general equation for the absolute error is now

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