## Circuit to improve the loading-induced nonlinearity in a potentiometer

Updated by: Keira

On: 21 Jun, 2017

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Category: Sensors

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

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

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

Equation (3.13) shows the dependence of the maximal relative error on *k. *Because in (3.10) x and 1 — x can be interchanged with no effect, we conclude that the relative error is symm...

Figure 3.4 is variation of the measured voltage of a potentiometer as a function of wiper position, for different values for *k. *This means that the input resistance of the voltage measurin...

Figure 3.3a shows the simplest signal conditioning for a potentiometer having a nominal resistance *R. *The linear or rotary movement from the device to be mea...

To obtain this expression, we did not use any mathematical model for *RT. *Thus this method can also be applied to PTC thermistors and other nonlinear resistive sensors.

Anoth...

In most applications NTC thermistors must be analyzed in the complete circuit where they are used. But in some cases they can be used as linearized sensors by shunting them with a resistor R. In th...

The circuit in Figure 2. 17a is suitable for measuring a temperature over a limited range, for example, that of cooling water in cars. It consists of a...

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