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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

## Relative and absolute error for the circuit as a function of wiper position and the factor K

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...

## Signal conditioning for resistive sensors

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...

## Simple signal conditioning for a potentiometer

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...

## Thermistor linearization using two resistors. Two parameters of the equivalent resistance can be chosen.

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...

## Thermistor linearization using a fixed shunt resistor

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...

## Some applications of NTC thermistors for the measurement and control of temperature and other quantities

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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