5. Thermal compensation circuits
Theoretically, thermal effects act in the same way on all four branches of the bridge, and therefore cancel each other out to a first approximation, but when we want to achieve a certain degree of precision (e.g. 0.005% / °C), we need to discuss this theoretical evidence.
Among the causes of thermal pests are :
voltage-generating thermoelectric effects ;
zero drift;
variations in sensitivity.
Let's consider these phenomena in turn.
5.1 Effects of parasitic thermoelectric torques
They occur when the connecting wires are of a different metal to the gauges, and when there are thermal asymmetries between the different parts of the sensor. These effects can be avoided by wiring the connections with appropriate...
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Thermal compensation circuits
Associated instrumentation
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