Temperature Measurement System Design
We did following problem of cascaded op amp. A cascade connection is a head to tail arrangement of two or more op amp circuits such that the output of one is the input of the next.
Lab: After doing a bunch of math, we found out Vab = -(Vs/4R)*delta(R) .
We measured the resistance of thermistor at room temperature (20 degree ) = 11.8k ohm, and we set that for Rnom. And now we set the potentialmeter to 11.8k ohm and the rest of resistor to 11.8 K ohm as well.
we set the potentialmeter to 11.8k ohm, and get the out range 0.00v~ 0.276V.
Construction of the Wheatstone bridge
Summary: This lab illustrates that Wheatstone bridges can be used to effectively relay minor changes in resistance, and then difference amplifiers can greatly magnify that difference. The lab was a success.
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