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It switches to "offset", where the input is shorted and the ADC should read zero.
But because of offset it measures any other value. Let's name it "Z".
Now with every "true" measurement it simply subtracts the offset.
1. Is it measures the opamp offset voltage?
2. Resistor 100E is 0.01% tolerance FOIL type used. What is the purpose of it. Why excitation current is to be measured?
1) it measures the system offset voltage: multiplexer, OPAMP, ADC
2) Where do you have the information "FOIL"? Are you hiding additional infromations? (I don´t see the necessity for "foil")
Why: Because the sensor output is ratiometric. It depends on excitation current. And it shows if the sensor is connected at all.
Please read basics about "strain gauge sensors" in four wire connection.
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