Sensors & Data Acquisition — question 5 of 10
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This probes whether the candidate understands what a two-point calibration actually guarantees versus what it doesn't.
You calibrate a thermistor-based temperature sensor at two points: 0C using an ice bath and 100C using boiling water, fitting a straight line between the two raw ADC readings and the known temperatures. Both endpoints check out against your reference thermometer. But when you use the sensor to measure room temperature, around 22C, it reads 1.5C off from the reference. The sensor hasn't drifted and your ice bath and boiling water were good. What's actually going on, and what would you change about the calibration to fix it?