Discussion
A pair's offset drifts \( 5 \ \mathrm{\mu V} \) per degree over \( 40 \ \mathrm{^\circ C} \). The total drift is
Answer: A
Multiplying the coefficient by the temperature span:
\[ 5 \times 40 = 200 \ \mathrm{\mu V} \]
giving 200 microvolts, which in a stage of gain a thousand becomes two hundred millivolts at the output. Since a trim cancels the offset only at the temperature it was set, this drift is what actually limits a precision measurement across a working day.
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