Discussion
An instrument with four and a half digits is switched to the two volt range. The smallest step it can distinguish there is
Answer: A
Correct answer: 0.1 mV
Four and a half digits give 19999 counts, so on the 2 V range each count is \[ \frac{2\ \mathrm{V}}{20{,}000} = 0.1\ \mathrm{mV}. \] Comparing with the 20 V range shows the general rule: dropping a decade of range gains a decade of resolution, which is exactly why the lowest usable range is chosen.
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