A bench multimeter on its range resolves

PHYSICS · Multi-part · Fermi University Physics · Scientific Practice & Experimental Methods · Quantities, units and the practice of measurement · Uncertainty in measurement

Measurement and Method, Ch The instrument: resolution, sensitivity, calibration and traceability

Problem

A bench multimeter on its

20.00\,\mathrm{V}

range resolves

0.01\,\mathrm{V}

, so one "digit"

= 0.01\,\mathrm{V}

. Its specification is

\pm(0.8\%\ \mathrm{of\ reading} + 3\ \mathrm{digits})

. Find the uncertainty interval, in volts and as a percentage of the reading, for each of the following readings taken on this range: ((a))

18.65\,\mathrm{V}

((b))

5.20\,\mathrm{V}

((c))

0.45\,\mathrm{V}

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