Discussion
In a DVM, the accuracy of the measurement depends on
I. No. of A/D conversions in a second.
II. The resolution of A/D converter.
III. A statistical processing of samples and a huge memory.
IV. Speed of the processor should be high.
Answer: B
The key takes statements II, III and IV as the conditions to be fulfilled, option (B). The accuracy of a digital voltmeter depends on the resolution of the A/D converter, statement II, because the smallest step sets the quantisation error. It also depends on statistical processing of the samples with enough memory, statement III, which averages out noise, and on a fast processor, statement IV, so that the processing keeps up. Statement I, the number of conversions in a second, is not counted by the key as a determinant of accuracy, which it treats as a matter of speed. Options (A), (C) and (D) include I. This item follows the key.
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