A digital voltmeter has a read-out range from 0 to 9999 counts. When full scale reading is 9.999 V, the resolution of the instrument will be

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UKPSC JE Electrical 2013 Official Paper I (Held on 7 Nov 2015)
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  1. 100 mV
  2. 99 mV
  3. 9 mV
  4. 1 mV

Answer (Detailed Solution Below)

Option 4 : 1 mV
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The correct answer is 'option 4'

Solution:

Resolution is the smallest increment an instrument can detect and display.

In the question, it is given that to measure 9.999V number of counts required is 9999.

By the definition of resolution, the value corresponding to one count gives the resolution.

\(\therefore Resolution= {9.999 \over 9999}\)

\(\implies Resolution = 0.001V\: or \: 1mV\)

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