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What could be the maximum reading on 3 -1/2  digit voltmeter?

  • In a 3-1/2 digit voltmeter, the display has 3 full digits, and the fourth digit can only display "1/2" of the value of the least significant digit.
  • The least significant digit represents the resolution of the instrument, which is the smallest change in the input quantity that can be detected by the meter.
  • Therefore, the highest possible reading on a 3-1/2 digit voltmeter is when all the digits display their maximum value, which is 1, 9, 9, and 9 for the full digits and "1/2" for the half digit.
  • Hence, the maximum reading on a 3-1/2 digit voltmeter is 1999.