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A potentiometric or servo balancing digital voltmeter is characterised by

  • A.a comparator that tests each bit of the output word in turn
  • B.a motor-driven potentiometer brought to balance against the input
  • C.a counter that increments until a digital to analogue converter matches the input
  • D.an integrator whose output is compared with a fixed reference level

Answer: B

The mechanical arrangement makes it slow and it has been displaced by electronic methods, but the principle is a genuine null measurement against a standard, so its accuracy could be very high. The shaft position drives the display through a digital encoder.

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