Measurement and Instrumentation
Which of following is not correct?

 Voltmeter should have very high resistance.
 A shunt should have a very low resistance.
  An electronic voltmeter draw appreciable current from the source.
 An ammeter should have a very low resitance.

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Measurement and Instrumentation
A DC potentiometer is the best means available for the measurement of DC voltage because

 None of above.
  It is based on null balance technique.
 The precision in measurment is independent of the type of the defector used.
 It is possible to standardize before a measurement is undertaken.

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