Ammeters, Voltmeters and Ohmmeters


In this chapter you will learn about:

  • Difference between ammeters and voltmeters and how to connect them
  • Accuracy of meters in terms of full-scale deflection
  • Requirement of a shunt to bypass excess current
  • Multi-range ammeters
  • Calculation of the value of shunt for different currents
  • Different methods of connecting shunts in multi-range ammeters
  • Universal shunt and its significance
  • Calculation of the value of universal shunt
  • Ammeter loading and how to minimize its effect
  • Requirement of multiplier to drop excess voltage
  • Multi-range voltmeters
  • Calculation of the value of multipliers for different ranges
  • Different methods of connecting multipliers in multi-range voltmeters
  • Voltmeter loading ...

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