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Determine the full scale range for the input voltage if the resistance in series with meters are 1kΩ, 2kΩ, 47kΩ and full scale meter movement is 1mA in low voltage AC voltmeter?

Determine the full scale range for the input voltage if the resistance in series with meters are 1kΩ, 2kΩ, 47kΩ and full scale meter movement is 1mA in low voltage AC voltmeter? Correct Answer 1.1 to 7.48 Vrms

The minimum and maximum values of resistors are 1kΩ and 6.8kΩ.So, the range for the input voltages are Vin(rms)|min = 1.1×R1/Io = (1.1×1kΩ)/1mA =1.1v. Vin(rms)|max =1.1×R1/ Io =(1.1×6.8kΩ)/1mA = 7.48v. Thus, the full scale input voltage ranges from 1.1 to 7.48 Vrms.

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