AC V-meter in the figure is designed to measure the RMS value of the input sinusoidal voltage u(t). The diodes are assumed to be ideal; M is a moving-coil type measuring unit with Ri=2k (internal resistance) and im=100A (current for full-scale deflection). a) Draw the current through M in scale and calculate R1 for a nominal voltage of 100V.

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The AC V-meter in the figure is designed to measure the RMS value
of the input sinusoidal voltage u(t). The diodes are assumed to be
ideal; M is a moving-coil type measuring unit with Ri=2k (internal
resistance) and im=100A (current for full-scale deflection).
a) Draw the current through M in scale and calculate R1 for a
nominal voltage of 100V.
b) The class of the measuring unit is given as 0.5. Calculate the
maximum acceptable tolerance for the resistors (all of the
same tolerance), if the V-m is required to be of the class 1.5 max.

1) The AC V-meter in the figure is designed to measure the RMS value
R1
of the input sinusoidal voltage u(t). The diodes are assumed to be
ideal; M is a moving-coil type measuring unit with R=2k (internal
ult)
R2
R3
resistance) and im=100HA (current for full-scale deflection).
a) Draw the current through M in scale and calculate R1 for a
nominal voltage of 100V.
b) The class of the measuring unit is given as 0.5. Calculate the
maximum acceptable tolerance for the resistors (all of the
18k
20k
R4
k: k2
10k
same tolerance), if the V-m is required to be of the class 1.5 max.
ఇ కే
Transcribed Image Text:1) The AC V-meter in the figure is designed to measure the RMS value R1 of the input sinusoidal voltage u(t). The diodes are assumed to be ideal; M is a moving-coil type measuring unit with R=2k (internal ult) R2 R3 resistance) and im=100HA (current for full-scale deflection). a) Draw the current through M in scale and calculate R1 for a nominal voltage of 100V. b) The class of the measuring unit is given as 0.5. Calculate the maximum acceptable tolerance for the resistors (all of the 18k 20k R4 k: k2 10k same tolerance), if the V-m is required to be of the class 1.5 max. ఇ కే
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