298 Analog Voltmeter Design Figure P298 (a) shows a voltmeter circuit consisting of a DArsonval meter, two
Question:
2–98 Analog Voltmeter Design Figure P2−98
(a) shows a voltmeter circuit consisting of a D’Arsonval meter, two series resistors, and a twoposition selector switch. A current of IFS = 400 μA produces full-scale deflection of the D’Arsonval meter, whose internal resistance is RM = 25Ω.
(a) Select the series resistance R1 and R2 so that a voltage vx = 100 V produces full-scale deflection when the switch is in position A, and voltage vx = 10 V produces full-scale deflection when the switch is in position B.
(b) What is the voltage across the 20-kΩ resistor in Figure P2−98(b)? What is the voltage when the voltmeter in part
(a) is set to position A and connected across the 20-kΩ resistor? What is the percentage error introduced connecting the voltmeter?
(c) A different D’Arsonval meter is available with an internal resistance of 100 Ω and a full-scale deflection current of 100 μA. If the voltmeter in part
(a) is redesigned using this D’Arsonval meter, would the error found in part
(b) be smaller or larger? Explain.
Transcribed Image Text:
Vx +1 50 V A +1 R B R (a) 30 20 RM ww (b) FIGURE P2-98 VM
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