Question

2.5 Loading effects. The ratings of a piezoelectric sensor indicate that at a certain stimulus the sensor provides an output of 150 V at no load. The short-circuit current of the sensor is measured and found to be 10 micro(A) (this is done by shorting the output through a current meter). To measure the output voltage of the sensor, a voltmeter with an internal impedance of 10 Mega(ohm) is connected across the sensor.
a. Calculate the actual reading of the voltmeter and the error in reading the stimulus due to the impedance of the voltmeter.

CORRECT ANSWER: 60 V, 60% error

b. What must be the impedance of the voltmeter to reduce the error in reading below 1%?

CORRECT ANSWER: 1485 Mega(ohm)

Please show steps necessary to arrive at correct answer, thank you.

Answer 1

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