loading effect the ratings of piezoelectric sensor indicate that a certain stimu

Question

loading effect the ratings of piezoelectric sensor indicate that a certain stimulus the sensor provides an output of 150 V at no load. the short-circuit current sensor is measured and found to be 10 Micro amper. to measure the output voltage of the sensor . voltmeter with an internal impedance of 10 mega omh is connected across the sensor
1- calculate the actual reading of the voltmeter and error in reading the stimulus due to impedance of the voltmeter.
2-what is the impedance of the voltmeter to reduce the error in reading below 1%?

Explanation / Answer

Answer 1)

Formula : V= I R

               V= 10 x 10^-6 x 10 x 10^6 =100 volts

Answer 2)

Formula: R = V/ I = 100/ 10x10^-6 =10 x 10^6 ohms

          1% error= R x 1/100= 10^5 ohms

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