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Example 7.2 A bridge circuit, as shown in Figure 7.5. is used to measure the value of the unknown resistance R of a strain gauge of nominal value 5002. The output voltage measured across points DB in the bridge is measured by a voltmeter, Calculate the measurement sensitivity in volts/ohm change in R, if (a) the resistance Rm of the measuring instrument is neglected, and (b) account is taken of the value of Rm-

Example 7.2 A bridge circuit, as shown in Figure 7.5. is used to measure the value of the unknown resistance R of a strain gauge of nominal value 5002. The output voltage measured across points DB in the bridge is measured by a voltmeter, Calculate the measurement sensitivity in volts/ohm change in R, if (a) the resistance Rm of the measuring instrument is neglected, and (b) account is taken of the value of Rm-

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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Example 7.2 A bridge circuit, as shown in Figure 7.5. is used to measure the value of the unknown resistance Ru of a strain gauge of nominal value 500 2, The output voltage measured across points DB in the bridge is measured by a voltmeter. Calculate the measurement sensitivity in volts/ohm change in R, if (a) the resistance Rm of the measuring instrument is neglected, and (b) account is taken of the value of Rm- Solution For R, = 500 2, Vm = 0. To determine sensitivity, calculate Vm for R, = 501 2. (a) Applying equation (7.3): Vm = Vị (R,+R,- R+R2 R R1 R. 500 2 R, 10 V R3 R2 5000 S2 5000 2 Rm 4 10 ks2 501 Substituting in values: Vm = 10 (OT Thus, if the resistance of the measuring circuit is neglected, the measurement sensitivity is 5.00 mV per ohm change in R. 500 %3D TO00) = 5.00mV
Transcribed Image Text:Example 7.2 A bridge circuit, as shown in Figure 7.5. is used to measure the value of the unknown resistance Ru of a strain gauge of nominal value 500 2, The output voltage measured across points DB in the bridge is measured by a voltmeter. Calculate the measurement sensitivity in volts/ohm change in R, if (a) the resistance Rm of the measuring instrument is neglected, and (b) account is taken of the value of Rm- Solution For R, = 500 2, Vm = 0. To determine sensitivity, calculate Vm for R, = 501 2. (a) Applying equation (7.3): Vm = Vị (R,+R,- R+R2 R R1 R. 500 2 R, 10 V R3 R2 5000 S2 5000 2 Rm 4 10 ks2 501 Substituting in values: Vm = 10 (OT Thus, if the resistance of the measuring circuit is neglected, the measurement sensitivity is 5.00 mV per ohm change in R. 500 %3D TO00) = 5.00mV
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