BE 2350 Chapter : Solutions To Homework 4
Document Summary
The resistive components in a d. c. bridge have the following values: The nominal value of ru is 300 . Given data: r1 = 500 ; r2 = r3 = 5000 ; vi = 10v ; 500 ur at 100 c and varies at rate of +0. 5 / c. Thus, output changes by +0. 827 mv when the temperature increases by 1 c. Hence, the measurement system sensitivity is 0. 827 mv/ c. Let current flowing from a to b be i. Assuming that the voltmeter measuring the output voltage ov is a high impedance one, the current flowing through the meter will be negligible. Hence, the current flowing from b to c is also approximately i. For i = 100ma = 0. 1 amps (the maximum permissible current in one strain gauge), the corresponding input voltage. Iv can be calculated from ohm"s law as: Input voltage across ac = (current flowing from a to c) (resistance between a and c)
