RT2 and RT4 decreases by 0.3Ω
A. 3 and 4
B. 1 and 2
C. 1 and 4
D. 2 and 3
Answer:A
RT2 and RT4 decreases by 0.3Ω
A. 3 and 4 B. 1 and 2 C. 1 and 4 D. 2 and 3
Explanation: When external weight is applied to the platform. One pair of element elongate and the other pair compresses. Therefore, RT1 and RT3 is △R and the increase in RT2 and RT4 is also by △R. 9. The gain of the differential amplifier is -125. Assume the voltage applied to bridge circuit Vdc=+10v and the unstrained resistance of four element of strain gage is 200Ω. When a certain weight is placed on the platform, the output voltage Vo=5v. Determine the change in resistance of each strain gage for analog weight scale. (Assuming the output is initially nulled).