Question

A strain gage has a nominal resistance of 100 Ohms and a gage factor of 2.1. If it is used in a quarter bridge with other resistors being 100 Ohms and a supply voltage of 2.3 V, what will be the measured voltage when there is 11900 μstrain acting on the gage?

Answer 1

Answer:

Vo = 12.5 mV

Explanation:

given data

nominal resistance = 100 Ohms

gage factor = 2.1

other resistors = 100 Ohms

supply voltage = 2.3 V

strain = 11900 μ

solution

we get here voltage so we use here strain output formula

∈α = $\frac{Vo(R_2+R_{3i})^2}{V_s S\ R_2\ R_{3i}}$

put here value

11900 = $\frac{Vo(100 + 100)^2}{2\times (2.1)(100)(100)}}$

solve it we get

Vo =  12495 V

Vo = 12.5 mV