Figure 12.11b shows a circuit using the strain gauge. The strain gauge elements
are mounted in two arms of the bridge and two resistors, R1 and R2, form
the other two arms, R3 and R5 are the conditioning for the zero offset and span,
respectively. The output signal from the bridge is amplified and impedance
matched, as shown. The strain gauge elements are in opposing arms of the
bridge, so that any change in the resistance of the elements due to temperature
changes will not affect the balance of the bridge, giving temperature compensation.