User`s guide
116
Figure 10 circuit diagram of Wheatstone bridge
When the bridge is unbalanced, equivalent resistance of the circuit is,
When the circuit is viewed as a circuit divider, the output voltage is,
When the resistance of
changes by a small amount
, the new output voltage is,
If the bridge was originally balanced (
, then we have,
Since change in resistance is really small
, the change in output voltage is,
or,
Eq.68
Eq.69
Eq.70
Eq.71
Eq.72