User`s guide
66
Figure 6 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.10
Eq.11
Eq.12
Eq.13
Eq.14