Wheatstone Bridge Sensitivity

One of the important properties of a bridge is the sensitivity of the unbalance voltage to changes in some bridge parameter. In the self-balancing bridge, the uniformity of the null sensitivity, as well as the peak value of sensitivity, is relevant. The sensitivity of the four-arm Wheatstone bridge is reexamined from this point of view, with particular regard to the problem of the interchange of the generator and detector. It is shown that a single parameter set of universal curves suffices to describe the sensitivity variation of both configurations.