A self-balancing bridge for in-circuit resistance measurement

This letter deals with a novel and versatile bridge setup for the direct measurement of in-circuit resistance. Unlike other directreading bridges, it is a balanced, active bridge. It basically employs an active RC integrator, a fixed standard resistance, and a reference voltage source. The steady-state output voltage of the integrator is found to be directly proportional to the unknown resistance. Test results show the accuracy of measurement to be of the order of 1 percent in the range of 0.4 to 60 kΩ.