A technique and apparatus for measurement of resistances of 0.01 ohm and s without disconnection from the circuit. The invention is used for measurement of degradation in cable shields by measuring the droop caused by circuit resistance in an induced current pulse in the undisconnected circuit. The method can also be used for measurement of junction resistances in high current circuits such as auto starters. The invention allows measurements to be made with the circuits connected so that the faults are present in the measurement setup. The method includes inductive coupling of long duration repetitive current pulses onto the circuit under test, measurement and display of induced current pulses, and display of induced current pulses on an oscilloscope.