A neuromodulation device for measuring an evoked response comprising a first electrode; a second electrode, wherein the first and second electrodes are alternately configured as a stimulation electrode; a sensing electrode for sensing an evoked response to a stimulus pulse; and a controller configured to measure an evoked response at the sensing electrode after a stimulus pulse at a first stimulation electrode configuration and after a stimulus pulse at a second alternate stimulation electrode configuration, and to add said pair of measurements.