The programmable integrator is a digital instrument used for estimating the area or coulombs rapidly and accurately in any portion of I-t curve (current-time). There are two ways by which programming can be done. In the first method, the scanning potential limits have to be set, The instrument measures the coulombs directly irrespective of scan rate. Integration can be carried out on any I-t curve which is got by varying sweep signal in a programmed mode. In the second method, starting potential and period of integration have to be set. Integration will be carried out from the instant the sweep reaches the starting potential for the programmed time period.