All the mechanistic and kinetic information for an electrochemical reaction lies on the i-E-t surface. The collection of all these data is almost impossible without a computerized polarograph. This paper describes the construction of such an instrument. For the creation of the software that controls a three-dimensional polarograph, Labview, a special programming language for data now programming, was used. In this language the programmer designs the black diagram of the control program and this block diagram is the actual program. In this way the programming work is considerably simplified. In order to test the instrument, the electrochemical oxidation of the iodide ion on mercury was studied.