My task was to investigate and solve an ICT measurement technical problem in the factory of Robert Bosch Elektronika Ltd. Hatvan. The issue was a leakage current measurement error on a power module based on MOSFETs, because of the parasitic effects of the wiring between the product and the measurement device. Having collected the necessary information, I examined the base of the problem and suggested a solution for that. An additional electronic circuit was needed for the measurement, which had the role, to compensate the error caused by the integrated resistors of the product. After I discovered the design failures of the previous version, on the basis of my observations and calculations I designed a new module for the test system, besides I suggested changing some of the wires in the measurement device. I also designed a manual contacting device, which made the measurement process in the laboratory easier. With the help of this device, I was able to test the circuit I planned, and I managed to observe the effects of the wiring on the leakage current measurements. After considering several solutions, I found the primary error source, and I made a reconstruction on the test systems of the production line.