The goal of this experimental project is to analyze the new systematic errors that have accrued in pressure setup in one of the laboratories of IMFUFA recently and also to elucidate whether the solution that has been suggested by one of the academic staff of physic departmnent is right or not. His idea is the problem has been caused by some conduction through the pressure oil that we model it with three leaking resistances. Our method was using the oil as a dielectric between plat of a capacitance and investigate its behaviour in different frequencies. The setup is available in one of the laboratories of IMFUFA and it consists of two different measurement methods. In some level of our work instead of liquid itself we use Debye model in our calculation. Even the debye model is too simple compared to the liquid but still gives some of its behaviour.