The electromyographic signals (EMG) also known as myoelectric signals, occur with movements of contraction and distension of muscles. These can be generated on a voluntary way; they are widely used for their functionality to control man -machine interfaces. During recent years it has been sought to figure out of these signals for the development of arm or leg prostheses. In the present research, a system of capturing, through the amplification and filtering of myoelectric signals, it was implemented a test system control in a hand prosthesis. The outcomes of the measurements of the voltages generated, had shown the performing of a grip prehensile, also can be infer the validate signal with computational tools to verify the correct operation of the proposed system and have a more faithful and stable parameterization.