a method for measuring electrical signals according to a sampling principle with the assistance of an electron probe , whereby the signal is respectively repeatedly sampled in succession at different phase points , enables a fast registration of an electrical signal at a circuit node of an integrated circuit and simultaneously permits registration when at least one noise signal appears between two clock edges of a basic pulse rate of the integrated circuit . between two successive phase points at which the signal is repeatedly sampled in succession for potential measurement , only a check is executed at phase points by sampling as to whether a noise signal exists in this intermediate region .