It is generally difficult to carry out and measure breaking moments precisely in the mNm range. Instead of traditional methods using brake and additional mechanical elements to determine torque vs. angular velocity characteristics of micro-motors this paper suggest a new procedure based on purely electrical measurements. Theoretical background of the measuring procedure is discussed detailed. The suggested method is shown in the case of a RF300E DC micro-motor. © 2007 Springer-Verlag Berlin Heidelberg.