Testing machines for static loading have common characteristic features which are independent from machine purpose and design. Sheer machine properties can affect the test result. Some of these influence factors which are of special interest for the moment, have been mentioned and possibilities pointed out how to reduce or eliminate the influences. More details have been given on the influence of machine stiffness and its diminution by the controlled hydraulic machine, as well as on the influence of the load measuring device and the necessity of an inertialess load measurement for certain tests.