An apparatus for analysing the condition of a machine, comprising: at least one input for receiving measurement data from a sensor for surveying a measuring point of the machine; data processing means for processing condition data dependent on said measurement data; said data processing means comprising means for performing a plurality of condition monitoring functions (F1, F2, Fn); and a logger for registering use of at least two of said condition monitoring functions (F1, F2, Fn); wherein said logger is adapted to register use of a first condition monitoring function a first rate; and said logger is adapted to register use a second condition monitoring function at a second rate.