the newton raphson iteration only one solution of mass u03b4m cb should exist for the sensor measurement being equal to zero this means there is only one root even after following the above requirements system noise may be a concern in the hypothetical illustration of fig2 a larger initial test action which changes the system to point c is preferable to the one that changes it to point b this is evidenced by comparing the slopes of lines 22 24 and 26 which result from the various test mass perturbations depicted in fig2 the difference between the before and after test measurement should be large enough to obtain a good approximation of the slope of the function and ensure that the resulting change in the measurement dominates the changes due to system noise fig3 depicts a schematic representation of a washing machine 81 which may be adapted for use in association with the present invention those skilled in the art can appreciate that the present invention may be implemented within a rotating device or rotating system such as for example washing machine 81 those skilled in the art can further appreciate however that other types of rotatable systems or rotating devices may be utilized in accordance with the present invention note that as utilized herein the terms u201c rotating system u201d u201c rotating device u201d u201c rotating apparatus u201d u201c rotatable apparatus u201d u201c rotatable system u201d or u201c rotatable device u201d may be utilized interchangeably the methods.