| CPC G01R 23/167 (2013.01) | 16 Claims |
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1. A method for monitoring status of an apparatus by measuring an analog signal which is continuous in terms of time and value and which represents a status variable of the apparatus, the method comprising:
converting the analog signal, at scanning times within a measuring interval, into a digital signal via an analog-digital converter which is operated within a measuring range;
cutting signal portions of the analog signal which extend beyond the measuring range in the digital signal for portions of the analog signal which exceed the measuring range; and
applying a spectral analysis to the digital signal to determine which frequency portions of the analog signal are included in a frequency spectrum, and to conclude a malfunction of the apparatus exists based on a comparison of the frequency portions of the analog signal included in the frequency spectrum and known frequencies which indicate a presence of damage;
wherein in an event that, at a scanning time, the analog signal which extends beyond the measuring range is cut in the digital signal, this event is detected and is determined as a number; and
wherein a signal quality is provided as a quotient from a number relating to an overall scanning number within the measuring interval, and the signal quality is utilized to assess whether the known frequencies which indicate the presence of damage are still identifiable from the determined frequency portions of the frequency spectrum, additional overcontrol portions occurring in the frequency spectrum as a result of cut signal portions.
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