Patent ID: 7539599

Claim:
An abnormality diagnosing method comprising: acquiring in advance a plurality of sets of data of a plurality of types of information related to a condition of an electronic device; determining an index value calculation equation for calculating an index value employed for a condition appraisal of the electronic device based on a reference data group made up of said plurality of sets of data; acquiring said data of a plurality of types of information about the electronic device that serves as the subject for condition appraisal; calculating an index value based on said index value calculation equation and said data of a plurality of types of information acquired about said electronic device that serves as the subject for condition appraisal; and appraising the condition of said electronic device that serves as the subject for condition appraisal and diagnosing the occurrence of abnormality in said electronic devices based on a result of a comparison result of said index value and a reference value established in advance, wherein acquisition of the plurality of sets of data that make up said reference data group is performed for a plurality of electronic devices of the same type as said electronic device that serves as the subject for condition appraisal during operation tests following the manufacture of said plurality of electronic devices, and the reference data group containing all of said plurality of sets of data acquired during the operation tests conducted on said plurality of electronic devices is employed as an initial reference data group for determining said index value calculation equation.