Patent ID: 8862434

Claim:
A maintenance expert system including a measuring instrument, the measuring instrument comprising: a CPU comprising a plurality of internal timer counters and having a function of receiving inputs of signals from various sensors which detect a state of the measuring instrument and calculating a measured value of an object to be measured based on detection values of the various sensors; a power supply circuit for activating (ON) or stopping (OFF) the measuring instrument; a display unit for displaying detection input data, which is input from the various sensors to the CPU, and the measured value of the object to be measured, which is calculated by the CPU; a real-time clock IC (RTC) connected to the CPU via a bus line, for measuring time; an EEPROM connected to the CPU via a bus line, for storing data input to the CPU; and an FeRAM connected to the CPU via a bus line, for storing input values from the various sensors via the CPU, storing the measured value calculated by the CPU based on the detection values from the sensors as a calculation result, and storing a corresponding timing at which the calculation result is saved.