Abstract − An automatic test system for clinical electrical thermometers was developed to enhance the efficiency of error tests. Besides the temperature measurement unit, mechanical drive and machine vision units were designed to implement automatic tests. An uncertainty analysis was also presented. According to the special measurement action of clinical thermometers, the Monte Carlo method was used to evaluate the uncertainty. The accuracy of recognition of indications was greater than 99 % in experiments. 2. SYSTEM The structure of the system is showed in Fig.1. It involves three functional units: water temperature measurement and control unit, mechanical control and transmission unit, and machine vision unit. These units communicate with the upper computer and make up a coordinated system
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