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本文在规定环境条件下,选用HRA,HRB和HRC标尺对硬度块(包括82.0HRA,65.9HRA,100.9HRB,87.3HRB,53.7HRB,59.8HRC,45.6HRC,28.1HRC,以下简称HRA高、HRA中,HRB低、HRB中、HRB高,HRC高、HRC中、HRC低)进行硬度试验,测得HRA,HRB和HRC值,进行不确定度的评定。