显微硬度计的力值正确与否,将直接影响仪器的示值精度。由于显微硬度计是采用小负荷(1kgf以下)试验,又受到仪器空间容量的限制,因此在很长时间内显微硬度计的力值测定未能得到较好的解决,从而影响显微硬度试验的可靠性和正确性,也影响显微硬度计的制造质量。显微硬度计的检定规程中明确规定:硬度计的负荷误差,对等于和小于100gf的负荷,允许在±1.5％以内,大于100gf的负荷误差应小于±1.0％,其变动度分别不大干1.5％和1.0％。目前,国内还没有小量程测力计,所以测定显微硬度计的负荷时,必须对现有仪器进行改装或自行设计。以往所用的显微硬度计的测力装置主要有以下三种: 1.光学测力计 2.改装机械天平 3.电阻应变式传感器测力装置 The value of the microhardness of the force is correct or not, will directly affect the instrument indication accuracy. Since the microhardness tester is a small load (1kgf below) test, but also by the instrument space capacity constraints, so for a long time the microhardness of the force value measurement can not be better resolved, thus affecting the microhardness Test reliability and correctness, but also affect the manufacturing quality of microhardness tester. Microhardness test procedures clearly states: the hardness of the load error, for equal to and less than 100gf load, allowed within ± 1.5%, load greater than 100gf load error should be less than ± 1.0%, the degree of variation were not large 1.5% and 1.0%. At present, there is no small-scale dynamometer in China, so when measuring the load of the micro-hardness meter, the existing instruments must be modified or designed. Previously used microhardness measuring device has the following three: 1 optical dynamometer 2 modified mechanical balance 3 resistance strain gauge sensor force measuring device