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一、关于压针最大伸出长度JJG304-2003《A型邵氏硬度计》检定规程规定,压针最大伸出长度应为(2.50±0.04)mm,也就是压针伸出长度的最大允许误差是±0.04mm。按照硬度计算公式HA=100-l/0.025可知,硬度的偏差会达到1.6HA,这远远超过了JJG304-2003规定的压针伸出为零和最大时硬度计的最大允许误差的绝对值(0.5HA)。若两个位置都考虑极限值,在压针从伸出长度为零变到伸出
First, on the maximum length of the pressure needle JJG304-2003 “A-type Shore Hardness Tester” test procedures stipulate that the maximum length of the pressure needle should be (2.50 ± 0.04) mm, which is the maximum allowable length of the needle out of tolerance error Is ± 0.04mm. According to the hardness calculation formula HA = 100-l / 0.025 shows that the hardness of the deviation will reach 1.6HA, which far exceeds the JJG304-2003 provisions of the needle out of zero and the maximum hardness of the absolute maximum allowable error 0.5HA). If the limit is taken into account in both positions, the pressure needle extends from zero to extend