上海第二光学仪器厂生产的HX-1000型显微硬度计,在更换不同形状压头后(维氏或努氏)需要重新进行零位校正,但由于该厂生产的显微硬度计物镜下调正圈无滚花,较光滑,而且物镜在调焦时下调正圈与显微硬度标准块上平面距离极小,手不容易伸进去握住下调正圈,故调正较困难,有时需一人观察视场,另一人帮助旋转下调正圈,这对于需经常更换不同压头的测试人员来说,既费时、费力,且工作效率低。 HX-1000 microhardness tester produced by Shanghai No.2 Optical Instrument Factory needs to be re-calibrated after changing the pressure head of different shapes (Vickers or Knud’s), but due to the down-regulation of the micro-hardness tester Knurled knurled, more smooth, and the objective lens in the focus when the correction ring and microhardness standard block on the plane distance is minimal, the hand is not easy to hold down the correction ring, it is more difficult to adjust, and sometimes need a person Observing the field of view, another person to help spin down the positive circle, which for the need to frequently change different indenter testers, both time-consuming and laborious, and low efficiency.