How to calibrate the reading microscope of a Vickers hardness tester HV?

The calibration of the reading microscope of the Vickers hardness tester HV is an important step to ensure measurement accuracy and must be carried out according to standard procedures.
First, prepare a standard scale, place it on the instrument workbench, and adjust the microscope focus so that the scale markings are clearly imaged. Then, observe the crosshairs inside the microscope, align them with the zero scale line of the standard scale, and record the reading of the microscope drum at this time.
Next, move the workbench to align the crosshairs with a certain scale line of the standard scale, record the drum reading again, and calculate the deviation between the difference of the two readings and the corresponding scale value of the standard scale. If the deviation is within the allowable range, the calibration is qualified; if the deviation exceeds the range, it is necessary to adjust the mechanical transmission mechanism or optical system of the microscope and repeat the calibration steps until qualified.
After the calibration is completed, a calibration record must be filled out, and re-calibration should be performed regularly. Calibration work should be operated by professional metrology personnel using a certified and qualified standard scale.

Kunshan Fuze Testing Equipment Co., Ltd. can provide reading microscope calibration services and technical guidance. The FV810 / FV310 and other Vickers hardness testers from Taiwan Zhongze Company have high-precision reading microscopes. If you need help related to calibration, welcome to call for consultation.