The improving method of the exchange system of the type HB 3000 Brinell tester and the operation program of the hardness tester after improvement are introduced. And the improvement effect is described.

• 介绍了 HB- 30 0 0型布氏硬度计换向系统的改造方法及改造后硬度计的工作程序 ,并就改进效果进行了论述。