量块检定规程JJG100—73和JJG146—76第4条都规定使用中的量块,每隔一定时间应检定一次。这种定期进行的检定即所谓周期检定。一、为什么要周期检定 1.量块的材料在冷,热加工过程所残留下来的各种应力不可能完全消除,致使量块的尺寸在不停地发生微小的变化。为保证量块尺寸变化量不超出允许范围,就需要进行周期检定。 2.量块在使用时,其两个工作表面常与被 Gauge test procedures JJG100-73 and JJG146-76 Article 4 provides that the use of the measuring block, at regular intervals should be tested once. This regular check is the so-called cycle test. First, why cycle test 1. The amount of block material in the cold, thermal processing of the residual stress can not be completely eliminated, resulting in the size of the block in the tiny changes occur. To ensure that the amount of changes in the size of the block does not exceed the allowable range, you need to cycle test. 2. The amount of blocks in use, its two work surfaces often with