求翻译：7.3 用作检查硬度计操作而提供的测试块（橡胶或弹簧式）不可作为可信的标定标准。在第7.1与7.2节规定的标定程序是仅有的有效的标定方法。是什么意思？

7.3 Check the hardness of operation for providing the test blocks (rubber or spring-type) is not as reliable calibration standards. 7.1 and 7.2 in the first calibration procedure is required only effective calibration method.

正在翻译，请等待...

7.3 serves as measured the briquette which the inspection sclerometer operation provides (rubber or spring type) cannot take the credible demarcation standard.The demarcation procedure stipulated which in 7.1st and 7.2 only has the effective demarcation method.

7.3 as a hardness meter operation check and provide test blocks (rubber or springs) is not available as a trusted calibration standards. Calibration procedure provided for in section 7.1 and 7.2 are the only effective method of calibration.

7.3 Check the hardness of operation for providing the test blocks (rubber or spring-type) is not as reliable calibration standards. 7.1 and 7.2 in the first calibration procedure is required only effective calibration method.