1, with different legal basis.
CMA is based on Article 22 of Metrology Law; CAL is based on Article 19 of Standardization Law and Article 19 of Product Quality Law; CNAS is based on GB/T27025-2008 (equivalent to ISO/IEC 17025:2005).
2. The evaluation basis is different.
CMA and CAL are based on laboratory accreditation criteria (revised by ISO/IEC 17025: 2005); CNAS is based on CNAS/CL0 1: 2006 Accreditation Standard for Testing and Calibration Laboratories (equivalent to ISO/IEC 17025: 2005).
3. Different types
CMA is recognized at the national and provincial levels; CAL is recognized at the national and provincial levels; CNAS is accredited by the national laboratory. ?
4, the evaluation object is different.
CMA is a third-party testing/calibration laboratory, providing fair data to the society. CAL is a quality inspection organization established or authorized by the quality and technical supervision department according to law. CNAS is the first, second and third testing/calibration laboratory in all walks of life. ?
5. Different executing agencies
CMA is a quality supervision department at or above the provincial level, and it is a national metrological certification industry review group. CAL is a quality supervision department at or above the provincial level and a national metrological certification industry review group. CNAS is China National Accreditation Committee for Conformity Assessment (CNAS).
References:
Baidu encyclopedia -CMA
Baidu encyclopedia -CAL
Baidu encyclopedia -CNAS