Checking and calibration
Checking: refers to all the work carried out to assess the measurement performance of measuring instruments and determine whether they are qualified, including inspection and sealing and stamping.
Calibration definition: a set of operations to determine the relationship between the quantitative value indicated by a measuring instrument or measuring system, or represented by a physical gauge or reference material, and the corresponding quantitative value reproduced by a standard under specified conditions.
Calibration and verification are two different ways and means of ensuring the accuracy and validity of a measurement. Calibration and verification from the traceability, they are the same, but from the legal effect, they are different.
GJB9001A-2001 standard 7.6 clause a) requirements: against the traceability to international or national standards of measurement standards, if necessary, measuring equipment should be in accordance with the specified time interval or before the use of calibration or verification.
The word "or" in the standard establishes the juxtaposition and optional relationship between calibration and verification. Under the premise of meeting the laws and regulations, enterprises and institutions can choose their own method of verification or calibration for different situations.
Similarities and Differences:
The similarities between calibration and verification are: both are an effective and reasonable method and means of traceability, and the purpose is to achieve traceability. The difference between the two is.
1. Accreditation is a comprehensive assessment of the measurement characteristics of measuring instruments; and calibration is mainly to determine its value.
2. Accreditation of measuring instruments to make a qualified or unqualified conclusion; and calibration does not determine the qualification of measuring instruments.
3. Accreditation should be issued certificate, stamped or notice of failure; and calibration is issued calibration certificate or calibration report.
4. Accreditation is based on measurement and verification procedures; and calibration is based on calibration specifications.