echemi logo
Product
  • Product
  • Supplier
  • Inquiry
    Home > Calibration of testing instruments

    Calibration of testing instruments

    • Last Update: 2011-09-02
    • Source: Internet
    • Author: User
    Search more information of high quality chemicals, good prices and reliable suppliers, visit www.echemi.com
    Chinese name of testing instrument calibration: instrument calibration alias: instrument calibration instrument detection definition 1: the process of matching the response indication of the instrument with its start signal or with the real value measured by other methods Definition 2: under specified conditions, a group of operations to determine the relationship between the quantity value indicated by measuring instruments or measuring systems, or represented by physical measuring tools or reference materials, and the corresponding quantity value reproduced by standards The purpose is to determine the indication of the measuring device by comparison with the standard Definition calibration refers to the calibration of machines, instruments, etc to make them accurate Under specified conditions, a group of operations to determine the relationship between the measured value indicated by the measuring instrument or measuring system, or the measured value represented by the physical measuring tool or reference material, and the corresponding measured value reproduced by the standard Calibration may include the following steps: inspection, correction, report, or adjustment to eliminate any deviation in accuracy of the compared measuring device The scope of instrument measurement and calibration class a instrument and equipment refers to measuring assurance instruments, working measuring instruments listed in the compulsory verification, and instruments that have a significant impact on product quality, etc A strict management method and weekly inspection plan shall be formulated for class a instruments The verification regulations shall be strictly implemented during the verification, and the period shall also be specified during the calibration Class B instruments and equipment refer to general instruments and equipment with accuracy requirements and clear impact on product quality In principle, the verification period of such instruments and equipment shall not exceed the Zui long period specified in the verification regulation If it is necessary for the work, the verification items can be appropriately reduced or only partial verification can be made, calibration can be used, and the calibration period can be extended after evaluation and test Class C instruments and equipment refer to the instruments and equipment that are subject to one-time verification in accordance with national regulations and have no national requirements for the time being Such instruments and equipment can be put into use after warehousing acceptance and verification, and function inspection can be carried out during use Especially the instruments attached to the equipment Subdivision: it can also be divided into: radio instruments, electromagnetic instruments, time and frequency instruments, length instruments, mechanical instruments, thermal instruments and physical and chemical instruments The basic requirements for instrument calibration are as follows: (1) if the calibration of environmental conditions is carried out in the verification (calibration) room, the environmental conditions shall meet the requirements of the laboratory Temperature, humidity, etc If the calibration is carried out on site, the environmental conditions shall be subject to the conditions that can meet the field use of the instrument (2) as a standard instrument for calibration, the error limit of the instrument shall be 1 / 3 ~ 1 / 10 of the error limit of the calibrated instrument (3) although the personnel calibration is different from the verification, the personnel carrying out the calibration shall also pass the effective assessment and obtain the corresponding qualification certificate Only the personnel holding the certificate can issue the calibration certificate and calibration report, and only such certificate and report can be considered as valid How to calibrate the instrument According to the definition and actual connotation of relevant terms, I think that verification should be mainly used in the occasions with legal requirements, and the occasions without legal requirements can be freely selected according to the conditions; calibration is mainly used in the places with higher accuracy requirements or restricted by conditions, where the measuring instruments with lower accuracy must be used for higher measurement requirements; verification is mainly used in the new products without verification regulations Products, special measuring instruments, or measuring and testing instruments with relatively low accuracy requirements, and test hardware or software for inspection The new products and special measuring instruments can also be used in the occasions where there is verification regulation, but it is not necessary or impossible to fully meet the regulation requirements but can meet the use requirements In accordance with ISO9000 series of standards for quality certification and measurement testing system At present, the understanding and requirements of these three methods are very confused in the confirmation and daily measurement work, and there are mainly three wrong tendencies: first, the requirements under the new situation are generally set into verification and management according to law; second, regardless of the national conditions, the relevant ISO standard words and sentences are mechanically applied, which cannot correspond with the reality; third, the differences of verification, calibration and verification are ignored, and they are mixed with each other I believe that in keeping with international standards, we should not only actively learn from advanced foreign experience, but also dare to adhere to our own strengths Specifically, if the state stipulates compulsory inspection, compulsory inspection shall be carried out in accordance with the law, and the method and scope of compulsory inspection shall be adjusted in time according to the development of the state; otherwise, enterprises shall be allowed to adopt the forms of inspection, calibration, verification, test and comparison according to different needs and conditions At present, verification and calibration should be selected first to facilitate the transition When other forms must be adopted, the existing verification results and experience shall also be used as much as possible When the existing verification regulation is available, the original regulation shall be cut and / or modified as much as possible Only when there is no regulation, the relevant documents shall be formulated separately It should be noted that these forms should be implemented step by step according to certain norms In addition, special attention should be paid to the fact that when using relevant terms, they should be consistent with the terms, meanings and objective reality stipulated in relevant definition standards or generally agreed upon, so as to avoid unnecessary misunderstanding and confusion To achieve this, we should first achieve the consistency of understanding and application of relevant terms To solve these problems, we need not only the efforts of measurement personnel, but also the timely study and adjustment of relevant laws, regulations and policies by the government measurement department.
    This article is an English version of an article which is originally in the Chinese language on echemi.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to service@echemi.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

    Related Articles

    Contact Us

    The source of this page with content of products and services is from Internet, which doesn't represent ECHEMI's opinion. If you have any queries, please write to service@echemi.com. It will be replied within 5 days.

    Moreover, if you find any instances of plagiarism from the page, please send email to service@echemi.com with relevant evidence.