One, JJF1139-2005 "measuring instruments to determine the principles and methods of verification cycle" is to determine the general principles of our verification cycle
JJF1139-2005 technical specifications are based on the international organization of the International Organization of Legal Metrology published the international document OIML D10: 1984 "Determination of the principles of the recalibration interval of the measuring equipment used in testing laboratories" and the American National Standard Laboratory Congress Organization Publishing House NCSLRP-1:1999 "calibration interval confirmation and adjustment" developed. The specification specifies the basic principles and methods for determining the calibration intervals of measuring instruments.
The specification puts forward three basic principles: First, the development or revision of measuring instruments calibration procedures, should be based on the applicable measuring instruments of its own characteristics, the performance requirements of the measuring instruments and measuring instruments to determine the use of its calibration cycle; second is to determine the same period of time for the calibration of measuring instruments, first of all, it should be clear that the measurement of the applicable measuring instruments of the measurement of the reliability of the objectives of the R (general measurement of measuring instruments of the measurement of the reliability of the objective) R ≥ 90%); Third, the determination of the verification cycle of measuring instruments should be appropriately selected reaction method or maximum likelihood estimation method of one or more appropriate methods for analysis and measurement. In these three principles, we can make clear: ① measuring instruments to determine the verification cycle is to ensure that a certain measurement of the reliability of the target under the premise of the performance of the measuring instruments themselves, the characteristics of the use of the situation decided; ② national metrological verification procedures put forward by the verification cycle is based on the premise of the three principles; ③ this cycle is through a certain amount of scientific calculations come.
Second, JJF1139-2005 specification of the cycle of measurement method is the preparation of regulations or or adjust the cycle can be applied
In JJF1139-2005 specification, the measuring instruments of the test cycle proposed by the reaction method and maximum likelihood estimation of the method of two methods. The reaction method and the main "fixed step adjustment method", "incremental reaction adjustment method" and "interval test method" three methods; maximum likelihood estimation method and three specific calculations: Classical Method, Binomial Method & Update Time Method.
Three, the Quality and Technical Supervision Bureau of the amount of hair [2000] No. 182 of the verification cycle of measuring instruments to make the relevant provisions
In order to strengthen the statutory (including authorized) measurement and certification bodies mandatory verification of the work of measuring instruments verification cycle of management, standardize the adjustment of the mandatory verification cycle of the act of mandatory verification to ensure that the mandatory verification of the work of science, fairness and effectiveness, in 2000, 10 issued the "
On the strengthening of adjustments to the work of compulsory testing of measuring instruments verification cycle. On strengthening the adjustment of the mandatory verification of measuring instruments test cycle management notice", the notice, the verification cycle of measuring instruments made four provisions:
1, the national measurement and verification procedures or departments, local measurement and verification procedures (hereinafter referred to as "procedures") in the verification cycle is the regular conditions of the The longest verification cycle, generally applicable to the mandatory verification of measuring instruments, statutory (including authorized) measurement and verification bodies to strictly enforce the general situation does not require adjustment.
2, where two consecutive calibration cycles of qualified rate of less than 95% (the main measurement of performance indicators of measuring instruments) or a (pieces of) measuring instruments for two consecutive calibration cycles of the main measurement of performance indicators failed, the statutory (including authorization) measurement of the calibration body can be based on the relevant regulations, combined with the actual use of appropriate to shorten the calibration cycle, but the shortened cycle of the test shall not be less than 50% of the regulations Provisions of the verification cycle of 50%; shorten the verification cycle of the work of measuring instruments, if two consecutive verification cycle verification pass rate of more than 97% (including 97%) or three times, should be resumed to implement the provisions of the verification cycle.
3, in the adjustment of the mandatory verification cycle, the statutory (including authorized) metrological verification bodies must be adjusted to the local provincial Quality and Technical Supervision application program to adjust the verification cycle, submit copies of the original records of verification and statistical analysis of data and other information, approved by the audit for the record, before adjusting the mandatory verification cycle.
4, the provincial Quality and Technical Supervision to strengthen the statutory (including authorized) metrological verification bodies to supervise the work of mandatory testing, strict audit to adjust the mandatory testing cycle of the application program, if necessary, can hire technical experts to comment. Arbitrary or unauthorized filing to adjust the mandatory verification cycle, to be corrected in a timely manner, and serious to withdraw the authorization of the mandatory verification of the project.
The above four provisions, very clear provisions of the statutory metrological verification institutions in the measurement and verification work in how to determine the verification interval principles and methods.