The accuracy (accuracy) of the instrument used is tested to a standard using a standard measuring instrument, and is generally used for instruments with high precision. main effect: 1. Determine the input-output relationship of the instrument or measurement system, and assign the instrument or measurement system graduation value; 2. Determine the static characteristics of the instrument or measurement system; 3. Eliminate system errors and improve the accuracy of the instrument or system; 4. In scientific measurement, calibration is an important step that cannot be ignored; The meaning of the verification: Self-administration procedures prepared by the company in the absence of verification or calibration procedures; Mainly used for special measuring instruments, or relatively low-precision measuring instruments and testing hardware or software; The meaning of the verification: The legal measurement department or the statutory authorized organization shall, in accordance with the verification regulations, provide evidence through experiments to determine the activities of the indication errors of the measuring instruments to meet the specified requirements; The meaning of calibration: Under the specified conditions, in order to determine the indication value of the measuring instrument or measuring system or the indication value represented by the physical measuring instrument or the standard substance, the same measured object is tested by the high-precision qualified standard equipment and the metered equipment. A set of operations of the metered device relative to the standard device error is obtained, thereby obtaining a correction value for the indicator data of the metered device. The main differences between calibration, verification, calibration and verification: 1. Calibration is a dynamic process that checks the accuracy of the test equipment and eliminates the error in time when it is measured; 2. Verification, calibration, and verification are static measurement processes performed on a periodic basis; Verification and calibration are the two most important means of traceability, but they are very different. Let's learn the difference between them: (1) Different purposes The purpose of the calibration is to evaluate the indication error of the measuring device against the measurement standard, to ensure that the quantity is accurate, and belongs to a set of operations traced from the bottom-up value. This indication error shall be assessed in accordance with the organization's calibration procedures, in accordance with the calibration cycle, and the calibration record and calibration mark shall be made. Calibration In addition to assessing the indication error of the measuring device and determining the relevant metering characteristics, the calibration results can also be expressed as correction values ​​or calibration factors that specifically guide the operation of the measurement process. Purpose of the verification: A mandatory comprehensive assessment of the measuring device. This comprehensive assessment belongs to the scope of uniformity of values, and is a top-down process of magnitude transfer. The verification shall assess whether the measuring instrument meets the specified requirements. This requirement is the error range specified by the measuring device verification procedure. Through the verification, it is assessed whether the error range of the measuring device is within the specified error range. (2) Different objects The object of calibration is a measuring device that is outside the mandatory test. China's non-mandatory verification measuring devices mainly refer to measuring instruments used in a large number in the production and service provision process, including the measuring instruments used in incoming inspection, process inspection and final product inspection. The object of the verification is the measurement device for the mandatory verification specified in China's measurement method. Article 9 of the "Measures Law of the People's Republic of China" clearly stipulates: "The highest measurement standard equipment used by the administrative department of the people's government at or above the county level for the public public measurement standard equipment, departments, enterprises and institutions, as well as for trade settlement and security protection. In the medical and health, environmental monitoring, the work measuring instruments listed in the strong inspection catalogue shall be compulsory. If they fail to apply for verification or fail to pass the inspection according to the regulations, they shall not be used." The verification objects are mainly divided into three major types of measuring instruments: 1 The measurement basis (including: international [metering] benchmark and national [metering] benchmark) ISO1OO12-1 <Quality Assurance Requirements for Metrology and Testing Equipment†is defined as: International [Measuring] Benchmark: “According to international agreements, it is used internationally as a basis for the valuation of all other measurement benchmarks for related quantities.†National [Measuring] Benchmark: “According to the official decision of the State, it is used as a measurement basis for the valuation of all other measurement standards for the relevant quantity in the country.†2 Measurement Standards The ISO1OO12-1 standard defines the “measurement†standard as: “The physical measurement used to define, implement, maintain or reproduce a unit or one or more known quantities and pass them to other measuring instruments by comparison. , measuring instruments, reference materials or systems" (Example: a.1kg quality standard; b) standard gauge block; c) 100Ω standard resistance; d) Weston standard battery)." 3 China's Metrology Law and the People's Republic of China compulsory verification of the list of work measuring instruments specified, "Where used for trade settlement, security protection, medical and health, environmental monitoring, mandatory verification." In this detailed list, it has been clearly stipulated More than 60 types of measuring instruments are listed for mandatory verification. It is worth noting that the second paragraph of this "Detailed Catalogue" clearly emphasizes that "the items in this catalogue are used for trade settlement, security protection, medical care, environmental monitoring, and all are subject to compulsory verification." The measuring instruments in a variety of strong inspection catalogues are only for measuring instruments in four categories such as trade settlement, which are within the scope of mandatory verification. For the measurement instruments that are included in the catalogue of more than 60 types of measuring instruments, but the actual use is not in the four categories of trade settlement, it may not be within the scope of mandatory verification. Measurement devices other than the above three categories are non-mandatory, that is, calibration ranges. (3) different nature Calibration is not mandatory and is a voluntary traceability of the organization. This is a technical activity that assesses the indication error of a measuring instrument and the process of setting the value of the measuring instrument or standard substance according to the actual needs of the organization. The organization can specify calibration specifications or calibration methods based on actual needs. Self-defined calibration cycle, calibration mark and record. Verification is a mandatory act and belongs to the scope of legal metrology management. Among them, the verification procedure agreement cycle and so on are all carried out according to legal requirements. (4) According to different The main basis for calibration is the “Calibration Specification†formulated by the organization according to actual needs, or refer to the requirements of the “Regulationsâ€. In the Calibration Specification, the organization specifies the requirements for calibration procedures, methods, calibration cycles, calibration records, and identification. Therefore, the Calibration Specification is a guidance document for the organization to implement calibration. The main basis for the verification is the “Metrics Verification Regulationsâ€, which are statutory technical documents that must be observed in the verification of measuring equipment. Among them, the verification period, measurement characteristics, verification items, verification conditions, verification methods, and verification results of the measurement and testing equipment are usually specified. The metrological verification procedures can be divided into three types: national metrological verification procedures, departmental metrological verification procedures, and local metrological verification procedures. These procedures are statistical documents that are not mandated by the organization and must be developed by an approved authorized metrology department. (5) Different ways The method of calibration can be carried out by means of internal calibration of the organization, external school, or a combination of internal school and external school. When the organization has the conditions, the measuring instrument can be calibrated by internal school, which saves a lot of money. The internal calibration of the organization should pay attention to the necessary conditions (internal school is very strict!!), rather than the management relaxation requirements of measuring instruments, for example, calibration specifications or procedures must be prepared, the calibration cycle must be specified, and the necessary calibration environment and A certain quality metering staff has at least one standard measuring instrument higher than one level, so that the calibration error is reduced as much as possible. In most measurement areas, the standard measurement error should not exceed 1/3 to 1/10 of the error in the device being used. In addition, calibration records and markings should also be specified. The verification must be carried out in a qualified metrology department or a legally authorized unit. According to China's current situation, most production and service organizations do not have qualifications for verification. Only a few large organizations or professional metrological verification departments have such qualifications. (6) different cycles The calibration cycle is determined by the organization based on the needs of the metering device. It can be calibrated periodically or irregularly or calibrated before use. The calibration cycle should be determined by maintaining the minimum calibration cost while minimizing the risk of the measuring device being in use. The period of calibration can be determined based on the frequency or degree of risk used by the meter. The period of verification must be carried out in accordance with the provisions of the "Regulations", the organization can not determine. The verification cycle is a mandatory constraint. (7) Different content The content and items of the calibration are only to assess the indication error of the measuring device to ensure accurate values. The content of the verification is a comprehensive assessment of the measuring device, the requirements are more comprehensive, in addition to the entire content of the calibration, the relevant items need to be verified. For example, the verification content of a certain measuring instrument shall include the technical conditions of the measuring instrument, the verification conditions, the verification items and verification methods, the verification period and the disposal of the verification results. The content of the calibration can be determined by the organization as needed. (8) Different conclusions The conclusion of the calibration is only to assess the magnitude error of the measuring device, to ensure that the magnitude is accurate, and that no pass or fail determination is required. The results of the calibration can be given a Calibration Certificate or a Calibration Report. The verification must be based on the range of magnitude error specified in the “Verification Regulations†to give a judgment on the pass and fail of the measuring device. Exceeding the range of error specified in the "Verification Regulations" is unqualified, and is within the specified range of error. The result of the verification is the "certification certificate". (9) Different legal effects The conclusion of the calibration does not have legal effect. The calibration certificate given only indicates the magnitude error and belongs to a technical document. The conclusion of the verification has legal effect and can be used as a statutory basis for the verification of measuring instruments or measuring devices. The "certification certificate" is a technical document with legal effect. 800 Puffs Vape,Electronic Smoke,Puff Bar Electronic Cigarette,Pure Smoke Electronic Cigarette Guangzhou Yunge Tianhong Electronic Technology Co., Ltd , https://www.e-cigaretteyfactory.com