CNAs accreditation body of the hottest Wuwei testi

Wuwei testing instruments and equipment CNAs accreditation institution

Wuwei testing instruments and equipment CNAs accreditation institution

Dongguan Shitong Instrument Calibration Service Co., Ltd. is a third-party laboratory recognized by China National Accreditation Service (CNAs), with accreditation number of l3170, authorized by the international laboratory mutual accreditation organization (ILAC MRA), passed the requirements of ISO17025 international measurement standards, and specialized in instrument measurement, calibration and testing according to law. The company is committed to building the largest, most comprehensive and professional measurement, calibration and testing service organization in China. At present, the company's main businesses are distributed in South China (Dongguan, Shenzhen, Huizhou, Guangzhou, Zhongshan, Foshan, Zhuhai, Fujian, Jinjiang and other cities) and East China (Shanghai, Wenzhou, Suzhou, Ningbo, Kunshan, Zhejiang and other cities), vertically radiating the Yangtze River Delta and the Pearl River Delta. The company has complete instruments and equipment, excellent professional quality, and has professional calibration departments in strict accordance with Chinese regulations, such as electricity, mechanics, length, thermal engineering, weighing apparatus, optics, geometric quantities, etc It is one of the domestic private instrument calibration and testing institutions that has passed many calibration projects (benefiting from the boom of the downstream new energy vehicle industry, which has climbed over 213 CNAs China's recognized projects)

first of all, it should be clear that it is two different concepts to confirm whether the measuring instrument meets the measurement characteristics specified in its instructions according to the calibration results, and whether the measuring instrument meets the expected working requirements according to the calibration results. The expected work requirements refer to the requirements of measurement work on the metrological characteristics of measuring instruments. For example, a certain measurement work requires that the measuring instrument should have a range of 500V DC voltage, and the allowable error should not exceed 0.5V. The metrological characteristics of the measuring instrument are the specific indicators of the measurement ability specified in the specification of the measuring instrument, such as the measurement field, measuring range, allowable error, measurement uncertainty, etc. For example, according to the requirements of the above example, purchasing a DC voltmeter with a range of 600V and an allowable error of 0.3V can fully meet the expected measurement work. The communication between the experimental machine and the computer is generally based on the RS232 serial communication mode. If you buy a DC voltmeter with a range of 600V and an allowable error of 0.6V, even if the instrument fully meets the requirements of its instructions and the conclusion after submission for inspection is "qualified", it is not applicable to this measurement work

instrument metrology in a broad sense refers to the whole field of measurement knowledge. Measuring instruments (meters) refer to measuring instruments that convert measured values into directly observable indicating values or equivalent information. For example, balance, thermometer, ammeter, pressure gauge, etc. are commonly used measuring instruments. At present, there are metrology majors in length, heat, mechanics, electromagnetism, radio, time and frequency, ionizing radiation, optics, acoustics, chemistry, etc., and metrology has formed a discipline. The definition of measurement realizes the activity of unified unit and accurate and reliable quantity value. In order to ensure the accuracy of measurement, it is necessary to strengthen the maintenance and regular calibration of measuring instruments and instruments

conventional calibration instruments include: electrical calibration: multimeter, ohmmeter, millivoltmeter, capacitance meter, oscilloscope, power meter, megger, bridge, signal generator, distortion meter, spectrum analyzer, variable frequency power supply, voltage withstand meter, electronic load, electrostatic meter, wire tester, plug wire comprehensive tester, surface resistance meter, capacitor box, grapher, lithium battery tester, etc Length calibration: caliper, micrometer, steel ruler, tape measure, angle gauge, thickness gauge, plug gauge, dial gauge, gauge block, flat plate, projector, 2-dimensional, 3-dimensional, microscope, film thickness gauge, height gauge, needle gauge, etc Thermal calibration: constant temperature and humidity machine, thermometer and hygrometer, salt spray machine, oven, low temperature oven, environmental test chamber, yellowing resistance test machine, furnace temperature tester, multi-point collector, etc Mechanical calibration: tensile testing machine, push-pull tester, torsion batch, dynamometer, weight, pressure gauge, electronic scale, balance, hardness tester, impact testing machine, rupture strength testing machine, etc

in addition, in practice, special attention should also be paid to maintaining consistency with the terms, meanings and objective reality specified in the relevant definition standards or generally agreed upon when using relevant terms, so as to avoid unnecessary misunderstanding and confusion. To do this, we should first achieve consistency in the understanding and application of relevant terms. To solve the above problems well, it requires not only the efforts of the majority of measurement personnel, but also the measurement departments to study and adjust relevant policies in a timely manner, and carry out macro norms and guidance

output: Ma ● few maintenance requirements ● heating optical design avoids condensation ● fault self diagnosis function ● low cost for long-term use ● five-year rated cost quality assurance ● introduction to technical characteristics of low energy consumption infrared combustible gas detector is a non-interference intelligent product with good safety performance and flexible and simple operation. One of the main features of this detector is its automatic calibration function, which can guide the operator to calibrate step by step through the prompts on the backlit LCD screen. The infrared gas detector provides three different output modes: analog signal 4~20ma DC; RS-485 communication interface and three relays (two alarms and one fault self-test). The alarm bell can be debugged and programmed on site. These different output modes provide great flexibility for the establishment of the system. Only 4~20ma DC output is provided. The control circuit is based on the microprocessor chip, packaged into a plug-in module and connected to the standard connection template. Sensors and signal generators ranging from nano scale, 10000 times thinner than human hair, to macro scale (measured in millimeters) are installed in an explosion-proof enclosure with a glass cover. The digital display with backlight can display both sensor readings and menu functions during programming. All infrared gas detectors belong to the electrical classification: classi; groupsb，c，d； division1。 This product series continues the concept of "easy installation and easy maintenance" embodied in the design of gas sensors

measurement is a science of scientific measurement. Although the manufacturer is responsible for the output and calibration and complies with the equipment requirements, the metrology laboratory must verify the accuracy of the instruments and meters in the manufacturer's instructions. A professional test station equipped with special control system and real-time database is used to record and store test data. The control result shows that the maximum force exerted by penetrating the gasket represents the system regulation test station, and it is carried out item by item in precise steps to verify the accuracy in the manufacturer's instructions. The control system must also record each test in detail and evaluate the calibration of each instrument. Measurement is an important guarantee of product quality. Measurement is the final technical means to objectively evaluate the quality of products. Measurement calibration is the main technical measure to control the process parameters of the production process and ensure the processing quality. Measurement calibration, as an important part of ISO9001 certification and factory audit, has been paid more and more attention by factories

metrological verification method 1) overall verification method: the overall verification method is also called comprehensive verification method, which is the main verification method. This method is to verify the metrological characteristics of measuring instruments directly with metrological benchmarks and standards. Advantages the advantages of the whole verification method: simple, reliable, and can obtain the correction value. If the measured instrument needs and can take the correction value, the measurement times should be increased (for example, increase the 3 times to 5~10 times in general) to reduce the random error

the purpose of verification is to make a mandatory and comprehensive evaluation of the measuring device. This comprehensive evaluation belongs to the scope of the unity of quantity and value, and is a top-down quantity and value transmission process. The verification shall evaluate whether the measuring instruments meet the specified requirements. This requirement is the error range specified in the verification regulation of measuring devices. Through verification, evaluate whether the error range of the measuring device is within the specified error range. Objects with different calibrations are measuring devices that are not subject to compulsory verification. It mainly refers to the measuring instruments widely used in the process of production and service provision, including the measuring instruments used in incoming inspection, process inspection and final product inspection

Wuwei testing instruments and equipment CNAs accreditation institution