Electronic platform scale indexing value and understanding

In the production process of electronic bench scale indexing and understanding of electronic scales, due to the needs of industrial measurement processes, in order to ensure the accuracy of the weighing process, we often require that we control the weighing process, such as reducing the weighing error, during the establishment of verification procedures Etc. Usually, the user will impose stringent or excessive requirements on the instrument supplier. This paper discusses the influence of the calibration value and the actual index value on the uncertainty of the electronic platform scale and establishes a period verification program to achieve the measurement process. Claim.

Take 150kg electronic platform scale as an example to discuss the evaluation process of the electronic scale's uncertainty. 1 Overview 1.1 Measurement basis: JJG539-1997 "Digital Indicating Scale" verification procedures. 1.2 Environmental conditions: normal temperature. 1.3 Measurement standard: M1 level weight. 1.4 Measured object: electronic platform scale: verification division e: 50g; actual division d: 20g; maximum weighing: 150kg; maximum allowable error: (1~25) kg: ± 25g, (25~100) kg: ±50g,(100~150)kg:±75g. 1.5 Measurement process: The method of direct loading and unloading with weights is used to measure the difference between the indication value of the electronic platform scale and the nominal value of the standard weight in sections, that is, the error value of the calibrated electronic platform scale. 2 Mathematical Model and Sensitivity Coefficient 2.1 Mathematical Model E=Pm Where: E———The difference of the combined nominal mass value between the displayed value of the school electronic scale and the standard weight of the M1 grade; P———represented by the school electronic scale Values; m --- M1 level standard weight combination of nominal quality electronic weighing devices have been increasingly involved in data processing and process control. Electronic platform scales, as a part of electronic weighing instruments, have become more and more widely used in trade and weighing places that often need to be moved, and the demand is also increasing. This has brought tremendous business opportunities to electronic scale manufacturers.

In order to obtain a higher market share, electronic platform scales not only have to work hard on product design, but also do a better job in terms of factory inspection. At present, China's small and medium-scale electronic weighing device manufacturers, the electronic scales factory inspection, still based on manual detection, there is a low efficiency, work intensity, vulnerable to human factors, data management capabilities and other shortcomings.

For this purpose, Jie Hui developed an automatic detection device that automatically detects and processes the performance indicators of electronic platform scales and uses database technology to manage data, effectively solving the problems of manual detection, and greatly improving the detection efficiency. And data management capabilities reduce labor costs while improving product quality. 1 hardware composition of automatic detection device [1] The automatic detection device is composed of PC, PLC control system, standard weight loading mechanism, position detection sensor, worktable mobile device, etc. The structure is shown in Figure 1. The PC is the control and management center of this system. It is responsible for sending commands to the electronic scales and the PLC control system, receiving the weight data sent from the electronic scales and the information returned by the PLC control system, and receiving the keyboard input information, such as the electronic platform scale number and model number. Specifications, job number, inspector, appearance inspection results.

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