Method for reducing errors in design and production of electronic scales
Method for reducing error in design and production of electronic scales 1. Guarantee of sensor technical indicators Selecting various technical indicators to meet the accuracy requirements of the sensor is the key to ensure the quality of electronic scales. Linearity, creep, no-load temperature coefficient and sensitivity temperature coefficient are important indicators of the sensor. For each batch of sensors, sampling inspection and high and low temperature experiments must be carried out according to the sampling rate required by the relevant national standards.
2. The theoretical analysis and experimental analysis of the temperature coefficient of the electronic scale circuit prove that the input resistance and the temperature coefficient of the feedback resistor are important factors affecting the sensitivity temperature coefficient of the electronic scale. It is necessary to select a metal film resistor with a temperature coefficient of 5×10-6. High temperature testing must be performed for each electronic scale produced. For some products with a small temperature difference, the product can be compensated with a metal film resistor with a temperature coefficient of less than 25×10-6. At the same time of high temperature test, the product is temperature aging, which improves the stability of the product.
3. Nonlinear Compensation of Electronic Scales Ideally, the digital quantity of the electronic scale after analog-to-digital conversion should be linear with the weight applied to the electronic scale. The accuracy is calibrated during the production process and the internal computer program is used for single point calibration. The slope of the number and weight is calculated according to the ideal straight line and stored in the memory. This does not overcome the nonlinearity errors produced by the sensor and integrator. With multi-point correction, using multiple lines to approximate a curve effectively reduces nonlinear errors without increasing hardware costs. For example, a 1/3000-accuracy electronic scale uses a 3-point calibration, and a 1/5000-accuracy electronic scale uses a 5-point calibration.
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This article label: electronic scale forklift scale electronic platform scale electronic platform scale electronic table scale
2. The theoretical analysis and experimental analysis of the temperature coefficient of the electronic scale circuit prove that the input resistance and the temperature coefficient of the feedback resistor are important factors affecting the sensitivity temperature coefficient of the electronic scale. It is necessary to select a metal film resistor with a temperature coefficient of 5×10-6. High temperature testing must be performed for each electronic scale produced. For some products with a small temperature difference, the product can be compensated with a metal film resistor with a temperature coefficient of less than 25×10-6. At the same time of high temperature test, the product is temperature aging, which improves the stability of the product.
3. Nonlinear Compensation of Electronic Scales Ideally, the digital quantity of the electronic scale after analog-to-digital conversion should be linear with the weight applied to the electronic scale. The accuracy is calibrated during the production process and the internal computer program is used for single point calibration. The slope of the number and weight is calculated according to the ideal straight line and stored in the memory. This does not overcome the nonlinearity errors produced by the sensor and integrator. With multi-point correction, using multiple lines to approximate a curve effectively reduces nonlinear errors without increasing hardware costs. For example, a 1/3000-accuracy electronic scale uses a 3-point calibration, and a 1/5000-accuracy electronic scale uses a 5-point calibration.
Thank you very much for your interest in our products. If you are interested in this electronic scale or have questions, please click on the online customer on the right side of the page, or call us to believe: with your suggestions and help, we will do better!
-- Responsible Editor: Yajin Electronics - Business Raindrops Copyright Notice: The copyright of this article belongs to Shanghai Yajin Electronics (http://). Please indicate the source.
This article label: electronic scale forklift scale electronic platform scale electronic platform scale electronic table scale
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