Basic Knowledge of Digital Scales

Principle of Digital Scales

Digital scales are composed of electronic components such as load cell amplifier circuit, AD conversion circuit, microcontroller circuit, display circuit, keyboard circuit, communications interface circuits and regulated power supply circuit. When the object placed on the pan, the pressure is applied to the sensor, the sensor is deformed, so that the impedance changes, while using the excitation voltage is changed, a change in the analog signal output. The signal amplifier circuit output to an analog-to-digital converter. Convert to facilitate the processing of the digital signal output to the CPU arithmetic control. CPU keyboard commands and procedures such results are output to the display, until this result is shown.

Purchase and Use of Digital Gram Scale

First: Select the electronic balance should go up from the digital gram scale absolute precision (division value e) consider whether or not to comply with the weighing accuracy requirements. For example, in the practical work encountered such a situation, with a single the actual ruler indexing value d 1mg verification ruler indexing value e 10mg, use the largest weighing of 200g mettler to weigh the 7mg objects, so it cannot come up with accurate results. In the calibration test of digital scale we found that, on the first measurement test the error is larger, and the reasons are a considerable portion of the instrument is not calibrated in a longer time interval, and it is thought that the balance display zero position can be directly weighed.

Maintenance of Digital Scales

With the increasing automation of instrument, digital spoon scale has become increasingly widespread use in many industries. Electronic balance is easy to operate, but routine maintenance is also essential. During daily use, you have to pay attention to the following points: First, put the scale on a stable workbench, to avoid vibration, airflow and sunlight to prevent the erosion of corrosive gases. High-precision electronic balance to meet the specification requirements of the fluctuations in temperature and humidity conditions in order to achieve a predetermined weighing accuracy requirement.

Second, weighing volatile and corrosive materials in full bloom in a sealed container to prevent corrosion and damage electronic balance. Third, often manually correct the digital scale or do the automatic correction on a regular basis, so as to ensure it is in the best condition. Fourth, prevent overloading, pay attention to the known mass object should be less than the maximum load of the balance, electronic balance, most of them have protection device, and overloading may damage the balance!

This article is come from:http://www.mobilesaccessories.net/index.php/basic-knowledge-of-digital-scales.htm