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In fact, it is generally referred to as a balance, but an analytical balance refers to a balance with an accuracy of 0.1 mg. The general meaning of the balance is relatively broad. What is the difference between a specific analysis balance and an electronic balance? What is the specific accuracy, from the following details:
Analytical balances are high-accuracy balances used for chemical analysis and precise measurement of substances. In most cases, the minimum division of these balances is less than 10-5 of the maximum capacity. Analytical balances can be divided into constant balances (weighing and minimum graduation values are 100-200g and 0.01-1mg respectively), semi-micro balances (30-100g and 1-10μg), micro balances ( 3~30g and 0.1~1μg) and ultra-micro balance (3~5g and 0.1μg or less).
Electronic balance is a comprehensive product of the development of sensing technology, analog electronic technology, digital electronic technology and microprocessor technology. It has automatic calibration, automatic display, tare weight removal, automatic data output, automatic fault tracing, overload protection, etc. Function. Electronic balances usually use electromagnetic force sensors (see load cells) to form a closed-loop automatic adjustment system with high accuracy and good stability. The working principle of the electronic balance is shown in Figure 5. When the object to be weighed is added to the weighing pan, the position detector signal of the sensor changes, and the current in the sensor coil increases through the feedback of the amplifier, and the current generates a feedback force in a constant magnetic field to balance the applied load; At the same time, the voltage value of the current on the measuring resistance Rm is sent to the microprocessor through a filter and an analog/digital converter for data processing, and finally the display automatically displays the value of the material being weighed.
