China Education Equipment Purchasing Network News: There are so many types of electronic balances on the market today, which is dazzling. But whether it is domestic or imported, what kind of style is not the same, and regardless of the accuracy and quality, the basic structure is the same, which is composed of weighing pan, sensor, position detector, PID regulator, power amplifier, Low-pass filter, analog-to-digital converter, microcomputer, display, chassis, feet and other parts, let's take a closer look below.

(1) Weighing pan

The weighing pan is mostly made of metal material, which is installed on the balance's sensor and is the bearing device of the balance for weighing. It has a certain geometric shape and thickness, mostly round and square. Pay attention to sanitation and cleanness during use, not to change the weighing pan at will.

(2) Sensor

The sensor is one of the key components of the electronic balance. It is composed of the shell, magnetic steel, pole shoes and coils, etc., and is installed under the weighing pan. Its accuracy is very high and sensitive. The weighing chamber of the balance should be kept clean, and it should be avoided that items are scattered during weighing and affect the normal operation of the sensor.

(3) Position detector

The position detector is composed of a high-sensitivity far-infrared light-emitting tube and a symmetrical photosensitive cell. Its role is to convert the load on the weighing pan into an electrical signal output.

(4) PID regulator

The role of PID (proportional, integral, derivative) regulator is to ensure that the sensor works quickly and steadily.

(5) Power amplifier

Its role is to amplify the weak signal to ensure the accuracy and working requirements of the balance.

(6) Low-pass filter

Its role is to eliminate the interference of high frequency signals generated by the outside world and certain electrical components to ensure that the output of the sensor is a constant DC voltage.

(7) Analog-to-digital (A / D) converter

It has the advantages of high conversion accuracy and easy automatic zero adjustment, which can effectively eliminate interference and convert the input signal into a digital signal.

(8) Microcomputer

This component can be said to be the key component of the Shanghai electronic balance. It is the data processing component of the electronic balance. It has functions such as memory, calculation, and table lookup.

(9) Display

There are basically two kinds of monitors at present: one is a digital tube display; the other is a liquid crystal display. Their function is to display the output digital signal on the display screen.

(10) Case

Its function is to protect the electronic balance from dust and other substances, and it is also the base of electronic components.

(11) Foot

The supporting part of the electronic balance is also an adjusting part of the level of the electronic balance, generally relying on the two rear adjusting feet to adjust the level of the balance.

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