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2. The logo of the electrical instrument

According to the national standards, the disk of the electrical instrument has the instrument model, the measurement object unit, the accuracy level, the type and number of the power supply, the use conditions, the accuracy, and the various rated values. Symbol representation. The symbol of the commonly used electrical instrument logo is shown in Table 1.4.

Sensor refers to the measurement that can be measured and converted into a device or device that can be converted into an available output signal in accordance with certain rules. It is usually composed of sensitive components and conversion components. There are many forms of the output signal of the sensor, such as voltage, current, frequency, pulse, etc. The form of the output signal is determined by the principle of the sensor.

Basic knowledge

1. The composition of the sensor

No matter what type of sensor, the components are basically the same. Generally consisting of sensitive components, conversion components, and conversion circuits, Figure 7.2 is shown in the frame diagram of the sensor.

① Sensitive components. A sensitive component is a component that directly feels the measurement of non -electrical volume and converts to other quantities (generally non -electrical) that determines the corresponding relationship with a certain law. If heating resistance, it can pre -convert temperature changes to the resistance of the resistance, and then convert to changes in voltage or current.

② Convert components. The conversion component is also called a converter, which is a component that converts the non -electrical volume felt by sensitive components directly into a electrical signal. Conversion components are the core of the sensor.

③ Convert circuit. Because the output signal of the sensor is generally weak, the signal conversion circuit requires an enlarged or converted to the electrical signal (such as voltage, current, or frequency, etc.) that facilitates transmission, processing, recording, displaying, and controlling. To convert circuits. Common signal conversion circuits include amplifiers, bridges, oscillators, etc.

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