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3SU14011BB203AA0 electrical components are tools for accurately determining and measuring temperature, categorized into pointer thermometers and digital thermometers. Depending on the temperature-sensing substance and measurement range, types include kerosene thermometers, alcohol thermometers, mercury thermometers, gas thermometers, resistance thermometers, thermocouple thermometers, radiation thermometers, optical pyrometers, and bimetallic thermometers. Digital thermometers accurately determine and measure temperature, displaying results numerically rather than via a pointer or mercury column. Hence, they are called digital thermometers or digital temperature gauges.

3SU14011BB203AA0 electrical component operating principle

The absorption film irradiated by infrared rays is a thin film with low heat capacity, allowing its temperature to rise easily. A cavity structure is located directly beneath the center of the substrate, ensuring a temperature difference between the cold junction and the measuring junction. The thermocouples consist of polysilicon and aluminum connected in series. When the temperature at the measuring junction of each thermocouple rises, a thermoelectromotive force Vn is generated between the thermocouples, so the sum of their voltages can be obtained at the output terminal.

3SU14011BB203AA0 electrical component composition

A multimeter consists of three main components: the meter head, the measurement circuit, and the selector switch. It is the most basic tool in the field of electronic testing and a widely used test instrument. A multimeter is also called a multi-meter, a triple-meter (A, V, Ω, i.e., for current, voltage, and resistance), a multiplexing meter, or a universal meter. Multimeters are categorized into analog (pointer-type) multimeters and digital multimeters. There is also an oscilloscope multimeter with oscilloscope functionality, which is a multi-function, multi-range measuring instrument. General multimeters can measure DC current, DC voltage, AC voltage, resistance, and audio levels. Some models can also measure AC current, capacitance, inductance, temperature, and certain parameters of semiconductors (diodes, transistors). Digital multimeters have become the mainstream and have replaced analog instruments. Compared with analog instruments, digital instruments offer higher sensitivity, higher accuracy, clearer display, stronger overload capacity, portability, and easier, simpler operation.

3SU14011BB203AA0 electrical component operating principle

A varactor diode is a special type of diode. When forward bias is applied, a large current flows, the PN (positive-negative) junction depletion region narrows, capacitance increases, and a diffusion capacitance effect is produced. When reverse bias is applied, a transition capacitance effect occurs. However, since forward bias causes leakage current, reverse bias is typically applied in applications. Varactor diodes, also known as voltage-controlled capacitors, are semiconductors whose junction capacitance changes with the applied voltage. In other words, as variable capacitors, they can be used in resonant circuits such as FM tuners and TV tuners, as well as in FM modulation circuits. Essentially, it can be viewed as a PN junction. If a reverse voltage V is applied to the PN junction (since varactor diodes are used in reverse bias), electrons in the N-type semiconductor are drawn toward the positive electrode, and holes in the P-type semiconductor are drawn toward the negative electrode, forming a depletion layer devoid of electrons and holes. Let the width of this depletion layer be d, which varies with the reverse voltage V. Thus, as the reverse voltage V increases, the depletion layer d widens, and the diode's capacitance C decreases (according to C=kS/d). Conversely, as the reverse voltage decreases, the depletion layer width d narrows, and the diode's capacitance increases. Changes in the reverse voltage V cause changes in the depletion layer, thereby altering the junction capacitance C of the voltage-controlled capacitor, achieving the desired effect. Varactor diodes are semiconductor devices made based on the principle of variable capacitance across the PN junction, used as variable capacitors in high-frequency tuning, communication, and other circuits. Varactor diodes come in various package types, including glass encapsulation (glass-sealed), plastic encapsulation (plastic-sealed), metal casing encapsulation (metal-sealed), and leadless surface-mount packages. Typically, low-to-medium power varactor diodes use glass, plastic, or surface-mount packaging, while higher-power varactor diodes mostly use metal sealing. Common varactor diode parameters.

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