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brand-rex electrical components refer to all single components based on semiconductor materials, including diodes, transistors, field-effect transistors, and thyristors made from various semiconductor materials (the latter three are all three-terminal devices). A transistor is a semiconductor device commonly used in amplifiers or electronically controlled switches. Transistors are the basic building blocks for the proper operation of computers, mobile phones, and all other modern electronic circuits. Due to their fast response speed and high accuracy, transistors can be used for a wide variety of digital and analog functions, including amplification, switching, voltage regulation, signal modulation, and oscillation. Transistors can be packaged individually or as part of an integrated circuit in a very small area that can accommodate one hundred million or more transistors.

brand-rex electrical component characteristics

The static characteristics of a sensor refer to the relationship between the output and input quantities for a static input signal. Since the input and output quantities are independent of time in this case, their relationship, i.e., the static characteristics of the sensor, can be described by an algebraic equation without time variables, or by a characteristic curve plotted with the input quantity as the abscissa and the corresponding output quantity as the ordinate. The main parameters characterizing the static characteristics of a sensor include: linearity, sensitivity, hysteresis, repeatability, drift, etc. (1) Linearity: Refers to the degree to which the actual relationship curve between the sensor output and input deviates from the fitted straight line. It is defined as the ratio of the maximum deviation between the actual characteristic curve and the fitted straight line over the full scale range to the full-scale output value. (2) Sensitivity: Sensitivity is an important indicator of the static characteristics of a sensor. It is defined as the ratio of the increment in the output quantity to the corresponding increment in the input quantity that causes this change. Use S to represent sensitivity. (3) Hysteresis: Hysteresis is the phenomenon where the input-output characteristic curves do not coincide when the input quantity changes from small to large (forward stroke) and from large to small (reverse stroke). For the same magnitude of input signal, the output signals for the forward and reverse strokes of the sensor are not equal; this difference is called the hysteresis difference. (4) Repeatability: Repeatability refers to the degree of inconsistency in the characteristic curves obtained when the sensor input changes continuously multiple times over the full scale in the same direction. (5) Drift: Sensor drift refers to the phenomenon where the sensor output changes over time while the input remains constant. There are two main causes of drift: one is the sensor's own structural parameters; the other is the surrounding environment (such as temperature, humidity, etc.). (6) Resolution: When the sensor input increases slowly from a non-zero value, an observable change in the output occurs after exceeding a certain increment; this input increment is called the sensor's resolution, i.e., the minimum input increment. (7) Threshold: When the sensor input increases slowly from zero, an observable change in the output occurs after reaching a certain value; this input value is called the sensor's threshold voltage.

brand-rex electrical component features

Among various types of switches, there is a component with the ability to "sense" objects approaching it—the displacement sensor. Using the sensitivity of the displacement sensor to approaching objects to control the opening or closing of a switch is known as a proximity switch. When an object moves toward the proximity switch and approaches within a certain distance, the displacement sensor "senses" it, and the switch activates. This distance is usually called the "detection distance." Different proximity switches have different detection distances. Sometimes, the detected objects move toward the proximity switch one by one at certain time intervals and then leave one by one, repeating this process continuously. Different proximity switches have different response capabilities to the detection objects. This response characteristic is called the "response frequency."

brand-rex electrical component types

Commonly used thermocouples can be divided into two categories: standard thermocouples and non-standard thermocouples. Standard thermocouples refer to those for which national standards specify the relationship between thermoelectric potential and temperature, allowable errors, and have a unified standard division table; they have matching display instruments available for selection. Non-standardized thermocouples are inferior to standardized thermocouples in terms of usage range or magnitude, generally lack a unified division table, and are mainly used for measurements in certain special occasions. Theoretically, any two different conductors (or semiconductors) can be paired to form a thermocouple, but as a practical temperature-measuring component, it has multiple requirements. To ensure reliability in engineering technology and sufficient measurement accuracy, not all materials can form thermocouples. The basic requirements for thermocouple electrode materials are generally: 1 Within the temperature measurement range, the thermoelectric properties are stable, do not change over time, have sufficient physical and chemical stability, and are not easily oxidized or corroded; 2 Small resistance temperature coefficient, high conductivity, and low specific heat; 3 The thermoelectric potential generated during temperature measurement must be large, and the relationship between thermoelectric potential and temperature should be linear or close to a linear single-valued function; 14 Good material reproducibility, high mechanical strength, simple manufacturing process, and low cost.

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