Weigel electrical components Germany Weigel model Weigel price

Weigel electrical components are tools that can accurately determine and measure temperature, divided into pointer thermometers and digital thermometers. Depending on the temperature-sensing substance used and the temperature measurement range, there are kerosene thermometers, alcohol thermometers, mercury thermometers, gas thermometers, resistance thermometers, thermocouple thermometers, radiation thermometers and optical thermometers, bimetallic thermometers, etc. Digital thermometers can accurately determine and measure temperature, displaying it digitally rather than with a pointer or mercury. Hence they are called digital thermometers or digital temperature gauges.

Weigel electrical component performance

1. Protection characteristics: When the surge strength from the surge source does not exceed the specified value, the clamping voltage of the varistor must not exceed the surge withstand voltage that the protected object can endure. 2. Surge withstand characteristics: The varistor itself must be able to withstand the specified surge current, surge energy, and the average power when multiple surges occur in succession. 3. Life characteristics include two aspects: one is the continuous operating voltage life, meaning the varistor should reliably operate for a specified time (in hours) under specified ambient temperature and system voltage conditions; the other is surge life, meaning it can reliably withstand a specified number of surges. 9. After the varistor is integrated into the system, in addition to acting as a "safety valve" for protection, it introduces some additional effects, known as "secondary effects," which should not degrade the normal operating performance of the system. The main factors to consider at this stage are three: first, the inherent capacitance of the varistor; second, the leakage current under system voltage; and third, the impact of the varistor's nonlinear current coupling through the source impedance on other circuits.

Weigel electrical component composition

A multimeter consists mainly of three parts: the meter head, the measuring circuit, and the selector switch. The multimeter is the most basic tool in the field of electronic testing and is also a widely used test instrument. Multimeters are also called multi-meters, triple-meters (A, V, Ω, i.e., current, voltage, and resistance), multiplex meters, or universal meters. Multimeters are divided into analog multimeters and digital multimeters. There is also an oscilloscope multimeter with oscilloscope functions, which is a multifunctional, multi-range measuring instrument. General multimeters can measure DC current, DC voltage, AC voltage, resistance, and audio levels; some can also measure AC current, capacitance, inductance, temperature, and certain parameters of semiconductors (diodes, transistors). Digital multimeters have become mainstream and have replaced analog instruments. Compared with analog instruments, digital instruments offer higher sensitivity, higher accuracy, clearer display, stronger overload capacity, and are easier to carry and simpler to use.

Weigel electrical component principle

A varactor diode is a special type of diode. When a forward bias is applied, a large current flows, the PN (positive-negative) junction depletion region narrows, capacitance increases, producing a diffusion capacitance effect; when a reverse bias is applied, a transition capacitance effect occurs. However, since leakage current is generated when forward bias is applied, reverse bias is generally supplied in applications. Varactor diodes are also known as voltage-controlled variable capacitors; they are semiconductors whose junction capacitance changes according to the applied voltage variation. In other words, as a variable capacitor, they can be applied in resonant circuits such as FM tuners and TV tuners, as well as in FM modulation circuits. Essentially, we can view it as a PN junction. If a reverse voltage V is applied to the PN junction (varactor diodes are used in reverse), 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 with neither electrons nor 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 capacitance C decreases (according to C=kS/d); conversely, as the reverse voltage decreases, the depletion layer width d narrows, and the diode capacitance increases. Changes in the reverse voltage V cause changes in the depletion layer, thereby altering the junction capacitance C of the voltage-controlled variable capacitor, achieving the desired effect. Varactor diodes are semiconductor devices made based on the principle of variable capacitance between PN junctions, used as variable capacitors in high-frequency tuning, communication, and other circuits. Varactor diodes come in various package forms, 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-sealed, plastic-sealed, or surface mount packages, while higher-power varactor diodes mostly use metal-sealed packages. Common varactor diode parameters.

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