ELEKTROBOCK electrical components Germany ELEKTROBOCK model ELEKTROBOCK price

ELEKTROBOCK electrical components are indispensable measuring instruments for departments such as power electronics, generally with the main purpose of measuring voltage, current, and resistance. Multimeters are divided into analog multimeters and digital multimeters according to the display method. It is a multi-function, multi-range measuring instrument. General multimeters can measure DC current, DC voltage, AC current, AC voltage, resistance, and audio levels. Some can also measure AC current, capacitance, inductance, and some semiconductor parameters (such as β). A multimeter is a magnetoelectric instrument with a rectifier that can measure various electrical parameters such as AC/DC current, voltage, and resistance. For each electrical quantity, there are generally several ranges. Also known as a multi-meter or simply multi-meter. A multimeter consists of a magnetoelectric ammeter (meter head), measuring circuit, and selector switch. Through the switching of the selector switch, various electrical parameters can be measured conveniently. The main basis for its circuit calculation is Ohm's law for closed circuits. There are many types of multimeters, which should be selected according to different requirements during use.

ELEKTROBOCK electrical component characteristics

(1) has a wide transient response range and strong harmonic measurement capability. The quality of transient characteristics is an important parameter for judging whether a transformer can be applied in a power system, especially in coordination with relay protection operating time. Traditional electromagnetic transformers have poor response characteristics to high-frequency signals due to the presence of an iron core and cannot correctly reflect the transient process on the primary side. The frequency range of optical current transformers is mainly determined by the electronic circuit part, without the problem of iron core saturation, so it can accurately reflect the transient process on the primary side. The structure of optical sensors can measure harmonics on high-voltage power lines, which is difficult for electromagnetic induction transformers to achieve. (2) Digital interface with strong communication capability. Since the optical sensor transmits optical digital signals, it is easy to interface with communication networks, and there is no measurement error during transmission. At the same time, with the widespread adoption of microprocessor-based protection and control equipment, optical current transformers can directly provide digital quantities to secondary equipment, thereby eliminating the converters and A/D sampling parts in the original protection devices, greatly simplifying secondary equipment and promoting research on new protection principles. (3) Small size, light weight, and easy to upgrade, meeting the requirements for miniaturization and compactness of substations. Since optical sensors rely on sensor heads and electronic circuits for signal acquisition and processing, they are small in size, with a weight generally below 1003 kg, making them easy to integrate into AIS or GIS, thus greatly reducing the floor area of substations and meeting the requirements for miniaturization and compactness. At the same time, optical current transformers connect to secondary equipment via a small number of optical fibers, significantly reducing cable trenches and cables.

ELEKTROBOCK electrical component characteristics

The characteristics of an inductor are exactly opposite to those of a capacitor; it has the characteristic of blocking AC while allowing DC to pass smoothly. The resistance when a DC signal passes through the coil is just the resistance of the wire itself, resulting in a very small voltage drop; when an AC signal passes through the coil, a self-induced electromotive force is generated at both ends of the coil. The direction of the self-induced electromotive force is opposite to that of the applied voltage, hindering the passage of AC. Therefore, the characteristic of an inductor is to pass DC and block AC; the higher the frequency, the greater the coil impedance. Inductors often work together with capacitors in circuits to form LC filters, LC oscillators, etc. In addition, people utilize the characteristics of inductance to manufacture chokes, transformers, relays, etc. Passing DC: refers to the inductor presenting a conductive state to DC. If the resistance of the inductor coil is ignored, DC can pass through the inductor "unimpeded." For DC, the coil's own resistance has very little hindering effect, so it is often ignored in circuit analysis. Blocking AC: When AC passes through the inductor coil, the inductor presents a hindering effect to the AC. What hinders the AC is the inductive reactance of the coil.

ELEKTROBOCK electrical component types

1. A rotating thermometer is made of a coiled bimetallic strip. One end of the bimetallic strip is fixed, and the other end is connected to a pointer. Due to different expansion rates of the two metal strips, the degree of coiling varies at different temperatures, causing the pointer to point to different positions on the dial. The temperature can be known from the reading on the dial. 2. The resistance change of a semiconductor thermometer is different from that of metals; as the temperature rises, its resistance decreases, and the magnitude of change is large. Therefore, even a small temperature change can cause a significant change in resistance, resulting in thermometers with high precision, often called thermal sensors. 3. A thermocouple thermometer consists of two different metals connected to a sensitive voltmeter. At different temperatures, the metal junctions produce different potential differences at the two ends of the metals. The potential difference is very small, so a sensitive voltmeter is required to measure it. The temperature can be determined from the voltmeter reading. 4. Optical pyrometer: When an object's temperature is high enough to emit a large amount of visible light, its temperature can be determined by measuring the amount of thermal radiation. This type of thermometer is an optical pyrometer. This thermometer is mainly composed of a telescope equipped with a red filter and a circuit with a small bulb, galvanometer, and variable resistor. Before use, establish the relationship between the temperature corresponding to different filament brightness levels and the readings on the galvanometer. During use, align the telescope with the object to be measured, adjust the resistor so that the bulb's brightness matches that of the object, and then read the object's temperature from the galvanometer. 5. Liquid crystal thermometers made with different formulas have different phase transition temperatures. When they undergo phase transition, their optical properties change, causing the liquid crystal to appear to change color. If liquid crystals with different phase transition temperatures are coated on a piece of paper, the temperature can be determined by the color change of the liquid crystal. The advantage of this thermometer is easy reading, while the disadvantage is insufficient precision. It is commonly used in ornamental fish tanks to indicate water temperature. 6. A digital thermometer uses a temperature sensor to convert (temperature) into a digital signal, and then displays the temperature in digital form through a display (such as LCD, digital tube, LED matrix, etc.). It can quickly and accurately measure the maximum human body temperature. Compared with traditional mercury thermometers, it has advantages such as convenient digital reading, short measurement time, high measurement accuracy, memory function, and audible alerts. Especially, digital thermometers do not contain mercury, are harmless to the human body and the surrounding environment, and are particularly suitable for use in hospitals and homes.

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