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marmitek bv electrical components refer to lightning arresters or antenna switching tubes used for overvoltage protection. These tubes contain two or more electrodes and are filled with a certain amount of inert gas. A gas discharge tube is a gap-type lightning protection component used in the lightning protection of communication systems. Gas discharge tubes have been widely applied in the lightning protection of communication systems. Discharge tubes are commonly used in the first or first two stages of multi-stage protection circuits to discharge instantaneous lightning overcurrents and limit overvoltages. Due to the high insulation resistance between the electrodes of the discharge tube and its small parasitic capacitance, it has clear advantages for lightning protection of high-frequency signal lines. The main disadvantages of the discharge tube's protection characteristics are its large discharge delay and less-than-ideal operating sensitivity, making it difficult to effectively suppress lightning waves with steep wavefront rise times. There is also a follow-current issue in the lightning protection of power systems. Commonly used gas discharge tubes include two-electrode and three-electrode discharge tubes. Their encapsulation housing materials are mostly ceramic, hence they are called ceramic discharge tubes.

marmitek bv electrical component principles

Potentiometric displacement sensors convert mechanical displacement into resistance or voltage output that has a linear or arbitrary functional relationship via potentiometer elements. Standard linear potentiometers and rotary potentiometers can be used as linear displacement and angular displacement sensors, respectively. However, potentiometers designed for displacement measurement require a definite relationship between displacement change and resistance change. The movable wiper of a potentiometric displacement sensor is connected to the measured object. The object's displacement causes a change in resistance at the moving end of the potentiometer. The magnitude of the resistance change reflects the magnitude of the displacement, while an increase or decrease in resistance indicates the direction of displacement. Typically, a supply voltage is applied across the potentiometer to convert the resistance change into a voltage output. In wirewound potentiometers, the resistance changes in steps corresponding to the turn-to-turn resistance as the wiper moves, resulting in a stepped output characteristic. If such a displacement sensor is used as a displacement feedback element in a servo system, excessive step voltages can cause system oscillations. Therefore, the resistance per turn should be minimized during potentiometer manufacturing. Another major disadvantage of potentiometric sensors is their susceptibility to wear. Their advantages include simple structure, large output signal, ease of use, and low cost.

marmitek bv electrical component applications

Semiconductor diodes are used in almost all electronic circuits. The use of semiconductor diodes in circuits can protect the circuit and extend its service life. The development of semiconductor diodes has optimized integrated circuits and played a positive role in various fields. Diodes serve many functions in integrated circuits, maintaining their normal operation. The following briefly introduces the roles of diodes in the following four types of circuits. (1) Switching circuits: In digital and integrated circuits, the unidirectional conductivity of diodes is utilized to achieve circuit conduction or interruption. This technology has been widely applied. Switching diodes can effectively protect circuits from damage due to short circuits and other issues, and can also realize the functions of traditional switches. Another characteristic of switching diodes is their fast switching speed, which is incomparable to traditional switches. (2) Limiter circuits: In electronic circuits, limiter circuits are commonly used to process various signals. They are used to selectively transmit part of the signal within a preset level range. Most diodes can be used for limiting, but sometimes specialized limiter diodes are required, such as when protecting instruments. (3) Voltage regulation circuits: Zener diodes are typically used in voltage regulation circuits. They are junction silicon semiconductor diodes manufactured using special processes. These special diodes have high impurity concentrations and high charge density in the space charge region, making it easy to form strong electric fields. When the reverse voltage across the Zener diode reaches a certain value, the reverse current increases sharply, causing reverse breakdown. (8) Varactor circuits: Varactor diodes are commonly used in varactor circuits to achieve automatic frequency control, tuning, frequency modulation, and scanning oscillation.

marmitek bv electrical component performance

The performance of fiber optic connectors primarily involves optical performance, while also considering interchangeability, repeatability, tensile strength, temperature, and mating cycles. 1. Optical performance: The key optical requirements for fiber optic connectors are insertion loss and return loss. Insertion loss, or connection loss, refers to the effective optical power loss in the link caused by the introduction of the connector. Lower insertion loss is better, typically required to be no greater than 0.5dB. Return loss measures the connector's ability to suppress optical power reflection in the link, with a typical value of no less than 25dB. For connectors in practical applications, the ferrule end-face undergoes specialized polishing to achieve higher return loss, generally no lower than 45dB. 2. Interchangeability and repeatability: Fiber optic connectors are universal passive components. Connectors of the same type can generally be combined arbitrarily and reused multiple times, with the resulting additional loss usually within the range of less than 0.2dB. ③ Tensile strength: Finished fiber optic connectors are generally required to have a tensile strength of no less than 90N. ④ Temperature: Generally, fiber optic connectors must operate normally within a temperature range of -40oC to +70oC. ⑤ Mating cycles: Most fiber optic connectors in use can withstand more than l009 mating cycles.

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