celsa electrical components Germany celsa models celsa prices

celsa electrical components are parts that connect batteries to external conductors. In electrical engineering, terminals mostly refer to wiring ends, also called terminal blocks. Types include single-hole, double-hole, socket, hook, etc. By material, they are classified as silver-plated copper, galvanized copper, copper, aluminum, iron, etc. Their main function is to transmit electrical signals or conduct electricity. In engineering, they are interfaces reserved by pre-station works for post-station works, and are embedded facilities for post-station interface engineering. When observing objects with a terminal cross-section inspection microscope, it can produce an upright three-dimensional spatial image with strong stereoscopic effect, clear and wide imaging, and a long working distance; equipped with a high-precision harness terminal image measurement and analysis system, combined into a harness terminal inspection microscope, the perfect combination of a high-quality optical system and a high-resolution camera makes cross-section images clearer, and unique fixed magnification and grading make measurements more precise. To detect whether terminals are crimped well, professional testing equipment is required. Commonly used terminal testing equipment includes: terminal cross-section analyzers.

celsa electrical component principles

When two different conductors or semiconductors A and B form a loop with their ends connected, as long as the temperatures at the two junctions are different, with one end at temperature T, called the working end or hot end, and the other end at temperature T0, called the free end or cold end, an electromotive force (EMF) will be generated in the loop. The direction and magnitude of this EMF depend on the materials of the conductors and the temperatures of the two junctions. This phenomenon is called the "thermoelectric effect," the loop formed by the two conductors is called a "thermocouple," these two conductors are called "thermoelectrodes," and the generated EMF is called "thermo-EMF." Thermo-EMF consists of two parts: the contact EMF of the two conductors and the temperature difference EMF of a single conductor. The magnitude of the thermo-EMF in a thermocouple loop depends only on the conductor materials forming the thermocouple and the temperatures of the two junctions, and is independent of the shape and size of the thermocouple. When the materials of the two thermocouple electrodes are fixed, the thermo-EMF is the functional difference between the temperatures t and t0 of the two junctions. This relationship is widely applied in practical temperature measurement. Since the cold end t0 is constant, the thermo-EMF generated by the thermocouple changes only with the temperature of the hot end (measurement end), meaning a specific thermo-EMF corresponds to a specific temperature. We can achieve temperature measurement by measuring the thermo-EMF. The basic principle of thermocouple temperature measurement is that two conductors of different compositions form a closed loop; when there is a temperature gradient between the two ends, current flows through the loop, creating an EMF—thermo-EMF—between the two ends, known as the Seebeck effect. Two homogeneous conductors of different compositions serve as thermoelectrodes, the higher temperature end is the working end, and the lower temperature end is the free end, which is usually kept at a constant temperature. Based on the functional relationship between thermo-EMF and temperature, thermocouple division tables are created; these tables are obtained under the condition that the free end temperature is 10 °C, and different thermocouples have different division tables. When a third metal material is introduced into the thermocouple loop, as long as the temperatures at the two junctions of this material are the same, the thermo-EMF generated by the thermocouple remains unchanged, i.e., it is not affected by the introduction of the third metal. Therefore, during thermocouple temperature measurement, measuring instruments can be connected to measure the thermo-EMF, thereby determining the temperature of the measured medium. Thermocouple temperature measurement requires the cold end temperature (the measurement end is the hot end, and the end connected to the measurement circuit via lead wires is called the cold end) to remain constant so that the thermo-EMF magnitude has a certain proportional relationship with the measured temperature. If the cold end (ambient) temperature changes during measurement, it will seriously affect measurement accuracy. Taking measures at the cold end to compensate for the impact of cold end temperature changes is called thermocouple cold end compensation. Special compensation wires are used to connect to measuring instruments. Thermocouple cold end compensation calculation methods: (1) From millivolts to temperature: Measure the cold end temperature, convert it to the corresponding millivolt value, add it to the thermocouple's millivolt value, and convert to temperature; (2) From temperature to millivolts: Measure the actual temperature and cold end temperature, convert them separately to millivolt values, subtract to obtain the millivolt value, and thus determine the temperature.

celsa electrical component characteristics

Sensitivity refers to the ratio of the change in output to the change in input of a sensor under steady-state operating conditions. It is the slope of the output-input characteristic curve. If the relationship between the sensor's output and input is linear, then sensitivity S is a constant. Otherwise, it will vary with changes in the input. The dimension of sensitivity is the ratio of the dimensions of the output and input quantities. When the dimensions of the sensor's output and input quantities are the same, sensitivity can be understood as the amplification factor. Increasing sensitivity can yield higher measurement precision. However, the higher the sensitivity, the narrower the measurement range, and stability often deteriorates.

celsa electrical component structure

1. The cathode of an electron tube is the component used to emit electrons, divided into oxide cathodes and thoriated tungsten carbide cathodes. Generally, oxide cathodes are indirectly heated; they use a dedicated filament to heat the cathode body coated with barium oxide, etc., for thermionic emission. Thoriated tungsten carbide cathodes are generally directly heated; thermionic emission is produced simply by heating, so they serve as both filament and cathode. Theoretically, thoriated tungsten carbide cathodes have a much longer lifespan than oxide cathodes. Thoriated tungsten carbide cathodes are most widely used in high-power transmitter tubes, while oxide cathodes are generally used in transmitter tubes with output power below 1kW. Mesh cathodes are made into cylindrical shapes using thinner thoriated tungsten wires, with advantages including: (1) Because they are woven from many thoriated tungsten wires, they have a larger permeance coefficient. (2) It is easier to achieve small cathode-grid spacing, which helps improve transconductance. (3) Due to the mesh structure of the filament, the current in each single filament is small, the local magnetic field is weak, and thus the AC hum generated by the cathode current is also small. 2. The grids of electron tubes are divided into first grid and second grid based on their roles in the tube, sometimes also called control grid and screen grid. The main role of the first grid is to control cathode current, while the role of the second grid is to shield the first grid from the influence of the plate. Grid structure relates to its own mechanical strength and heat dissipation effectiveness, affecting whether the tube can work stably. To reduce electron transit time, the grid-cathode spacing is made very short, even less than 1mm, so manufacturers often use materials with high mechanical strength, high thermal conductivity, good radiation coefficient, and high melting point to make grids, to avoid thermal shorting at such small spacings. The first and second grids must be strictly aligned, so that the screen grid captures fewer electrons, reducing screen grid dissipation, improving current distribution and linearity. 3. The anode of an electron tube is the electrode that collects most of the electrons emitted by the cathode. During operation, due to electron bombardment of the plate surface and thermal radiation from other electrodes, a large amount of heat energy is generated at the plate. Since the plate's dissipation power density is tens to hundreds of watts per square centimeter, natural radiation or conduction cooling is insufficient for such high power densities. Therefore, forced cooling methods must be used. Common methods include air cooling, water cooling, and evaporative cooling.

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