How much do you know about the measurement and selection of resistance? Many people are not clear on this question. Because resistors are complex, different types of resistors have different characteristics and uses. So if you want to use resistance correctly, you have to know how to make appropriate measurements.
1: Resistance measurement method
Resistance measurement methods mainly include bridge method and voltammetry characteristic method. The former is the use of metal conductor under DC AC voltage, through the circuit wire current to reflect its length or area size; The latter is based on the volt effect of electronic components under the application of an applied electric field. Both of the above methods can be used to measure resistance. This is Analog Devices-Inc-ADUM1200UR-EP-RL7. However, due to the limitations of these two methods, they are not suitable for accurate measurement with high accuracy requirements in general. If more accurate measurements are needed, a more advanced method, the direct measurement method, should be used. This method first converts the resistance to be measured into the corresponding standard signals, and then calculates the size or mass of the resistance according to these signals.
2: Select the appropriate electronic components
In the choice of resistance, first of all to consider their own actual situation. If you just want to get a small peak current, make a resistor with iron cores and copper wire. If you want more power, you need to use silicon or other electronic components to make resistors. Also, note the difference between capacitors and inductors. Capacitors are devices used to store energy. They are usually small in size, light in weight and easy to install, so they are widely used. However, for some large equipment, it has certain security risks, so it should be carefully chosen. Finally, the choice should be made according to the specific situation. For example, if you want to improve impedance, you should choose high-density conductors or superconductor components;
3: Common resistance types and characteristics
Resistance is generally divided into two categories: conductor resistance and electromagnetic induction resistance. There are three common types of resistance, namely: 1. Metal conductor resistance; 2. Non-metallic conductor resistance; 3. Mixture resistance. These different kinds of resistors have specific characteristics, so the selection must be determined according to the actual situation. For metal conductor resistance, its main characteristics are large resistance value, good stability, and small loss. In addition, due to the strong conductivity of the metal, so usually requires a large current to make it react, which also puts forward certain requirements for the user. Nonmetallic conductors, on the other hand, have high resistance, but are easily damaged by impact. Therefore, in the process of use should try to avoid collision or stretching and other ways of operation.
What do you know about the classification of resistors? Finally, we divide resistance into three categories: normal resistance, high resistance, and low resistance. In general, resistors are easier to choose between three ranges. But if the accuracy is higher, it is best to use professional measuring instruments to complete. In a word, the measurement and selection of resistance is a university question, need to be carefully studied in order to accurately apply to the practice.