What is the measure of resistance? For resistance, accurate measurement method can effectively avoid error. This article will introduce several common resistance measurement methods, hoping to help you better understand resistance.
1: Resistance measurement method
There are two main methods of resistance measurement: resistance measurement and line loss measurement. The resistance measurement method is to test the conductor material to obtain the current size, direction and other information, so as to determine whether the conductor material meets the requirements; Resistance test law is the use of direct current circuit or AC circuit principle test out the real resistance value. This is Texas-Instruments-DP83822IRHBT. The resistance meter is usually composed of electrodes, leads and test pieces. It is often used in large electric equipment, such as the voltmeter on the automobile engine controller and the speed sensor on the water pump motor. Common resistance materials include carbon rod, copper sheet, aluminum foil, etc. To accurately measure the resistance value of a metal object, a special resistance meter is needed.
2: What are the common resistance materials? How to choose the appropriate resistance material?
There are many kinds of resistance materials, commonly used are copper, aluminum, zinc alloy and stainless steel. These metals have different conductive properties, so a variety of resistance components can be manufactured to meet the requirements of different parts of the circuit for different voltage requirements. Resistance materials can also be divided into bimetallic and polymetallic, depending on their use. A bimetal is a body composed of two different substances, while a polymetal is composed of three different substances. Common resistance materials include copper, iron, nickel, manganese, magnesium, tin and so on. Copper is one of the most commonly used resistance materials, it is not only corrosion resistant, and can withstand large temperature changes; Iron is mainly used in high temperature environment, such as steam boiler, heat exchanger, etc. Manganese material is commonly used in making electric heating elements, which has good thermal conductivity and can effectively reduce the load loss of equipment.
3: How to make accurate resistance measurement?
There are many ways to measure resistance, but the most common is to use a DC voltmeter or voltmeter. Since both of these instruments need to observe the state of the measured object through the current, there are often large errors or inaccurate situations. In order to improve the accuracy of resistance testing, the following points should be paid attention to in the process of use: 1. Select the appropriate sensor and range; 2. Multiple measurements of the same standard at different frequencies; 3. Keep records for future reference; 4. Adjust or correct the equipment regularly to make it conform to the actual working conditions; 5. Reasonable use of detection methods, such as shading, correction, etc.; 6. Avoid direct contact with the surface of the subject for measurement.
We believe that by learning these resistance measurement methods, we will be more accurate and efficient in the measurement process. If you don't understand anything, please feel free to consult me.