DC resistance tester is a high-precision and wide range resistance measurement device widely used in multiple industries such as power, automotive, and electronics. The following is a detailed introduction about the DC resistance tester:
1. Product Overview
DC resistance tester (also known as micro ohmmeter, DC resistance meter, etc.) is a high-precision replacement product for traditional DC single and double arm bridge. It adopts advanced switching power supply technology and high-speed microcontroller, with built-in rechargeable battery and charging circuit, and has the characteristics of fast measurement, easy use, and high measurement accuracy. The DC resistance tester is capable of testing resistance values ranging from micro ohms to several megaohms, making it an ideal device for measuring the DC resistance of transformer windings and high-power inductive equipment.
2. Working principle
The working principle of a DC resistance tester is based on Ohm's law, which states that the relationship between voltage (V) and current (I) is V=IR, where R is the resistance. The tester calculates the resistance value by applying a constant DC current to the tested resistor and measuring the resulting voltage drop. The tester contains a stable current source, a precise voltage measurement circuit, and a built-in signal processor to ensure the accuracy and stability of the measurement results.
3. Main features
① High precision: Using high-speed A/D converters and programmable current source technology, the measurement data is stable and has good repeatability.
② Wide range: capable of testing resistors ranging from 1 μ Ω to 3M Ω, meeting different testing requirements.
③ High degree of automation: automatically completes functions such as stable current judgment, data acquisition, data processing, resistance display, and printing.
④ Intuitive display: Adopting a dot matrix LCD screen, it overcomes the disadvantage of LED display values being difficult to read under sunlight.
⑤ Strong anti-interference ability: equipped with automatic arc suppression function and comprehensive protection measures to ensure stable and reliable measurement data.
⑥ Portability: The instrument is small in size, light in weight, equipped with a rechargeable battery pack, and can be used for both AC and DC, making it convenient for on-site and field testing.
4. Application scenarios
The DC resistance tester is mainly used in the power industry to measure the DC resistance of electrical equipment such as transmission lines, substation equipment, and motors. By regularly inspecting and troubleshooting these devices, the stable operation of the power system can be ensured. In addition, DC resistance testers are widely used in the battery management system and charging facilities of electric vehicles in the automotive industry, helping car manufacturers and users to timely understand the health status and safety of batteries. In the production and quality control process of electronic products, DC resistance testers also play an important role in detecting the resistance values of electronic devices such as transistors and integrated circuits, ensuring product quality and reliability.
5. Usage method
When using a DC resistance tester, the first step is to reliably connect the power and ground wires to the tester, and connect the test wires to the input and output terminals on the tester panel that correspond to their colors. Then select the appropriate measurement current and measurement method, and press the "Measure" button to start the measurement. During the measurement process, the tester will display a charging progress bar and the current value. When the current reaches the rated value, the tester will sample and calculate the data and display the measurement results. After the measurement is completed, you can choose to store or print the measurement data.
6. Precautions
After measuring the inductive load, the test line cannot be directly removed to avoid endangering the safety of testing personnel and equipment due to inductive discharge.
For no-load tap changers, it is not allowed to switch tap changers during the measurement process.
If the power suddenly loses during the measurement process, the tester will automatically start discharging. Please do not immediately remove the wiring, wait at least 30 seconds before removing the wiring.
When measuring, do not short-circuit other untested windings to ground, otherwise it will slow down the transformer magnetization process and prolong the data stability time.
In summary, the DC resistance tester is a high-precision, wide range, and highly automated resistance measurement device with a wide range of application scenarios and important application value.
ZC-205A transformer DC resistance fast tester is the latest professional transformer DC resistance test equipment launched by our company. It is mainly used for the DC resistance test of transformer in power system. The instrument adopts large screen LCD display, full English menu, friendly man-machine interface, perfect function and convenient operation. It is an ideal instrument for transformer DC resistance test by power system and transformer manufacturers.
Kvtester Electronics Technology Co.,Ltd. is a high-tech enterprise specializing in power testing, testing, research and development, production, and sales of testing equipment. It has been engaged in the electrical testing industry for many years, and its products are of high quality. We welcome customers to come and purchase. Service hotline: 0086-27-81778799, to learn more, visit the official website: www.kvtester.com
