When choosing a loop resistance tester, you must choose a loop resistance tester with a suitable output current according to your own test requirements. The main reason is whether the current gear is continuously adjustable or fixed, and whether it is high-precision. Explain the main points in detail:

1. Compared with other types of resistance testers, the loop resistance tester adopts the principle of four-wire method due to its large test current. There will be a relatively obvious voltage drop at both ends of the test, which has a high accuracy. When choosing a loop resistance tester, firstly, it can accurately measure the resistance of the test sample, and secondly, it can be continuously tested. The constant current power supply needs to be stable enough. The loop resistance tester uses the latest power supply technology, which can be used for a long time. The continuous output of large current can naturally ensure better test results in the entire test, and it can also accurately control the data during the test. It can be said that it is a very cost-effective loop resistance tester. Up.

2. The current selection of the loop resistance tester is also very important. Regarding the loop resistance and contact resistance of the power industry, it is required to use a current of not less than 100A for the tester. Therefore, the current loop resistance testers produced by domestic manufacturers are all It can reach 100A, but for some tested products, the 100A test current cannot be passed through. If you choose other types of low-current resistance testers, the accuracy cannot be guaranteed. In this case, the 100A loop resistance tester, the current is 0 ~100A is continuously adjustable, and the accuracy is guaranteed. Of course, there are some tested products, such as the loop resistance tester of the isolated knife switch. Due to long-term outdoor exposure, the contact surface of the knife switch is oxidized. Although the national standard requires the use of 100A test current. Yes, but in order to ensure the accuracy of the data, you can choose a loop resistance tester with a larger test current, because a large enough current can quickly burn through the oxide film and improve the accuracy of the data.

3. So in summary, we know the elements when choosing loop resistance test, mainly current and accuracy, and of course the most important thing is the quality of the instrument. A good loop resistance tester can be more efficient when it works. high,