The DC resistance tester is a conventional instrument used in electrical testing to test the DC resistance of transformer windings. The DC resistance of power transformer windings is a mandatory test item in the electrical testing regulations, with the aim of detecting the state of the DC resistance of transformer windings. Now let's talk about how to choose the appropriate type when using a DC resistance tester.
The selection of a DC resistance tester mainly depends on the parameter requirements of the test object. Firstly, there is the DC output. According to different voltage levels of the test object, the DC output of the DC resistance tester has many different outputs, from 3A, 5A, to 10A, 20A, 40A, 50A. The DC output levels of the DC resistance tester are many, mainly depending on the measurement range of the test object and the required level of current output to determine this parameter.
Secondly, the higher the testing accuracy of the DC resistance tester, the higher the price. If the testing accuracy requirements of the test object are relatively high, then when choosing a DC resistance tester, it is also necessary to choose the corresponding testing instrument that meets the testing requirements of the test object. At present, the testing accuracy of DC resistance testers on the market is mostly within an error range of 0.2% and 0.5%. The DC resistance tester needs to test accurately, and there is another function to pay attention to, whether it has anti-interference function. The stronger the anti-interference function, the less the test data will change with the changes in the on-site environment. Therefore, the accuracy of its test data will also be higher.
Finally, when choosing a DC resistance tester, you can consider some additional values. For example, choosing a reliable manufacturer can be judged by its operating time. The longer the operating time, the more reliable it is. Then, from the perspective of the warranty period and after-sales service of the DC resistance tester, the more reliable the after-sales service is, the more reliable the choice can be.
Returning to the function of a DC resistance tester, choosing an intelligent and automated testing instrument can make testing personnel more efficient. Some DC resistance testers can not only detect the DC resistance of transformer windings, but also measure cable resistance and contact resistance of low-voltage switches. Therefore, having multiple testing functions is also a good way to choose a useful DC resistance tester.
The selection of a DC resistance tester can be summarized as starting from the testing requirements of the test object. Firstly, it is necessary to meet the testing requirements of the test object. Secondly, a reliable manufacturer should be selected, and finally, other additional functions of the DC resistance tester can be considered. The above are some suggestions on how to choose a DC resistance tester.