By hvhipot 
How to choose 3A, 5A earth grid grounding resistance tester?
The 3A and 5A earth grid grounding resistance testers have the same functions except for the different currents. The larger the current, the larger the area of the ground grid and the greater the test current, the stronger the anti-interference ability, regardless of practicability or scalability. The 5A earth grid grounding resistance tester has a certain degree of advantages. First of all, the appearance is a metal structure, which is undoubtedly the signal shielding. The current gear distribution is 1A, 1.5A, 2A, 2.5A, 3A, 3.5A, 4A, 4.5 A and 5A, a total of 9 selection gears, 4 more gears than the 3A grounding network instrument, when measuring under some conditions with relatively large magnetic field interference, the 5A grounding grid resistance test does not have to worry about affecting the test results at all. In the earliest measurements of ground grid resistance, the ability to suppress interference was achieved by increasing the current, so the larger the current, the stronger the ability to suppress interference. In addition, although the two models also use variable frequency modules, their structures and materials are different. Interested friends can make physical comparisons. Secondly, the core of 5A grounding resistance test research and development is durability and reliable quality. He did not think too much about lightness. Relatively speaking, if it is a real and regular use, I mainly recommend 5A earth grounding. For resistance testing, if you don’t use it often and the site is relatively uncomplicated, then choose the 3A earth grid grounding resistance test. After all, the price is still a little lower than 5A.
Can the earth grid ground resistance test measure the step voltage?
In marketing activities, some users will ask whether the ground grid tester can measure the step voltage. The answer is yes. Generally, there is no special requirement. It is not equipped with a separate sampler. If you have to measure the step voltage or the ground voltage We should communicate with the sales staff in advance, and we must re-flash the corresponding software version and accessories when we leave the library, otherwise it will not be available.