Grounding resistance tester is suitable for all kinds of electrical equipment maintenance, repair, test and verification of insulation test. The insulation resistance dividing line is uniform and clear for accurate reading. Easy to operate and carry. Here's a look at some of the common problems of the grounding resistance tester.
1, what does the output short-circuit current of the grounding resistance tester represent?
Long cables, motors with more windings, and transformers are capacitive loads. When measuring the resistance of such objects, the output short-circuit current of the resistance tester can reflect the internal resistance of the output high-voltage power supply inside the megohm meter.
2. In addition to the resistance value, why measure the absorption ratio and polarization index?
In the insulation test, the insulation resistance value at a certain time cannot completely reflect the insulation performance of the tested object. On the one hand, the same performance of insulating materials, large volume when the insulation resistance is small, large volume when the insulation resistance. On the other hand, insulating materials have charge absorption ratio (DAR) process and polarization (PI) process after applying high voltage.
3. Why use the "G" end of the instrument to measure higher resistance values?
The "G" end of the instrument (shielding terminal) is used to eliminate moisture and dirt in the test environment from affecting the measurement results. When measuring high resistance values, if the result is found to be difficult to stabilize, the G-terminal can be considered to reduce the error.
According to the PRINCIPLE of DC conversion, the electronic grounding resistance tester powered by several batteries is processed by the boost circuit, and the lower power supply voltage is raised to the higher output DC voltage, resulting in high voltage, but the output power is small.
Wuhan Xinshengneng Technology Co., Ltd. specializes in the production of grounding/insulation series of test equipment, the production of a variety of products, complete models, cost-effective products, welcome to call 0312-3188565 consultation!
