It adopts medium and large-scale integrated circuits and applies DC/AC conversion technology to combine the three-terminal and four-terminal button measurement methods into a new type of ground resistance measuring instrument. The working principle is that the built-in DC/AC converter converts direct current into a low-frequency constant current of alternating current, which forms a loop through the auxiliary ground electrode C and the measured object E, and an AC voltage drop is generated on the measured object

The YNCZ-30A grounding wire group DC resistance tester is developed according to the "Preventive Test Regulations for Electric Safety Tools and Appliances", and is used to test whether the contact between the ground wire lugs and bus clamps and the multi-strand copper soft conductors is good.

The YN2670 digital megohmmeter is composed of medium and large-scale integrated circuits. This watch has large output power, high short-circuit current value, and multiple output voltage levels (each model has four voltage levels). The working principle is that the DC high voltage generated by the internal battery as the power source through the DC/DC conversion passes from the E pole to the L pole through the tested product.

YN2671 insulation resistance tester is composed of medium and large-scale integrated circuits. This watch has large output power, high short-circuit current value, and multiple output voltage levels (each model has four voltage levels). The working principle is that the DC high voltage generated by the internal battery as the power source through the DC/DC conversion is from the E pole to the L pole through the tested product

This meter is a commonly used and indispensable meter for electric power, post and telecommunications, telecommunications, electromechanical installation and maintenance, and industrial enterprises that use electric power as industrial power or energy. It is suitable for measuring the resistance value of various insulating materials and the insulation resistance of transformers, motors, cables and electrical equipment.