In daily life and work, the insulation resistance of all electrical devices and equipment must meet the requirements of relevant specifications and standards to ensure the safety of on-site operation. Whether it is an electrical cable, a segmented protection device, a motor, a generator, etc., the electrical conductors must be isolated with high insulation resistance materials to prevent current from flowing out.

Over time, the quality of insulating materials can deteriorate due to the environment, operating conditions, or other external forces in which the equipment is placed. It reduces the resistivity of the insulating material, thereby increasing the leakage current, which may lead to serious accidents that threaten personal or property safety, and may cause factory production shutdowns and economic losses.

The insulation resistance tester is suitable for measuring the resistance value of various insulating materials and the insulation resistance of transformers, motors, cables and electrical equipment, etc., to ensure that these equipment, electrical appliances and lines work in a normal state and avoid accidents such as electric shock casualties and equipment damage.

For the test product with a large capacitive load, generally choose an insulation resistance tester with a suitable voltage level, a large enough output short-circuit current, a large insulation value range, and automatic discharge to the test product, otherwise the resistance value will have a greater impact. , and the absorption ratio test results have a larger error. For the test site with strong interference, the pointer type insulation resistance tester should be used, because the digital display is used, the measurement data has a large jump, so the real resistance value cannot be confirmed, and the pointer type megohmmeter itself is sensitive to strong magnetic fields. The interference is relatively slow (mechanical head damping effect). Even if there is influence, the pointer meter display only slightly wiggles, and the indication range is also very intuitive. For the occasions where the interference is small and the insulation resistance value is required to be accurately measured, the digital display should be selected, because the digital display is intuitive and the precision is high. For the occasion of measuring the absorption ratio and polarization index of large-capacity samples, an intelligent insulation resistance tester that can automatically measure the absorption ratio and polarization index should be selected.