Insulation resistance tester is a precision instrument for measuring the insulation resistance of lines or materials



An insulation resistance tester (commonly known as a megohmmeter or megger) is a precision instrument specifically used to measure the insulation resistance of electrical equipment, lines, or materials. It applies a stable DC high voltage to the object under test, measures the resulting leakage current, and thereby calculates the insulation resistance value. It is a key tool for determining whether the insulation performance of electrical equipment is good, and whether there are defects such as moisture, aging, or breakdown.