eristysvastusmittari

An eristysvastusmittari, also known as an insulation resistance tester or megohmmeter, is an electrical instrument used to measure the electrical resistance of insulation. This measurement is crucial for assessing the integrity of electrical insulation in various applications. High insulation resistance indicates good insulation, while low resistance suggests a potential problem, such as degradation, moisture ingress, or damage.

These devices typically operate by applying a high DC voltage across the insulation being tested and measuring the resulting current flow. According to Ohm's Law, a higher resistance will produce a lower current for a given voltage. The meter then calculates and displays the resistance value, often in megaohms (MΩ) or gigaohms (GΩ).

Eristysvastusmittarit are essential tools for electrical safety and maintenance. They are used to test the insulation of electrical wiring, motors, transformers, cables, and other equipment. Regular testing helps prevent electrical failures, fires, and electric shocks by identifying insulation weaknesses before they become critical. Different types of eristysvastusmittarit are available, ranging from simple handheld units to more sophisticated digital models with advanced features like data logging and programmable test voltages. The choice of tester and test voltage depends on the specific application and the type of insulation being evaluated.