likspänningsmotståndsmätning

Likspänningsmotståndsmätning, often translated as DC resistance measurement, is a fundamental electrical testing technique used to determine the resistance of a component or circuit when subjected to direct current. This measurement is crucial for assessing the integrity of electrical conductors, the condition of windings in motors and transformers, and the functionality of various electronic components. The principle behind likspänningsmotståndsmätning involves applying a known DC voltage across the item under test and measuring the resulting current. According to Ohm's Law, resistance (R) is calculated by dividing the applied voltage (V) by the measured current (I): R = V/I. Specialized instruments called ohmmeters or micro-ohmmeters are employed for these measurements. Micro-ohmmeters are particularly useful for measuring very low resistances, often found in power cables and switchgear, as they utilize a four-wire (Kelvin) measurement technique to minimize the influence of lead and contact resistances. Inaccurate or high resistance values can indicate problems such as poor connections, corrosion, damaged insulation, or material defects. Therefore, likspänningsmotståndsmätning serves as a vital diagnostic tool in electrical maintenance, quality control, and troubleshooting across various industries.