Mikroohmmätare

mikroohmmätare, also known as a micro-ohmmeter, is a specialized electrical instrument used to measure very low resistances, typically in the range of microohms (µΩ) to milliohms (mΩ). These low resistances are often found in components and systems where minimal electrical loss is critical. The instrument employs a four-wire or Kelvin sensing method to eliminate the resistance of the test leads and contact resistance from the measurement. This is crucial because the resistance of the leads themselves can be comparable to or even greater than the resistance being measured, leading to inaccurate results.

The typical operation involves applying a known, stable current through the device under test and then measuring the resulting voltage drop across it. By applying Ohm's Law (R = V/I), the resistance can be accurately calculated. Mikroohmmätare are essential tools in various industries. They are used for testing the integrity of electrical connections in power systems, verifying the resistance of busbars, switchgear contacts, circuit breakers, and transformer windings. In manufacturing, they are employed to check the quality of welds, the resistance of motor windings, and the conductivity of components. The precision offered by a mikroohmmätare is vital for ensuring safety, efficiency, and reliability in these applications.