AEMC 2118.80 Kelvin Clips for Micro-Ohmmeter, 1-10A, 20' Length

Ohmmeters measure resistance to the flow of current in an electrical component or circuit and check the continuity of an electrical circuit to detect electrical problems such as degraded insulation and improper circuit connections in equipment, wiring, and power supplies. Resistance is an indicator of the overall condition of the device being tested. Microohm meters and milliohm meters measure small resistance values, and megohm meters (also known as megaohm meters, or insulation resistance meters) measure large resistance values. Ohmmeters have an internal power supply, such as a battery or a capacitor, which supplies current to a circuit or component that is turned off. Test leads are connected in a series to the meter and the circuit or device being tested. As current flows through the circuit or device, the meter calculates the difference in voltage between the leads and measures the resistance. Ohmmeters have either two or four input terminals for test lead attachment. The two-terminal, or two-wire, measurement method provides measurements that include the resistance of the circuit or device being tested and the resistance of the test leads. Megohm meters generally use the two-wire method because it provides sufficient accuracy for measuring large values of resistance in insulation testing applications. The four-wire method eliminates resistance from the test leads and measures only the resistance of the circuit or device being tested. Milliohm and microohm meters generally use the four-wire method because it provides a greater degree of accuracy for measuring smaller values of resistance in low-resistance applications.

AEMC Instruments manufactures electrical testing and measurement instruments, including clamp meters, power quality analyzers, ground resistance testers, and data loggers. The company, founded in 1893, is headquartered in Foxborough, MA.