AEMC Model 6290 micro-ohmmeter

The AEMC high-current Model 6290 micro-ohmmeter is a portable, microprocessor-controlled instrument. It can be used to accurately measure very low contact resistances with test currents up to 200 A.

The instrument employs the four-terminal Kelvin method to prevent errors caused by test leads and their contact resistances. It has optimised filters and protection for measurements in electrical substations.

AEMC claims measurement accuracy is guaranteed through a signal amplification system, offset free with long-term stability. Resistance readings are shown in the alphanumeric display with up to 4½-digit resolution. It allows measurement resistances up to 20 mΩ, and resolution of 0.1 µΩ.

Test currents may be adjusted by the operator and are measured using an analog bar-graph indicator and backlit digital display.

Capable of storing up to 200 readings in its internal memory, the device has a USB interface that can be connected to a computer to download the stored values. DataView software enables direct printout using a PC.

Rugged, lightweight and water resistant, it is IP54 rated with closed lid. To prevent overheating, the device has internal thermal sensors in all sensitive components.

The device is suitable for testing switchgear contact resistance, circuit-breaker contact resistance, air-frame bonding, rail bonding and pipeline bonding.