AEMC Model 6292 high-current micro-ohmmeter

The AEMC high-current micro-ohmmeter Model 6292 measures very low contact resistances on high-voltage circuit breakers, switches, busbars and other locations with user-selectable test currents from 5 to 200 A.

The ohmmeter is powered from 120 V or 230 V, 50/60 Hz. The portable instrument incorporates optimised filters and protection for measurements in electrical substations. It employs the four-terminal Kelvin method to prevent errors caused by test leads and their contact resistances.

To guarantee measurement accuracy, the ohmmeter features a signal amplification system, off-set free with high, long-term stability. A backlit alphanumeric LCD shows resistance readings with up to 4.5 digit resolution. The instrument allows measurement resistances up to 1 Ω with resolution as low as 0.1 µΩ. Test currents can be user adjusted and shown on the display. The instrument includes an internal memory for storing up to 8000 readings, and a USB interface for connecting to a computer to download the stored values.

The ohmmeter incorporates an advanced high-current generation system using smaller components that significantly decreases its size and weight (11 kg), resulting in a rugged but lightweight instrument that can be easily carried by one person. The hard plastic case is highly resistant to impact and environmental conditions. Internal thermal sensors in all sensitive components protect the instrument from overheating.

The device is water resistant and can be used in poor weather conditions (IP54 with closed lid), suitable for use both in the laboratory and in the field.