AEMC Model 6290 Micro-ohmmeter

The AEMC® Model 6290 high-current micro-ohmmeter is a portable, microprocessor controlled instrument. It has optimized filters and protection for measurements in electrical substation. The Model 6290 can be used to accurately measure very low contact resistances on high voltage circuit breakers, switches, busbars, etc., with test currents up to 200A. It employs the four-terminal Kelvin method to prevent errors caused by test leads and their contact resistances.

Measurement accuracy is assured through a state-of-the-art signal amplification system, offset-free with high long-term stability. Resistance readings are shown in the alphanumeric display with up to 4 1/2-digit resolution. It allows measurement resistances up to 20mΩ, and resolution of 0.1μΩ.

Test currents may be adjusted by the operator and are displayed using both an analog bargraph indicator and digital display.

The Model 6290 has an internal memory for storing up to 200 readings. The USB interface may be connected to a computer to download the stored values. The high-current generation system is based on modern technology that allows for a significant decrease in both weight, 24.25 lbs (11 kg), and size. The case is made of hard plastic, highly resistant to impact and environmental conditions. Internal, thermal sensors, in all sensitive components, prevent damage to the instrument caused by overheating.

This is a rugged but lightweight instrument, and may be easily carried by one person. It is water-resistant and can be used under severe weather conditions (IP54 with closed lid) offering an excellent performance working both in the laboratory and out in the field.

Application include:

• Test switchgear contact resistance
• Test circuit breaker contact resistance
• Test air frame bonding
• Test rail bonding
• Test pipeline bonding