Contact Resistance Meter

The Motwane PCRM-200S & PCRM-100S is a top-notch Digital Contact Resistance Meter designed for precise measurement of ultra-low resistances in the micro-ohm range. Built with reliability in mind, it employs the Kelvin four-wire method to ensure accurate results by eliminating errors that can arise from lead resistance.

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Micro-ohm testing reveals hidden faults in electrical joints and contacts by measuring their resistance, which should be extremely low, typically in the micro-ohm range (µΩ). Over time, a variety of factors such as arcing, corrosion, and wear can increase this resistance.
A micro-ohm meter ensures the reliability and safety of circuit breakers and switchgear contacts by detecting very small increases in contact resistance. High resistance in these contacts can cause excessive heating, energy loss, and even failure during fault conditions. By precisely measuring resistance at the micro-ohm level, the meter helps identify worn, corroded, or loose contacts early, ensuring proper current carrying capacity, preventing overheating, and maintaining safe and reliable operation of the equipment.
A micro-ohm meter supports preventive maintenance by detecting small resistance rises in joints and contacts early. This helps prevent overheating, failures, and downtime, ensuring safer operation and extending the lifespan of high-current electrical assets.
Over time, repeated electrical arcing can cause contact resistance to build up in circuit breakers. This increase in resistance can significantly decrease the contact's ability to carry current, which is detrimental to the breaker's performance. Measuring contact resistance helps in the regular maintenance of these systems.
It uses the Kelvin 4-wire connection method to accurately measure low resistance, which helps eliminate the resistance of the test leads from the measurement.