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Electrical resistance testing solutions

Prioritise your safety and infrastructure efficiency with a proven partner.

When precision is non-negotiable, don’t settle for just any ground resistance tester. Go with the best. At Megger, we understand that your challenges are as diverse as your responsibilities, and we have an unwavering commitment to helping you achieve both through our comprehensive portfolio of top-tier test instruments.

The applications for low resistance testing are varied, but some of the most common are:
 
Testing switches, connectors, and relays - to ensure contact resistance is within specified values.
Cable resistance - too low shows too much copper in the cable (higher costs), and too high means insufficient copper, so the cable’s current carrying capacity is compromised.
Motors and generators - to determine heat rise under load, measure winding resistance, and check for short or open circuits.
Fuses - to ensure resistance is within specified values.
Cable looms - to check the bonding and interconnections when installing equipment, racks, etc.
UPS/car batteries - carrier to plate weld resistance where a high resistance indicates poor weld quality that will restrict the battery’s ability to carry current.
The applications for low resistance testing are varied, but some of the most common in the railway industry are:
 
Strap and wire bond between rail segments - for maintaining the performance of control and telephone systems and minimising power loss.
Cable joints - for power system efficiency.
Earth/ground bonds - to ensure lightning protection on structures and limit step and touch potential on metal floors, handrails, ground mats, metal cladding, platform edge doors, and more.

The DLRO100 test lead is non-CAT rated kelvin clamp that has a narrow jaw width for applications such as circuit breaker testing where the gap for testing is hard to reach. These specialised test leads are 5m long and are for use on applications up to 100A. The expandable metal jaw provides an added versatility for connections to any sized testing surfaces. Where the standard DLRO100 Kelvin leads are not suitable, due to the narrow gap for testing, these non-CAT rated leads are the perfect solution. 

Additional Resources

Take a deeper dive into electrical resistance test instruments through our comprehensive guides.