Circuit breaker or relay contacts, bus bars and switchgears constantly carry high currents. If the junctions deteriorate, the current carrying efficiency may be reduced and cause several problems like welding of contacts, localized Ohmic heating and eventual component failure.
Megger is known for their high quality and accurate MicroOhmmeters. Some of the popular testers in their product line are the Megger DLRO200-115 and the Megger MOM2 DLRO. Both testers can provide a maximum output of 200 Amperes per test. However, each tester has unique characteristics which make them suitable for specific applications.
Need a MicroOhmmeter that is lightweight and handy? Then consider renting the Megger MOM2, a compact device that delivers a high test current of 200 Amperes using batteries. How is this possible? The Megger MOM2 utilizes an ultra-capacitor that can store a large amount of current compared to ordinary capacitors. The ultra-capacitor has a low internal capacitance which allows it to deliver a very high current on discharge. A MicroOhmmeter suitable for low resistance measurement applications that can tolerate variations in the test current, the Megger MOM2 also features a DualGround configuration for extra safety when testing. It can measure resistance from 1 μΩ to 1000 mΩ and sets the range automatically, saving time and effort during resistance measurement. Another great feature of this meter is its Bluetooth connectivity, allowing for easy downloading of test results from a computer. The Megger MOM2 is compliant with the IEC and IEEE standards to ensure accuracy and safety.
This MicroOhmmeter is suitable for applications that demand precise, noise-free and smooth DC test current. The Megger DLRO200-115 has an extra filtering system that suppresses AC mains line ripple. The special filtering circuit of the Megger DLRO200-115 helps eliminate accidental tripping of a circuit breaker’s control caused by magnetic transients. It can put out a test current 200 Amperes through a loop resistance of 11 mΩ. The output current is also variable from 10 Amperes up to 200 Amperes. The high output current allows the meter to measure resistance as low as 0.1 μΩ. It also has an internal memory where you can store 300 test results and also notes. The Megger DLRO200-115 has an Ingress Protection 54 which makes it suitable for production, field and workshop applications. The unit weighs only 15kg which makes it easy to move around.