Space exploration and engineering ■Structural metal to metal ■Ground network metal to metal ■Carbon fiber to metal ■Carbon fiber to carbon fiberData centers ■During installation ■Main panel supplies ■UPS supplies ■Generator supplies ■Verification of protective device contact resistance ■Busbar parallel feeds ■Busbar lapped joints ■Optimum resistance over torque ■Cable lug to busbar connections ■Copper cable to lug to busbar fault finding ■During maintenance ■Using trending data of all of the above aspects ■Verification after repairMedical ■Grounding and bonding systems for protection against ■Microshock ■Macroshock ■On new, in service, fully or partly connected systems ■Each medical location should be tested every 12 monthsRobotics ■Wiring systems and connections which are subject to stress/movement/vibration ■Bonding of component parts to minimize static ■Grounding of machine ■Welding leads of robot spot welderElectrical infrastructure ■Transformer windings ■Substation wiring and grounding ■Tap changers ■Battery strap resistance testing ■Cable resistance from one end ■Cable length ■Identification of parallel supplies while connected ■Cable to lug to connection fault finding ■Checking assembled connectionsMegger products overviewMegger offers solutions to ensure electrical system performance with its comprehensive line of low resistance ohmmeters and Micro-ohmmeters. An overview of the various products available is described below. For more information on these and many other Megger products, please contact us at 866-254-0962 or. Or visit our web site us.megger.com for the most up-to-date news, product and service information 24 hours a day.DLRO100 seriesThe DLRO100 offers a unique range of 100 A digital low resistance testers. Never before has CAT IV 600 V safety, operational IP54 ingress protection for dust and water, and lightweight, fast charge, Li Ion battery technology been available on a continuous 100 A low resistance tester. Providing low resistance measurements across a multitude of applications, including areas without access to mains power, the DLRO100 is extremely flexible. Some example applications include switchgear, circuit breaker contact resistance, bus bar and cable joints, wire and cable resistance, lightning conductor bonding, welded joints, ground connections and joints. Megger has taken a no compromise approach when designing the new DLRO100 series. The range offers a unique combination of features, including DualGroundTM tests, adjustable current ramp tests, high noise immunity, high power 100 A continuous tests and even remote control, yet it still manages to be small and lightweight. There are three models in the series, all of which have CAT IV 600 V and can test currents from 10 A to 110 A. The mid-range model adds data storage and DualGroundTM tests. The top of the range model adds to this, the capability of asset tags to enter unique asset ID’s with the DLRO100 Asset Tag Windows app, Bluetooth® download and USB remote operation.Fig 40: DLRO100 SeriesDLRO10 / DLRO10XThe DLRO10 and DLRO10X are built into a strong, lightweight case that is equally suitable in the field or in the laboratory. Light enough to be worn around the neck, they are small enough to be taken into areas which were previously too small to access. The DLRO10 uses a large, bright 4.5 digit LED display while the DLRO10X has a large, backlit LCD.The DLRO10 displays the average of measurements achieved using forward and reverse current, while the DLRO10X displays both individual measurements and the average. The DLRO10X uses a menu system controlled by a two axis paddle to allow the user to manually select the test current. The unit also adds real time download of results and on-board storage for later download to a PC.Fig 41: DLRO10 / DLRO10Xwww.megger.com 3534 A guide to low resistance testing www.megger.com
