Clamps with elliptical apertures that can accommodate cables up to 39 mm diameter make Megger’s new DET14C and DET24C earth resistance testers quick and easy to use, even with large conductors where access is restricted.
These instruments have a CATIV 600 V safety rating in line with EN61010, with 8 kV of transient isolation. Operator safety is further enhanced by a hazardous current warning that is operative on all test ranges. To help ensure long-term accuracy and reliability, the instruments use clamps that have smooth mating jaw faces. These are easy to clean and eliminate the easily bent interlocking teeth found on many other earth resistance clamp testers. Designed to allow accurate measurement of earth resistance in multiple loop systems without the inconvenience of having to break earth connections, the new instruments can measure ground resistance over the range 50 mΩ to 1500 Ω, and true RMS ground leakage current from 0,2 mA to 35 A.
As an aid to use in hard-to-reach locations, they incorporate a convenient pre-hold function that automatically initiates a test when clamped round an electrode and then holds the reading for easy review when the test is complete. DET14C and DET24C earth resistance clamp testers are powered by standard AA batteries and both models offer auto ranging, high and low alarms, automatic self-calibration and internal memory that allows results to be recorded and reviewed. In addition, a display backlight, along with hold key that produces an audible tone when pressed, make it easy to use the instruments even in areas where lighting is poor or access is restricted.
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