The Megger DET3TD and DET3TC 3-terminal ground testers instrument family has two models. The DET3TD offers the digital ground testing and bond testing capabilities. The DET3TC is the new model with the capability of testing on-site grounds without disconnecting the utility connection. The DET3TC includes a current measuring function for ART (Attached Rod Technique) testing capabilities. With this added function, on-site grounds can be tested separately without having to remove the utility connection.
They are designed to meet stringent safety standards and are rated CAT IV 100V. The ground testers have been designed to be easy to use – a large selector switch makes selection of 2 or 3 pole tests easy withgloved hands – and the design makes the fitting of shorting links to perform 2-pole tests a thing of the past. A large, clear, easy to read LCD and thumb-sized test button also make the instruments particularly well suited to the outdoor conditions of ground testing. In addition to this ease of use feature, the ground tester automatically checks the connection and conditions of the P spike, C spike, and also the level of ground noise, indicating the status on the display. The instruments also include a voltmeter to enable measurement of ground voltage. They can measureresistance from 0.01 ohms to 2 kΩ. Also, to allow accurate testing in noisy environments, the instruments are capable of rejecting noise up to 40V peak to peak.
By using the optional ICLAMP with the DET3TC, the user can augment the traditional fall-of-potential measurement method with ART (Attached Rod Technique), which allows electrode testing without disconnection and also leakage current measurements down to 0.5 mA. Grounding electrodes from simple to complex systems can be tested, including:
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