Megger’s already popular 3-terminal ground testing instrument family includes the following models:
DET3TD For basic requirements it provides digital ground testing and bond testing capabilities
DET3TC The revolutionary 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 (as explained further in this document). The complete kit of instrument, test leads, stakes, batteries and calibration certificate is delivered in a tough polypropylene carry case – everything you need to start testing in one package. Optional terminal adapters are available for acceptance of a variety of test leads.
All models are rated to IP54, making them truly outdoor instruments. 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 with gloved 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 measure resistance from 0.01 ohms to 2 kO. Also, to allow accurate testing in noisy environments, the instruments are capable of rejecting noise up to 40V peak to peak.
The Megger ground testers are powered by eight AA batteries which are widely available and also give excellent testing time – the status of these batteries is given by a bar graph on the LCD, allowing the operator to decide when to change the batteries before they expire.