T&D World Magazine

Ground Resistance Testers are Multifunctional, Digital

AEMC’s rugged, digital ground resistance tester Model 6470 performs grounding resistance, earth coupling measurement, soil resistivity and bonding tests. This direct reading tester measures from 0.01 to 99,000 Ohms, and is auto-ranging, automatically seeking out the optimum measurement range test current and test frequency. The adjustable test frequency (either manual or automatic) from 40 to 513 Hz test voltage provides rejection of high levels of interference, allowing it to be used under difficult conditions such as the presence of high stray currents that normally affect accuracy.

Easy-to-use and accurate — connect the leads, select the test mode, Press-to-Measure and read the results. Up to 512 test results can be stored in internal memory for later recall to the display or downloaded to a PC for analysis and hard copy reports with automatic fall of potential plots.

The Model 6470 overvoltage protected to greater than 250 Vac with spikes of 3000 Vac or 1000 Vdc against accidental connection to live circuits. The live voltage is also displayed on screen.

Additional features of the Model 6470 include: a heavy-duty field case sealed against dust and water when closed; user selectable soil resistivity test method (Wenner or Schlumberger) with direct reading soil resistivity and user selectable 2-point or 4-point bond resistance testing.

The Model 6470 is powered by NiMH rechargeable batteries. Testing while recharging is allowed. The Model 6470 can also be powered from a 12 V vehicle battery.

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