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The AEMC 4620 4-Point Ground Resistance Tester performs ground resistance and soil resistivity tests. This direct reading testers measures from 0 to 2000 ohm, and is auto-ranging, so it automatically seeks outs the optimum measurement range. The Model 4620 is rugged, easy-to-use and is ideal for maintenance crews performing numerous tests. It exceeds mechanical and safety specifications for shock, vibration and drop tests called out in IEC standards. It is designed to reject high levels of interference, so it can be used under difficult conditions such as high stray currents that normally affect accuracy. Applications; Three-Point measurements of resistance to ground of ground rods and grids. Four-Point tests or soil resistivity measurements. Touch potential measurements, an alternative to 3-Point tests in evaluating electrical safety. Specifications. Measurement Ranges: Auto-ranging 0 to 2000 ohm. Resistance Resolution: 10 m-ohm (20 ohm), 100 m-ohm (200 ohm), 1 ohm (2000 ohm). Resistance Accuracy: 2% of Reading ± 1ct (20, 200 ohm), 5% of Reading ± 3cts (2000 ohm). Operating Frequency: 128 Hz square wave. Response Time: Approximately four to eight seconds for a stabilized measurement. Withstanding Voltage: 250 Vac or 100 Vdc.
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