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This tester measures from 0 to 2000 Ohm, and are auto- ranging, so it automatically seeks out the optimum measurement range. Easy-to-use: simply connect the leads, press-tomeasure and read the results. The large LCD (nearly 3/4" high characters) is easy-to-read, and also indicate low battery status, overrange, test lead shorts and lead reversals. Three LED indicators on the front panel continuously warn the user of measurement problems to ensure accurate and reliable tests. The 4620 is fuse protected up to >250Vac against accidental connection to live circuits. In the event of a system fault, they can withstand 250Vac with spikes of up to 3000Vac or 1000Vdc.
The heavy-duty field case is sealed against dust and water when closed. The meter itself is self-contained within an inner case providing additional environmental and insulation protection. The test button is also sealed against the elements. The meter is powered by eight, alkaline C cell batteries. Both models will perform over 2000- for the 15 second tests between recharging or battery replacement. The Ground Resistance Tester Model 4620 is a rugged, easy-to-use instrument ideal for maintenance crews performing numerous tests. Both models exceed mechanical and safety specifications for shock, vibration and drop tests called out in IEC standards. They are designed to reject high levels of interference, so they can be used under difficult conditions such as high stray currents that normally affect accuracy.
MODELS | 4620 | 4630 | ||
ELECTRICAL | ||||
Range | 20Ω | 200Ω | 2000Ω | |
Measurement Range | 0.00 to 19.99Ω | 20.0 to 199.9Ω | 200 to 1999Ω | |
Resolution | 10mΩ | 100mΩ | 1Ω | |
Open Voltage | ≤42V peak | ≤42V peak | ≤42V peak | |
Resistance Measurement | 128Hz square wave | 128Hz square wave | 128Hz square wave | |
Test Current | 10mA | 1mA | 0.1mA | |
Accuracy | 2% of Reading | 2% of Reading | 5% of Reading | |
Auxiliary Electrode Influence |
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Response Time | Approximately four to eight seconds for a | |||
Withstanding Voltage | 250Vac or 100Vdc | |||
Power Source | Eight C cell batteries (included); | 120/230V 50/60Hz | ||
Battery Life | >2000 15-second measurements; LO BAT indication on LCD | |||
Fuse Protection | 0.1A, >250V, 0.25 x 1.25"; 30kA Interrupt Capacity |
- Three-Point measurements of resistance to ground of ground rods and grids. Three-Point measurements are generally used when the electrode or grid can be easily disconnected, if corrosion is suspected, or in circumstances where ground faults are unlikely to occur
- Four-Point tests or soil resistivity measurements. Locating areas of lowest soil resistivity is essential for achieving an economical grounding installation
- Touch potential measurements, an alternative to 3-Point tests in evaluating electrical safety. This test is recommended when the ground cannot be disconnected, where ground faults are highly likely to occur, or when the "footprint" of grounded equipment is comparable to the size of the ground to be tested.