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The Digital Ground Resistance
Tester Model 4620 performs ground resistance and soil resistivity
tests. This direct reading tester measures from 0 to 2000Ω , and is
auto-ranging, so it automatically seeks out 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.
Features
- Measures soil
resistivity (4-Point) method
- Measures ground
resistance (2- and 3-Point) Fall-of-Potential method
- Step voltage
tests and touch potential measurements
- Auto-Ranging:
automatically selects the optimum range
- Designed to
reject high levels of noise interference
- Extremely
simple to operate: connect-press-read
- LED on
faceplate informs operator of high input noise, high auxiliary rod
resistance and fault connections
- Battery powered
- Rugged,
dustproof, and rainproof field case
- Can also be
used for continuity tests on bonding
- Color-coded
terminals
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Applications
- 3-Point
measurements of resistance to ground of ground rods and grids
3-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
- 4-Point tests
of 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
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