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The
Digital Ground Resistance Tester Model 4630 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 4630 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. The Model 4630 is powered by 9.6V, 3.5 AhNiMH
rechargeable batteries. A built-in recharge circuit, powered from
120/230V 50/60Hz line, also provides for testing while charging.
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
- Extrememly simple to operate:
connect-press-read
- LED on faceplate informs operator
of high input noise, high auxiliary rod resistance and fault
connections
- AC powered with rechargeable NiMH
batteries
- 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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