Atec AEMC-4620, AEMC-4630 User Manual

Models 4620 & 4630 (pdf) 08/02

Technical Assistance [phone] www.aemc.com 1 of 6

Digital Ground Resistance Tester
Models 4620 and 4630 perform ground
resistance and soil resistivity tests.
These direct reading testers measure
from 0 to 2000Ω, and are auto­ranging, so they automatically seek out
the optimum measurement range.
Easy-to-use — simply connect the
leads, Press-to-Measure and read
the results.

The large LCD (nearly

3

/4" high
characters) is easy-to-read, and also
indicates low battery status, overrange
and 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 Models 4620 and 4630 are fuse
protected up to >250V

AC against

accidental connection to live circuits.
In the event of a system fault, they can
withstand 250V

AC with spikes of

3000V

AC 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 Model 4620 is powered by eight,
C cell batteries.

The Model 4630 is powered by 9.6V,

3.5 Ah NiMH rechargeable batteries. A
built-in recharge circuit, powered from
120/230V 50/60Hz line, also provides
for testing while recharging.

Both models will perform over 2000
15 second tests between recharging
(Model 4630) or battery replacement
(Model 4620).

The Ground Resistance Tester
Models 4620 and 4630 are rugged,
easy-to-use instruments 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.

Digital Ground Resistance Tester
Models 4620 & 4630

Models 4620 & 4630 (pdf) 08/02

Technical Assistance [phone] www.aemc.com 2 of 6

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 and interference

• Extremely simple to operate:

connect – press – read

• LED on faceplate informs operator of

high input noise, high auxiliary rod
resistance and fault connections

• Large easy-to-read backlit display

• Battery powered (Model 4620)

• AC powered with rechargeable

NiMH batteries (Model 4630)

• Rugged dustproof and rainproof

field case

• Can also be used for continuity

tests on bonding

• Color-coded terminals

Applications

• Three-Point measurements of

resistance to ground of ground
rods and grids. Three-Point mea-

surements 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 (the outline of
the part of equipment in contact with
the earth) is comparable to the size
of the ground to be tested.

• Two-Point tests for continuity tests

on bonding or on pre-established
grounds. This test is commonly

performed in urban environments
where proper auxiliary electrode
placement may be obscured by
confined real estate. Measurements
are referenced against a good local
ground conductor.