Atec AEMC-4500 - Manual

Model 4500 (pdf) Rev. 04 11/04
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Digital Ground Resistance Tester
Model 4500
The Digital Ground Resistance Tester
Model 4500 is designed for measuring
very low resistance on large grounding
systems, such as ground grids and
ground mats.
It rejects high levels of interference
voltages at DC or 60Hz and its
harmonics, and can be used under
difficult conditions such as high stray
currents or excessive auxiliary elec-
trode resistance without substantially
affecting accuracy.
The Model 4500 has three selectable
test current ranges (2, 10, 50mA) and
five selectable resistance testing
ranges (2
Ω , 20 Ω , 200 Ω , 2000 Ω and
20k Ω ). It is capable of direct readings
with a resolution as low as 1m Ω .
With such a wide resistance capability,
the Model 4500 is capable of measuring
the resistivities of soil and other materials
from below 10m
Ω -cm to over 1M Ω -cm.
Readings are displayed on a large
(0.71"), 3
1 /
2
digit LCD. The LCD blinks
and a pointer on the display lights to
warn of excess stray current or auxiliary
electrode resistance, or when there is a
lack of continuity between leads and
electrodes. A beeper will notify the user
if voltage greater than 20 volts peak is
present between terminals X (C1) and
Y (P2) or X and Z (C2) when the
ground leads are connected.
The instrument is fuse protected up
to 500A
AC to protect the instrument
against voltage into the test leads.
Power is supplied by a rechargeable
12V battery; the tester may also be
operated from an external 12V
DC supply.
A battery charge indicator and low
battery indicator appear on the LCD
and a dual-voltage charging unit is built
into the instrument.
The heavy-duty, safety yellow case
is dust and water resistant to ensure
reliable field use. The cover may be
detached while the meter is in use,
if desired. Optional test kits are
available for ground resistance and
soil resistivity tests.