Atec AEMC-3711, AEMC-3731 User Manual
Models 3711 & 3731 (pdf) 08/02
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Models 3711 and 3731 measure
ground rod and grid resistance in any
environment without the use of auxiliary ground rods. Clamp-on ground
resistance testers are used on
multi-grounded systems without
disconnecting the ground under test.
The Models 3711 and 3731 simply
clamp around the ground conductor
or rod and measure the resistance
to ground fast and accurately.
By performing measurements on
installed ground systems, the user
also verifies the quality of the
grounding connections and bonds.
Resistance and continuity of grounding
loops around pads and buildings may
also be measured.
Both models include a current
measurement function. The probe’s
high sensitivity enables measurement
of leakage current flowing to ground
or circulating in ground loops down to
1mA and neutral and phase currents
to 30Arms. This feature provides
additional information which is vital in
distribution ground networks carrying
higher levels of noise and harmonics
that affect power quality.
The Model 3731 offers an alarm
function and a memory (logging)
function. In the alarm mode, the probe
will audibly and visually indicate readings beyond set point. The user may
also have the alarm initiated above or
below the set point. This alarm feature
permits quick field checks where only
“pass” or “fail” readings will suffice.
Clamp-On Ground Resistance Tester
Models 3711 & 3731
US Patent No: 362,639
Models 3711 & 3731 (pdf) 08/02
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Features
• Simple and fast clamp-on operation
– no leads, no auxiliary rods or spacing requirements
• Direct reading of ground resistance
from 0.01Ω to 1200Ω
• Direct reading of continuity and
ground loop resistance
• Direct reading of ground leakage or
phase current from 1mA to 30Arms
• Jaw design with large 1.25" (32mm)
window – accommodates up to
1000MCM cables
• Auto-Off for power management
• Alarm function with adjustable set
point and buzzer for quick field
checks (Model 3731)
• Memory function to store 99 field
measurements for later retrieval
and analysis (Model 3731)
• Meets EN 61010, Cat. III
• CE Mark and UL approved
• Rugged Lexan
®
head and body
construction resists breakage
• Alarm settings and stored memory
information saved during shutdown
(Model 3731)
• Patented design
Applications
• Measure electrical ground rod and
grid resistance
• Use on multi-grounded systems
without disconnecting the ground rod
under test
• Measure resistance and continuity
of grounding loops around pads
and buildings
• Measure leakage current flowing
to ground or circulating in ground
systems
• Conduct field surveys and retrieve
and analyze readings at a later time
• Use on cell towers and
telecommunication sites
• Use on pools, spas and other
consumer installations
Models 3711 & 3731 (pdf) 08/02
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Product Construction
The Models 3711 and 3731 bodies
are built of Lexan
®
(or equivalent polycarbonate) for rugged use. The probe
heads are encapsulated in a doublewalled shell for extra strength and
reinforced for enhanced field reliability. Overall construction and mechanical design ratings such as drop test,
shock, vibration and weatherproofing
against water penetration or dust,
meet or exceed IEC standards. The
products have been designed to
EN 61010, Cat. III and UL approved.
Both models are CE Marked.
The probe head, (jaw) is a key
component in the measurement and
overall product performance. The
large jaw thickness permits use
on tight ground conductors on poles
and in manholes. The 1.25" (32mm)
opening accommodates not only
ground rods, but also larger ground
conductors (up to 1000MCM) typically
found in telecommunication buildings
or railroad applications.
The inner jaw is composed of two
independent and individually shielded
magnetic cores, permitting measurement without noise interference or
cross talk common to separate probe
instruments.
Thorough mechanical design, including
small winglets, ensures reliable and
repetitive jaw alignment for accuracy
and prevents undesirable contamination into the jaw spring assembly.
CE requirements and design minimize
electromagnetic interference near
substations and tower sites.
The ergonomic body design permits
one-handed operation. The guard
provides additional strength and
prevents the hand from slipping or
coming into contact with conductors
under test. The LCD lens cover may
be easily replaced if scratched. The
sealed push-buttons directly access all
test functions and are easily operated
even with gloved hands.
Functions & Features
Model 3711 3731
Ohms Range
✓ ✓
Arms Range
✓ ✓
Hold Function
✓ ✓
Self Test
✓ ✓
Auto-Off
✓ ✓
Battery Life Indicator
✓ ✓
Noise Indicator
✓ ✓
Open Jaw Indicator
✓ ✓
Closed Loop Indicator
✓ ✓
Multi-Tone Beeper
✓ ✓
Alarm Function –
✓
Memory (Logging) –
✓
Overview of Functions
Ω Displayed when measuring
resistance
mA, A Displayed when measuring
current
100
%
Percentage of battery life
remaining
Flashing indicates low battery
condition
Indicates the Auto-Off feature is
inactive
Indicates Alarm Active Hi or Lo
depending on which arrow is
displayed
HOLD pushbutton has been
pressed
Active beeper function
NOISE Noise in the reading
Probe jaws not closed properly.
Alarm set points
MEM Memory function active
MR 88 Memory Recall (MR) and
location (from 1 to 99)
R< 1Ω Resistance measured is
below 1Ω
H
HOLD
Buttons
ON/OFF: Power ON or power OFF.
Activates display self test at power-up
Ω: Resistance measurement.
(Increment the alarm set point and
the memory position when in
programming mode.)
A: Current measurement. (Adjusts
the alarm set point and the memory
position when in programming mode.)
AL (3731 only): Activate /deactivate
the alarm function. Access the value
of the alarm set point when in
programming mode
MEM (3731 only): Activate the memory
function or to read the stored values in
MR (Memory Recall). Clears the
memory when in programming mode
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