Atec AEMC-3711, AEMC-3731 User Manual

Models 3711 & 3731 (pdf) 08/02

Technical Assistance [phone] www.aemc.com 1 of 7

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

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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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Specifications

ELECTRICAL

Ground Resistance Ranges Auto-Ranging 0.01Ω to 1200Ω

Range 0.10 to 1.0 to 50.0 toΩ 100 to 200 to 400 to 600 to

1.00Ω 50.0Ω 100.0Ω 200Ω 400Ω 600Ω 1200Ω

Resolution 0.01Ω 0.1Ω 0.5Ω 1Ω 5Ω 10Ω 50Ω

Accuracy ±2% ±1.5% ±2% ±3% ±6% ±10% Approx. 25%

of Reading of Reading of Reading of Reading of Reading of Reading of Reading

± 0.02Ω ± 0.1Ω ± 0.5Ω ± 1Ω ± 10Ω ± 10Ω ± 50Ω

Current Measurement Ranges Auto-Ranging 1mA to 30.00Arms

Range 1 to 299mA 0.300 to 2.999A 3.00 to 29.99A
Resolution 1mA 0.001A 0.01A
Accuracy ±2.5% of Reading + 2mA ±2.5% of Reading + 2mA ±2.5% of Reading + 20mA

Resistance Measurement
Frequency

2403Hz

Resistance Overload OL displayed above 1200Ω

Current Measurement
Frequency

47 to 800Hz

Current Overload OL displayed above 29.99Arms
Power Source 9V Alkaline battery (IEC 6LF22 or NEDA 1604A)
Battery Life Typical: 8 hours or approx. 1000 measurements of 30 seconds

MECHANICAL

Display 33/4 Digit, 1.73 x 1.10" (44 x 28mm)
Operating Temperature 14° to 131°F (-10° to 55°C)
Storage Temperature -22° to 158°F (-30° to 70°C)
Relative Humidity 10 to 90% RH @ 14° to 104°F (-10° to 40°C), 75% RH @ 131°F (55°C)
Dimensions 9.25 x 3.94 x 2.17" (235 x 100 x 55mm)
Weight 2.2 lbs (1kg)
Jaw Window Diameter 1.25" (32mm)
Jaw Opening 1.38" (35mm)
Case Lexan®920A or equivalent (UL94V2)
Colors Gray body, red jaws
Shock Test IEC 68-2-27
Vibration Test IEC 68-2-66
Drop Test (1m) IEC 68-2-32
Dielectric Test 2500VAC
Environmental IP30, IEC 359, Group III
Working Voltage 150V, Cat. III – Pollution Degree 2; 300V, Cat. II – Pollution Degree 2

Max Overload (A or Ω Function) 100A continuous, 200A (<5s) 50/60Hz

U.S. Patent No. 362,639
UL File No. E192383

SAFETY

Safety Rating EN 61010-2-032 (Class 2) Double Insulation
CE Mark Yes

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Clamp-on Ground Resistance Tester

Models 3711 & 3731 include

calibration loop, battery and user manual

in hard carrying case.

Calibration Check Loop (included)

Accessories

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1. Head assembly

2. Hold button

3. Display

4. On/Off

5. Ω: Resistance measurements

6. A: Current measurements

7. AL: Alarm button
(Model 3731 only)

8. MEM: Memory button
(Model 3731 only)

9. Lever opens and closes jaws

ORDERING INFORMATION CATALOG NO.

Ground Resistance Tester Model 3711 (Clamp-On). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cat. #2117.60

Includes hard carrying case, 9V Alkaline battery, 25Ω calibration check loop and user manual

Ground Resistance Tester Model 3731 (Clamp-On) with memory and alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cat. #2117.61

Includes hard carrying case, 9V Alkaline battery, 25Ω calibration check loop and user manual

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Contact Us

United States & Canada:

Chauvin Arnoux

®

, Inc.

d.b.a. AEMC

®

Instruments
200 Foxborough Blvd.
Foxborough, MA 02035 USA
[phone] • Fax [phone]
www.aemc.com

Customer Support –for placing an order, obtaining price & delivery:

[e-mail]

Sales Department – for general sales information:

[e-mail]

Repair and Calibration Service – for information on repair & calibration, obtaining a user manual:

[e-mail]

Technical and Product Application Support – for technical and application support:

[e-mail]

Webmaster – for information regarding www.aemc.com:

[e-mail]

South America, Central America, Mexico, Caribbean, Australia & New Zealand:

Chauvin Arnoux

®

, Inc.

d.b.a. AEMC

®

Instruments
15 Faraday Drive
Dover, NH 03820 USA
[phone] • Fax [phone]
[e-mail]
www.aemc.com

All other countries:

Chauvin Arnoux SCA
190, rue Championnet
75876 Paris Cedex 18, France
33 1 44 85 45 28 • Fax [phone]
[e-mail]
www.chauvin-arnoux.com