Atec AEMC-3710, AEMC-3730 User Manual

CLAMP-ON GROUND RESISTANCE TESTER

MODELS 3710/3730

➤ Measure ground rod and small grid resistance
➤ Use in multi-grounded systems without

disconnecting the ground under test

➤ Measure resistance and continuity of

grounding loops around pads and buildings

➤ Measure leakage current flowing to ground

or circulating in ground loops

➤ Conduct quick field checks
➤ Conduct field surveys and retrieve and

analyze readings at a later time

➤ UL, CSA listed and CE Mark

AEMC

INSTRUMENTS

®

®

Measure ground rod and small grid resistance in any environ­ment without the use of auxiliary ground rods. Clamp-on ground
resistance testers are used in multi-grounded systems without
disconnecting the ground under test.The Models 3710 and 3730
simply clamp around the ground conductor or rod and measure
the resistance to ground.By perf orming measurements on intact
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 currents to 30Arms.This feature provides addi­tional information which is becoming vital as distribution
ground networks carry higher levels of noise and harmonics
which affect power quality.

The Model 3730 offers an alarm function and a memory
(logging) function. In the alar m mode, the probe will audi­bly and visually indicate if the reading is beyond an input
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.

Features

➤ Simple and fast clamp-on operation - no leads,

no auxiliary rods or spacing requirements

➤ Direct reading of ground r esistance fr om

1Ω to 1200Ω

➤ Direct reading of continuity and ground

loop resistance

➤ Direct reading of ground leakage current from

1mA to 30Arms

➤ Jaw design with large 1.25" (32 mm) window

accommodates up to 1000 MCM cables

➤ Auto-off for power management
➤ Alarm function with adjustable set point and

buzzer for quick field checks

➤ Memory function to store 99 field measure-

ments for later retrieval and analysis

➤ UL, CSA and GS listed, meets IEC 1010-2-032

and CE marked.

➤ Alarm settings and stored memory information

saved during shutdown

➤ US Patent No. 362,639

Ground Resistance Tester Models 3710 and 3730

TECHNICAL ASSISTANCE [phone]

www.aemc.com

TECHNICAL ASSISTANCE [phone]

www.aemc.com

Overview of Functions

8.8.8.8 3,000 count display

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

HOLD 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

88

Memory Recall (MR) and register
Resistance measured is below 1Ω

On/Off

Power ON or power OFF. Activates display
self test at power-up.

Ω ( )

Resistance measurement. (Adjusts 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 (Model 3730)

Activate/deactivate the alarm function.Accesses
the value of the alarm setpoint when in
programming mode.

MEM (Model 3730)

Activate the memory function or read the stored
values in MR (Memory Recall). Clears
the memory when in programming mode.

Product Construction

The Models 3710 and 3730 bodies are
built of Lexan®or equivalent for rugged
use.The probe heads are encapsu­lated in a double-walled shell
for extra strength and
reinforced for enhanced
field
reliability.
Overall
construction
and mechanical
design ratings such
as drop test, shock and
vibration, weatherproofing
against water projections
or dust, meet or
exceed IEC-1010 Cat. III
standards.These products
have also been designed to meet UL,
CSA and GS safety approvals, and are CE marked.

The probe head, or jaw , is a k e y component in the measurement and o v er­all product performance.

The large jaw thickness permits use on tight ground conductors on poles
and in manholes. The 1.25" (32 mm) opening accommodates not only
ground rods, but larger ground conductors (up to 1000 MCM) 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 repetitive jaw align­ment for accuracy and pre­vents undesirable insertions
into the jaw spring assembly.

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.

+
–

Ω

▲

▲

Buttons

MR

Functions & Features

3710 3730

Ohms Range YES YES
Amperes (TRMS) Range YES YES
Hold Function YES YES
Self Test @ Power Up YES YES
Auto Off YES YES
LCD Battery Life Indicator YES YES
LCD Noise Indicator YES YES
LCD Open Jaw Indicator YES YES
LCD Closed Loop Indicator YES YES
Multi-Tone Beeper YES YES
Alarm Function — YES
Memory (Logging) Function — YES

Specifications

Chauvin Arnoux, Inc. d.b .a.AEMC®Instruments · 99 Chauncy St.· Boston, MA 02111 USA · [phone] · [phone] · Fax [phone]

Visit our website at www.aemc.com

Call the AEMC®Instruments Technical Assistance Hotline for immediate consultation with an applications engineer: [phone]

950.BR - 3710/30 05/99

ORDERING INFORMATION CATALOG NO.

Clamp-on Ground Resistance Tester Model 3710. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cat. #1221.01

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

Clamp-on Ground Resistance Tester Model 3730. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cat. #1221.02

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

Operating Humidity: 0 to 90% RH @
14°F to 104°F (-10°C to 40°C),
75% RH @ 131°F (55°C)

Storage Temperature:

-40°F to 158°F (-40°C to 70°C)

LCD: 3 3/4 Digit, 1.73" x 1.10" (44 x 28 mm)
U.S. Patent: No. 362,639
NSN: 6625-01-377-8030

Measurement

Range

Range

1.0 to 50.0Ω

50.0 to 100.0Ω
100 to 200Ω
200 to 400Ω
400 to 600Ω

600 to 1200Ω

1 to 300mA

0.300A to 3.000A

3.00A to 30.00A

Resolution

0.1Ω

0.5Ω
1Ω
5Ω

10Ω
50Ω

1mA

0.001A

0.01A

Accuracy*

± (1.5% + 0.1Ω)
± (2.0% + 0.5Ω)

± (3.0% + 1Ω)
± (6.0% + 5Ω)

± (10% + 10Ω)

n/a

± (2.5% + 2mA)
± (2.5% + 2mA)

± (2.5% + 20mA)

GROUND OR LEAKAGE CURRENT

GROUND RESISTANCE

Carrying Case (included)

* Reference conditions:23°C ± 3K, 50% RH ± 10%, battery at 8V ± 0.2V, external magnetic field
< 40 A/m, external electrical field < 1 V/m, conductor centered, loop resistance noninductive.Accuracy % of
reading.

ELECTRICAL

Resistance Measurement Frequency:

1.689kHz

Current Measurement Frequency:

47 to 800Hz

Current Overload:

OL displayed above 30Arms
Power Supply:9V Alkaline batter y

(IEC 6LF22 or NEDA 1604A)
Battery Life: typical: 8 hours or approx.

1,000 measurements of 30 seconds

SAFETY

UL, CSA, GS Listed
IEC 1010-2-032 Double Insulation
Environmental:

IP30, IEC 359 Group III

Vibration Test: IEC 68-2-6
Shock T est: IEC 68-2-27
Drop T est (1m): IEC 68-2-32
Dielectric Test: 2500VAC
Working Voltage:

IEC1010 150V, Cat. III - Pollution Degree 2
IEC1010 300V, Cat. III - Pollution Degree 1

Max Overload (A or Ω Function):

100A continuous, 200A (<5s) 50/60Hz

MECHANICAL

Dimensions:

9.25" x 3.94" x 2.17"

(235 mm x 100 mm x 55 mm)
Weight: 2.2 lbs.(1 kg)
Case Material: Lexan®920A (UL94V2)

Jaw Cover Material: Lexan®500R with

10% fiberglass charge (UL94V0)

LCD Cover Material:

Lexan®920A (UL94V1)

Color: Gray body, red jaws
Jaw Window Diameter: 1.25" (32 mm)
Jaw Opening: 1.38" (35 mm)
Operating Temperature:

14°F to 131°F (-10° to 55°C)

Calibration Check Loop (included)

Autoranging

1.0 to 1200Ω

Autoranging

1mA to 30.00

Arms