AEMC 3710 Manual de usuario

Clamp-On

Ground Resistance Testers

Models 3710 and 3730

USER MANUAL

Chauvin Arnoux, Inc. d.b.a. AEMC®

Instruments

99-MAN-100061 Rev 05 03/98

Clamp-On

Ground Resistance Testers

Models 3710 and 3730

USER MANUAL

HOLD

—

HOLD

MEM

NOISE

Model 3710

GROUND TESTER

AEMC

INSTRUMENTS

AΩON

OFF

HOLD

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HOLD

MEM

NOISE

Model 3730

GROUND TESTER

AEMC

INSTRUMENTS

MEM AL A ΩON

OFF

Owner’s Record

The serial number for the Model 3710 or Model 3730 is located inside

the battery compartment of the instrument. Please record this number

and purchase date for your records.

CLAMP-ON GROUND RESISTANCE TESTER MODEL 3710

CATALOG #1221.01

SERIAL #:

PURCHASE DATE:

DISTRIBUTOR:

CLAMP-ON GROUND RESISTANCE TESTER MODEL 3730

CATALOG #1221.02

SERIAL #:

PURCHASE DATE:

DISTRIBUTOR:

AEMC®Instruments

by Chauvin Arnoux, Inc.

99-MAN-100061

5th Revision

Printed 03/98

Table of Contents
Warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Receiving Your Shipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Packaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Government Orders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Mechanical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Safety Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Model 3710 Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Model 3730 Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Digital Display Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Additional Features of the Model 3730 . . . . . . . . . . . . . . . . . . .12
Function Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Programming the Alarm Setpoint . . . . . . . . . . . . . . . . . . . . . . .17
Changing the Alarm Trigger . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Memory Recall . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Clear Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Function Access Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Programming Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Principle of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Field Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Operating Reference Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Calibration Check Loop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
Commonly Asked Questions . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
Battery Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34

Table of Contents (cont.)

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35

Repair and Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36

Technical and Sales Assistance . . . . . . . . . . . . . . . . . . . . . . . . . .36

Limited Warranty . . . . . . . . . . . . . . . . . . . . . . . . . .Inside back cover

Ground Resistance Tester Models 3710/3730 3

Warning

These safety warnings are provided to ensure the safety of per-

sonnel and the proper operation of the instrument.

•The instrument must not be operated beyond its specified oper-

ating range.

• Safety is the responsibility of the operator.

•All metal objects or wires connected to the electrical system

should be assumed to be lethal until tested. Grounding systems

are no exception.

•Use extreme caution when using the instrument around ener-

gized electrical equipment.

•Never attempt to use the instrument to twist or pry the ground

electrode or ground wire away from the equipment being

grounded.

•Open and close the clamp-on jaws slowly ensuring proper

alignment.

• AEMC®Instruments considers the use of rubber gloves to be an

excellent safety practice even if the equipment is properly oper-

ated and correctly grounded.

4Ground Resistance Tester Models 3710/3730

Receiving Your Shipment

Upon receiving your shipment, be sure that the contents are consistent

with the packing list. Notify your distributor of any missing items. If the

equipment appears to be damaged, file a claim immediately with the

carrier and notify your distributor at once, giving a detailed description

of any damage. Save the damaged packing container to substantiate

your claim.

Packaging

The Clamp-On Ground Resistance Testers Model 3710 (Cat. #1221.01)

and Model 3730 (Cat. #1221.02) are shipped with a hard carrying case,

one 9 V battery (not installed), an instruction manual with warranty

registration and a calibration loop. The manual, warranty card, and cal-

ibration loop are located behind the “egg crate” foam on the inside of the

carrying case cover.

Government Orders

The Clamp-On Ground Resistance Tester Model 3710 (Cat. #1221.01)

has been issued a National Stock Number. Orders for the Model 3710

should reference NSN 6625-01-377-8030.

Accessories

One multiple calibration loop, Cat. #1223.01

Ground Resistance Tester Models 3710/3730 5

Description

Outline

The ground resistance tester Models 3710 and 3730 measure ground rod

and small grid resistance through any season, 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 performing 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 1 mA and neutral currents to 30 A

rms. This feature provides additional information which is becoming vital

as distribution ground networks carry higher levels of noise and

harmonics which affect power quality.

Both models offer battery life information at power-up and Auto-Off

for power management. Additional features are also displayed on the

large LCD to ensure precise measurements. The Buzzer and Auto-Off

features may be disabled from the push-buttons at any time.

The Model 3730 offers an Alarm function and a Memory (logging) func-

tion. In the Alarm 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.

The Memory function logs up to 99 measurements (Ohms or Amperes).

This enables the user to conduct field surveys, and to retrieve and

analyze the readings at a later time. The alarm settings and stored

memory information are saved when the ground tester is turned off.

Product Construction

The Models 3710 and 3730 body cases are built of Lexan®for rugged

use. The probe heads are encapsulated in a double-walled Lexan®shell

6Ground Resistance Tester Models 3710/3730

for extra strength and are reinforced at the body interfaces 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 (International Electrotechnical

Commission) standards. The products have also been designed to

meet IEC 1010, UL 1244, CSA and GS safety approvals .

Jaw Design

The probe head, or jaw, is a key component in the measurement and

overall product performance. Considerable research and development

were dedicated to ensuring its performance, reliability and versatility.

The large jaw has an inner opening diameter of 1.25" (32 mm) - double

its predecessor’s diameter - while retaining the same overall jaw

thickness, permitting use on tight ground conductors on poles and in

manholes. The large opening accommodates not only ground rods, but

larger ground conductors (up to 1000 MCM) typically found in telecom-

munication or railroad applications.

The inner jaw is composed of two independent and individually shielded

magnetic cores permitting the injection of a test signal and accurate

return signal 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.

Body Design

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 Lexan®body con-

struction provides strength. 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.

Lexan®is a registered trademark of General Electric Corporation.

Ground Resistance Tester Models 3710/3730 7

Electrical Specifications

* Reference conditions: 23°C ± 3K, 50% RH ± 10%, battery at 8 V ± 0.2V,

external magnetic field < 40 A/m, external electrical field < 1 V/m, conductor

centered, loop resistance noninductive. Accuracy % of reading.

Resistance Measurement Frequency: 1689 Hz

Resistance Overload: OL displayed above 1200 Ω

Current Measurement Frequency: 47 to 800 Hz

Current Overload: OL displayed above 30 A rms

MECHANICAL SPECIFICATIONS

Dimensions: 9.25 x 3.94 x 2.17" (235 x 100 x 55 mm)

Weight: 2.2 lbs. (1 kg)

Case Material: Lexan®920A (UL94V2)

Resolution

0.1 Ω

0.5 Ω

1 Ω

5 Ω

10 Ω

50 Ω

1 mA

0.001 A

0.01 A

Measurement Range

Autoranging

1.0 to 1200 Ω

Autoranging

1 mA to 30.00 A rms

Range

1.0 to 50.0 Ω

50.0 to 100.0 Ω

100 to 200 Ω

200 to 400 Ω

400 to 600 Ω

600 to 1200 Ω

1 to 300 mA

0.300 A to 3.000 A

3.00 A to 30.00 A

Accuracy*

±(1.5% + 0.1 Ω)

± (2.0% + 0.5 Ω)

± (3.0% + 1 Ω)

± (6.0% + 5 Ω)

± (10% + 10 Ω)

Approx. 25%

± (2.5% + 2 mA)

± (2.5% + 20 mA)

Ground Resistance

Ground or Leakage Current

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