Atec AEMC-6472, AEMC-6474 User Manual

Models 6472 & 6474

Reliable, accurate and quick for comprehensive

Reliable, accurate and quick for comprehensive

earth testing

earth testing

MULTI-FUNCTION

MULTI-FUNCTION

Earth and

All types of earth resistance measurements:

•

and earth measurement on pylons (C.A. 6474 option)

Resistivity (Wenner and Schlumberger methods)

•

Earth coupling

•

Ground potential measurement

•

Continuity / resistance

•

HIGH PERFORMANCE

HIGH PERFORMANCE

Possibility of analysing the frequency behaviour

•

of earthing systems (41 Hz to 5 kHz)

Wide measurement range for optimum resolution

•

Rejection of interference voltages up to 60 Vpeak

•

Automatic calculation of the earth coupling coefficient

•

and ground resistivity

Measurement and analysis of pylon earthing

•

Recording of results

•

resistivity tester

Adapter for

pylon earth

measurements

A versatile instrument

The Model 6472 earth and resistivity tester can be used for
quick, comprehensive testing of all earthing systems by
gathering all the earth measurement functions in a single
instrument. When used with the Model 6474, it also offers
pylon earth measurements, making it an essential tool for
diagnosing and maintaining the earthing systems of all
types of pylons.

2 operating modes for easy learning

New measurement concept

Unlike traditional earth testers, the Model 6472 offers
the possibility of analysing the frequency behaviour of earthing
systems thanks to its particularly extensive measurement
frequency range (from 41 to 5,078 Hz).
The use of a high-frequency measurement signal makes
it possible to assess the behaviour of an earthing system in the
event of lightning.

Automatic mode:

A single key for simple handling:

- function selection by rotary
switch

- press on START / STOP button

- reading of the result

In this mode, the instrument
carries out a default measurement
at 128 Hz and chooses the most
appropriate frequency in the event
of interference voltages.

4P MEASUREMENT METHOD

Do not connect the black cable
if using the 3P method

Expert mode:

Users can choose the required measurement parameters
(specific measurement frequency, frequency scan,
measurement voltage between H and S, etc.) and can access
additional measurement results for more accurate interpretation.

Automatic recognition of input
connections:

the connections are displayed
and flash if incorrect or absent.

3P EARTH MEASUREMENT
METHOD

The 3P method is the traditional method using rods to
measure the resistance of an existing earth connection.
The Model 6472 can also be used to measure the resistances
of the auxiliary rods RS and RH, as well as any interference
voltages, thus allowing more accurate interpretation of the
measurement.

Suitable for all types of measurement environments,

even the most difficult, it guarantees measurement of auxiliary
rod resistances up to 100 kø and interference voltages up
to 60 Vpeak.

4P AND 4P SELECTIVE MEASUREMENT

The 4P measurement method is particularly well-suited to measuring very low earth resistance values.
In the event of several resistances set up in parallel, it is possible to combine this method with a clamp-on ammeter in
order to carry out selective measurements. This "4P selective" method saves considerable time as it is no longer necessary
to disconnect the earth resistance to be measured. Indeed, the clamp enables measurement of the current through the
earth connection to be tested, thus avoiding the influence of the parallel earth connections.

EARTH LOOP MEASUREMENT
WITH 2 CLAMPS

In the event of a system with parallel earth connections, the Model 6472 is capable
of accurately measuring an earth resistance using clamps only. The principle of this
method involves placing 2 clamps around the earth conductor to be tested and
connecting them each to the instrument. One clamp injects a known signal ( 32 V / 1367 Hz) while the other clamp measures the current
circulating in the loop. This method saves considerable time when earth testing because it is no longer necessary to set up auxiliary rods
or to disconnect the earth connections.

EARTH COUPLING MEASUREMENT

The operator performs 3 successive measurements (2 traditional earth measurements using the 3P method – R1 & R2 – and 1 earth
measurement using the 2P method – R

1-2). The Model 6472 then automatically calculates the coupling resistance: Rc = (R1 + R2 – R1-2) / 2.

R

S

R

H

E

S

H

ES

1
2
3
4

C.A 6474

C.A 6472

WENNER METHOD

GROUND RESISTIVITY
MEASUREMENT

Wenner method:

the distances between
the 4 rods are identical:
d ρW = 2.π.d.R

SCHLUMBERGER METHOD

Schlumberger method:

the distance between
the 2 central rods S & ES
is A
the distance between
the 2 outside rods E & H
is 2d

2-A2

ρS = (π.(d

GROUND POTENTIAL MEASUREMENT

This measurement can be used to determine the value of the potential as a
function of distance. By performing several measurements with different
distances (d), it is thus possible to track the change in potential around
an earthing system.

S-SE

/4).RS-SE) /4

When it is possible to choose the
position of the earth connection,
resistivity measurement helps to assess
the ground and thus determine the place
where the earth resistance will be lowest
(optimization of construction costs).

The Model 6472 automatically calculates
the resistivity of the ground (ρ) using the
Wenner or Schlumberger method, as
soon as the distances used between the
rods have been entered. The resistances
of the rods R

E, RES, RS and RH can also be

measured.

EARTH SYSTEM

EARTH MEASUREMENT ON PYLONS WITH EARTH CABLE

High-voltage lines are usually equipped with an earth cable to
allow lightning to discharge to earth via the pylons. As all the
pylons are connected to this conductor, all the pylons' earth
resistances are in parallel. This means that it is impossible to
measure pylon resistance using traditional 3P methods unless
the earth cable is disconnected, which is a dangerous and
time-consuming operation.

pylon in question.
With 4 current sensors (Ampflex) positioned around the footings of the pylon and a
frequency scan up to 5 kHz, it is possible to measure the earth impedance of the pylon
precisely and selectively.
Furthermore, the use of flexible sensors means that this concept can be adapted
to any pylon geometry.

A single measurement is sufficient to acquire all the essential quantities:
– overall earth resistance of the line
– resistance of the pylon under consideration
– resistance of each pylon footing
– resistance of the earth cable between pylons

Model 6472 offers the possibility of measuring a pylon's earth resistance even

if it is part of a parallel earth network, by selective measurement of the

High Voltage

Reference

Used in conjunction with the Model 6474 vectorial processing unit, the

Earth cable

Line

potential

4 Ampflex channels connected

Current

injection

rod

Auxiliary

electrode

Resistivity

Range

Resolution

Accuracy

No-Load Voltage

Measurement Frequency

Coupling Measurement

Auxiliary Rod Resistance
Measurement

Voltage Interference

Test Method

Type of Measurement

Measurement Current

4P / 4P

Selective Method

Earth Measurement

with 2 Clamps

Earth Potential

Measurement

DC Resistance
Measurement

Measurements

with C.A 6474

MECHANICAL SPECIFICATIONS

272x250x128 mm / C.A 6472: 3.2 kg / C.A 6474: 2.3 kg

Dimensions / Weight

Memory/Communication

IP 53

Protection Rating

CAT IV 50 V, complies with IEC 61326-1 / IEC 61010 / IEC 61557-1-4-5

512-record memory / optical link/USB

Electrical Safety

ELECTRICAL SPECIFICATIONS

3P Method

ORDERING INFORMATION

0.01 Ω to 99.9 kΩ 0.001 Ω to 99.99 Ω 0.01 Ω to 500 Ω 0.01 kΩ to 99.9 kΩ 0.01 mV to 65.00 V 0.001 Ω to 99.9 kΩ 0.001 Ω to 99.99 kΩ

± (2% + 1 count) ± (2% + 1 count) ± (10% + 1 count) ± (2% + 1 count) ± (5% + 1 count) ± (2% + 2 counts) ± (5% + 1count)

16 or 32Vrms 16 or 32 Vrms 16 or 32 Vrms 16 or 32Vrms 16 or 32 Vrms ±16 VDC 16 or 32 Vrms

yes – – – – – –

0.1 Ω to 100 kΩ 0.01 Ω to 100 kΩ – – – – 0.01 Ω to 100 kΩ

– – –

Wenner and

Schlumberger with

automatic calculation

– – –

3 wires 4 wires – 4 wires 3 wires 2 wires or 4 wires –

– – – – – > 200 mA DC –

maximum 60 Vpeak – maximum 60 Vpeak

41 to 5,078 Hz 41 to 5,078 Hz

Auto: 1,367 Hz

Manual: 1,367 Hz,

1,611 Hz, 1,758 Hz

41 to 128 Hz 41 to 128 Hz DC 41 to 5078 Hz

0.01 to 100 Ω 0.001 to 10 Ω 0.01 to 1 Ω 0.01 to 100 Ω 0.01 mV to 10 mV

2 wires: 0.01 Ω

to 100 Ω/

4 wires: 0.001 Ω

to 10 Ω

0.001 to 10 Ω

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

Export Department: [phone] • Fax [phone] • E-mail: [e-mail]

Chauvin Arnoux®, Inc. d.b.a AEMC® Instruments • 200 Foxborough Blvd. • Foxborough, MA 02035 USA • [phone] • [phone] • Fax [phone]

Visit our website at www.aemc.com 950.BR-6472-74_0608Rev01 Printed in the USA

Chauvin Arnoux One Source

™

Ground Resistance Tester Model 6472 ..............................................................................................Cat. #2135.51

Includes rechargeable NiMH batteries, optical USB cable, power adapter 110/240V with power cord 115V US, DataView® software, ground tester workbook CD,
carrying bag for meter, product warranty and registration card and a user manual.

Ground Resistance Tester Model 6472 Kit (150 ft) ....................................................................................Cat. #2135.52

Includes meter, rechargeable NiMH batteries, optical USB cable, power adapter 110/240V with power cord 115V US, two 150 ft color-coded leads on spools (red/blue),
one 30 ft lead (green), two T-shaped auxiliary ground electrodes, set of five spaded lugs, one 100 ft AEMC
CD, carrying bag for meter, carrying bag for kit, product warranty and registration card and a user manual.

Ground Resistance Tester Model 6472 Kit (300 ft) ....................................................................................Cat. #2135.53

Includes meter, rechargeable NiMH batteries, optical USB cable, power adapter 110/240V with power cord 115V US, two 300 ft color-coded leads on spools (red/blue),
two 100 ft color-coded leads (hand-tied, green/black), four T-shaped auxiliary ground electrodes, set of five spaded lugs, one 100 ft AEMC
software, ground tester workbook CD, carrying bag for meter, carrying bag for kit, product warranty and registration card and a user manual.

Ground Resistance Tester Model 6472 Kit (500 ft) ....................................................................................Cat. #2135.54

Includes meter, rechargeable NiMH batteries, optical USB cable, power adapter 110/240V with power cord 115V US, two 500 ft color-coded leads on spools (red/blue),
two 100 ft color-coded leads (hand-tied, green/black), one 30 ft lead (green), four T-shaped auxiliary ground electrodes, set of five spaded lugs, one 100 ft AEMC® tape
measure, DataView® software, ground tester workbook CD, carrying bag for meter, carrying bag for kit, product warranty and registration card and a user manual.

GroundFlexTM Adapter Model 6474 .................................................................................................Cat. #2136.01

Includes GroundFlex™ Adapter Model 6474, four GroundFlex™ sensors (5m) with twelve color-coded rings, rechargeable NiMH batteries, connection lead,
two extension leads on H reel (black/green) with color-coded alligator clips, six BNC extension leads, calibration loop, three C-clamps, carrying case for meter
and a user manual.

GroundFlex

Includes Cat. #2136.01 and Cat. #2135.54.

TM

Field Kit (Models 6472 and 6474) .......................................................................................Cat. #2136.03

®

tape measure, DataView® software, ground tester workbook

®

tape measure, DataView®

factory supplied product only (not available through distribution)

NOTE: The GroundFlexTM Adapter Model 6474 is a