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.