Chauvin Arnoux C.A 6460, C.A 6462 User guide

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Ohmmètre de terre et de résistivitéOhmmètre de terre et de résistivité

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Ohmmètre de terre et de résistivité

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Ohmmètre de terre et de résistivitéOhmmètre de terre et de résistivité

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EarEar

th & Resistivity th & Resistivity

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Ear

th & Resistivity

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EarEar

th & Resistivity th & Resistivity

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ErEr

dungs- und Bodenwiderdungs- und Bodenwider

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Er

dungs- und Bodenwider

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ErEr

dungs- und Bodenwiderdungs- und Bodenwider

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OhmmetrOhmmetr

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Ohmmetr

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OhmmetrOhmmetr

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ÓhmetrÓhmetr

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o de tierra y de resistividado de tierra y de resistividad

Óhmetr

o de tierra y de resistividad

ÓhmetrÓhmetr

o de tierra y de resistividado de tierra y de resistividad

o di terra e di resistivitào di terra e di resistività

o di terra e di resistività

o di terra e di resistivitào di terra e di resistività

OhmmeterOhmmeter

Ohmmeter

OhmmeterOhmmeter

standsmesserstandsmesser

standsmesser

standsmesserstandsmesser

C.A 6460C.A 6460

C.A 6460

C.A 6460C.A 6460
C.A 6462C.A 6462

C.A 6462

C.A 6462C.A 6462

ENGLISH

User's manual

1

English

Meaning of symbol
Caution! Please consult the User Manual before using the device.

In this User Manual, failure to follow or carry out instructions
preceded by this symbol may result in personal injury or damage
to the device and the installations.

Meaning of symbol
This appliance is protected by double insulation or reinforced
insulation. It does not have to be connected to an earth protection
terminal for electrical safety .

Thank you for purchasing this C.A. 6460 or C.A. 6462 ohmmeter
for earth and resistivity measurement.

To obtain the best possible service from your instrument:

n read this operation manual carefully
n comply with the precautions for use.

PRECAUTIONS FOR USE

n Comply with the conditions for use: temperature, humidity,

pollution level.

n This instrument can be used on category III installations:

Category III meets severe reliability and availability
requirements, corresponding to permanent use on fixed
industrial installations (see IEC 664-1 Ed. 92).

n Only use the instruments on installations that are not live.
n T o prev ent the using mistakenly touching the terminal linked

to the mains electricity supply, you are advised to check
the voltage on the sockets bef ore connecting the instrument.

n Do not perform any measurements when the leads are

connected and the instrument’s buzzer is sounding.

n Check that all the terminals are disconnected before

replacing the fuse or the batteries (C.A 6460).

n Recharge the battery in accordance with the mains voltage

(C.A 6462).

n Make sure that you replace the battery pack (C.A 6462)

with an appropriate battery pack.

n Respect the value and type of the fuse to avoid damaging

the instrument and cancelling the warranty.

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CONTENTS

1. PRESENTATION .................................................................... 21

2. DESCRIPTION ....................................................................... 21

3. USE ........................................................................................ 23

3.1 Implementation ................................................................ 23

3.2 Earth resistance measurement ........................................ 23

3.3 Measurement of earth resistivity ...................................... 24

3.4 Measurement of coupling................................................. 25

3.5 Fault signalling ................................................................. 26

4. FUNCTIONAL CHARACTERISTICS...................................... 27

4.1 Reference conditions ....................................................... 27

4.2 Metrological properties .................................................... 27

4.2.1 Voltage detection ................................................... 27

4.2.2 Resistance............................................................. 27

4.3 Power supply ................................................................... 28

4.4 Environmental parameters ............................................... 28

4.4.1 Climatic.................................................................. 28

4.5 Construction specifications .............................................. 29

4.6 Compliance with international standards ......................... 29

4.6.1. Electromagnetic compatibility ................................ 29

4.6.2 Mechanical protection ............................................ 29

4.6.3 Variations in operating range ................................. 30

4.6.4 Typical measurements........................................... 31

4.6.5 Limits ..................................................................... 31

5. MAINTENANCE ..................................................................... 32

5.1 Servicing .......................................................................... 32

5.1.1 Replacing the batteries

or rechargeable cells (C.A 6460 only )................... 32

5.1.2 Recharging all replacing the battery (C.A. 6462) ... 32

5.1.3 Replacing the fuse ................................................. 33

5.2 Cleaning .......................................................................... 33

5.3 Storage ............................................................................ 33

5.4 Metrological verification ................................................... 34

6. WARRANTY ........................................................................... 34

7. TO ORDER ............................................................................. 35

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1. PRESENTATION

The C.A 6460 and C.A 6462 are ohmmeters equipped with
digital displays for earth and resistivity measurements in the
field.
They are particularly well-adapted to use in difficult conditions,
in the presence of interference voltages, high earth currents
or highly resistive auxiliary connections, in accordance with
standards NF EN 61010-1 + A2, NF EN 61557 parts 1 and 5,
NF EN 61326-1 + A1.

For easier handling, the instrument is equipped with:

■ a single pushbutton for activation of measurement,

■ an automatic switching system f or the measurement calibre,

■ a large-size backlit liquid crystal display,

■ three LEDs indicating the presence of faults which may

invalidate the measurement result,

■ four coloured screw terminals to simplify connection of the

leads,

■ a captive connection strap.

2. DESCRIPTION

➀

➁

➂ ➃

➄➅

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➀ Four measurement terminals marked E (X), ES (Xv), S

(Y) and H (Z)

➁ Mains socket equipped with a cover to protect it from

dust (only on C.A 6462).
Battery charge LED (only on C.A 6462); when it is lit
continuously , it indicates that the battery is being charged.
It changes colour when charging has finished.

➂ LCD display with backlighting which lights up whenever

the ➄ pushbutton is pressed.

The liquid crystal display includes the digital display of
the measured values, the related units and symbols. The
“minus” sign indicates reversal of the measurement
conditions.
The “1” sign alone on the left of the screen indicates that
the measured resistance is greater than 1999 Ω.

indicates that the power supply is too low to make

a correct measurement.

➃ Fuse holder
➄ Fleeting control measurement pushbutton used for

starting up the equipment and tripping the measurements.
As soon as the pushbutton is released, the equipment is
turned off.

➅ Three indicator lights that flash when the measurement

is not valid (see § 3.5 fault signalling).

- “FAULT” : if the current circuit resistance is too high

- “HIGH RESISTANCE” : means that the measurement

- “HIGH NOISE” : if there is too much interference in the

The equipment is also provided with a cover and a transport
handle.

if the current circuit resistance is too high
if the fuse is defective

is liable to be over-affected by
the resistance in the S.ES
voltage circuit.

S.ES voltage circuit, it means that the
electronics saturated and the
measurement is no longer valid.

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■ Buzzer

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The equipment features a buzzer which buzzes when the
terminals of the equipment are connected to a voltage source.
The sound volume is proportional to the voltage up to
approximately 30 V then becomes stable.

3. USE

3.1 Implementation

■ Connect the cords to the equipment using the forked
terminals and in compliance with the terminal colours.

■ Pay out the cords and set the stakes at the ends.

■ Connect the cords to the stakes using the alligator clips.

■ Return to the equipment, press the pushbutton and read

the measurement results.

3.2 Earth resistance measurement

To measure the earth resistance, it is advisable to use the
“62%” method (method using two stakes). This measurement
requires the use of the earth Kit components

7 to order).

rod S rod H

(see paragraph

Earth

connection

Turn off the installation power supply and disconnect it
from the earth by opening the ground terminal bar.

1. Short-circuit the terminals E and ES using the

corresponding terminal bar and connect them to the earth
point to be measured.

2. Push rod H as deep as possible into the ground at a

distance “a” from the earth to be measured.
Note: the deeper the earth the greater this distance should
be (larger area of influence). If possible , it is advisable to
have a distance “a” > 25 m

3. Inser t rod S into the ground on a line between the earth

connection E and rod H, at a distance of 62% of “a”.

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