Chauvin Arnoux C.A 6470N TERCA 3 Manuel utilisateur

ENGLISH Overview

Earth and resistivity tester

C.A6470N

WARNING - risk of DANGER! Read the user’s manual.

In these operating instructions, failure to follow or carry out instructions preceded by this

symbol may result in personal injury or damage to the device and the installations.

Instrument fully protected by double insulation or reinforced insulation.

The rubbish bin with a line through it means that in the European Union, the product must

undergo selective disposal for the recycling of electric and electronic material, in compliance

with Directive WEEE 2002/96/EC.

Earth terminal.

DEFINITION OF MEASUREMENT CATEGORIES

Measurement category IV corresponds to measurements taken at the source of low-voltage

installations.

Measurement category III corresponds to measurements on building installations.

Measurement category II corresponds to measurements taken on circuits directly connected to

low-voltage installations.

Measurement category I corresponds to measurements taken on circuits not directly connected

to the network.

Thank you for purchasing a C.A 6470N earth and resistivity tester.

To obtain the best service from your unit:

read these operating instructions carefully,

comply with the precautions for use, that is to say, temperature, humidity, altitude, degree of

pollution and site of use.



INTRODUCTION

This is an overview of the complete C.A 6470N user manual which enables the user to easily ﬁnd:

The rules for using the instrument,

The operation of keys and measurement setting conﬁguration,

The general conﬁguration of the instrument,

The meaning of alarm indicators,

The meaning of the various error codes,

A glossary lists the terms and abbreviations used on the instrument and the digital display.

RULES FOR USE



1. CHARACTERISTICS LABEL

Stick one of the 5 characteristics labels supplied, in the appropriate language, inside the instrument

lid.

2. INSTRUMENT FUNCTIONS

The instrument is designed and made for the veriﬁcation and measurement of the various electrical

parameters of earthing installations.

As an instrument powered by 8 x 1.2 V rechargeable internal batteries, with a maximum voltage output

of 16 V or 32 V, as required, the tester is not dangerous for the user. The instrument meets the safety

criteria of standards IEC 61010-1, 61010-2-31&32 and IEC 61557, parts 1, 4 and 5 subject to the

following conditions:

Maximum altitude for use: 3,000 m

Use: indoor or outdoor

Max. voltage relative to earth: 50 V

Installation category: IV

Pollution level: 2

Maximum differential voltage at inputs : 75 Vrms

Maximum short-term voltage: 250 Vrms (on any 2 of the 4 inputs)

The tester also meets standards IEC 60479-1, -2 and –3 and IEC 61326-1. Between the H and E inputs,

the instrument is protected by a 0.63 A, 250 V, 5 x 20 mm fast fuse with high 1.5 kA cutout power.

If voltages over 42 V are present on inputs, the warning symbol appears and ﬂashes on the top

left of the display.



3 - PRECAUTIONS FOR USE

This measuring instrument should be used by personnel trained in the functions of the instrument,

as well as in the safety rules and standards applicable to its use. This rule also applies to the use of

accessories made by other manufacturers.

If there is a suspicion that use of the appliance may be dangerous for the operator, the instrument must

be taken out of service, making accidental use impossible. This is particularly true if the instrument:

Shows visible sign of deterioration,

Does not work properly,

Has been exposed to climatic conditions not within speciﬁcations,

Has been subjected to signiﬁcant mechanical stress.

For safety reasons,

Only use accessories, the overvoltage category and assigned voltage of which are at least equal to

or higher than those of the instrument (EN 61010-2-031 and 32).

Only use the mains adapter unit supplied with the instrument to recharge the battery; this is adapted

to charging conditions and meets overvoltage category II requirements ensuring the user's safety

from an electrical standpoint. To obtain the best use from your battery and prolong its efﬁciency:

Only charge the instrument between 0° and +40°C.

Comply with the conditions for use deﬁned in the user manual.

Comply with the conditions for storage deﬁned in the user manual.

Do not use the instrument if its accessories appear damaged.

Apart from the applications speciﬁed, never measure resistance on a powered-up circuit or with a

link to the electricity network maintained.

Never exceed the protection limits indicated in the speciﬁcations.

In general, boots, gloves and insulated mats should be used.

The equipotentiality of the various locations of the stakes used to measure the earth may be

compromised if there are major faults on nearby electrical installations or in certain meteorological

conditions (stormy weather). It is up to the operator to judge whether to continue with or postpone a

measurement campaign for each situation.

Using a speciﬁc power unit, the C.A 6470N can also be recharged from a 12 VDC socket in a vehicle.

In this case, the low point of the vehicle 12 VDC socket is located at the potential of the E and ES inputs

of the instruments. For safety reasons, the instrument must not be used or connected to this power

supply unit if the presence of voltage in excess of 32V is suspected on these inputs.

4. MAINTENANCE

For maintenance, use only the speciﬁed spare parts. The manufacturer cannot accept any responsibility

for accidents occurring following repairs carried out outside its after-sales department or approved

maintenance network.

Changing the battery:

The battery for this instrument is speciﬁc: it contains precisely adapted protection and safety elements.

Failure to replace the battery with the speciﬁed model may lead to material damage and bodily injury

due to explosion or ﬁre. To ensure continued safety, only replace the battery with the original model

deﬁned in the user manual.

If the battery is changed, the following safety instructions must be adhered to:

Never short-circuit the positive and negative poles.



Never dismantle the battery and its cells.

Never incinerate or expose to heat sources.

Never clean with water or corrosive agents.

Never use the battery if it shows signs of leakage or mechanical deterioration.

Collect used batteries for recycling within the framework of protection of the environment.

To ensure continued safety, only replace a faulty fuse by a fuse with characteristics that are strictly

identical to those deﬁned in the user manual.

OPERATING PRINCIPLE

The device has 2 operating modes:

Automatic mode for routine applications,

Manual/Expert mode in which the user can change the parameters of the measurement functions.

1. AUTOMATIC MODE

Set the switch to the desired function,

Make the connections appropriate to the function,

Press the START button. The device makes the measurement and stops automatically.

Read the measurement result on the display unit and the relevant parameters using the DISPLAY

key. You can record all of this information in the internal memory of the device.

2. MANUAL OR EXPERT MODE

Set the switch to the desired function,

Make the connections appropriate to the function,

Select “MANUAL” mode.

Choose the various measurement parameters using the CONFIG key.

Press the START button. The measurement frequency or the direction of the current (resistance

measurement) can be changed during the measurement to view their impact upon the measurement

and the parameters relevant to the measurement can be viewed using the DISPLAY key.

When the measurement results are acceptable, stop the measurement by pressing the STOP

button.

View the result on the display and toggle through the relevant parameters using the DISPLAY key.

You can save all of this information to the internal memory of the device.

FUNCTIONS OF KEYS

The primary functions of keys are indicated above the keys in white.

The secondary key functions (indicated in yellow italics beneath them) are accessible by pressing then

releasing the yellow key then the relevant key. The same operation is used to return to the primary

function.



2nd Activation /deactivation of the secondary key function. The symbol 2nd is displayed

on the screen.

CONFIG/

FREQUENCY

Setting measurement parameters before measuring:

mΩ

AUTO – 2 wire/4 wire measurement

MANU – 2 wire/4 wire measurement – measurement current ﬂow

direction

3 poles AUTO – UOUT

MANU – UOUT – measuring frequency – coupling (EARTH COUPLING)

4 poles AUTO – UOUT

MANU – UOUT – measuring frequency

ρAUTO – measuring method - UOUT

MANU – measuring method – UOUT – measuring frequency

Setting measurement parameters during measurement in MANUAL mode:

All functions except mΩ : measuring frequency

mΩ: measurement current ﬂow direction



DISTANCE Only when measuring ground resistivity (ρ), programming distances Aand/or d,

before or after measurement.

DISPLAY Display of the various screens and results available in roll mode.

Exit of the memory function without recording.

SMOOTH Activation / deactivation of the smoothing of measurement display.

MEM

Memorisation of a measurement and all the information relating to an address deﬁned

by an object number (OBJ.) and test number (TEST).

An index for the following functions is automatically associated with the test

number:

1, 2, 3, 4 for coupling measurements (EARTH COUPLING).

DISTANCE for resistivity (ρ)

MEM needs to be pressed twice:

1st press: conﬁrmation of the memorisation address (can be changed with the

and keys).

2nd press: memorisation at the chosen address



Reading of the values memorised.

The address (OBJ./TEST) and, as applicable, the associated index, are selected with

the and keys.

All the information linked to the recalled measurement can be displayed with the

DISPLAY key.

Selects the parameter to be modiﬁed (in roll mode, from left to right).

The modiﬁable parameter ﬂashes.

Incrementation in roll mode of the value of the ﬂashing parameter selected.

Decrementation in roll mode of the value of the ﬂashing parameter selected.

OPERATING MODES

The instrument has 3 measurement modes:

AUTO mode: Measurement is activated by pressing the START/STOP key and measurement frequency

selection is automatic. Measurement stops as soon as the results are available on the

display.

MANUAL mode: Measurement is activated by the START/STOP key and stopped by pressing the

START/STOP key again. The operator can modify measurement frequency during

measurement without it being stopped.

SET-UP MODE

Modiﬁable parameters Command keys Values possible Default value

Distances unit DISPLAY (1st press) m (metres) or ft (feet) m

mΩalarm measure (2 wires) DISPLAY (2nd press)

ON / OFF

direction ( > or < )

value (1…999 Ω)

OFF > 2 Ω

Buzzer DISPLAY (3rd press) ON / OFF ON

Modbus address DISPLAY (4th press) 1…247 1

Date CONFIG (1st press) yyyy.mm.dd current date

Time CONFIG (2nd press) hh.mn current time

Communication speed

(Bauds) CONFIG (3rd press) 9.6k / 19.2k / 38.4k 38.4k

Conﬁguration by default CONFIG (4th press) Yes / no Yes

Memory occupied MEM

xxx out of 512 (total

possible number of

locations)

Display of the instrument serial number and software version: Hold down the CONFIG key while

turning the rotary switch on the "SET-UP" position.

Viewing all the display segments: Hold down the DISPLAY key while turning the rotary switch on the "SET-

UP" position.

INDICATORS OF LIMITS OF USE

After the measurement has started there are indicators of when:

The values RHand/or RSare too high

The measurement current IH-E is too low

Measurement instability is high

Those conditions that may give uncertain results are indicated on the display of the unit as follows:

Functions Triggering threshold Indication on the display

3P, 4P, ρIH-E < 1 mA ﬂashes (2)

ﬂashes

All RS> 30 kΩﬂashes (2)

ﬂashes

All

Values measured (U, I, R) unstable,

varying by more than 5% of their

average value. (1)

ﬁxed (2)

ﬂashes

All US-ES, US-E, UH-E > 42 V ﬂashes (2)

All

Spurious voltage of which the

frequency and/or value is likely to

interfere with the measurement.

NOISE

(3)

(1) Not active if the SMOOTH function is selected.

(2) The symbol may also appear if there is an external voltage > 42 V on the terminals of the

device.

(3) You should change to manual mode and modify the measurement voltage and/or frequency to

make a valid measurement (when the NOISE symbol is no longer illuminated).



LIST OF CODED ERRORS

On initial operation, the C.A 6470N automatically runs a self-diagnosis. If a fault appears during self-

diagnosis or measurement, the instrument displays a message in the format Err XX.

These errors are classiﬁed into 3 categories:

Not serious Errors 6, 7 and 11

The message is displayed for around 1 second to inform the user. Envisage repair

if the error recurs.

Recoverable Errors 5, 14, 15, 18, 19, 30, 31, 32 and 33

The error concerns the measurement function in process and disappears if the

function is changed. The instrument can therefore be used but will need to be

repaired if the error persists.

Special cases:

An 18 error indicates it is impossible to recharge the internal battery of the

instrument. If an 18 error is declared while the battery is being recharged and

remains present once the instrument has been started again, stop recharging

and replace the battery.

In the event of a 19 error, erasing the instrument memory may remove this

error.

For errors 31, 32 and 33, excessively high voltage or current appeared during

measurement. Check the measurement circuit.

Fatal Errors 0, 1, 2, 3, 8, 12, 13, 15, 16, 18 (when recharging batteries) and 21

These errors stop the instrument from working. Stop the instrument and start it

again. If the error persists, the instrument needs to be repaired.



GLOSSARY

This glossary lists the terms and abbreviations used on the device and its digital display unit.

3 poles: earth resistance measurement with 2 auxiliary electrodes (3P).

4 poles: 4-wire measurement of low earth resistance using 2 auxiliary electrodes (4P).

C1: coupling coefﬁcient of earth RAwith earth Rb(C1= RC/R1 ).

C2: coupling coefﬁcient of earth Rbwith earth RA(C2= RC/R2 ).

d, A: distances to be programmed for the resistivity calculation depending on the

measurement method used.

mΩ: low resistance/continuity measurement.

E: terminal E (earth electrode, measurement current return terminal)

EARTH: earth measurement (3-pole or 4-pole).

EARTH COUPLING: measurement of coupling between 2 earth electrodes.

ES: terminal ES (acquisition of reference potential for the 4P earth resistance

calculation).

H: terminal H (measurement current injection terminal).

IH-E: measurement current ﬂowing between terminals H and E.

NOISE: indicates that a spurious external voltage is present and interfering with the earth

or resistivity measurement.

R: mean resistance calculated from R+ and R-.

R+: resistance measured with a positive current ﬂowing from terminal H to terminal E.

R-: resistance measured with a negative current ﬂowing from terminal H to terminal E.

R1: first value measured to calculate the coupling between 2 earth electrodes

(R1= RA+ RC ).

R2: second value measured to calculate the coupling between 2 earth electrodes

(R2= Rb+ RC ).

R1-2: third value measured to calculate the coupling between 2 earth electrodes

(R1-2 = RA+ Rb ).

RA: ﬁrst earth value calculated (RA= R1- RC ).

Rb: second earth value calculated (Rb= R1- RC ).

RC: coupling resistance between earths RAand Rb(RC= (R1+ R2- R1-2 )/2).

RE: resistance of the earth connected between terminal E and electrode S.

RH: resistance of the electrode connected to terminal H.

RS: resistance of the electrode connected to terminal S.

RS-ES (2): resistance between electrodes S and ES (used for the resistivity measurement).

R∆0: measurement leads compensation resistance.

S: terminal S (acquisition of measurement potential for the earth resistance

calculation).

U-Act (1): present (Act) external voltage on the terminals of the device.

UH-E: voltage measured between terminals H and E.

UOUT: voltage generated by the device between its terminals H and E (32V or 16V).

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