Chauvin Arnoux C.A 6474 User manual

Adapter for pylon ground resistance
measurement
GB - User’s manual
C.A 6474

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WARNING, risk of DANGER! The operator must refer to these instructions whenever this
danger symbol appears.
Equipment protected by double insulation.
Earth.
CE marking indicates conformity with European directives, in particular LVD and EMC.
The rubbish bin with a line through it indicates that, in the European Union, the product must
undergo selective disposal in compliance with Directive WEEE 2002/96/EC. This equipment
must not be treated as household waste.
Definition of measurement categories
Measurement category IV corresponds to measurements taken at the source of low-voltage installations.
Example: power feeders, counters and protection devices.
Measurement category III corresponds to measurements on building installations.
Example: distribution panel, circuit-breakers, machines or fixed industrial devices.
Measurement category II corresponds to measurements taken on circuits directly connected to low-
voltage installations.
Example: power supply to electro-domestic devices and portable tools.
PRECAUTIONS FOR USE
Only use the accessories supplied with the C.A 6474.
Do not use the C.A 6474 or its accessories if they appear damaged.
Never exceed the protection limit values indicated in the specication or those indicated for the
C.A 6472.
The connection of current sensor leads is the last operation to be carried out before starting
measurement. Disconnection of these leads from the instrument is the rst operation to be carried
out once measurement is nished.
In general, boots, gloves and insulated mats should be used.
Thank you for purchasing this C.A. 6474 adapter for pylon ground resistance measurement.
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.

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CONTENTS
1. INITIAL OPERATION......................................................................................................................4
1.1. Verication of the contents ..................................................................................................4
1.2. Accessories .........................................................................................................................5
1.3. Spares .................................................................................................................................5
1.4. Characteristics label ...........................................................................................................6
2. PRESENTATION OF THE INSTRUMENT ......................................................................................7
3. PROCEDURE .................................................................................................................................9
4. TECHNICAL CHARACTERISTICS ...............................................................................................9
4.1. Reference conditions........................................................................................................... 9
4.2. Environmental conditions .................................................................................................... 9
4.3. Electrical characteristics ......................................................................................................9
4.4. Compliance with international norms................................................................................. 10
4.5. Electromagnetic compatibility (EMC)................................................................................. 10
4.6. Mechanical characteristics ...............................................................................................10
5. MAINTENANCE............................................................................................................................11
5.1. Cleaning ............................................................................................................................ 11
6. WARRANTY..................................................................................................................................11

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1. INITIAL OPERATION
1.1. VERIFICATION OF THE CONTENTS
When unpacking, check that all items have been delivered in line with your order.
The instrument and accessories underwent full mechanical and electronic testing before shipment. All
necessary precautions have been taken to ensure you receive the instrument in good condition. It is
advisable to make a quick check of the equipment to ensure no damage has occurred during transportation.
In the event of damage, immediately notify the carrier of the customary reservations. If you need to ship
the instrument to another site, the original packaging should preferably be used.
x 5 x 5
C.A 6474
Notice de fonctionnement
Adaptateurpour la mesure
de terre des pylônes
FRAN Ç A I S
x 4
x 4
x 5
x 3










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1Shoulder bag that can hold the instrument and all accessories.
21 connecting lead.
This lead connects the C.A 6472 to the C.A 6474. It enables communication between the 2
instruments and powers the C.A 6474 from the C.A 6472.
34 exible current sensors (AmpFlex).
You can connect from 1 to 4 sensors on the C.A 6474 according to the earthing structure
considered. These sensors enable selective measurement of the current used to calculate the
earthing resistance value.
Check that each sensor has an identication ring to identify the input channel on the C.A 6474
to which each sensor must be connected. If not, please refer to the C.A 6472 user manual to
establish identication.
44 x BNC/BNC cables, 15 metres long.
These cables enable the sensors to be connected to the C.A 6474 up to a distance of 30 metres.
51 set of identication rings.
These rings should be mounted on BNC/BNC cables to enable the current sensor to be identied
up to the connection to the C.A 6474.
62 cables, 5 meters long, black and green.
These cables are to be used to connect the "E" and "ES" terminals of the C.A 6472 to the
structure being tested via clamps.
75 slotted tongue terminals.
2 slotted tongue terminals are to be screwed onto the above cables. The terminals are then
screwed onto the clamps to ensure the connection is stable and e󰀩cient.
83 clamps.
These clamps are equipped with a retention pin to ensure a stable electrical connection by
eliminating corrosion or paint present in the metal contact part.
91 calibration loop.
This enables the user to verify and/or calibrate the AmpFlex sensors and conrm or obtain their
identication in relation to the measurement channel used. Please refer to the C.A 6472 user
manual for the operating procedure.
10 5 user manuals and 5 characteristics labels, each in a di󰀨erent language.
1.2. ACCESSORIES
AmpFlex exible current sensors: other lengths available to order (contact your Chauvin Arnoux branch
or approved distributor).
1.3. SPARES
C.A 6474 without accessories
C.A 6472 – C.A 6474 connection lead
15 m BNC / BNC cable
5 m AmpFlex flexible current sensor for C.A 6474
Comes with a set of 12 identification rings for AmpFlex
Set of 12 identification rings for AmpFlex
Set of 3 clamps
5 m green cable for C.A 6474 (E terminal connection)
5 m black cable for C.A 6474 (ES terminal connection)
Set of 5 x 4 mm Ø slotted tongue terminal/banana plug adapters
Calibration loop for C.A 6474

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Prestige shoulder bag
For accessories and spare parts, visit our website:
www.chauvin-arnoux.com
1.4. CHARACTERISTICS LABEL
Stick one of the 5 characteristics labels supplied, in the appropriate language, inside the instrument lid.

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Connection
to C.A 6472
SENSITIVITY
NUMBER OF TURNS
INPUT
SELECTION
INPUTS
1 2 3 4
Overload
1 2
3
4
S
x
1/10
S
x
1
1.2.3.4
1.2.3
1.2
S
x 10
1 2 3 4
50V CATIV
C.A 6474
PYLON BOX
Selection of the sensitivity
AmpFLEX
C.A 6474
PYLON BOX
C.A 6472
GROUND TESTER
Selection of the number of turns
Selection of the measurement channels
Overload LED
Connection terminals
Connection onto the C.A 6472
2. PRESENTATION OF THE INSTRUMENT

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This adapter has been designed for use with the C.A 6472 earth tester. It enables the earthing of electricity
pylons to be measured and veried and, in general, any earthing of a system by a bulky structure, the
earthing of which cannot be measured by classic means.

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3. PROCEDURE
Use of the C.A 6474 adapter and accessories, associated with the C.A 6472, is described in detail in the
C.A 6472 user manual.
4. TECHNICAL CHARACTERISTICS
4.1. REFERENCE CONDITIONS
Inuence quantities Reference values
Temperature 20 ± 3 °C
Relative humidity 45 to 55% RH
Supply voltage (1) 9 to 11.2 V
Input signal frequency range 45 to 450 Hz
Electrical eld < 1 V/m
Magnetic eld < 40 A/m
(1) This supply voltage is provided by the C.A 6472 to which the C.A 6474 is connected.
4.2. ENVIRONMENTAL CONDITIONS
For indoor and outdoor use.
Range of use 0 to +50 °C 0 to 75% RH
Storage (without battery) -40 to +70 °C 0 to 90% RH
Altitude < 3,000 m
Degree of pollution 2
4.3. ELECTRICAL CHARACTERISTICS
Operating range 1 mA to 100 A AC
Specied measurement range 10 mA to 100 A AC
Operating frequency: 41 to 5078 Hz
Characteristics of AmpFlex sensors 0.94 µV/A.Hz i.e. 47 µV/A at 50 Hz
Measurement accuracy values 2% of the reading ± 0.5 mA or 2mA (the higher of the 2)
(after calibration) in the range 45 to 450 Hz
Transfer ratio according to the sensitivity chosen (± 15%):
S x 10 1.6 V/A (1.6 mV/mA)
S x 1 0.157 V/A (157 µV/mA)
S x 1/10 12.2 mV/A (12.2 µV/mA)
The complete characteristics of the C.A 6474 associated with the C.A 6472 are indicated in the C.A
6472 user manual.

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4.4. COMPLIANCE WITH INTERNATIONAL NORMS
The voltages used for this accessory are not dangerous for the user. The C.A 6474 associated with the
C.A 6472 satises the security criteria of the IEC 61010-1 standard, IEC 61010, IEC 61557 parts 1, 4, 5.
Assigned characteristics: measurement category IV, 50 V in relation to the earth, maximum voltage of
15 V on inputs.
4.5. ELECTROMAGNETIC COMPATIBILITY (EMC)
The C.A 6474, associated with the C.A 6472, complies with EMC and LVD (low voltage) directives
necessary for EC marking, as well as with the IEC 61326-1 standard:
Emission of interference in residential environments
Immunity to interference in industrial environments
4.6. MECHANICAL CHARACTERISTICS
Dimensions (L x W x H) 273 x 247 x 128 mm
Weight approx. 2.3 kg
Protection index IP 53 per IEC 60529
IK 04 as per IEC 50102