Chauvin Arnoux C.A 6423 User manual

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■CONTRÔLEURDETERRE
■■
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■EARTHTESTER
■■
■■
■ERDUNGSPRÜFER
■■
■■
■STRUMENTODI CONTROLLO DELLA TERRA
■■
■■
■CONTROLADORDETIERRA
C.A 6423
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14
English
WARRANTY
Unless notified to the contrary, our instruments are guaranteed from any manufacturing
defect or material defect. They do not bear the specification known as the safety specification.
Our guarantee, which may not under any circumstances exceed the amount of the invoiced
price, goes no further than the repair of our faulty equipment, carriage paid to our workshops.
It is applicable for normal use of our instruments, and does not apply to damage or destruction
caused, notably by error in mounting, mechanical accident, faulty maintenance, defective
use, overload or excess voltage.
Our responsability being strictly limited to the pure and simple replacement of the faulty parts
of our equipment, the buyer expressly renounces any attempt to find us responsible for
damages or losses caused directly or indirectly.
Our guarantee is applicable for twelve (12) months after the date on which the
equipment is made available. The repair, modification or replacement of a part during the
guarantee period will not result in this guarantee being extended.
SAFETY IN USE
■Before connecting up the C.A 6423, check that no dangerous voltage is present at the
earth to be measured.
■Before opening the battery compartment, ensure that no measurement lead is connected
to the instrument.
Meaning of symbol: Warning!
Consult the User’s manual before using the instrument.
You have just acquired an Earth Tester and we thank you for your confidence.
To get the best service from your instrument:
-read carefully this user’s manual,
-respect the safety precautions in it,
-stick the label corresponding to your language on the back of the instrument.
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SUMMARY
Page
1. PRESENTATION ...................................................................................................................................................... 15
2. DESCRIPTION ........................................................................................................................................................... 16
3. OPERATINGMODE .............................................................................................................................................. 17
3.1. Measurement of resistance of an earth point .................................................................. 17
3.2. Measurement of resistance ........................................................................................................... 18
3.3. Fault signals .............................................................................................................................................. 19
4. SPECIFICATIONS ................................................................................................................................................... 20
5. MAINTENANCE ......................................................................................................................................................... 23
5.1. Normal cleaning ..................................................................................................................................... 23
5.2. Calibration check ................................................................................................................................... 24
5.3. Repair ............................................................................................................................................................ 24
6. TOORDER .................................................................................................................................................................... 25
1. PRESENTATION
Autonomous and watertight, this tester is a worksite instrument designed for earth resistance
measurements. It is particularly suited to measurements in difficult conditions such as when
there are stray voltages present, high telluric currents, high value auxiliary electrode
resistances, etc...
For ease of use, this instrument has the following features:
■a single press button to trigger the measurement
■an autoranging system for measurement range switching
■a large digital display which is readable even in shadow
■ three indicators that signal the presence of faults which can lead to errors during measurement
■three colour coded screw terminals to simplify connection of leads
■an attached connection rod
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2. DESCRIPTION
1Measurement input terminal E (green)
2Measurement input terminal S (blue)
3Measurement input terminal H (red)
4Attached rod S - H for 2 wire resistance measurement
52000 count digital LCD
6Low battery indicator
7Reverse connection indicator
8Current circuit fault indicator (E - H)
9Voltage circuit fault indicator (E - S)
10 Indicator of presence of interference on voltage circuit (E - S)
11 Measurement press button
10 7
9
11
8
1432
6
5
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3.1 MEASUREMENT OF THE RESISTANCE OF AN EARTH POINT
To measure the resistance of an earth conductor, the so-called "62% method" is in general
recommended. This measurement requires the use of the items in the Earth Kit (see Ch.6:
TO ORDER).
Cut the power supply to the installation and disconnect it from the earth by
opening the earth bar!
1. Connect terminal E to the earth to be measured.
2. Check that the bar 4is not present between terminals S and H.
3. Drive in (completely if possible) the input earth rod H at a distance "a" from the earth point
(E) to be measured.
Note: this distance is further for a deep and extended earth point (larger range of influence).
4. Drive in the rod S at 62% of the distance between the earth E and the rod H (the rods S,
H and the earth point must be in line).
5. Connect the rods to their respective terminals with the leads.
6. Press the "MEASURE" button 11 and hold the button during measurement. Check that
none of the three indicators are flashing, otherwise, check the wiring (see Ch.3.4: FAULT
SIGNALS) and make the measurement again.
Measurement of resistance of earth point
3. OPERATING MODE
E S H
E
earth bar
S
S'' S' H
earth
point
0 % 52 % 62 % 72 % 100 %
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Checking the measurement
7. Note the displayed value.
8. Wait for a few moments and then re-measure.
9. Move rod S by 10% towards H, along the line between the earth point E and the rod H.
Measure and note the result.
10. From its initial position, move rod S by 10% towards E, along the line between the earth
point E and the rod H.
If the three values are of the same order of magnitude, the earth measurement is correct. If
not, increase the distance "a" and repeat the measurements.
Do not forget to reconnect the earth point after the measurement.
3.2 MEASUREMENT OF RESISTANCE
This measurement can be performed to determine the coupling resistance between two earth
points. For example, between the neutral and ground earth points (EDF distribution).
Cut the power supply of the installations. For measurement of the coupling
resistance, disconnect the earths!
1. Short-circuit terminals S and H using the bar provided 4.
2. Connect terminal E to the earth of the ground, and terminal H to the earth of the neutral.
3. Press the "MEASURE" button 11 and hold down until the measurement is displayed.
Check that none of the three indicators are flashing, otherwise check the connections (see
Ch.3.4: FAULT SIGNALS) and repeat the measurements.
2-wire resistance measurement
E S H
earth
bar
earth
bar
earth 1 earth 2
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NB: In the case of low value resistances, it becomes necessary to take into account the
resistance of the leads (approx. 22.5 mΩ/m for those supplied as accessories). To overcome
the resistance of the leads, we advise the use of a (4 pole) Earth/Resistivity Tester, on 4-wire
connection.
Do not forget to reconnect the earth points after measurement.
3.3 FAULT SIGNALS
■Display of a negative measurement
Reversal of rods H and E or rods S and E
Re-connect the leads correctly
■Displayed measurement value is 1---
Overrange (R > 2000 Ω)
Check the connections
■Flashing of FAULT light 8
Fault in current circuit (E - H). Flashing indicates that the voltage between the terminals E and
H is greater than 30 Vpeak.
This may mean that:
- the resistance of the current circuit between E and H is too high,
- the interference voltage in the circuit (E - H) is too high,
- the fuse is blown.
Check the rods, the leads, the connections and the fuse (see Ch.5.1.3).
■Flashing of HIGH RESISTANCE indicator 9
Fault in the voltage circuit (E - S). At the start of the measurement, the instrument
automatically checks the resistance between E and S. If this is greater than 50 kΩ, the
indicator 9begins to flash. This means that the measurement is likely to be very affected by
the resistance of the voltage circuit.
NB: The indicator flashes throughout the measurement, even if the resistance falls below
50 kΩduring it.
Check the rods, the leads and their connections.
■Flashing of HIGH NOISE indicator 10
Presence of interference voltages in the voltage circuit. Flashing indicates noise greater than
13 Vpeak between terminals E and S. These interference signals disturb the measurement.
Move the rods.
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4. SPECIFICATIONS
REFERENCE CONDITIONS
Temperature 23°C ± 3 K
Relative humidity 45% < RH < 55%
Supply voltage 10.5 V ± 0.2 V
Auxiliary resistances RH, RS and REnil
AC and DC interference voltages nil
Electric field < 1 V/m
Magnetic field < 40 A/m
DISTORTION QUANTITIES
Operating limits Max variation
Temperature -10...+55°C ± (1% rdg ± 1 pt) per 10°C
Relative humidity 20...90% ± 2% rdg ± 5 pt
Operating voltage 8.8...12.5 V ± (1% rdg ± 1 pt) per Volt
Voltage circuit load (1) 50 kΩ± 1% rdg per 10 kΩ± 4 pt
Current circuit load (2) 0.00...19.99 Ω 30 kΩ± 1% rdg per 10 kΩ± 2 pt
20.00...199.9 Ω30 kΩ±1% rdg per 10 kΩ± 2 pt
200.0...1999 Ω50 kΩ±1% rdg per 10 kΩ±2 pt
DC voltage 0...20 V (3) negligeable
AC interference voltages on H 0...23 Vrms or 32 Vpeak ±2% rdg ± 2 pt
AC interference voltages on S 0...9 Vrms or 13 Vpeak ±0.5% rdg ± 2 pt
(1) Resistance measured or resistance of rod E + resistance of rod S + resistance of leads
(2) Resistance measured or resistance of rod E + resistance of rod H + resistance of leads
(3) Possible flashing of HIGH RESISTANCE indicator above 4.5 V
METROLOGICALSPECIFICATIONS
Measurement range Resolution Measurement current Accuracy Empty voltage
(automatic range) (square signal 128 Hz)
0.00...19.99 Ω 0.01 Ω10 mA ± 2%rdg ±1 pt ≤42 Vpeak
20.00...199.9 Ω 0.1 Ω1 mA ± 2%rdg ±1 pt ≤42 Vpeak
200.0...1999 Ω 1 Ω100 µA ± 2%rdg ±3 pt ≤42 Vpeak
Response time between 4 and 8 s depending on measurement conditions
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ELECTRICALSPECIFICATIONS
Power supply 8 batteries R6 alkaline 1.5 V or 8 accumulators
Range of voltage permitted 8.8...12.5 V
Average battery life 1800 measurements of 15 seconds (at 23°C ± 3 K, with 8
alkaline batteries) permanent test of remaining battery life.
DISPLAY
Display LCD, 7 segments, height 18 mm,
2000 counts (3½ digits), direct reading in Ω
Low battery indicator "LO BAT" message
Overload indicator displayof 1 ---
Indicator of lead reversal - sign preceding the measurement
Indicator of current circuit fault by flashing red FAULT (E -H) LED
Indicator of voltage circuit fault
■Resistance too high by flashing red HIGH RESISTANCE (E - S) LED
■Interference noise by flashing red HIGH NOISE (E - S) LED
MECHANICAL SPECIFICATIONS
Protection index IP 54 in accordance with IEC 529 and NF EN 60529
Free drop 25 cm in accordance with IEC 68-2-32
Shock resistance 50 gn(gn= 9.81 m/s²) in accordance with IEC 68.2.27
Resistance to impacts IK 04 in accordance with NF EN 50102
Vibration resistance ± 1 mm, from 10 to 55 Hz in accordance with IEC 68.2.6
Dimensions (W x H x D) 238 x 136 x 150 mm
Connection of leads on 3 colour coded terminals for φ4 mm banana plugs or
6 mm spade clips
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CLIMATIC CONDITIONS
Domaine nominal de référence
Domaine d'utilisation
Domaine de stockage
100
90
80
70
60
50
40
30
20
10
Humidité en % HR
- 40 - 20 0 20 40 60 80
Température
en °C
Humidity in % RH
Nominal reference range
Operating range
Storage range
Temperature
in °C
CONFORMITY WITH STANDARDS
Electrical safety (in accordance with IEC 61010-1)
-Double insulation
-Installation category III
-Degree of pollution 2
-Service voltage 42 Vpeak
Electromagnetic compatibility
■Emissions and immunity in an industrial setting compliant with IEC 61326-1.
北京海洋兴业科技股份有限公司（证券代码：839145）
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