Chauvin Arnoux C.A 6521 Manuel utilisateur

FRANÇAIS

ENGLISH

DEUTSCH

ITALIANO

ESPANOL

C.A6521

C.A6523

C.A6525

■MEGOHMMETRES

■MEGOHMMETERS

■MEGOHMMETER

■MEGAOHMMETRI

■MEGAÓHMETRO

Notice de fonctionnement

User's manual

Bedienungsanleitung

Libretto d’Istruzioni

Manual de Instrucciones

Meaning of the symbol

Warning ! Please refer to the User’s Manual before using

the instrument.

In this User’s Manual, the instructions preceded by the above

symbol, should they not be carried out as shown, can result

in a physical accident or dammage the instrument and the

installations.

Meaning of the symbol

This device is protected by a double insulation or by a

reinforced insulation.Nolinkingisrequired fromthe protection

earth terminal to ensure the electrical security.

Meaning of the symbol

Warning ! Risk of electric shock.

The voltage of the parts marked with this symbol may be

dangerous. For safety reasons, this symbol will light up on

the LCD screen as soon as a voltage is generated.

Thank you for purchasing a C.A 6521, C.A 6523 or C.A 6525

insulation tester.

To get the best service from this instrument :

■read this user’s manual carefully

■respect the safety precautions detailed

PRECAUTIONS FOR USE

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

altitude, degree of pollution and place of use

■This instrument can be used on category II installations for

voltages which do not exceed 300 V in relation to the earth.

The equipment classified in category II is energy-consuming

equipment, receiving its power supply from the fixed

installation (cf. IEC 664-1, 1992 edition).

■Do not perform any insulation or resistance measurements

when the presence of a voltage is indicated.

■Use connection accessories that comply with the applicable

IEC safety standards, with a minimum voltage and voltage

surge category at least equal to those that you use for your

measurements.

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

the instrument and cancelling the warranty.

■Set the switch to OFF when the instrument is not in use.

■Check that none of the terminals is connected and that the

switch is set to OFF before opening the instrument.

English

CONTENTS

1. PRESENTATION

1.1. General Presentation ...................................................25

1.1.1. The Megohmmeter.................................................25

1.1.2 Accessories............................................................25

2. DESCRIPTION

2.1. Unit................................................................................26

2.1.1. C.A 6521 ................................................................26

2.1.2. C.A 6523 ................................................................26

2.1.3. C.A 6525 ................................................................26

2.2. Display ..........................................................................26

2.2.1. Symbols .................................................................26

2.2.2. Bargraph.................................................................27

2.2.3. Digital display .........................................................27

2.3. Control keyboard ..........................................................27

2.3.1. Yellow key...............................................................27

2.3.2. ALARM key (C.A 6523 and C.A 6525) ..................27

2.3.3. Key (C.A 6523 and C.A 6525) ...........................27

2.3.4. Key (C.A 6523 and C.A 6525) ...........................28

2.3.5. Key (C.A 6523 and C.A 6525) .........................28

2.3.6. TIMER key (C.A 6525) ...........................................28

3. MEASUREMENT FUNCTIONS

3.1. Insulation ......................................................................28

3.1.1. Safety checking ......................................................28

3.1.2. Insulation measurement ........................................29

3.2. Continuity......................................................................29

3.3 Resistance (C.A 6523 and C.A 6525) ..........................30

4. SPECIAL FUNCTIONS

4.1. Start/stop ......................................................................30

4.2. Automatic shutdown .....................................................30

4.2.1. Deactivation of automatic shutdown function ........31

(C.A 6523 and C.A 6525).......................................31

4.3. Power supply autotest ..................................................31

4.4. Buzzer...........................................................................31

4.4.1. The different audible signals ..................................31

4.4.2. Deactivation of the buzzer .....................................32

4.5. Alarm thresholds (C.A 6523 and C.A 6525).................32

4.5.1. Programming of the alarm thresholds ...................32

4.5.2. Activation/deactivation of the alarm thresholds.....32

4.5.3. Triggering of the alarm ...........................................33

4.6 Compensation of measuring leads ..............................33

(C.A 6523 and C.A 6525) .............................................33

4.7. Timer (C.A 6525) ..........................................................34

5. USE

5.1. Insulation testing ..........................................................35

5.2. Continuity measurements.............................................35

5.3. Resistance measurements (C.A 6523 and C.A 6525)......36

6. CHARACTERISTICS

6.1. Reference conditions....................................................36

6.2. Characteristics per function..........................................36

6.2.1. Voltage ...................................................................36

6.2.2. Insulation ................................................................36

6.2.3. Continuity ...............................................................37

6.2.4. Resistance (C.A 6523 and C.A 6525)....................37

6.2.5. Timer (C.A 6525)....................................................38

6.3. Power supply ................................................................38

6.4. Climatic conditions .......................................................38

6.5. Variations in nominal field of use .................................38

6.6. Limits ............................................................................39

6.7. Construction specifications ..........................................39

6.8. Compliance with international norms ...........................39

6.8.1. Electromagnetic compatibility : EC compliance ....39

6.8.2. Mechanical protection ............................................39

7. MAINTENANCE

7.1. Upkeep..........................................................................39

7.1.1. Replacing the batteries ..........................................39

7.1.2. Replacing the fuse .................................................40

7.1.3. Cleaning .................................................................40

7.1.4. Storage ...................................................................40

7.1.5. Calibration ..............................................................40

7.2. Maintenance .................................................................40

8. WARRANTY ...................................................... 41

9. TO ORDER ........................................................ 41

10. APPENDIX

10.1. Front views ................................................................ 102

CA. 6521 .................................................................... 102

C.A 6523 .................................................................... 103

C.A 6525 .................................................................... 104

10.2. Examples of applications .......................................... 105

10.2.1. Insulation measurements on installations .......... 105

10.2.2. Insulation measurements on cables ................... 106

10.2.3. Insulation measurements on motors .................. 107

10.3 Accessories ............................................................... 108

10.3.1. Shoulder bag ....................................................... 108

10.3.2. Use of the shoulder bag...................................... 108

10.3.3. Remote control probe ......................................... 109

1.PRESENTATION

Terminology

The term “continuity” will be used to mean a resistance

measurement performed with a current of at least 200 mA (with

the measured resistance lower than 20 Ω) in accordance with

the IEC 61557 norm, to distinguish it from a resistance

measurement(C.A 6523and C.A6525)performedwith acurrent

that is not predefined.

1.1. General Presentation

1.1.1. The Megohmmeter

These portable instruments function with batteries or a

rechargeable battery.They can be used to check the insulation,

continuity and voltages and to measure resistances.They help

to ensure the safety of electrical installations. The acquisition,

processing and display of the measurements are managed by

a microprocessor,

They offer a large number of advantages such as automatic

detection of a dangerous voltage on the MΩcalibre terminals

(with blocking of any insulation testing ifV > 25V), protection of

the instrument against external voltage surges, improved

operatorsafetythroughautomaticdischargingof thehighvoltage

fromtheequipment tested,automatic shutdown oftheinstrument

to optimize the battery charge life, a large LCD display with a

wide range of indicators that is very easy to read, etc. And,

depending on the model, backlighting of the LCD (C.A 6523

and C.A 6525), programming of the thresholds (C.A 6523 and

C.A 6525), the possibility of compensated leads for continuity

(C.A 6523 and C.A 6525), and display of the duration of the

measurement (C.A 6525).

1.1.2 Accessories

■Shoulder bag

(delivered with standard instrument, see § 10)

When placed in the shoulder bag, the instrument can either be

carried on the shoulder to transport it or around the neck for

use. This leaves the users’ hands free to perform the

measurements. Since the instrument is perpendicular to the

chest, it is easy to read.

At the bottom of the shoulder bag, underneath the instrument,

there is a pocket for the leads, the touch prod, the crocodile

clamp and the remote control probe.

■■

■Remote control probe

(option, see § 10)

This probe is used with the C.A 6523 and C.A 6525.These are

equipped with the special connector required to connect it to

the instrument.

It can be used for all the measurements, including activation of

insulationtesting, using theyellow buttonwhich worksin exactly

the same way as the button on the instrument.

A pushbutton on the back of the probe allows you to light the

measuring point (lighting of approx. 500 lux). This function is

veryuseful, since insulation testing is performed on installations

with the power off!

2. DESCRIPTION

2.1. Unit

See the diagrams of the instruments in § 10 (appendix at the

end of this user’s manual)

2.1.1. C.A 6521

➀2 safety terminals, Ø 4 mm (marked “ + “ and “ - “)

➁5-way switch: OFF, MΩ- 250 V, MΩ- 500 V,

20 Ω+, 20 Ω-

➂Yellow key (to activate insulation measurement)

➃Liquid crystal display

➄Battery compartment + stand (not shown in the drawing)

2.1.2. C.A 6523

➀2 safety terminals, Ø 4 mm (marked “ + “ and “ - “). Next to

the “ – “ terminal, there are two additional contacts for

connecting the remote control probe (3-point connector).

➁6-way switch :OFF, MΩ- 500V, MΩ- 1000V, 400 kΩ, 20 Ω+,

20 Ω-

➂Yellow keys (to activate insulation measurement), ALARM,

, and etc.

➃Backlit liquid crystal display

➄Battery compartment + stand (not shown in the drawing)

2.1.3. C.A 6525

➀2 safety terminals, Ø 4 mm (marked “ + “ and “ - “). Next to

the “ – “ terminal, there are two additional contacts for

connecting the remote control probe (3-point connector).

➁7-way switch : OFF, MΩ- 250 V, MΩ- 500 V,

MΩ-1000 V, 400 kΩ, 20 Ω+, 20 Ω-

➂Yellow keys (to activate insulation measurement), ALARM,

, , and TIMER.

➃Backlit liquid crystal display

➄Battery compartment + stand (not shown in the drawing)

2.2. Display

2.2.1. Symbols

Timer active (in TIMER mode)

ALARM Thresholdactiveorthreshold programmingin progress

>Upper threshold

<Lower threshold

Dangerous voltage generated

See the user’s manual

> 25 V Voltage > 25 V

Compensated leads

Buzzer active

Constant operation (no automatic shutdown)

Batteries flat

Fixed and Flashing :

incorrect compensation of the leads

2.2.2. Bargraph

Insulation > 2 GΩ

Insulation < 50 kΩ

2.2.3. Digital display

BAT Batteries low – must be changed

OL Range exceeded

- - - Insulation < 50 kΩat 250 V, < 100 kΩat 500 V

or < 200 kΩat 1000 V

2.3. Control keyboard

2.3.1. Yellow key

When this yellow key is pressed, a high voltage is generated for

insulation testing. However, if a voltage greater than 25 V has

been detected, no insulation testing is allowed and the key

becomes inactive.

In all cases, this key is only active for as long as it is pressed,

except in the TIMER mode specific to the C.A 6525 (first press

= activation, second press = deactivation).

2.3.2. ALARM key (C.A 6523 and C.A 6525)

The ALARM key can be used to activate/deactivate the alarm

thresholds during insulation, resistance and continuity

measurements.

When associated with the and keys, it can be used to

program the values of these thresholds.

2.3.3. Key (C.A 6523 and C.A 6525)

When programming the alarm thresholds, the key makes

the following elements flash in succession :

■the measurement unit digit (if there is one),

■the thousands digit,

■the hundreds digit,

■the tens digit,

■the units digit,

■the decimal separators,

■the type of threshold (upper or lower),

■and it then returns to the measurement units.

2.3.4. Key (C.A 6523 and C.A 6525)

When programming the alarm thresholds, the key can be

used to scroll through the possible values, which flash, and then

loop back to the beginning :

■MΩor GΩfor insulation, kΩor Ωfor resistance, for the

measurement units,

■1,2, 3 or _ for the thousands digit,

■0, 1, 2, 3, 4, 5, 6, 7, 8 and 9 for the hundreds, tens and units,

■“-.- - -” or“- -.- -” or“- - -.-”or “- - - -”for the decimal separator,

■> or < for the upper or lower threshold.

2.3.5. Key (C.A 6523 and C.A 6525)

When the key is pressed, the backlighting of the display comes

on.It will be turned off automatically one minute later.When it is

lit, you can turn the backlighting off by pressing this key again.

2.3.6. TIMER key (C.A 6525)

This key can be used to activate/deactivate timed insulation

measurement.

3. MEASUREMENT FUNCTIONS

3.1. Insulation

The insulation measurements correspond to the MΩpositions

of the switch.

3.1.1. Safety checking

The insulation measurement shall be performed when the

equipment is idle. The apparatus nevertheless automatically

detects and indicates the presence of a voltage on its terminals.

If the voltage present is less than 25 V, the insulation can be

tested, but the lower the test voltage (250 V, 500 V or 1000 V)

the greater the possibility of error.

If the voltage is greater than 25 V, “ > 25 V “ is displayed.

Pressingtheyellowkeydoes nottrigger insulationmeasurement,

but causes a series of buzzes (buzz, buzz, buzz, ...) and makes

the symbol flash until the yellow key is released. These

warnings only end if the voltage falls below 25 V (disconnect

the apparatus and neutralise the voltage which is present on

the network to be measured) or if the yellow key is released or,

naturally, if you turn off the instrument by returning the switch to

the OFF position.

Should the voltage be greater than 600 V, the digital display

will indicate "

3.1.2. Insulation measurement

If there is not a dangerous voltage (see § 3.1.1.), the user can

then measure the insulation by pressing the yellow key. The

high voltage is then generated between the terminals (marked

+ and -). The value of the measurement is shown on the

logarithmic scale of the bargraph and on the digital display, with

the corresponding MΩor GΩsymbol. As soon as the yellow

key is released, the instrument returns to voltage measurement

mode.

If the voltage generated may be dangerous, the symbol

is displayed.

The instrument indicates if the value measured is outside

its measurement range. If the insulation resistance is greater

than 2 GΩ, the OL symbol is displayed on the digital

measurement display.When the measurement is greater than

2 GΩ, the symbol lights up on the right-hand side of the

bargraph.

Similarly, if the insulation resistance is less than 50 kΩat 250V,

100 kΩat 500 V or 200 kΩat 1000 V, the digital measurement

display indicates “ - - - “ . When the measurement is less than

50 kΩ, only the symbol lights up on the left-hand side of the

bargraph.

Specific remark concerning the C.A 6523 and C.A 6525 :

A programmed alarm threshold can activate itself (see § 4.5).

Specific remark concerning the C.A 6525 :

The measurement can be timed (see § 4.7).

3.2. Continuity

The continuity measurements correspond to the “ 20 Ω+ “ or “

20 Ω- “ switch positions.

The instrument takes a measurement at I ≥200 mA and the "Ω"

symbol is displayed.If the threshold is active (ALARM function)

with the buzzer on, the buzzing starts very quickly (tens of

milliseconds); even before the measurement is displayed.

Between the “ 20 ΩΩ

ΩΩ

Ω+ “ position and the “ 20 ΩΩ

ΩΩ

Ω- “ position,

the direction of the current is inverted. The result of the

measurement is the mean (to be calculated by the user) of the

value displayed in the “ 20 Ω+“position and the value displayed

in the “ 20 Ω- “ position.

Continuitymeasurements shallbeperformedonidlecircuits.

The fuse protecting against external voltages is checked

when the apparatus is started up and at the end of each

continuity measurement.

The instrument indicates if the value measured is outside

its measurement range. If the resistance is greater than 20 Ω,

the OL symbol is displayed on the digital measurement display.

Specific remarks concerning the C.A 6523 and C.A 6525 :

The resistance of the measurement leads can be compensated

(see § 4.6).

A programmed threshold may trigger an alarm (see § 4.5).

Specific remark concerning the C.A 6521 :

In continuity mode, a lower threshold of 2 Ωis constantly active.

However, the buzzer can be deactivated by pressing the yellow

key.

3.3Resistance (C.A 6523 and C.A 6525)

Resistance measurement corresponds to the 400 kΩposition

of the switch on the C.A 6523 or C.A 6525.

The Ωsymbol is displayed with the k symbol if necessary.The

measurement is indicated on the digital measurement display.

The instrument indicates if the value measured is outside

its measurement range. If the resistance is greater than

400 kΩ, the OL symbol is displayed on the digital measurement

display.

Resistance measurements shall be performed on idle

circuits.

A programmed threshold may trigger an alarm (see § 4.5).

4. SPECIAL FUNCTIONS

4.1. Start/stop

When you move the switch from the OFF position to one of the

active positions, the battery voltage is applied to the circuit.The

instrument starts up and all the display segments light up at the

same time for 1 second. All the segments then go dark except,

for 2 seconds, the , and symbols which delimit the

size of the bargraph.The bargraph indicates the battery charge

life and the digital measurement display which indicates the

charge life available (0 to 100%) for a battery voltage varying

from 6.7 to 10 V.

The instrument can be shut down at any time by moving the

switch to OFF, which cuts off the battery power supply to the

whole instrument.

4.2. Automatic shutdown

After5 minuteswithoutanyactivitybytheuser onthe instrument

(key press on the keyboard or on the yellow key on the remote

control probe or turn of the rotary switch), the instrument shuts

down automatically.It is then on standby.When this is the case,

to start up the instrument again, all you have to do is press one

ofthe keys,turntheswitch orpress theyellowkey onthe remote

control probe of the C.A 6523 or C.A 6525.

The automatic switch-off is inhibited during continuity

testingas longasthe measurementbeing madevaries between

a value (between 0 W and 20 W) and OL (which means that

measurement is in progress).

On the C.A 6525, in TIMER mode (see § 4.7), the five minutes

beforeautomatic shutdownonly beginatthe endofthe maximum

15-minute measurement period.

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