Chauvin arnoux C.A 6533, C.A 6531 User Manual

■ MEGOHMMETRES

■ MEGOHMMETERS

■ MEGOHMMETER

■ MEGAOHMMETRI

■ MEGAÓHMETROS

C.A 6531
C.A 6533

FRANÇAIS
ENGLISH
DEUTSCH
ITALIANO
ESPANOL

Notice de fonctionnement
User's manual
Bedienungsanleitung
Libretto d’Istruzioni
Manual de Instrucciones

1

English

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 abov e
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. No linking is required from the 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 6531 or C.A 6533 insulation
tester.
To get the best service from this instrument :

■ read this user’s manual carefully

■ respect the safety precautions detailed

PRECA UTIONS 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-III installations for
voltages not exceeding 600 V in relation to the earth. Category
III meets severe reliability and availability requirements,
corresponding to permanent use on fixed industrial
installations (see IEC 1010-1 + A2).

■ 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.

■ Do not perform any insulation or resistance measurements

when the presence of a voltage is indicated.

■ Check that none of the terminals is connected and that the
switch is set to OFF before opening the instrument.

23

CONTENTS

1. PRESENTATION................................................26

1.1 General Presentation ................................................... 26

1.1.1 The Megohmmeter ..........................................26

1.1.2 Accessories .....................................................26

2. DESCRIPTION...................................................27

2.1 Housing......................................................................... 27

2.1.1 C.A 6531 ..........................................................27

2.1.2 C.A 6533 ..........................................................27

2.2 Display ..........................................................................27

2.2.1 Symbols ...........................................................27

2.2.2 Bargraph ..........................................................28

2.2.3 Digital display ...................................................28

2.3 Control keyboard ..........................................................28

2.3.1 Yellow key ........................................................28

2.3.2 ALARM key......................................................28

2.3.3 Key .............................................................28

2.3.4 Key .............................................................29

2.3.5 Key ............................................................29

2.3.6 DREL key ......................................................... 29

3. MEASUREMENT FUNCTIONS .........................29

3.1 Insulation ......................................................................29

3.1.1 AC / DC voltage measurement........................29

3.1.2 Insulation Measurement .................................. 30

3.2 Resistance ....................................................................30

3.3 Capacitance (C.A 6531) ...............................................31

3.4 AC / DC current (C.A 6531)..........................................31

3.5 AC voltage (C.A 6531)..................................................31

4. SPECIAL FUNCTIONS......................................31

4.1 Start/stop ......................................................................31

4.2 Automatic shutdown ..................................................... 32

4.2.1 Deactivation of the automatic

4.3 Autotests.......................................................................32

4.4 Buzzer...........................................................................32

4.5 Alarm thresholds .......................................................... 33

4.6 Relative measurements (DREL) ...................................34

4.7 Programming the capacitance

shutdown function............................................32

4.3.1 Power supply ...................................................32

4.3.2 Fuse (C.A 6531) ..............................................32

4.4.1 The different audible signals ...........................32

4.4.2 Deactivation of the buzzer...............................33

4.5.1 Programming of the alarm thresholds .............33

4.5.2 Activation/deactivation

of the alarm thresholds ....................................34

4.5.3 Tr iggering of the alarm.....................................34

per unit length (C.A 6531) ............................................34

24

5. USE....................................................................35

5.1 AC / DC voltage and insulation measurement............. 35

5.2 Resistance measurement ............................................36

5.3 Capacitance measurement (C.A 6531)........................36

5.4 AC / DC current measurement (C.A 6531) .................. 36

5.5 AC voltage measurement (C.A 6531) ..........................36

6. SPECIFICATIONS .............................................37

6.1 Reference conditions ....................................................37

6.2 Characteristics per function ..........................................37

6.2.1 Voltage.............................................................37

6.2.2 Insulation .........................................................37

6.2.3 Resistance .......................................................38

6.2.4 Capacitance (C.A 6531) ..................................38

6.2.5 Distance (C.A 6531) ........................................38

6.2.6 AC / DC current (C.A 6531).............................38

6.2.7 AC voltage (C.A 6531).....................................39

6.3 Power supply ................................................................ 39

6.4. Climatic conditions .......................................................39

6.5. Variations in nominal field of use ................................. 40

6.6. Limits ............................................................................40

6.7. Constr uction specifications .......................................... 40

6.8. Compliance with inter national standards .....................40

6.8.1. Electromagnetic compatibility: EC compliance41

6.8.2. Mechanical protection ..................................... 41

7. MAINTENANCE.................................................41

7.1. Upkeep..........................................................................41

7.1.1. Replacing the batteries....................................41

7.1.2. Replacing the fuse (C.A 6531) ........................41

7.1.3. Cleaning ...........................................................42

7.1.4. Storage ............................................................42

7.1.5. Calibration........................................................42

7.2. Maintenance .................................................................42

8. WARRANTY ......................................................42

9. TO ORDER ........................................................43

10. ATTACHMENT ................................................ 107

10.1 Front views ................................................................ 107

10.1.1. C.A 6531 ...................................................... 107

10.1.2. C.A 6533 ...................................................... 108

10.2. Examples of applications .......................................... 109

10.2.1. Insulation measurements

on electrical installations .............................. 109

10.2.2. Measurement on electrical or telecom cable.... 110

10.2.3. Capacitance measurement

between wires (C.A 6531) ............................ 111

10.2.4 Insulation measurements on motors ............ 112

10.3 Accessories ............................................................... 113

10.3.1. Shoulder bag ................................................ 113

10.3.2. Use of the shoulder bag ............................... 113

10.3.3. Remote control probe ................................... 114

25

1. PRESENTATION

1.1 General Presentation

1.1.1 The Megohmmeter

These portable instruments function with batteries or a vehicle
battery.
They can be used to check insulation and voltages and to
measure resistances.
The C.A 6531 can also be used for:

■ measurement of the capacitance of a telephone line

■ current measurement

■ measurement of the pure alternating component of a DC

voltage.

These megohmmeters help to ensure the safety of electrical
and telephone installations.
The acquisition, processing and display of the measurements
are managed by a microprocessor.

They offer a wide range of advantages such as:

■ automatic detection of the presence of a dangerous voltage

on the terminals in MW calibres (all insulation measurement
blocked if U > 25 V),

■ protection of the instrument against external voltage surges,

■ operator safety by means of automatic discharge of the high

voltage on the equipment tested,

■ display of the difference compared to a measurement value

in memory,

■ measurement of the length of a telephone line according to

its capacitance per km unit length (C.A 6531),

■ automatic shutdown of the instrument to save the batteries

and indication of the battery charge,

■ fuse testing by periodic checks during current measurement

(C.A 6531),

■ a large backlit LCD screen with a wide range of indicators

making it very easy for the user to read.

1.1.2 Accessories

■ Carrying bag

When placed in the carrying 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

■■

This probe is plugged in to a special connector.
It can be used for all the measurements, including activation of
insulation testing, using the yellow button which works in e xactly
the same way as the button on the instrument.

(part of standard delivery, see § 10)

(option, see § 10)

26

A pushbutton on the back of the probe allows you to light the
measuring point (approx. 500 lux). This function is very useful,
since insulation testing is performed on installations with the
power off!

2. DESCRIPTION

2.1 Housing

See the diagrams of the instruments in § 10 (appendix at the
end of this user’s manual)

2.1.1 C.A 6531

➀ 3 safety terminals, Ø 4 mm (marked “mA”, “ + “ and “ - “)

Next to the “ – “ terminal, there are two additional contacts
for connecting the remote control probe (3-point connector).

➁ 7-position switch:

OFF , MW - 50 V, MW - 100 V, 40 kW , 4000 nF, 400 mA, 400 V~

➂ Keys: Yellow (to activate insulation measurement), ALARM,

, , and DREL.

➃ Backlit liquid crystal display
➄ Battery compar tment + stand (not shown in the drawing)

2.1.2 C.A 6533

➀ 2 x 4 mm Ø safety terminals (labelled “ + ” and “ G “), a 3-

point jack for the guarded lead or the remote control probe
(labelled “ - “).

➁ 6-position switch:

OFF, MW - 50 V, MW - 100 V, MW - 250 V, MW - 500 V, 400 kW

➂ Keys: yellow (to activate insulation measurement), ALARM,

, , and DREL.

➃ Backlit liquid crystal display
➄ Battery compar tment + stand (not shown in the drawing)

2.2 Display

2.2.1 Symbols
ALARM Threshold active or threshold programming in progress
> Upper threshold

< Lower threshold

Dangerous voltage generated (only comes on if test
at 50 V)

See the user’s manual

> 25 V Voltage > 25 V present on the instrument’s terminals

DD

DREL Difference between actual measurement and

DD

measurement in memory (does not function for voltage
on the MW positions)

27

Buzzer active
Constant operation (no automatic shutdown)

P

Batteries flat

2.2.2 Bargraph

Insulation > 1.1 GW
Insulation < 70 kW

2.2.3 Digital display
BAT Batteries low – must be changed
OL Range exceeded

- - - Insulation < 10 kW at 50 V, < 20 k W at 100 V,

< 50 kW at 250 V, < 100 kW at 500 V

2.3 Control keyboard

2.3.1 Yellow key

When this yellow key is pressed, a high v oltage is generated fo r
insulation testing. However, if a voltage greater than 25 V has
been detected, no insulation testing is allowed and the key
becomes inactive. The instrument remains in voltage
measurement mode.

2.3.2 ALARM key

The ALARM key can be used to activate/deactivate the alarm
thresholds during insulation and resistance measurements.

When associated with the and keys, it can be used to
program the values of these thresholds.

2.3.3 Key

This key can be used to program:

■ The alarm thresholds (with the ALARM key)
By pressing the key, you can make the following elements
flash, successively:

- 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.

■ The capacitance per unit length in nF/km (with the key
on the CA 6531).
By pressing the key, you can make the following elements

flash, successively:

- the tens digit,

- the units digit,

- and it then returns to the tens digit.

28