GB - User’s manual
C.A 6522
C.A 6524
C.A 6526
Megohmmeters
Thank you for purchasing a megohmmeter C.A 6522, C.A 6524 or C.A 6526.
> 700V
For best results from your instrument:
read these operating instructions carefully,
comply with the precautions for use.
WARNING, risk of DANGER! The operator must refer to these instructions whenever this danger symbol appears.
WARNING, risk of electric shock. The voltage applied to parts marked with this symbol may be hazardous.
Equipment protected by double insulation. Earth.
The voltage on the terminals must not exceed 700 V. Battery.
Remote control probe. Information or useful tip.
The product is declared recyclable following an analysis of the life cycle in accordance with standard ISO14040.
Chauvin Arnoux has adopted an Eco-Design approach in order to design this appliance. Analysis of the complete
lifecycle has enabled us to control and optimize the effects of the product on the environment. In particular this
appliance exceeds regulation requirements with respect to recycling and reuse.
The 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.
2
PRECAUTIONS FOR USE
This instrument is compliant with safety standard IEC 61010-2-030 and the leads are compliant with IEC 61010-031, for voltages
up to 600 V in category IV or 1,000 V in category III.
Failure to observe the safety instructions may result in electric shock, fire, explosion, and destruction of the instrument and of
the installations.
The operator and/or the responsible authority must carefully read and clearly understand the various precautions to be taken in
use. Sound knowledge and a keen awareness of electrical hazards are essential when using this instrument.
If you use this instrument other than as specified, the protection it provides may be compromised, thereby endangering you.
The safety of any system in which this instrument might be incorporated is the responsibility of the integrator of the system.
This instrument can be used on category IV installations, for voltages not exceeding 600 Vrms with respect to earth or 700 Vrms
max between terminals.
Do not use the instrument on networks of which the voltage or category exceeds those mentioned.
Observe the environmental conditions of use.
Except for voltage measurements, make no measurements on live devices.
Do not use the instrument if it seems to be damaged, incomplete, or poorly closed.
Before each use, check the condition of the insulation on the leads, housing, and accessories. Any item of which the insulation
is deteriorated (even partially) must be set aside for repair or scrapping. There is a risk of electric shock if the instrument is used
without its battery compartment cover.
Before using your instrument, check that it is perfectly dry. If it is wet, it must be thoroughly dried before it can be connected or
used.
Use only the leads and accessories supplied. The use of leads (or accessories) of a lower voltage rating or category limits the
use of the combined instrument + leads (or accessories) to the lowest category and service voltage.
When handling the leads, test probes, and crocodile clips, keep your fingers behind the physical guard.
Before removing of the battery compartment cover, make sure that the measurement leads (and accessories) are disconnected.
Replace all of the batteries at once. Use alkaline batteries.
Use personal protection equipment systematically.
All troubleshooting and metrological checks must be done by competent, accredited personnel.
3
CONTENTS
1. PRESENTATION ....................................................................................................................................................................... 5
1.1. Delivery condition ........................................................................................................................................................... 5
1.2. Accessories .................................................................................................................................................................... 6
1.3. Replacement parts ......................................................................................................................................................... 6
1.4. Description of the instruments ....................................................................................................................................... 7
1.5. Terminal block .............................................................................................................................................................. 11
1.6. Functions of the instrument ......................................................................................................................................... 11
1.7. TEST button ................................................................................................................................................................. 11
1.8. Function keys ............................................................................................................................................................... 12
1.9. Display .......................................................................................................................................................................... 12
2. USE ......................................................................................................................................................................................... 13
2.1. General ......................................................................................................................................................................... 13
2.2. Voltage measurement ................................................................................................................................................... 13
2.3. Insulation measurement ............................................................................................................................................... 14
2.4. Continuity measurement .............................................................................................................................................. 17
2.5. Resistance measurement (C.A 6524 and C.A 6526) .................................................................................................... 19
2.6. Capacitance measurement (C.A 6526) ......................................................................................................................... 19
2.7. ∆REL function (C.A 6524 and C.A 6526) ...................................................................................................................... 19
2.8. HOLD function ............................................................................................................................................................ 20
2.9. Backlighting .................................................................................................................................................................. 20
2.10. SET-UP ....................................................................................................................................................................... 21
2.11. Alarm function ............................................................................................................................................................ 22
2.12. Automatic stop ........................................................................................................................................................... 23
2.13. Storage (C.A 6524 and C.A 6526) .............................................................................................................................. 23
2.14. Bluetooth communication (C.A 6526) ........................................................................................................................ 25
2.15. Errors .......................................................................................................................................................................... 27
2.16. Resetting the instrument ............................................................................................................................................ 28
3. TECHNICAL CHARACTERISTICS ........................................................................................................................................ 29
3.1. General reference conditions ....................................................................................................................................... 29
3.2. Electrical characteristics............................................................................................................................................... 29
3.3. Variation in the range of use ......................................................................................................................................... 32
3.4. Intrinsic uncertainty and operating uncertainty ............................................................................................................ 34
3.5. Power supply ................................................................................................................................................................ 34
3.6. Environmental conditions ............................................................................................................................................. 34
3.7. Mechanical characteristics .......................................................................................................................................... 34
3.8. Compliance with international standards ..................................................................................................................... 34
3.9. Electromagnetic compatibility (CEM) ........................................................................................................................... 34
4. MAINTENANCE ...................................................................................................................................................................... 35
4.1. Cleaning ....................................................................................................................................................................... 35
4.2. Replacing the batteries................................................................................................................................................. 35
5. WARRANTY ........................................................................................................................................................................... 36
4
1.1. DELIVERY CONDITION
1. PRESENTATION
MEM
HOLD
V
Ω
k
Ω
MR -
English
Safety data sheet Measuring Instrument in CAT II or CAT III or CAT IV (en)
For your safety and to avoid damage to property:
Read what follows carefully and observe these precautions
Read the other documents provided carefully, including any documents on the CD-ROM
Meanings of the principal symbols that may be present on your product:
CAUTION! Risk of electric shock!
CAUTION! Risk of Danger!
Refer to this safety datasheet, to the user
Refer to this safety datasheet and comply
manual and comply with the precautions for use.
with the precautions for use.
Current clamp: Can be applied to or
Current clamp: Do not apply to or remove from
removed from non-insulated or bare
conductors at dangerous voltages.
conductors at dangerous voltages.
In the European Union, this product is
subject to selective collection in accordance
The CE marking indicates compliance
with the European WEEE directive. Do not
with the European "Low Voltage", "EMC",
dispose of it as ordinary waste; contact the
"WEEE", and "RoHS" directives.
manufacturer for information about
collection points.
Earth
Do not dispose of the batteries as ordinary
waste; take them to a collection point.
Double insulation
Conditions of use
Temperature, Humidity: Comply with the values stated in the user manual.
Altitude : 2 000 m
Pollution degree : 2
Precautions for use
These safety instructions must be respected to assure the personal safety and the environment of use. If
you do not comply with them, there is a risk of electric shock, explosion or re.
If you use these instruments other than as specied or without observing the elementary safety rules, the
protection they provide may be compromised, endangering you.
ries is the responsibility of the
The safety of any system which may include these leads or accesso
assembler of the system.
Each time before use, always check that the insulation of the leads or accessories is in good
condition. Any element whose insulation is damaged (even partially) must be removed from use and
scrapped. A change of color of the insulating material is an indication of deterioration.
The steady-state voltages, currents, and measurement categories are marked on the instruments, on
the cords, and on the accessories. Comply with these values.
Use specic individual safety protections w
hen hazardous live parts can be accessible in the
installation where the measure is performed
Before using your instrument, check that it is in good working order (for example, by measuring a
known dangerous voltage).
If the manual states how to replace the fuse(s) of your instrument, use only the recommended fuses.
Before replacing the batteries (rechargeable or not), disconnect the leads of your instrument.
The use of a measurement instrument, a lead or an accessory with a lower
category or voltage downgrades the use of the assembly (instrument + lead +
accessory) to the lowest category and/or operating voltage.
Using a measuring instrument in a category II or III or IV environment can be dangerous. In such
measurement environments, the operators must be trained and/or accredited and/or informed of the
safety measures to be taken.
Measurement categories:
CAT II: Measurement category II is for measurements performed on circuits directly connected to the
low voltage installation
Examples: measurements on household appliances and portable tools.
CAT III: Measurement category III is for measurement performed in the building installation
Examples: distribution boards,
circuit-breakers, machine or industrial equipment with permanent
connection to the xed installation.
CAT IV: Measurement category IV is for measurements performed at the source of the low-voltage installation.
Example: meters and measurements on primary overcurrent protection devices and ripple
control units.
Cleaning
Disconnect the leads or the test accessories
Use a soft cloth, dampened with soapy water. Rinse with a damp cloth and dry rapidly with a dry
or hydrocarbons.
cloth or forced air. Do not use alcohol, solvents,
Do not modify the leads or accessories. Any non-compliant repairs can cause risks of electric shock
or burns.
TEST
➀
➁
➂
➃
SET-UP
0
REL
CLR
MΩ
OFF
50V
100V
250V
500V
1000V
C.A 6526
MEGOHMMETER
➇
➈
➄
➆
➉
➅
One C.A 6522, C.A 6524, or C.A 6526, depending on which model was ordered.
1
Two straight/right-angle safety leads (red and black).
2
One red crocodile clip.
3
One black test probe.
4
Six LR6 or AA batteries.
5
One carrying case, which also allows hands-free use.
6
One CD containing the user manuals (one file per language).
7
One multilingual safety data sheet.
8
One multilingual getting started guide.
9
One CD containing the MEG software for the C.A 6526.
10
5
1.2. ACCESSORIES
Type 3 remote control probe
Continuity pole
Thermometer + K thermocouple, C.A 861
Thermo-hygrometer C.A 846
USB-Bluetooth adapter
DataView® software
1.3. REPLACEMENT PARTS
2 straight/right-angle safety leads (red and black) 1.50 m long
2 crocodile clips (red and black)
2 test probes (red and black)
Carrying case that also allows hands-free use
For accessories and spare parts, visit our website:
www.chauvin-arnoux.com
6
1.4. DESCRIPTION OF THE INSTRUMENTS
1.4.1. C.A 6522
Connection terminals.
ALARM
HOLD
HOLD
V
Ω
M
G VHz
%
<
M mAµA
G
G
Backlit digital display unit.
M
DC
AC
V
k
P
4 function keys.
SET-UP
TEST
OFF
0
MΩ
250V
500V
1000V
TEST button to start the measurements.
C.A 6522
MEGOHMMETER
Six-position switch to choose the function or to
switch the instrument off.
7
1.4.2. C.A 6524
Connection terminals.
MEM
ALARM
HOLD
HOLD
V
Ω
Ω
k
MR
>
<
DARPI
REL
MEM
TEST
OFF
T1T2
SET-UP
%
G VHz
M mAµA
k
G
M
V
k
P
0
REL
CLR
M
G
DC
AC
MΩ
50V
100V
250V
500V
1000V
Backlit digital display unit.
6 function keys.
TEST button to start the measurements.
Ten-position switch to choose the function or to
switch the instrument off.
C.A 6524
MEGOHMMETER
8
1.4.3. C.A 6526
Connection terminals.
ALARM
HOLD
HOLD
V
Ω
Ω
k
MR -
MEM
>
<
DARPI
REL
MEM
TEST
OFF
T1T2
SET-UP
%
G VHz
M mAµA
k
G
M
V
k
P
0
REL
CLR
M
G
nF
µF
DC
AC
MΩ
50V
100V
250V
500V
1000V
Backlit digital display unit.
6 function keys.
TEST button to start the measurements.
Eleven-position switch to choose the function or to
switch the instrument off.
C.A 6526
MEGOHMMETER
9
1.4.4. ON THE BACK
Captive quarter-turn screw.
Battery compartment cover.
Magnet for attachment to a metallic surface (for the
C.A 6524 and the C.A 6526).
Non-skid pads.
Prop.
10
1.5. TERMINAL BLOCK
The terminal block has one + terminal and one - terminal that can be used to connect the remote control probe (optional accessory).
> 700V
600V CAT IV
1.6. FUNCTIONS OF THE INSTRUMENT
C.A 6522, C.A 6524, and C.A 6526 megohmmeters are portable measuring instruments with digital displays. They are powered
by batteries.
These instruments are used to check the safety of electrical installations. They are used to test new installations before they are
powered up, to check an existing installation in a power-off condition, or again to troubleshoot an installation.
C.A 6522 C.A 6524 C.A 6526
Test voltages for insulation measurements 250V - 500V - 1,000V 50V - 100V - 250V -
500V - 1,000V
Calculation of ratios PI and DAR
Continuity measurement
Resistance measurement
Programmable alarms
Frequency measurement
Capacitance measurement
Storage of the measurements
Bluetooth
In continuity testing, the instruments are protected against external voltages without a fuse.
1.7. TEST BUTTON
The TEST button is used to make insulation measurements.
50V - 100V - 250V 500V - 1,000V
11
1.8. FUNCTION KEYS
0
0
In general, the keys have a first function, marked on the key, obtained by a short press, and a second function, marked under
the key, obtained by a long press.
Key Function
The TIMER key is used to select the , , PI, and DAR functions.
The key is used to switch the display unit backlighting on and off.
HOLD
SET-UP
and The and keys serve:
∆Rel
MEM
CLR
The HOLD key is used to freeze, then unfreeze, the display of the measurement.
The SET-UP key is used to access the parameters and information of the instrument.
The
On the C.A 6524 and C.A 6526, the ALARM key is used to activate or deactivate the alarms.
On the C.A 6526, the ALARM key has a two-colour (green and red) indicator to report overshoots of alarm
thresholds.
to modify the display and to program the durations of insulation measurements,
to choose the continuity test current,
and to program the alarm thresholds (on the C.A 6524 and C.A 6526).
On the C.A 6524 and C.A 6526, the ∆Rel key is used to display the measurement from which a stored reference
measurement is subtracted.
On the C.A 6524 and C.A 6526, the MEM key is used to record measurements.
On the C.A 6524 and C.A 6526, the CLR key is used to erase recorded measurements.
On the C.A 6526, the Bluetooth key is used to transfer data recorded in the memory of the instrument to a
computer using the Bluetooth wireless connection. The Bluetooth link also serves to start insulation measurements
from the PC.
key is used to apply compensation for the resistance of the measurement leads in continuity testing.
1.9. DISPLAY
Logarithmic bargraph to display insulation
M
REL
T1T2
G VHz
%
M mAµA
k nF/ km
G
nF
M
µF
V
k
P
12
DC
AC
G
DARPI
VAR
MEM
ALARM
>
<
HOLD
When the measured value is below the minimum, the instrument displays - - - - .
In voltage measurement, when the measurement exceeds the limit (either positive or negative), the instrument displays OL or -OL.
measurements.
Secondary display unit.
Main display unit.
MΩ
2.1. GENERAL
2. USE
At start-up, the instrument indicates the remaining battery
life.
G VHz %
If the battery voltage is too low to ensure correct operation
of the instrument, it so reports.
The batteries must then be replaced (see § 4.2), since the
battery life indication is no longer reliable.
Except for the voltage measurement, all measurements are made on devices in the power-off condition. It is therefore
necessary to check that there is no voltage on the device to be tested before making a measurement.
2.2. VOLTAGE MEASUREMENT
Set the switch to V or to one of the MΩ
positions.
Start by making sure of the proper operation of the voltage
measurement, by measuring a known voltage before each
use. For example on a power outlet.
k
MR -
V
OFF
Ω
Ω
50V
100V
250V
500V
1000V
Then, using the leads, connect the device to be tested to the
terminals of the instrument.
G VHz
DC
AC
V
The instrument displays the voltage on the terminals. It detects whether the voltage is AC or DC and, if it is AC, displays its
frequency (on the C.A 6524 and the C.A 6526).
G VHz
In the MΩ settings, the symbol indicates that the voltage is too high (> 25
V) and that insulation measurements are prohibited.
If the voltage is > 15 V, continuity, resistance, and capacitance measurements
are prohibited.
DC
AC
V
13
MΩ
2.3. INSULATION MEASUREMENT
V
Ω
Ω
k
MR -
Use the leads to connect the device
to be tested to the terminals of the
instrument. The device to be tested
must not be live.
Pressing the key, before or during
the measurement, changes the
secondary display unit to display the
current (on the C.A 6524 and C.A
6526) or the elapsed time.
Press the TEST button and hold it down until the
measurement displayed is stable.
If a voltage greater than 25 V is detected, pressing the
TEST button has no effect.
OFF
50V
100V
250V
500V
1000V
Set the switch to one of the MΩ positions.
The test voltage you should choose depends on the voltage of the installation to be
tested. For example, for a network installation at 230 V, insulation measurements
will be made at 500 V.
DC
V
The measurement is displayed on the main display unit
and on the bargraph.
The secondary display unit indicates the test voltage
generated by the instrument.
M
> 1s
TEST
G V
M
The symbol indicates that the instrument is generating a hazardous voltage (> 70 V).
The measurement results can be thrown off by the impedances of additional circuits connected in parallel or by transient
currents.
At the end of the measurement, release the TEST button. The instrument stops generating the test voltage and discharges the
device being tested. The symbol is displayed until the voltage on the device has fallen below 70 V.
Do not disconnect the leads and do not start any measurement while the symbol is displayed.
When you release the TEST button, the measurement results remain displayed (HOLD) until the next measurement, or the HOLD
key is pressed, or the instrument is switched off.
14
HOLD
2.3.1. OPERATION OF THE TEST BUTTON
PI
T1T2
DARPI
T1T2
The TEST button is pressed to make an insulation measurement. The test voltage is generated for as long as the press is maintained.
When the button is released, the measurement stops.
In the mode, simply press the TEST button once to start the measurement, then press it a second time to stop; there is no
need to keep the button pressed. However, if you forget to stop the measurement, it will stop automatically after 15 minutes.
In the timed test mode ( , DAR, PI), simply press the TEST button once to start the measurement; it will stop automatically at
the end of the programmed time.
2.3.2. TIMER KEY
This key is active only for insulation measurements.
1st press This function is used to lock the TEST button so as not to have to keep it pressed during the
insulation measurement.
2nd press This function is used to program a test duration between 1 and 39:59 minutes. Use the and
keys to modify the value displayed.
When the time is displayed, press the key to enter programming mode. When the first digit
blinks, you can change it using the key. Press to go to the next digit and to change it.
Press one last time to validate.
3rd press
4th press
5th press Exit from the function.
When one of the 3 functions, , PI, or DAR, is programmed, pressing the TEST button triggers the count down from the
programmed time. When the time has elapsed, the measurement stops and the result is displayed.
The PI function is used to calculate the polarization index, which is the ratio of the measurement
at T2 = 10 minutes to the measurement at T1 = 1 minute.
The DAR function is used to calculate the dielectric absorption ratio, which is the ratio of the
measurement at T2 = 1 minute to the measurement at T1 = 30 seconds.
DAR
M
DAR
M
Successive presses on the key display intermediate values.
For :
the programmed time, the voltage and current at the end of the measurement.
For PI and DAR:
time T1 and the voltage, current, and insulation resistance at that time.
time T2 and the voltage, current, and insulation resistance at that time.
15
Interpretation of the results
DAR PI Condition of insulation
DAR < 1,25 PI < 2 Poor or even dangerous
1,25 ≤ DAR < 1,6 2 ≤ PI < 4 Good
1,6 ≤ DAR 4 ≤ PI Excellent
Press the TEST key to return to the voltage measurement.
TEST
2.3.3. REMOTE CONTROL PROBE (OPTION)
The remote control probe is used to trigger the measurement using the remoted TEST button on the probe. To use this accessory,
refer to its operating instructions.
When the probe is connected, the symbol is displayed.
DC
V
16
0
0
2.4. CONTINUITY MEASUREMENT
MΩ
The continuity measurement measures a low resistance (< 10 or 100 Ω depending on the current) at a high current (200 or 20 mA).
Set the switch to Ω.
V
Ω
Ω
k
MR -
The standard requires that the measurements be made at 200 mA. But a current of 20 mA reduces the consumption of
the instrument and so increases its battery life.
The C.A 6522 can make measurements only at 200 mA.
2.4.1. COMPENSATION OF THE LEADS
To ensure precise measurements, it is necessary to compensate the resistance of the measurement leads.
Short-circuit the measurement leads and long-press the
OFF
50V
100V
250V
500V
1000V
key.
Press the key to choose current measurement.
M mA
> 2s
The display changes to zero and the symbol is displayed. The resistance of the leads will be systematically subtracted from
all continuity measurements. If the resistance of the leads is > 10 Ω, there is no compensation.
The compensation remains in memory until the instrument is switched off. The continuity measurement range is reduced
by the stored compensation value.
If the leads are changed with no change of compensation, the display may become negative. The instrument reports that
the compensation must be redone by displaying blinking.
17
0
2.4.2. ELIMINATION OF THE COMPENSATION OF THE LEADS
0
To eliminate the compensation of the leads, leave the leads open and long-press the
key.
> 2s
The display indicates the resistance of the leads and the symbol goes off.
2.4.3. MAKING A MEASUREMENT
Use the leads to connect the device to be tested to the terminals of the instrument. The device to be tested must not be live.
M mA
M mA
R
The instrument makes the measurement directly. It displays the result and the
measurement current.
To obtain a continuity value per standard IEC 61557:
Make a measurement at 200 mA and note its value, R1.
Then reverse the leads and note the value R2.
R1 + R
Calculate the mean:
R =
2
2
If an external voltage > 15 V appears during the continuity measurement, the instrument is protected without a fuse. The
continuity measurement is stopped and the instrument reports an error until the voltage disappears.
18
MΩ
2.5. RESISTANCE MEASUREMENT (C.A 6524 AND C.A 6526)
MΩ
CLR
The resistance measurement is made with a weak current and can measure resistances up to 1000 kΩ.
Set the switch to kΩ. As for a continuity measurement, connect the device to
be tested to the terminals of the instrument. The device
to be tested must not be live (see § 2.4.3).
k
MR -
V
Ω
Ω
OFF
50V
100V
250V
500V
1000V
k
2.6. CAPACITANCE MEASUREMENT (C.A 6526)
Set the switch to .
V
Ω
Ω
k
MR -
OFF
50V
100V
250V
500V
1000V
As for a continuity measurement, connect the device to
be tested to the terminals of the instrument. The device
to be tested must not be live (see § 2.4.3).
G
nF
2.7. ∆REL FUNCTION (C.A 6524 AND C.A 6526)
For an insulation, resistance, or capacitance measurement, it is possible to subtract a reference value from the measured value
and display the difference.
To do this, make a measurement, then press the ∆REL.
The measurement (Rref) is stored and subtracted from
the present measurement (Rmeas).
The main display changes to zero and the ∆REL
symbol is displayed.
V
M
G
REL
REL
19
V
G
M
If the measured value is less than the stored value, the display becomes negative.
HOLD
0
Pressing the key displays, in addition, the measured
value as a % of the stored value.
%
G
Rmeas - Rref
Rref
In insulation measurements, only the digital display is modified by the ∆REL. The bargraph continues to display the true
measured value.
To exit from the ∆REL function, it is necessary to press the ∆REL key again or turn the switch.
2.8. HOLD FUNCTION
Pressing the HOLD key freezes the display of the measurement. This can be done in all functions except
voltage in the MΩ setting.
To unfreeze the display, press the HOLD key again.
It is not possible to effect a HOLD in a timed measurement ( , DAR, PI).
x 100
REL
M
2.9. BACKLIGHTING
Pressing the key switches on the backlighting of the display unit.
To switch it off, press the key again. Otherwise, it goes off by itself at the end of one minute.
20
2.10. SET-UP
SET-UP
> 2s
A long press on the SET-UP key is used to enter the configuration (set-up) function of the instrument.
Then use the and keys to scroll and modify the parameters.
1st press
on
2nd press
on
3rd press
on
4th press
on
5th press
on
The buzzer is active.
To deactivate it, press to make On blink, to change it to OFF, then to validate
the change.
The symbol disappears from the display when Set-up is exited.
Automatic switching off is activated.
To deactivate it, press to make OFF blink, to change it to On, then to validate
the change.
P
The P symbol appears on the display when Set-up is exited.
Display of the type of instrument.
Display of the internal software version.
Display of the version of the boards.
6th press
on
To exit from configuration, short-press the SET-UP key.
The de-activations of the buzzer and of automatic switching off are lost when the instrument is off.
Return to the first press.
21
HOLD
MEM
2.11. ALARM FUNCTION
On the C.A 6522, in continuity testing, pressing the TEST key activates the alarm. The symbol is displayed, along with the
threshold, which is 2 Ohms. If the measurement is below this threshold and the buzzer is active, the instrument emits an audible
signal.
On the C.A 6524 and the C.A 6526, pressing the key
activates the alarm. The alarm function is available in
insulation, resistance, and continuity measurements.
While it is displayed, you can change this value using the key, except during insulation measurements.
For each position of the switch, there are 3 pre-recorded threshold values:
in continuity: < 2 Ω, < 1 Ω and < 0.5 Ω.
in resistance: > 50kΩ, > 100kΩ and > 200kΩ.
in insulation
50V : < 50 kΩ, < 100 kΩ and < 200 kΩ.
100V : < 100 kΩ, < 200 kΩ and < 400 kΩ.
250V : < 250 kΩ, < 500 kΩ and < 1 MΩ.
500V : < 500 kΩ, < 1 MΩ and < 2 MΩ.
1000V : < 1 MΩ, < 2 MΩ and < 4 MΩ.
The symbol is displayed, along with the threshold, on
the secondary display unit.
ALARM
<
The third threshold can be replaced by a user-programmed value.
If you want a specific threshold value, press the key to enter the programming function, while the threshold
value is displayed.
The > symbol starts blinking; you can change it to < using the key. This symbol indicates the direction of
the alarm threshold: < for a low threshold and > for a high threshold.
Press the key again to go to the first digit, then to the decimal point, then to the second digit, etc. down
to the unit, and one final time on the key to validate the programming of the threshold.
When the alarm threshold is crossed, i.e. when the measurement is below the low alarm threshold or above the high alarm
threshold, the instrument emits a continuous audible signal and the secondary display unit displays the crossing of the threshold.
M
ALARM
<
ALARM
>
k
M
In the example above, the user can thus check that their continuity measurement is indeed less than 2 Ω, just by listening, without
looking at the display unit. They can check insulation quality in the same way.
22
On the C.A 6526, the key is green when the alarm threshold has not been crossed and red when it has. In continuity, it is the
HOLD
MEM
other way round. This enables the user to check the measurement at a glance.
The HOLD key is also used to stop the buzzer after an alarm threshold is crossed.
A second press on the key deactivates the alarm.
2.12. AUTOMATIC STOP
After 5 minutes of operation with no sign of the user’s presence (key press or rotation of the switch), the instrument switches to
standby.
Simply press any key to exit from standby. The instrument returns to the state it was in, with no loss information: value of the last
measurement, compensation of the leads, ∆Rel, timed mode, alarm, etc.
Automatic switching off is disabled during:
insulation measurements in mode and in timed mode ( , PI, or DAR).
continuity measurements, for as long as measurements are made.
This automatic switching off can be disabled (see § 2.10).
2.13. STORAGE (C.A 6524 AND C.A 6526)
2.13.1. RECORDING A MEASUREMENT
To record a measurement, it is first necessary to freeze the display using the HOLD key or to wait for the end of a timed measurement.
In insulation measurements, the measurement must be stable enough to be frozen.
M
M mAµA
M
HOLD
Then long-press the MEM key to store the measurement.
> 2s
It is recorded with all information tied to it but not necessarily displayed at the time of storage: voltage, current, duration of tests
T1 and T2 in the case of PI and DAR, etc.
The measurement is recorded in the first memory slot
available (here, number 1).
MEM
M
The bargraph indicates the level of filling of the memory.
23
MΩ
MEM
HOLD
2.13.2. REREADING THE RECORDS
MEM
Ω
CLR
Set the switch to MR.
V
Ω
Ω
k
MR -
To see the other measurements, press the key. The
record number is decremented and the corresponding
measurement is displayed.
To scroll rapidly through the recorded measurements, keep
the key pressed.
OFF
50V
100V
250V
500V
1000V
The instrument displays the last measurement recorded.
MEM
M
To see one particular measurement, use the key to
change the record number.
Once the record number has been chosen, you can see all information concerning the measurement.
> 2s
2.13.3. ERASING ONE RECORD
Set the switch to MR.
V
Ω
Ω
k
MR -
Long-press thee MEM key, then use the key to scroll the information.
To exit from this rereading of records, long-press MEM again.
OFF
M
50V
100V
250V
500V
1000V
Use the and , keys to select the number of the record
to be erased.
Then long-press the CLR key.
> 2s
REL
24
The record number blinks and the main display unit
MEM
MΩ
displays CLR.
Otherwise, to cancel, long press the CLR key again.
2.13.4. ERASING ALL RECORDS
Repeat the record erasure procedure:
Set the switch to MR.
Long-press the CLR key.
Press the key and the record number is replaced by ALL.
To cancel, long-press the CLR key again.
Otherwise, to confirm the erasure of all records, long-press the MEM key.
Then long-press the MEM key to confirm the erasure.
> 2s
The instrument then reports that the memory is empty.
MEM
2.14. BLUETOOTH COMMUNICATION (C.A 6526)
Before connecting your instrument for the first time, install the MEG software delivered with it.
Set the switch to MR .
V
Ω
Ω
k
MR -
Then long-press the key.
OFF
50V
100V
250V
500V
1000V
> 2s
25
The symbol is displayed and the instrument waits for a message from the computer. When the link is set up, the symbol
starts blinking.
If your PC does not have a Bluetooth port, install a USB-Bluetooth adapter. Then, in the Windows bar, locate the Bluetooth logo,
right-click on it, and choose Add a peripheral.
The PC searches its environment for Bluetooth-compatible devices. When the megohmmeter is detected, select it and click Next.
If a coupling code is requested, enter 1111.
26
You can then transfer recorded data from the instrument to the computer. If you turn the switch to an insulation position, you can
transmit the measurements in real time.
To use the MEG software, refer to its help function.
To exit from the Bluetooth connection, long-press the key again, whatever the setting of the switch.
2.15. ERRORS
While the instrument is in operation, errors may be reported. The causes of any errors must be eliminated before the instrument
can be used again.
2.15.1. PRESENCE OF A VOLTAGE BEFORE AN INSULATION MEASUREMENT
Before the insulation measurement, the instrument is in voltage measurement
mode. If there is a voltage on the terminals in excess of 25 V and you try even
so to make a measurement, the instrument reports the situation.
Eliminate the voltage and resume the measurement.
V
2.15.2. OVERSHOOT OF RANGE DURING AN INSULATION MEASUREMENT
<
M mAµA
G
G
If, during an insulation measurement, the value to be measured exceeds the
measurement range (which depends on the instrument and the test voltage),
the instrument so reports.
In the case of a C.A 6524 or C.A 6526 in the 1000 V range, that leads to display
of the screen shown opposite.
27
DAR
HOLD
0
MΩ
With the C.A 6524 or C.A 6526, if this occurs during a DAR or PI measurement, the
instrument interrupts the measurement and displays the screen shown opposite.
G
2.15.3. PRESENCE OF A VOLTAGE DURING A CONTINUITY, RESISTANCE, OR CAPACITANCE MEASUREMENT
If, during a continuity, resistance, or capacitance measurement, the instrument
detects an external voltage in excess of 15 V (AC or DC), it interrupts the
measurement and displays the screen shown opposite.
You must eliminate the voltage to be able to resume the measurement.
2.15.4. MEMORY FULL (C.A 6524 AND C.A 6526)
When the memory is full (300 records for the C.A 6524; 1300 for the C.A 6526),
MEM
it is no longer possible to record measurements and the instrument displays
the screen shown opposite.
Records must then be erased before new measurements can be recorded.
2.16. RESETTING THE INSTRUMENT
If your instrument crashes, it can be reset like a PC.
Press the and keys simultaneously.
+
Then turn the switch.
V
Ω
Ω
k
MR -
OFF
50V
100V
250V
500V
1000V
The instrument reboots.
28
3. TECHNICAL CHARACTERISTICS
3.1. GENERAL REFERENCE CONDITIONS
Quantity of influence Reference values
Temperature 23 ± 3 °C
Relative humidity 45 to 55% RH
Frequency DC and 45 to 65 Hz
Supply voltage
Electric field 0V/m
Magnetic field < 40A/m
The intrinsic uncertainty is the error specified for the reference conditions.
The operating uncertainty includes the intrinsic uncertainty plus variations of the quantities of influence (position, supply voltage,
temperature, etc.) as defined in standard IEC-61557.
The uncertainties are expressed in % of the reading (R) and in number of display points (ct):
± (a %R + b ct)
battery life indication 58 ± 8%
3.2. ELECTRICAL CHARACTERISTICS
8 ± 0.2V
3.2.1. VOLTAGE MEASUREMENTS
Particular reference conditions
Peak factor = 1.414 in AC, sinusoidal signal
Specified measurement range 0.3 - 399.9V 400 - 700V
Resolution 0.1V 1V
Intrinsic uncertainty
Input impedance 400kΩ
Frequency ranges DC and 15.3 at 800Hz
± (3% + 2 ct)
3.2.2. FREQUENCY MEASUREMENTS
Measurement range 15.3 - 399.9Hz 400 - 800Hz
Resolution 0.1Hz 1Hz
Intrinsic uncertainty ± (1% + 2 ct) ± (1.5% + 1 ct)
3.2.3. INSULATION MEASUREMENT
Particular reference conditions
Capacitance in parallel on resistance: null
Measurement ranges as a function of the model of instrument
Test voltage C.A 6522 C.A 6524 C.A 6526
50V 10kΩ - 10GΩ 10kΩ - 10GΩ
100V 20kΩ - 20GΩ 20kΩ - 20GΩ
250V 50kΩ - 10GΩ 50kΩ - 50GΩ 50kΩ - 50GΩ
500V 100kΩ - 20GΩ 100kΩ - 100GΩ 100kΩ - 100GΩ
1,000V 200kΩ - 40GΩ 200kΩ - 200GΩ 200kΩ - 200GΩ
29
Intrinsic uncertainty
RN = UN / 1 mA
Test voltage (UN) 50V - 100V - 250V - 500V - 1,000V
Specified measurement
range
Resolution 1kΩ 10kΩ 100kΩ 1MΩ 10MΩ 100MΩ
Intrinsic uncertainty For UN = 50V: ± (3% + 2 ct + 2%/GΩ)
Whatever the test voltage, for an insulation resistance ≤ 2 GΩ, the intrinsic uncertainty is ± (3% + 2 ct).
Bargraph
Specified measurement range 0.1MΩ - 200GΩ *
Resolution 9 segments per decade
Intrinsic uncertainty ± (5% + 1 segment)
*: When the measurement range is exceeded, the whole bargraph is displayed.
Test voltage
With a test current < 1 mA, the intrinsic uncertainty on UN is -0% + 20%.
10 - 999 kΩ and
1.000 - 3.999 MΩ
For UN = 100V: ± (3% + 2 ct + 1%/GΩ)
For UN = 250V: ± (3% + 2 ct + 0.4%/GΩ)
For UN = 500V: ± (3% + 2 ct + 0.2%/GΩ)
For UN = 1,000V: ± (3% + 2 ct + 0.1%/GΩ)
4.00 - 39.99 MΩ40.0 - 399.9 MΩ400 - 3999 MΩ4.00 - 39.99 GΩ40.0 - 200.0
GΩ
Specified measurement range 0.0 - 399.9V 400 - 1,250V
Resolution 0.1V 1V
Intrinsic uncertainty ± (3% + 3 ct)
Typical discharge time after test
To go from UN to 25 V, the discharge time is < 2s/µF
Test current
Maximum test current: 2mA +0% -50%
Specified measurement range 0.01 - 39.99µA 40.0 - 399.9µA 0.400 - 2.000mA
Resolution 10nA 100nA 1µA
Intrinsic uncertainty ± (10% + 3 ct)
Typical test voltage vs load curve
The voltage as a function of the measured resistance takes the following form:
I = 1 mA
U
N
30
The range of operation per IEC 61557 is from 100kΩ to 2 GΩ (see § 3.4).
3.2.4. CONTINUITY MEASUREMENTS
Particular reference conditions
Inductance in series with the resistance: zero.
Specified measurement range (without
compensation of the leads)
Resolution 10mΩ 100mΩ
Intrinsic uncertainty ± (2% + 2 ct)
Test current 200mA 20mA
No-load voltage ≥ 6V
*: In the case of incorrect compensation of the leads, the instrument allows display of negative values, down to -0.05 Ω at 200 A
and -0.5 Ω at 20 mA.
Test current
200 mA range: 200mA (-0mA + 20mA)
20 mA range: 20mA ± 5mA
Specified measurement range 0 - 250mA
Resolution 1mA
Intrinsic uncertainty ± (2 % + 2 ct)
Compensation of the leads: 0 to 9.99 Ω.
0.00 * - 10.00 Ω 0.0 * - 100.0 Ω
3.2.5. RESISTANCE MEASUREMENTS (C.A 6524 AND C.A 6526)
Specified measurement range 0 - 3999 Ω 4.00 - 39.99kΩ 40.0 - 399.9kΩ 400 - 1000kΩ
Resolution 1Ω 10Ω 100Ω 1kΩ
Intrinsic uncertainty ± (3% + 2 ct)
No-load voltage approximately 4.5V
3.2.6. CAPACITANCE MEASUREMENTS (C.A 6526)
Specified measurement range 0.1 - 399.9nF 400 - 3999nF 4.00 - 10.0µF
Resolution 0.1nF 1nF 10nF
Intrinsic uncertainty ± (3% + 2 ct)
3.2.7. TIMER
Specified measurement range 0:00 - 39:59
Resolution 1s
Intrinsic uncertainty ± 1s
31
3.2.8. STORAGE
Number of records:
300 for the C.A 6524
1300 for the C.A 6526.
3.2.9. BLUETOOTH
Bluetooth 2.1
Class II
Range 10 metres
3.3. VARIATION IN THE RANGE OF USE
3.3.1. VOLTAGE MEASUREMENT
Quantities of influence Range of influence Quantity influenced
Temperature -20 to + 55 °C V, F 0.3%/10 °C + 1 ct
Relative humidity 20 to 80% RH V, F 1% + 2 ct
Frequency 15.3 to 800Hz V 1% 2% + 1 ct
Supply voltage 6.6 to 9.6V V, F 0.1% + 2 ct
Common mode rejection in
AC 50/60 Hz
0 to 600Vac V 50dB 40dB
Typical Maximum
Influence
3.3.2. INSULATION MEASUREMENT
Quantities of influence Range of influence Quantity influenced
MΩ
R ≤ 3GΩ
3GΩ < R < 10GΩ
Temperature -20 to + 55 °C
Relative humidity 20 to 80% RH
10GΩ ≤ R
UN: 50 to 500V
UN: 1,000V
Measurement current 1%/10 °C + 1 ct 2%/10 °C + 2 ct
MΩ 2% + 1 ct 3% + 2 ct
UN: 50 to 1,000V 1% + 2 ct
Measurement current 1% + 2 ct
Typical Maximum
1%/10°C + 1pt
Influence
2%/10 °C + 2 ct
3%/10 °C + 2 ct
4%/10 °C + 2 ct
0.5%/10 °C + 1 ct
1%/10 °C + 1 ct
Supply voltage 6.6 to 9.6V MΩ 0.1% + 2 ct
50V range
R ≤ 0.1GΩ : 4V
from 0.1GΩ to 1GΩ : 0.2V
50/60Hz AC voltage
superposed on the test
voltage (UN)
100V and 250V ranges
from 100kΩ to 10MΩ : 20V
from 10MΩ to 1 GΩ : 0.3V
500V and 1,000V ranges
from 500kΩ to 50MΩ : 20V
from 50MΩ to 3 GΩ : 0.3V
32
5% + 2 ct
Quantities of influence Range of influence Quantity influenced
0 to 5µF at 1mA MΩ 1% + 1 ct
50V, 100V and 250V
ranges
from 10kΩ to 3 GΩ
500V and 1,000V
ranges
from 100kΩ to 10GΩ
50V range, ≤ 5GΩ
250V range,
≤ 15GΩ
1,000V range,
≤ 100GΩ
Capacitance in parallel
on resistance to be
measured
Common mode
rejection in AC
50/60 Hz
0 to 2µF
0 to 1µF
0 to 600Vac V 50dB 40dB
3.3.3. RESISTANCE AND CONTINUITY MEASUREMENT
Influence
Typical Maximum
6% + 2 ct 10% + 2 ct
6% + 2 ct 10% + 2 ct
6% + 2 ct 10% + 2 ct
Quantities of influence Range of influence Quantity influenced
at 200mA 2%/10 °C + 2 ct
Temperature -20 to + 55 °C
Relative humidity 20 to 80% RH
Supply voltage 6.6 to 9.6V
0.5Vac at 200mA
50/60Hz AC voltage
superposed on the test
voltage
Common mode
rejection in AC
50/60 Hz
For R ≥ 10 Ω:
0.4Vac
Accepts no
perturbations
0 to 600Vac
at 20mA 2%/10 °C + 2 ct
R 1%/10 °C + 2 ct
at 200mA 4% + 2 ct
at 20mA 4% + 2 ct
R 3% + 2 ct
at 200mA
at 20mA
R
at 20mA
R
at 200mA
at 20mA
R
Influence
Typical Maximum
0.1% + 2 ct
5% + 10 ct
50dB 40dB
3.3.4. CAPACITANCE MEASUREMENT (C.A6526)
Quantities of influence Range of influence Quantity influenced
Temperature -20 to + 55 °C µF 0.5%/10 °C + 1 ct 1%/10 °C + 2 ct
Relative humidity 20 to 80% RH µF 1% + 2 ct
Supply voltage 6.6 to 9.6V µF 0.1% + 2 ct
50/60Hz AC voltage
superposed on the test
voltage
Common mode
rejection in AC
50/60 Hz
0.5Vac µF 5% + 2 ct
0 to 600Vac µF 50dB 40dB
33
Typical Maximum
Influence
3.4. INTRINSIC UNCERTAINTY AND OPERATING UNCERTAINTY
The megohmmeters comply with standard IEC-61557, which requires that the operating uncertainty, called B, be less than 30%.
In insulation measurements, B = ± ( |A| + 1.15 √ E1² + E2² + E3² )
with A = intrinsic uncertainty
E1 = influence of the reference position ± 90°.
E2 = influence of the supply voltage within the limits indicated by the manufacturer.
E3 = influence of the temperature between 0 and 35°C.
In continuity measurement, B = ± ( |A| + 1.15 √ E1² + E2² + E3² )
3.5. POWER SUPPLY
The instrument is powered by six 1.5 V alkaline AA (LR6) batteries.
The voltage range ensuring correct operation is from 6.6 V to 9.6 V.
Life between charges
1,500 5-second insulation measurements at 1000V for R = 1 MΩ, at the rate of one measurement per minute.
3,000 5-second continuity measurements, at the rate of one measurement per minute.
3.6. ENVIRONMENTAL CONDITIONS
Indoor use.
Range of operation specified -20 to +55 °C and 20 to 80 %RH
Range of storage (without the batteries) -30 to +80 °C and 10 to 90 %RH without condensation
Altitude <2000m
Degree of pollution 2
3.7. MECHANICAL CHARACTERISTICS
Dimensions (L x W x H) 211 x 108 x 60mm
Weight approximately 850g
Inrush protection IP 54 per IEC 60529, not in operation
IK 04 per IEC 50102
Drop test per IEC 61010-1
3.8. COMPLIANCE WITH INTERNATIONAL STANDARDS
The device is compliant per IEC 61010-1 and IEC 61010-2-030, 600V CAT IV.
The device is compliant per EC 61557, parts 1, 2, 4 and 10.
3.9. ELECTROMAGNETIC COMPATIBILITY (CEM)
The instrument is compliant with standard IEC 61326-1.
34
4. MAINTENANCE
Except for the batteries, the instrument contains no parts that can be replaced by personnel who have not been
specially trained and accredited. Any unauthorized repair or replacement of a part by an “equivalent” may gravely
impair safety
4.1. CLEANING
Disconnect the unit completely and turn the rotary switch to OFF.
Use a soft cloth, dampened with soapy water. Rinse with a damp cloth and dry rapidly with a dry cloth or forced air. Do not use
alcohol, solvents, or hydrocarbons.
Do not use the instrument again until it is completely dry.
4.2. REPLACING THE BATTERIES
When the symbol starts blinking on the display unit, the batteries must all be replaced.
Disconnect the unit completely and turn the rotary switch to OFF.
Use a tool or a coin to turn the quarter-turn screw of the battery compartment cover.
Remove the battery compartment cover.
Withdraw the batteries from the compartment.
Spent primary and storage batteries must not be treated as ordinary household waste. Take them to the appropriate
collection point for recycling.
Place the new batteries in the compartment, taking care with the polarity.
Put the battery compartment cover in place and screw the quarter-turn screw back in.
35
5. WARRANTY
Except as otherwise stated, our warranty is valid for 24 months starting from the date on which the equipment was sold. Extract
from our General Conditions of Sale provided on request.
The warranty does not apply in the following cases:
Inappropriate use of the equipment or use with incompatible equipment;
Modifications made to the equipment without the explicit permission of the manufacturer’s technical staff;
Work done on the device by a person not approved by the manufacturer;
Adaptation to a particular application not anticipated in the definition of the equipment or not indicated in the user’s manual;
Damage caused by shocks, falls, or floods.
36
37
694696A02 - Ed. 5 - 06/2016 © Chauvin Arnoux - All rights reserved and reproduction prohibited
FRANCE
Chauvin Arnoux Group
190, rue Championnet
75876 PARIS Cedex 18
Tél : +33 1 44 85 44 85
Fax : +33 1 46 27 73 89
info@chauvin-arnoux.com
www.chauvin-arnoux.com
INTERNATIONAL
Chauvin Arnoux Group
Tél : +33 1 44 85 44 38
Fax : +33 1 46 27 95 69
Our international contacts
www.chauvin-arnoux.com/contacts
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