AEMC 6240 User manual

MICRO-OHMMETER 6240
ENGLISH User Manual
NOTE: For instruments with serial numbers
lower than 116339SEDV, terminals C1 and P1
are red, and C2 and P2 are black

Statement of Compliance
Chauvin Arnoux®, Inc. d.b.a. AEMC®Instruments
certifies that this instrument has been calibrated
using standards and instruments traceable to
international standards.
We guarantee that at the time of shipping your
instrument has met its published specifications.
An NIST traceable certificate may be
requested at the time of purchase, or obtained
by returning the instrument to our repair and
calibration facility, for a nominal charge.
The recommended calibration interval for this
instrument is 12 months and begins on the date of
receipt by the customer. For recalibration, please
use our calibration services. Refer to our repair
and calibration section at www.aemc.com.
Serial #: ________________________________
Catalog #: 2129.80
Model #: 6240
Please fill in the appropriate date as indicated:
Date Received: _________________________________
Date Calibration Due: _______________________
Chauvin Arnoux®, Inc.
d.b.a AEMC®Instruments
www.aemc.com

Table of Contents
1. INTRODUCTION ................................................................................. 4
1.1 International Electrical Symbols................................................5
1.2 DenitionofMeasurementCategories .....................................5
1.3 ReceivingYourShipment..........................................................5
1.4 OrderingInformation.................................................................6
1.4.1 AccessoriesandReplacementParts............................6
2. PRODUCT FEATURES......................................................................... 7
2.1 Description................................................................................7
2.2 Applications ..............................................................................8
2.3 KeyFeatures ............................................................................8
2.4 ControlFeatures .......................................................................9
2.5 ButtonFunctions.....................................................................10
2.6 DisplaySymbols ..................................................................... 11
3. SPECIFICATIONS............................................................................. 12
3.1 Electrical .................................................................................12
3.2 Mechanical..............................................................................13
3.3 Environmental.........................................................................14
3.4 Safety......................................................................................14
4. OPERATION..................................................................................... 15
4.1 PrecautionsBeforeUse..........................................................15
4.2 InstrumentConguration(SET-UPmode) ..............................15
4.3 ResistanceMeasurements .....................................................16
4.3.1 MeasurementReadings..............................................17
4.3.2 ConnectionsandReadings.........................................17
4.3.3 Test Lead Connection .................................................18
4.4 RepetitiveMeasurements .......................................................18
4.5 MeasuringVeryLowResistance ............................................19
4.6 AutomaticRecording ..............................................................20
4.7 StoringResultsintoMemory...................................................21

Micro-Ohmmeter Model 6240 3
4.8 RecallingResultsfromMemory..............................................22
4.9 ErasingMeasurementsfromMemory.....................................23
4.9.1 ErasingSelectedMeasurements................................23
4.9.2 ErasingAllMeasurements ..........................................23
5. DATAVIEW®SOFTWARE................................................................... 24
5.1 InstallingDataView®................................................................24
5.2 Micro-ohmmeterControlPanel...............................................26
6. TROUBLESHOOTING ........................................................................ 27
6.1 ErrorMessages ......................................................................27
6.1.1 VoltagePresent ..........................................................27
6.1.2 Overrange...................................................................28
6.1.3 NoisyMeasurement....................................................28
6.1.4 Overheating ................................................................28
7. MAINTENANCE................................................................................ 29
7.1 Warning..................................................................................29
7.2 Cleaning..................................................................................29
7.3 Charging/RechargingtheBattery ...........................................30
7.4 BatteryandFuseReplacement ..............................................31
RepairandCalibration ....................................................................32
TechnicalandSalesAssistance......................................................32
Limited Warranty .............................................................................33
WarrantyRepairs ............................................................................33

4 Micro-Ohmmeter Model 6240
CHAPTER 1
INTRODUCTION
WARNING
These safety warnings are provided to ensure the safety of
personnelandproperoperationoftheinstrument.
• Thisinstrumentisprotectedfromaccidentalvoltagesofnot
more than 50V with respect to earth in measurement Cat-
egoryIII.
• Donotattempttoperformanytestswiththisinstrumentuntil
youhavereadtheusermanual.
• Tests are to be carried out on de-energized circuits only!
Never connect the unit to a live circuit.
• Make sure that none of the input terminals are connected
andthattheswitchissettoOFFbeforepluggingintheAC
powertorechargethebatteryoftheinstrument.
• Makesuretheinternalbatteryisfullychargedpriortotesting.
If the instrument has been left unused for several months,
rechargethebattery.
• If the case needs cleaning, do not use any alcohol or oil
based cleaners. Preferably use soapy water with a damp
clothorsponge.Donotimmersethe6240micro-ohmmeter
inwater.
• Use connection accessories of which the overvoltage cat-
egory and the service voltage are greater than or equal to
those of the measuring instrument (50V CAT III). Use only
accessoriesthatcomplywithsafetystandards(IEC61010-2-
031).
• The test leads and measuring wires must be in good
conditionandshouldbereplacedifthereisanyevidenceof
deterioration(insulationsplit,burnt,etc.).
• Troubleshooting and metrological verication procedures
mustonlybeperformedbyqualied,approvedpersonnel,or
thefactory.

Micro-Ohmmeter Model 6240 5
1.1 International Electrical Symbols
Signifies that the instrument is protected by double or reinforced insulation.
This symbol on the instrument indicates a WARNING and that the operator must refer
to the user manual for instructions before operating the instrument. In this manual,
the symbol preceding instructions indicates that if the instructions are not followed,
bodily injury, installation/sample and/or product damage may result.
Risk of electric shock. The voltage at the parts marked with this symbol may
be dangerous.
When disposed of, this product must be sorted for the recycling of electrical
and electronic equipment in accordance with WEEE directive 2002/96/EC.
1.2 Definition of Measurement Categories
CAT IV: For measurements performed at the primary electrical supply
(<1000V) such as on primary overcurrent protection devices,
ripplecontrolunits,ormeters.
CAT III: For measurements performed in the building installation at
the distribution level such as on hardwired equipment in xed
installationandcircuitbreakers.
CAT II: For measurements performed on circuits directly connected to
the electrical distribution system. Examples are measurements
onhouseholdappliancesorportabletools.
1.3 Receiving Your Shipment
Uponreceivingyourshipment,makesurethatthecontentsareconsistent
withthepackinglist.Notifyyourdistributorofanymissingitems.Iftheequip-
mentappearstobedamaged,leaclaimimmediatelywiththecarrierand
notifyyourdistributoratonce,givingadetaileddescriptionofanydamage.
Savethedamagedpackingcontainertosubstantiateyourclaim.
NOTE: Charge the instrument fully before use.

6 Micro-Ohmmeter Model 6240
1.4 Ordering Information
Micro-ohmmeter Model 6240............................................ Cat. #2129.80
Includes extra large tool bag, set of two 10ft Kelvin clips (10A - Hippo), set of two 10ft Kelvin
probes (1A - Spring Loaded), optical USB cable, US 115V power cord, two spare fuses
(12.5A), NiMH rechargeable battery pack, and USB stick supplied with product user manual
and DataView®software.
1.4.1 Accessories and Replacement Parts
Kelvinclips(10A-Hippo),10ftcolor-codedleads
withspadelugterminations................................................. Cat. #1017.84
Kelvinclips(10A-Hippo),20ftcolor-codedleads
withspadelugterminations................................................. Cat. #2118.70
KelvinProbes(1A-SpringLoaded),10ftwith4mmbanana
plugtermination(includessetof5forkterminals)............... Cat. #2118.73
KelvinProbes(1A-SpringLoaded),20ftwith4mmbanana
plugtermination(includessetof5forkterminals)............... Cat. #2118.74
KelvinProbesPistolGrip10ft(10A)SpringLoaded........... Cat. #2118.75
KelvinProbesPistolGrip20ft(10A)SpringLoaded........... Cat. #2118.76
KelvinProbes10ft(10A)SpringLoaded ........................... Cat. #2118.77
KelvinProbes20ft(10A)SpringLoaded ............................ Cat. #2118.78
KelvinClips10ft(1-10A)..................................................... Cat. #2118.79
KelvinClips20ft(1-10A)..................................................... Cat. #2118.80
Thermo-HygrometerModelCA846 .....................................Cat. #2121.24
OpticalUSBCable...............................................................Cat. #2135.41
KelvinClips25ft(200A-Hippo)..........................................Cat. #2129.72
KelvinClips50ft(200A-Hippo)..........................................Cat. #2129.73
Battery–ReplacementNiMH6V9000mAH
forModels6240&6250 ......................................................Cat. #2129.91
Fuse,setof5,12.5A/500V,6.3x32mm ............................. Cat. #2129.92
ExtraLargeClassicToolBag ..............................................Cat. #2133.73
Inverter–12VDCto120VAC200Wattforvehicleuse......... Cat. #2135.43
115VPowerCordUS .......................................................... Cat. #5000.14
Order Accessories and Replacement Parts Directly Online
Check our Storefront at www.aemc.com/store for availability

Micro-Ohmmeter Model 6240 7
CHAPTER 2
PRODUCT FEATURES
2.1 Description
The Micro-ohmmeter Model 6240 is used to perform low resistance
measurementsfrom5μΩto 400Ω.Therearesixrangeswithtestcurrents
from10mAto10A.
Thefrontendofthemicro-ohmmeteremploysafour-wireKelvincongu-
ration,whicheliminatestestleadresistanceforameasurementaccuracy
of0.25%.Abuilt-incircuitltersoutACsignals.
TheMicro-ohmmeterModel6240ispackagedinasealedeldcasewell
suitedforshopandelduse.Powerissuppliedbyalong-lifeNiMHbattery
packwithabuilt-inrecharger(110/220V).
Thelarge,easy-to-readliquidcrystaldisplayis2.25x4.00".Itdisplaysthe
valueofresistance,currentorvoltagetest,polarityandbatterycharge.
Foroperatorsafetyandinstrumentprotection,themicro-ohmmeterisfuse
protectedattheinputs.Onefuse,accessiblefromthefrontpanel,protects
againststoredenergyininductiveloads.
Enhanced internal circuitry protects against possible inductive kickback
whenthecurrentisshuto󰀨.
Abuilt-inthermalswitchprotectsthemicro-ohmmeteragainstoverheating
onthe10Arangewhenincontinuoususe.

8 Micro-Ohmmeter Model 6240
2.2 Applications
Someofthemorepopularandmostfrequentusesofthemicro-ohmmeter
areinapplicationsfor:
• Checkingmetalliccoatingresistance,especiallyinaeronautics
• Groundconnectionsandcontinuitymeasurement
• Resistancemeasurementsonmotorsandsmalltransformers
• Contactresistancemeasurementsonbreakersandswitches
• Componentmeasurement
• Electricalcableresistancemeasurement
• Mechanicalbondtests
• Wire to terminal connections
• Aircraftandrailbonds
2.3 Key Features
• Measuresfrom5µΩto 400Ω
• Testcurrentselectionfrom10mAto10A
• Manualtemperaturecompensation(withDataView®software)
• Frontpanelpolarityreversefunction
• Storesupto99testresults
• Operatorsafetybyautomaticdischargeofresidualchargeonthe
equipmentundertest
• Instantaneous,continuousormultipletestoperation
• Autostoreofmultipletestresults
• Internal,rechargeablebatteriesconductupto850,10Atests
• Abuilt-inbatterypackrechargerrechargesthebatteriesby
connectingtotheACline(110V-230V,50/60Hz)usingastandard
line cord
• 4-Wiremeasurementwithautomaticcompensationof
undesirablevoltagesandleadresistance
• Largemulti-functionbacklitdisplay
• Directdisplayofthemeasurementwithunits,rangeandtest
current
• Rugged,sealedcase