AEMC GROUNDFLEX 6474 User manual

ENGLISH User Manual
GROUNDFLEX™ ADAPTER 6474

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.
NIST traceable calibration is only possible when
the Model 6474 is connected to the Ground Tester
Model 6472.
To obtain NIST calibration (for a nominal charge), the
instrument would need to be returned to our facility,
along with your Ground Tester Model 6472.
The recommended calibration interval 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 #: ______________________________
Model #: 6474
Please fill in the appropriate date as indicated:
Date Received: _________________________________
Date Calibration Due: _______________________
Chauvin Arnoux®, Inc.
d.b.a AEMC®Instruments
www.aemc.com

2 GroundFlex™ Adapter Model 6474
Table of Contents
1. INTRODUCTION............................................................................... 3
1.1 International Electrical Symbols...........................................................4
1.2 DenitionofMeasurementCategories.................................................4
1.3 ReceivingYourShipment.....................................................................4
1.4 OrderingInformation ............................................................................5
1.4.1 AccessoriesandReplacementParts......................................5
2. GROUNDFLEX™ADAPTER ............................................................... 6
2.1 ControlFeatures ..................................................................................6
2.2 GroundFlex™Sensor............................................................................7
2.2.1 CalibrationofGroundFlex™Sensors.......................................7
2.3 MeasurementsinAUTOMode...........................................................10
2.3.1 Preparation ...........................................................................10
2.3.2 MakingaMeasurement(ResistanceofLegs) ......................11
2.3.3 OtherMeasurements ............................................................13
2.3.4 MANUALModeandSWEEPMode ......................................13
3. SPECIFICATIONS........................................................................... 15
3.1 Electrical.............................................................................................15
3.2 Mechanical.........................................................................................17
3.3 Environmental ....................................................................................17
3.4 Safety.................................................................................................17
4. MAINTENANCE ............................................................................. 18
3.1 Maintenance.....................................................................................18
3.2 Cleaning...........................................................................................18
RepairandCalibration........................................................................................19
TechnicalandSalesAssistance .........................................................................19
LimitedWarranty ................................................................................................20
WarrantyRepairs................................................................................................20

GroundFlex™ Adapter Model 6474 3
CHAPTER 1
INTRODUCTION
WARNING
Thesesafetywarningsareprovidedtoensurethesafetyofpersonnel.
Please read and complywiththeseprecautions:
Thisinstrumentisprotectedfromaccidentalvoltagesofnotmorethan•
50VwithrespecttoearthinmeasurementCat.IV.Theguaranteedlevel
ofprotectionofthisequipmentmaybecompromisedifusedinamanner
notspeciedbythemanufacturer.
Safetyistheresponsibilityoftheoperator.•
Allmetalobjectsorwiresconnectedtotheelectricalsystemshouldbe•
assumedtobelethaluntiltested.Groundingsystemsarenoexception.
Never exceed the maximum rated voltage and current, and the mea-•
surementcategory.
Neverexceedtheprotectionlimits,andalwayscomplywiththecondi-•
tionsandplaceofuse,indicatedinthespecications.
Donotusetheinstrumentoritsaccessoriesiftheyappeardamaged.•
Useaccessories thathave overvoltagecategory andservice voltages•
greaterthanorequaltothoseoftheinstrument(Cat.IV50V).Useonly
accessoriesthatcomplywithsafetystandards(IEC61010-2-031&32).
Weartheappropriateprotectivegear(insulatingbootsandgloves).•
CheckthatnoterminalisconnectedandtheswitchissettoOFFbefore•
openingthedevice.
Useonlythechargingunitsuppliedwiththeinstrumenttorechargethe•
battery.
Troubleshootingandmetrologicalvericationproceduresmustonlybe•
performedbyqualied,approvedpersonnel,orthefactory.
NOTE:• Thepotentialsonthevariousrodsusedforanearthmeasurement
maybedifferentifanearbyelectricalinstallationisdefectiveorcertain
weather conditions prevail (thunderstorms). It is up to the operator
to decide whether to continue or postpone measurements in these
situations.

4 GroundFlex™ Adapter Model 6474
1.1 International Electrical Symbols
Signifies that the instrument is protected by double or reinforced insulation.
This symbol on the instrument indicates a WARNING 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.
Ground/Earth symbol
In conformity with WEEE 2002/96/EC
1.2 Definition of Measurement Categories
Cat. I: For measurements on circuits not directly connected to theAC supply wall
outletsuchasprotectedsecondaries,signallevel,andlimitedenergycircuits.
Cat. II: Formeasurementsperformedoncircuitsdirectlyconnectedtotheelectrical
distributionsystem.Examplesaremeasurementsonhouseholdappliancesor
portabletools.
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. IV: Formeasurementsperformedattheprimaryelectricalsupply(<1000V)such
asonprimaryovercurrentprotectiondevices,ripplecontrolunits,ormeters.
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equipment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.

GroundFlex™ Adapter Model 6474 5
1.4 Ordering Information
NOTE: The GroundFlex™ Adapter Model 6474 is a factory supplied product
and only operates with the Ground Tester Model 6472 Kit - 500 ft.
GroundFlex™ Adapter Model 6474...............................................Cat. #2136.01
Includes the GroundFlex™ Adapter Model 6474, four GroundFlex™ sensors (5m/16ft) with
twelve color-coded rings, connection lead, two extension leads on H reel (black/green) with
color-coded alligator clips, six BNC extension leads, calibration loop, three C-clamps, carrying
case for meter and a user manual.
GroundFlex™ Field Kit (Model 6472 and 6474) ...........................Cat. #2136.03
Includes the GroundFlex™ Adapter Model 6474 (Cat. #2136.01 above), Ground Resistance
Tester Model 6472, rechargeable NiMH batteries, optical USB cable, power adapter 110/240V
with power cord 115V US, two 500 ft color-coded leads on spools (red/blue), two 100 ft color-
coded leads (hand-tied, green/black), one 30 ft lead (green), four T-shaped auxiliary ground
electrodes, set of ve spaded lugs, one 100 ft AEMC®tape measure, DataView®software,
ground tester workbook CD, carrying bag for meter, carrying bag for kit, hard carrying case,
product warranty and registration card and a user manual.
1.4.1 Accessories and Replacement Parts
Bag#6-CarryingBagforGroundKits............................................. Cat. #2119.82
TapeMeasure-AEMC®(100ft) .......................................................Cat. #2130.60
GroundTesterDVD/WorkbookSet...................................................Cat. #2130.64
Setoftwo,14.5"T-shapedAuxiliaryGroundElectrodes..................Cat. #2135.39
OpticalUSBCable............................................................................Cat. #2135.41
Replacement-OneGroundFlex™(5m /16ft)Sensor.......................Cat. #2135.73
Replacement-ConnectionLeadforModel6472/6474....................Cat. #2135.75
Replacement-OneBNC(15m/50ft)ExtensionLead......................Cat. #2135.76
Replacement-Setof12,GroundFlex™Rings
(red,yellow,brown,orange) .............................................................Cat. #2135.77
Replacement-GreenExtensionLead .............................................Cat. #2135.78
Replacement-BlackExtensionLead...............................................Cat. #2135.79
Replacement-Setof3,C-clamps....................................................Cat. #2135.80
Replacement-CalibrationLoop.......................................................Cat. #2135.82
Replacement-CarryingCase ..........................................................Cat. #2135.83
Replacement-SafetyAlligatorClip(black) ......................................Cat. #2140.53
Replacement-SafetyAlligatorClip(green) .....................................Cat. #2140.69
Order Accessories and Replacement Parts Directly Online
Check our Storefront at www.aemc.com/store for availability

6 GroundFlex™ Adapter Model 6474
CHAPTER 2
GROUNDFLEX™ADAPTER
2.1 Control Features
50V CAT IV
1-2-3-4
1-2-3
1-2
1
2
3
4
For Use with the
Ground Tester Model 6472
GroundFlex™
Sensor
SENSOR TURNS
SENSITIVITY
To Model 6472
Overload
INPUT
1
2
3
4
GroundFlex™Adapter
MODEL 6474
2
4
1
6
5
3
1. Inputs1through4forfourGroundFlex™sensors
2. ConnectorforconnectionleadtotheGroundTesterModel6472
3. OVERLOAD indicator
4. SelectorforNUMBEROFTURNS:1,2,3or4
5. SelectorforSENSITIVITY:x10,x1orx1/10
6. INPUTSELECTION:1,2,3,4,1-2,1-3or1-4

GroundFlex™ Adapter Model 6474 7
2.2 GroundFlex™Sensor
TheGroundFlex™sensorsareplacedaroundaconductor(pylonlegorpole)and
closedusingascrewconnector.Thisclosedloopisthenusedtomakeacontact-
freemeasurement of the currentowingin the conductor itis wrapped around.
These sensors are like current measurement clamps but are able to enclose
objectsthataremuchlarger.GroundFlex™sensorsareavailableinlengthsofup
toapprox16ft(5m)andcanbeplacedaroundobjects(suchaspylonlegs)upto
inapprox5ftdiameter(1.5m).
2.2.1 Calibration of GroundFlex™Sensors
GroundFlex™sensors need to be calibrated before the rst use. Calibration is
necessaryforanewsensor,onethatisnolongeridentied,orwhenasensorhas
beenreplaced.ThecalibrationcoefcientsarethenrecordedintheModel6474.
NOTE: Do not move or touch the GroundFlex™sensor or the calibration loop
during the calibration. This could cause errors.

8 GroundFlex™ Adapter Model 6474
Startbyidentifyingeachsensorusingtheidenticationrings(brown,red,orange,
yellow)suppliedwiththedevice.
ConnectthecalibrationloopbetweenterminalsHandEoftheModel6472.•
ConnecttheModel6472and6474togetherusingtheconnectioncable.•
ConnecttheGroundFlex• ™sensorwiththebrownringtoinput1oftheModel
6474,theonewiththeredringtoinput2,theonewiththeorangeringtoinput
3,andtheonewiththeyellowringtoinput4.
Coil the GroundFlex• ™ sensor four times around in the calibration loop and
closeitusingitsscrewconnector.Placetheconnectorasfaraspossiblefrom
thecalibrationdevice.
NOTE: • The sensors have arrows to indicate a direction.
• All sensors should face the same direction.
(clockwise or counter-clockwise)
• All sensors should have the same number of wraps.
• Sensors should encircle both leg AND ground system.
6472 6474

GroundFlex™ Adapter Model 6474 9
1. Settheswitchofthe6472toSET-UP.
2. SettheSENSOR TURNSswitchto4.
3. SettheSENSITIVITYswitchtox1.
4. SettheINPUT SELECTIONswitchto1.
1-2-3-4
1-2-3
1-2
1
2
3
4
SENSOR TURNS
SENSITIVITY INPUT
5. PresstheHz/OPTIONSbutton5times.
 ThedevicestartsbycomparingthecurrentIIntinjectedbythedeviceintothe
calibrationlooptothecurrentIAmeasuredbytheGroundFlex™sensor.Ifthey
aredifferent,the"CAL"symbolblinkstorecommendacalibration.
x 5
4
H
E
S x 11
AUTO
mA
m A
NOTE: To avoid measurement errors, do not touch the GroundFlex™sensor or
the calibration loop during the calibration.
6. Tostartthecalibration,press2nd + START.

10 GroundFlex™ Adapter Model 6474
7. ThedevicecalculatesandstoresacalibrationcoefcientfortheGroundFlex™
sensorconnectedtochannel1.
4
H
E
S x 11
AUTO
mA
m A
Thisoperationmustberepeatedforchannels2,3and4;theINPUT SELECTION
switchmustbesettothecorrespondingpositioneachtime.
Thecalibrationvaluesarenowstoredintomemory.
NOTE: Always connect the same sensor to the same input.
2.3 Measurements in AUTO Mode
2.3.1 Preparation
TheGroundFlex™AdapterModel6474isdesignedtobeusedonlywiththeModel
6472device.The twodevices must be connected using thespecial connection
cablesupplied.TheModel6474hasnoON/OFFbutton,andispoweredonlyby
theModel6472,viathisconnectioncable.
TheModel6474isintendedprimarilytomeasurethecurrentthatowsthrougha
high-voltagepylontotheground.Youcanwrapupto4legsofthepylonseachwith
aGroundFlex™sensorandmeasurethecurrentowingtoearththrougheachof
thelegsorthroughseverallegs.
Aftercalibration,theGroundFlex™sensorsmustalwaysbeconnectedtotheirre-
spectivechannels.
1. SettheswitchtoGroundFlex™.
 WhenyouconnecttheGroundFlex™AdapterModel6474tothe6472,aself-
testwillbegin.Duringthistest,theOVERLOADchecklightonthe6474islit.
2. Connecttherequirednumberofsensorstochannels1,2,3,and/or4.
NOTE: The direction of coiling of the GroundFlex™sensors around a conductor
has no effect on the measurement, but all of the GroundFlex™sensors must
be coiled in the same direction and have the same orientation (check the
arrow on the connector of the sensor) and they must all have the same
number of turns.

GroundFlex™ Adapter Model 6474 11
6474
To the Model 6472
NOTE: To increase measurement sensitivity, we recommend when possible,
wrapping a maximum number of turns (up to 4) around the structure.
3. SettheINPUT SELECTIONswitchaccordingly.Youcanmeasurethecurrent
owingthrough oneGroundFlex™ sensor (1,2, 3,or 4),or through several
sensors(1,2or1,2,3),orthroughallofthesensors(1,2,3,4).
4. Select how many times the sensor is wrapped around the conductor to be
measured(from1to4turns)usingtheSENSOR TURNSswitch.
5. SettheSENSITIVITYswitchtothedesiredsensitivity:x1/10,x1,orx10.The
choiceofsensitivitydependsontheexpectedcurrentvalue.Asaprecaution,
alwaysstartwiththelowestsensitivity,x1/10,andincreaseitasneeded.
2.3.2 Making a Measurement (Resistance of Legs)
1. PlaceauxiliaryelectrodesH (Z) and S (Y)onoppositesidesofthepylon,as
farawayaspossible(100-150ft)and,ifpossible,perpendiculartothehigh-
voltageline(depthisnotimportant).Thiswilleliminateinterferencewiththe
measurementbystray voltages or currentsinducedunder the high-voltage
line.
2. In order to avoid electromagnetic interference, it is best to unwind the full
lengthofeachcablefromthereel,tokeepthecablesasfarapartaspossible
ontheground,takingcarenottoformloops,andtoavoidplacingthecables
nearorparalleltometallicconductors(cables,rails,fences,etc.).Effectsof
interferencearemeasuredinmilli-ohms.
3. ConnecttheseauxiliaryelectrodestoterminalsH (Z) and S (Y).
4. TheterminalsES (Xv) and E (X)mustbeconnectedtoaconductingmetallic
partofthepylonlocatedabovetheGroundFlex™sensors.Thisensuresmea-
surementofthecurrentowingdownwardandtowardstheearth(otherwise,
youwouldmeasurethecurrentowingupward,fromtheearthtothetipofthe
pylon).

12 GroundFlex™ Adapter Model 6474
5. Connect the required number of GroundFlex™ sensors to channels 1, 2, 3,
and/or4(thechannelsforwhichtheyarecalibrated)andplacetheGround-
Flex™sensorsaroundthelegsofthepylon.Theorientationhasnoeffecton
themeasurement,butalloftheGroundFlex™sensorsmustbeorientedinthe
same directionandtheymust allhavethesame number of turns.
E
S
H
RS
RH
ES
1
2
3
4
6474
6472
Overhead earth wire
High-voltage
lines
4 GroundFlex™ sensors
connected with the
same orientation
WARNING: If the GroundFlex™Adapter Model 6474 is connected to the earth
tester, the earth potential connected to the terminals E (X) and ES (Xv) will
also be present at the BNC connectors of the GroundFlex™sensors and at the
connecting cable between the adapter and tester. Whenever any doubt exists
about this earth potential, the user should proceed to a voltage measurement
using the S (Y) and ES (Xv) terminals of the tester.
1. Setthe3switchesoftheGroundFlex™Adapteraccordingtotheconnection
made.
2. StartthemeasurementbypressingtheSTART/STOPbutton.
1
AUTO
k 7
mA
V
H
S
ES
E
S x 12

GroundFlex™ Adapter Model 6474 13
Todisplaythemeasurementparameters,pressDISPLAY several times.
Thedevicedisplaysthefollowingparameters:
R
SEL,US-ESanditsfrequency,ISEL,R-Act(RPASS),U-Act(US-ESanditsfrequency,
UH-Eanditsfrequency),I-Act(ISELanditsfrequency).
TomeasuretheresistancesofelectrodesH (Z) and S (Y),oriftheresistanceof
theelectrodesistoohigh,startthemeasurementbyalongpressoftheSTART/
STOPbutton.
R
H,RS,UH-E,IH-Ewillbedisplayed.
2.3.3 Other Measurements
Asexplainedabove,terminalsES (Xv) and E (X)mustbeconnectedtoametallic
partofthepylonabovetheGroundFlex™sensorinordertomeasurethecurrent
owing ISEL downward through the sensor, therefore to the earth to measure
groundresistanceoftheleg.IfconnectionsES (Xv) and E (X)areplacedbelow
theGroundFlex™sensor,thelattermeasuresthecurrentowingtowardsthetop
ofthepylonviatheoverheadearthwireatitstip,andyoucaninthiswayevaluate
thequality of this counter poise.Youcanevenmakethismeasurementwithout
movingthecontactsofES (Xv) and E (X) onthepylonbysimplypassingthe2con-
nectingcablesthroughtheGroundFlex™sensor.ThecurrentinconnectingcableE
(X) andthecurrentthroughthelegofthepylonthencanceleachotherout.
Youcanalsomeasureany leakage currents(I-Act)owingthrougheachlegof
thepyloninnormaloperationofthehigh-voltageline.Ifyounddifferentleakage
currentsineachleg,buttheycanceloutwhenaddedtogether,youcanconclude
thatthesecurrents,inducedbytherotatingeldofthehigh-voltagelines,indicate
an earthing fault of the pylon via the overhead earth wire at the tip of the
mast.
2.3.4 MANUAL Mode and SWEEP Mode
Use the Hz/OPTIONS button and ► button to change to MANUAL mode. The
followingparameterscanbemodied:
128Hzblinks• Changethetestfrequency
Testvoltageblinks• Switchbetween16and32V
Youcanalsoperformafrequencysweepandasmoothing.
Inthesweepmode,themeasurementscanbemadeatfrequenciesupto5kHz.
Onasinglepylon,frequenciesoftheorderof5kHzdonotalwaysentailinductive
effects,butthe"currentloops"formedbytheadjacentpylonsandthereturnchan-
nelthroughthegroundmayresultininductancesthatcanbedetectedonlyathigh
frequencies.

14 GroundFlex™ Adapter Model 6474
Anequivalentdiagramofthecomponentsformingthiscircuitisasfollows:
Point of injection
of the current
Overhead
earth wire
LLL
Rpylon
Next pylon
to the left
Pylon
measured
Next pylon
to the right
A measurement in sweep mode (SWEEP) of an installation like this having 10
pylonsgivesthefollowing resultsassuminganearthresistance Rpylonof10Ωfor
eachpylonandaninductanceLof550µHforthelinkviatheoverheadearthwire
atthetipofthepylons:
Impedance of the pylons
0
2
4
6
8
10
12
14
16
0100020003000 4000 5000
F (Hz)
Z (ohm)
MeasurementofapylonearthimpedancewithGroundFlex™
sensors
Conventional4polemeasurement
Measurementintothetopofapylon(iterativenetworkimpedance)

GroundFlex™ Adapter Model 6474 15
CHAPTER 3
SPECIFICATIONS
3.1 Electrical
Measuring Method:
Voltage/CurrentmeasurementwitharectangularACsignal
Short Circuit Current: > 200mAAC
Noise Suppression: >80dBatfrequenciesdifferingby20%ormorefromthe
testfrequency
Max. Overload: 250Vrms
Max. Value for RH& RS: 100kΩ
Measuring Time: Short push on START: approx.7sforrstvalueofREat
 128Hz,then3measurementspers.
Long push on START:approx.15sforrstvalueofREat
128Hz,then3measurementspers.
Pylon Measurement with GroundFlex™
Measurement
Range
0.067 to
9.999Ω
10.00 to
99.99Ω
100.0 to
999.9Ω
1.000 to
9.999kΩ
10.00 to
99.99kΩ
Resolution 0.001Ω0.01Ω0.1Ω1Ω10Ω
Test Voltage 16 or 32V user selectable
Frequency From 41 to 128Hz selectable
Resistance Measurement
Frequency From 41 to 5078Hz selectable
Accuracy ±5% of Reading + 1ct @ 128Hz
Theintrinsic error specied refers toreference conditions with atestvoltage of
32V,testfrequencyof128Hz,RH,andRS=1kΩ,noexternalvoltage.
TheoperatingerrorformeasurementsofRH,RSand REisthesameasthatspecied
for4-Poleearthresistancemeasurement.
TheoperatingerrorofACresistancemeasurementscanbelessthanthatspecied
forvoltageorcurrentbecausefrequencycharacteristicsofthevoltagechannelare
matchedtothoseofthecurrentchannel.

16 GroundFlex™ Adapter Model 6474
For test frequencies between 41 and 5087 Hz, between 1 and 4 turns of the
GroundFlex™ sensor, and a selection of 1 to 4 measurement channels, the
operatingaccuraciesarethefollowing:
SENSITIVITY and minimum ISEL minimal Operating accuracy for RS-ES
S x 1/10 ISEL > 10mA ± (10% + 4cts)
S x 1 ISEL > 5mA ± (5% + 4cts)
S x 10 ISEL > 5mA ± (5% + 4cts)
5mA > ISEL > 0.5mA ± (15% + 10cts)
Current Measurement with GroundFlex™
Measurement Range 0.0 to
99.9mA (1)
100 to
999mA
1.00 to
9.99A
10.0 to
99.9A
Resolution 0.1mA (1) 1mA 0.01A 0.1A
Frequency 16 to 400Hz
Accuracy <5% of Reading @ 50/60Hz
(1): Valid only in the SENSITIVITY x 10 setting
ThecurrentmeasureddependsonthenumberofturnsoftheGroundFlex™sensor
aroundtheconductortobemeasured.(e.g.if the GroundFlex™sensor is wrapped
4 times around a conductor carrying a current of 1A, the input signal will be the
same as if the GroundFlex™sensor were wrapped once around a conductor car-
rying a current of 4A. The operating error is therefore indicated for an input signal
current in A.tr (Ampere.turns).
TheminimumcurrentmeasureddependsonthesettingoftheSENSITIVITYswitch
asindicatedbythetablebelow:
SENSITIVITY IMIN (A.tr) Points additional error (pt-er)
x 10 0.01 5
x 1 0.04 2
x 1/10 0.16 2
Accuracy
Current (A * turn) 16 to 49Hz 50 to 99Hz 100 to 400Hz
IMIN to 0.399 ± (20% + pt-er) ± (5% + pt-er) ± (3% + pt-er)
0.4 to 39.9 ± (10% + 2ct) ± (3% + 2ct) ± (3% + 2ct)
40 to 99.9 ± (10% + 2ct) ± (3% + 2ct) ± (20% + 2ct)

GroundFlex™ Adapter Model 6474 17
3.2 Mechanical
Dimensions:10.7x9.76x5.12"(272,248x130mm)
Weight: 7lbs(3.2kg)approx
Case Material:ULV0Polypropylene
Terminals: 4mmrecessedbananajacks
Case Protection: EN60529-IP53(coverclosed)
Drop Test: Per EN 61010-1
Vibration Test: Per EN 61557-1
3.3 Environmental
Operating Temperature: 32°to113°F(0°to45°C);0to90%RH
SpeciedOperatingTemperature(1):0°to95°F(0°to35°C);0to75%RH
Storage Temperature:-40°to158°F(-40°to70°C);0to90%RH
Altitude: <3000m
(1): This range corresponds to the one defined by standard EN 61557, for which an operating error including the
quantities of influence is defined. When the device is used outside this range, 1.5%/10°C and 1.5% between
75 and 90% RH must be added to the operating error.
3.4 Safety
Electromagnetic Compatibility
ThisinstrumentsatisestheEMCandLVDdirectivesrequiredfortheCEmarking
andproductstandardIEC61326-1(Ed.97)+A1(Ed.98).
Immunityinindustrialenvironment•
Emissions in residential environment.•
ElectricalsafetyaccordingtoEN61010-1(Ed.2of2001)
MeasurementaccordingtoEN61557(Ed.2of2007)parts1,4and5.
Cat.IV,50V
PollutionDegree2
*All specications are subject to change without notice

18 GroundFlex™ Adapter Model 6474
CHAPTER 3
MAINTENANCE
3.1 Maintenance
Please make sure that you have read and fully understand the WARNING
section on page 3.
Toavoid electrical shock,do not attemptto perform anyservicing unless•
youarequaliedtodoso.
Toavoidelectricalshockand/ordamagetotheinstrument,donotgetwater•
orotherforeignagentsintothecase.
Turn the instrument OFF and disconnect the unit from all circuits before•
openingthecase.
Usespeciedsparepartsonly.•
3.2 Cleaning
Disconnect the instrument from any source of electricity.
Useasoftclothlightlymoistenedwithsoapywater.Wipewithamoistclothand
thendrywithadrycloth.Neverusealcohol,solventsorhydrocarbons.