Kyoritsu Electrical Instruments Works, Ltd. 4200 User manual

MODEL 4200/KEW 4202
DIGITAL EARTH CLAMP TESTER
INSTRUCTION MANUAL
KYORITSU ELECTRICAL INSTRUMENTS
WORKS，LTD.
MODEL4200 KEW4202

Contents
 1 .Safetywarnings ............................................................................................. 1
 2 .Features .......................................................................................................... 3
 3 .Specification .................................................................................................. 4
 4 .Instrumentlayout ........................................................................................... 6
 5 .Measurementprinciple................................................................................... 7
 6 .Gettingstarted................................................................................................. 9
 7 .Measuringmethod ...................................................................................... 10
 7 - 1 Normalmeasurementofcurrent .......................................................... 11
 7 - 2 Measurementofbalanceleakagecurrent ......................................... 11
 7 - 3 Measurementofearthresistance ........................................................ 12
 8 .Otherfunctions ............................................................................................ 13
 8 - 1 Autopower-offfunction ........................................................................ 13
 8 - 2 Dataholdfunction ................................................................................. 13
 8 - 3 Buzzerfunction ...................................................................................... 13
 8 - 4 Backlightfunction ................................................................................... 13
 8 - 5 Memoryfunction ..................................................................................... 14
 8 - 6 BluetoothCommunicationFunction(KEW 4202 only)....................... 15
 9 .Batteryreplacement .................................................................................... 17
10
.PairingwithBluetoothcompatibledevices(KEW 4202 )......................... 18
11
.FeaturesofKEWSmart(KEW 4202 ) ......................................................... 19
  1  
1. Safety Warnings
This instrument has been designed, manufactured and tested according to IEC
61010 : Safety requirements for Electronic Measuring apparatus, and delivered
in the best condition after passing quality control tests. This instruction manual
containswarningsandsafetyprocedureswhichhavetobeobservedbytheuserto
ensuresafeoperationoftheinstrumentandtomaintainitinsafecondition.
Therefore,readthroughtheseoperatinginstructionsbeforeusingtheinstrument.
#WARNING
󱾀
 Read through and understand the instructions contained in this manual
beforeusingtheinstrument.
󱾀  Keepthemanualathandtoenablequickreferencewhenevernecessary.
󱾀  Theinstrumentistobeusedonlyinitsintendedapplications.
󱾀  Understandandfollowallthesafetyinstructionscontainedinthemanual.
Itisessentialthattheaboveinstructionsareadheredto.Failuretofollowthe
above instructions may cause injury, instrument damage and/or damage to
equipmentundertest.
○ Thesymbol
#
indicated on theinstrument means thatthe user mustrefer
totherelatedpartsinthemanualforsafeoperationoftheinstrument.Itis
essential to read the instructions wherever the
#
 symbol appears in the
manual.
#

DANGER
:is reserved for conditions and actions that are likely to cause
seriousorfatalinjury.
#

WARNING
:isreservedforconditionsandactionsthatcancauseseriousor
fatalinjury.
#

CAUTION
:isreservedforconditionsandactionsthatcancauseinjuryor
instrumentdamage.
○ Followingsymbolsareusedontheinstrument.Attentionshouldbepaidtoeach
symboltoensureyoursafety.
#
This symbol indicates that the user must refer to the explanations in the
instructionmanual.

  Thissymbolindicatesthattheinstrumentisprotectedbydoubleorreinforced
insulation.
Thissymbolindicatesthatthisinstrumentcanclamponbareconductors.
〜
ThissymbolindicatesAC.

Contents
 1 .Safetywarnings ............................................................................................. 1
 2 .Features .......................................................................................................... 3
 3 .Specification .................................................................................................. 4
 4 .Instrumentlayout ........................................................................................... 6
 5 .Measurementprinciple................................................................................... 7
 6 .Gettingstarted................................................................................................. 9
 7 .Measuringmethod ...................................................................................... 10
 7 - 1 Normalmeasurementofcurrent .......................................................... 11
 7 - 2 Measurementofbalanceleakagecurrent ......................................... 11
 7 - 3 Measurementofearthresistance ........................................................ 12
 8 .Otherfunctions ............................................................................................ 13
 8 - 1 Autopower-offfunction ........................................................................ 13
 8 - 2 Dataholdfunction ................................................................................. 13
 8 - 3 Buzzerfunction ...................................................................................... 13
 8 - 4 Backlightfunction ................................................................................... 13
 8 - 5 Memoryfunction ..................................................................................... 14
 8 - 6 BluetoothCommunicationFunction(KEW 4202 only)....................... 15
 9 .Batteryreplacement .................................................................................... 17
10
.PairingwithBluetoothcompatibledevices(KEW 4202 )......................... 18
11
.FeaturesofKEWSmart(KEW 4202 ) ......................................................... 19
  1  
1. Safety Warnings
This instrument has been designed, manufactured and tested according to IEC
61010 : Safety requirements for Electronic Measuring apparatus, and delivered
in the best condition after passing quality control tests. This instruction manual
containswarningsandsafetyprocedureswhichhavetobeobservedbytheuserto
ensuresafeoperationoftheinstrumentandtomaintainitinsafecondition.
Therefore,readthroughtheseoperatinginstructionsbeforeusingtheinstrument.
#WARNING
󱾀
 Read through and understand the instructions contained in this manual
beforeusingtheinstrument.
󱾀  Keepthemanualathandtoenablequickreferencewhenevernecessary.
󱾀  Theinstrumentistobeusedonlyinitsintendedapplications.
󱾀  Understandandfollowallthesafetyinstructionscontainedinthemanual.
Itisessentialthattheaboveinstructionsareadheredto.Failuretofollowthe
above instructions may cause injury, instrument damage and/or damage to
equipmentundertest.
○ Thesymbol
#
indicated on theinstrument means thatthe user mustrefer
totherelatedpartsinthemanualforsafeoperationoftheinstrument.Itis
essential to read the instructions wherever the
#
 symbol appears in the
manual.
#

DANGER
:is reserved for conditions and actions that are likely to cause
seriousorfatalinjury.
#

WARNING
:isreservedforconditionsandactionsthatcancauseseriousor
fatalinjury.
#

CAUTION
:isreservedforconditionsandactionsthatcancauseinjuryor
instrumentdamage.
○ Followingsymbolsareusedontheinstrument.Attentionshouldbepaidtoeach
symboltoensureyoursafety.
#
This symbol indicates that the user must refer to the explanations in the
instructionmanual.

  Thissymbolindicatesthattheinstrumentisprotectedbydoubleorreinforced
insulation.
Thissymbolindicatesthatthisinstrumentcanclamponbareconductors.
〜
ThissymbolindicatesAC.

  2  
#
DANGER
󱾀  Nevermakemeasurementonacircuitinwhichtheelectricalpotentialexceeds
AC
300 V.
󱾀  Do not make measurement when thunder is rumbling. Stop measurement and
takeofftheinstrumentfromtheobjectundertest.
󱾀  Donotattempttomakemeasurementinthepresenceofflammablegasses.
Otherwise,theuseoftheinstrumentmaycausesparking,whichcanleadtoan
explosion.
󱾀 Toavoidelectricalshockbytouchingtheequipmentundertestorits
surroundings,besuretowearinsulatedprotectivegear.
󱾀  Transformerjawsaremadeofmetalandtheirtipsarenotcompletelyinsulated.
Beespeciallycarefulaboutthepossibleshortingwheretheequipmentundertest
hasexposedmetalparts.
󱾀 Neverattempttousetheinstrumentifitssurfaceoryourhandiswet.
󱾀  Donotexceedthemaximumallowableinputofanymeasuringrange.
󱾀   Donotmeasureacurrentover 30 A.Transformerjawsmayheattocauseafireor
deformation of molding parts, which will degrade insulation. When clamping the
conductors on which over
30 A flowing and " " is displayed on the LCD, stop
measurementimmediatelyandtakeofftheinstrumentfromtheconductorundertest.
󱾀  NeveropentheBatterycoverduringameasurement.
󱾀  Whenthetransformerjawsareworntothewearline(seethefigurebelow),stop
theuseoftheinstrument.
#
WARNING
󱾀 Neverattempttomakeanymeasurementifanyabnormalconditions,suchasa
brokencoverorexposedmetalpartsarepresentontheinstrument.
󱾀 Donotinstallsubstitutepartsormakeanymodificationtotheinstrument.Return
theinstrumenttoyourlocalKYORITSUdistributorforrepairorre-calibration.
󱾀 Donottrytoreplacethebatteriesifthesurfaceoftheinstrumentiswet.
󱾀 Ensure that the instrument is switched off when opening the Battery cover for
batteryreplacement.
󱾀 AlwaysbesuretokeepyourfingersandhandsbehindtheSafetybarrier.
(seethefigurebelow)Otherwise,usermaybeexposedtothedangerof
electricalshock.
#
CAUTION
󱾀 PresstheFunctionbuttonandconfirmtheappropriatefunctionisselectedbefore
startingameasurement.
󱾀 Donotexposetheinstrumenttodirectsunlight,hightemperaturesandhumidity
ordew.
󱾀 PressthePowerbuttonandturnofftheinstrumentafteruse.Whentheinstrument
will not be in use for a long period, place it in storage after removing the
batteries.
󱾀 Useadampclothwithwaterorneutraldetergentforcleaningtheinstrument.Do
notuseabrasivesorsolvents.
󱾀 Take sufficient care not to apply shock such as drop. Otherwise, precisely
adjustedTransformerjawswillbedamaged.
󱾀 BecarefulnottopinchsomeforeignsubstanceswiththeTransformerjawtips.
󱾀  Careshouldbetakennottopinchyourfingerswhenopeningorclosingthe
Jaws.
󱾀 PassyourhandthroughtheStrapbandandusetheinstrument.
  3  
2. Features
Thisinstrumentisadigitalclamp-onearthresistancetester,anditisusedinmulti-
earthedsystems.Canmeasuretheearthresistancebysimplyclampingaroundthe
earthedwires.
This instrument also equips AC current function to measure current up to
30 A
sameasourtraditionalleakageclampmeters.
Asingleearthingcannotbemeasured.(onlyformultiple-earthingsystem)
󱾀 Widemeasuringrange(Auto-ranging)
Earth/groundresistance Max.
1500 Ω  Min.resolution 0 . 01 Ω
ACcurrent Max. 30 A Min.resolution 0 . 1 mA
󱾀 Noisecheckfunction
Afunctiontodetectcurrent,whicheffectsonanearthresistancemeasurement
anddisplaytheNOISEsymbolontheLCD.
󱾀 TrueRMS
AccuratetrueRMSreadingsofACcurrentwithdistortedwaveform.
󱾀 Autopower-offfunction
A function to prevent the instrument from being left turned on and conserve
batterypower.
󱾀 Dataholdfunction
Afunctiontofreezethemeasuredvalueonthedisplay.
󱾀 Buzzerfunction
Afunctiontogiveaudiblewarningtotheuserwhenthemeasurementresultis
10 Ω orless.
󱾀 Backlightfunction
Afunctiontofacilitateworkingatdimlylitareas.
󱾀 Memoryfunction
Afunctiontosaveanddisplaythemeasurementresult.
󱾀 Designedtofollowingsafetystandard.
IEC
61010 - 1 (CAT.IV 300 VPollutiondegree 2 ),IEC 61010 - 2 - 032
󱾀 Thisinstrumentisprotectedbydoubleorreinforcedinsulation

.
● BluetoothCommunicationFunction(KEW 4202 only)
Remote checking of measurements is possible without accessing KEW
4202 
unitbyconnectingKEW
4202 andAndroiddevicesviaBluetooth.

  2  
#
DANGER
󱾀  Nevermakemeasurementonacircuitinwhichtheelectricalpotentialexceeds
AC
300 V.
󱾀  Do not make measurement when thunder is rumbling. Stop measurement and
takeofftheinstrumentfromtheobjectundertest.
󱾀  Donotattempttomakemeasurementinthepresenceofflammablegasses.
Otherwise,theuseoftheinstrumentmaycausesparking,whichcanleadtoan
explosion.
󱾀 Toavoidelectricalshockbytouchingtheequipmentundertestorits
surroundings,besuretowearinsulatedprotectivegear.
󱾀  Transformerjawsaremadeofmetalandtheirtipsarenotcompletelyinsulated.
Beespeciallycarefulaboutthepossibleshortingwheretheequipmentundertest
hasexposedmetalparts.
󱾀 Neverattempttousetheinstrumentifitssurfaceoryourhandiswet.
󱾀  Donotexceedthemaximumallowableinputofanymeasuringrange.
󱾀   Donotmeasureacurrentover 30 A.Transformerjawsmayheattocauseafireor
deformation of molding parts, which will degrade insulation. When clamping the
conductors on which over
30 A flowing and " " is displayed on the LCD, stop
measurementimmediatelyandtakeofftheinstrumentfromtheconductorundertest.
󱾀  NeveropentheBatterycoverduringameasurement.
󱾀  Whenthetransformerjawsareworntothewearline(seethefigurebelow),stop
theuseoftheinstrument.
#
WARNING
󱾀 Neverattempttomakeanymeasurementifanyabnormalconditions,suchasa
brokencoverorexposedmetalpartsarepresentontheinstrument.
󱾀 Donotinstallsubstitutepartsormakeanymodificationtotheinstrument.Return
theinstrumenttoyourlocalKYORITSUdistributorforrepairorre-calibration.
󱾀 Donottrytoreplacethebatteriesifthesurfaceoftheinstrumentiswet.
󱾀 Ensure that the instrument is switched off when opening the Battery cover for
batteryreplacement.
󱾀 AlwaysbesuretokeepyourfingersandhandsbehindtheSafetybarrier.
(seethefigurebelow)Otherwise,usermaybeexposedtothedangerof
electricalshock.
#
CAUTION
󱾀 PresstheFunctionbuttonandconfirmtheappropriatefunctionisselectedbefore
startingameasurement.
󱾀 Donotexposetheinstrumenttodirectsunlight,hightemperaturesandhumidity
ordew.
󱾀 PressthePowerbuttonandturnofftheinstrumentafteruse.Whentheinstrument
will not be in use for a long period, place it in storage after removing the
batteries.
󱾀 Useadampclothwithwaterorneutraldetergentforcleaningtheinstrument.Do
notuseabrasivesorsolvents.
󱾀 Take sufficient care not to apply shock such as drop. Otherwise, precisely
adjustedTransformerjawswillbedamaged.
󱾀 BecarefulnottopinchsomeforeignsubstanceswiththeTransformerjawtips.
󱾀  Careshouldbetakennottopinchyourfingerswhenopeningorclosingthe
Jaws.
󱾀 PassyourhandthroughtheStrapbandandusetheinstrument.
  3  
2. Features
Thisinstrumentisadigitalclamp-onearthresistancetester,anditisusedinmulti-
earthedsystems.Canmeasuretheearthresistancebysimplyclampingaroundthe
earthedwires.
This instrument also equips AC current function to measure current up to
30 A
sameasourtraditionalleakageclampmeters.
Asingleearthingcannotbemeasured.(onlyformultiple-earthingsystem)
󱾀 Widemeasuringrange(Auto-ranging)
Earth/groundresistance Max.
1500 Ω  Min.resolution 0 . 01 Ω
ACcurrent Max. 30 A Min.resolution 0 . 1 mA
󱾀 Noisecheckfunction
Afunctiontodetectcurrent,whicheffectsonanearthresistancemeasurement
anddisplaytheNOISEsymbolontheLCD.
󱾀 TrueRMS
AccuratetrueRMSreadingsofACcurrentwithdistortedwaveform.
󱾀 Autopower-offfunction
A function to prevent the instrument from being left turned on and conserve
batterypower.
󱾀 Dataholdfunction
Afunctiontofreezethemeasuredvalueonthedisplay.
󱾀 Buzzerfunction
Afunctiontogiveaudiblewarningtotheuserwhenthemeasurementresultis
10 Ω orless.
󱾀 Backlightfunction
Afunctiontofacilitateworkingatdimlylitareas.
󱾀 Memoryfunction
Afunctiontosaveanddisplaythemeasurementresult.
󱾀 Designedtofollowingsafetystandard.
IEC
61010 - 1 (CAT.IV 300 VPollutiondegree 2 ),IEC 61010 - 2 - 032
󱾀 Thisinstrumentisprotectedbydoubleorreinforcedinsulation

.
● BluetoothCommunicationFunction(KEW 4202 only)
Remote checking of measurements is possible without accessing KEW
4202 
unitbyconnectingKEW
4202 andAndroiddevicesviaBluetooth.

  4  
3. Specification
󱾀 Operatingsystem Earthresistancefunction:Constantvoltageinjection,
    Currentdetection,
    
(Frequency:Approx. 2400 Hz)
    DualIntegration

ACcurrentfunction:SuccessiveApproximation(True-RMS)
󱾀 Display Liquidcrystaldisplaywithamaximumcountof 2099
󱾀 Over-rangeindication "OL"isdisplayedwheninputexceedstheupperlimit
ofthemeasuringrange
󱾀 Responsetime Earthresistancefunction:Approx. 7 seconds
  ACcurrentfunction:Approx.
2 seconds
󱾀 Samplerate Approx.oncepersecond
󱾀 Locationforuse Altitude 2000 morless,Indoor/outdooruse
󱾀 IPprotectiondegree IP 40
󱾀  Temperature&humidityrange  23 ℃ ± 5 ℃ /Relativehumidity 85 %orless
(guaranteedaccuracy)
（ nocondensation ）
󱾀
Operatingtemperature& - 10 ℃ to 40 ℃ /Relativehumidity 85 %orless
humidityrange (nocondensation)
󱾀 Storagetemperature& - 20 ℃ to 60 ℃ /Relativehumidity 85 %orless
humidityrange
（ withoutbatteries,nocondensation ）
󱾀
Powersource DC 6 V:R 6 P(sizeAAmanganesebattery)x 4 pcs,or
 LR
6  (sizeAAalkalinebattery)x 4 pcs
󱾀 Currentconsumption MODEL 4200 :Approx. 50 mA(max. 100 mA)
  KEW
4202 :Approx. 90 mA(max. 140 mA)
󱾀 Measurementtime MODEL 4200 :Approx. 12 hours(whenusingR 6 P),or
24 hours(whenusingLR 6 )
  KEW
4202 :Approx. 5 hours (whenusing R 6 P),or
21 hours(whenusingLR 6 )
󱾀 Measuringrangeandaccuracy
Function Range Resolution Measuringrange Accuracy
Earth
resistance
(Auto-ranging)
20 Ω 0 . 01 Ω 0 . 00 〜 20 . 99 Ω ± 1 . 5 % ± 0 . 05 Ω
200 Ω 0 . 1 Ω
16 . 0 〜 99 . 9 Ω ± 2 % ± 0 . 5 Ω
100 . 0 〜 209 . 9 Ω ± 3 % ± 2 Ω
1500 Ω
1 Ω
160 〜 399 Ω ± 5 % ± 5 Ω
400 〜 599 Ω ± 10 % ± 10 Ω
10 Ω 600 〜 1580 Ω ※ 
ACcurrent(AC)
(
50 / 60 Hz)
(Auto-ranging)
100 mA 0 . 1 mA 0 . 0 〜 104 . 9 mA
± 2 % ± 0 . 7 mA
(sinewave)
1000 mA 1 mA 80 〜 1049 mA
± 2 %
(sinewave)
10 A 0 . 01 A 0 . 80 〜 10 . 49 A
30 A 0 . 1 A 8 . 0 〜 31 . 5 A
*Crestfactor ≦ 2 . 5 Accuracyatsinewave+ 1 %( 50 Hz/ 60 Hz,peakvalueshallnotexceed 60 A)
*Inthefollowingcases,zerowillbedisplayedontheLCD.
-At 20 Ω rangeofEarthresistancefunction: 0 . 04 Ω orless
-At 100 mArangeofACAfunction: 0 . 4 mAorless
*Arangeshiftstoupperrangewhentheinputexceeds 105 %oftheselectedrange,andshifts
tothelowerrangewhentheinputfallsunder 80 %oftherange.
  5  
󱾀 Autopower-off Turns power off about 10 minutesafterthelast
buttonoperation.
󱾀 Applicablestandards IEC 61010 - 1 ,IEC 61010 - 2 - 030 (CAT.IV 300 VPollutiondegree 2 )
 IEC 61010 - 2 - 032
 IEC 61326 - 2 - 2 (EMCstandard)
󱾀 Environmentalstandard EN 50581 Monitoringandcontrolinstruments
󱾀 Externalcommunication BluetoothVer 2 . 1 +EDRClass 2
method
󱾀 Withstandvoltage AC 5160 Vrms/ 5 seconds
 Between the TransformerjawsfittedpartsandCase
enclosure(exceptforjaws)
󱾀 Insulationresistance 50 M Ω ormoreat 1000 V
 Between the TransformerjawsfittedpartsandCase
enclosure(exceptforjaws)
󱾀 Conductorsize Approx. 32 mmindiametermax.
󱾀 Dimension 246 (L)x 120 (W)x 54 (D)mm
󱾀 Weight Approx. 780 g(includingbatteries)
󱾀 Accessories BatteryR 6 P: 4 pcs(MODEL 4200 )
  LR 6 : 4 pcs(KEW 4202 )
 Instructionmanual  : 1 pce
 Resistorforoperationcheck: 1 pce
 (MODEL 8304 )
 HardcaseMODEL 9166  : 1 pce(MODEL 4200 )
 MODEL 9167  : 1 pce(KEW 4202 )
<Supplementalremarks>
○ Effectivevalue(RMS)
 Most alternating currents and voltages are expressed in effective values, which are also
referred to as RMS (Root-Mean-Square) values. The effective value is the square root of
the average of square of alternating current or voltage values. Many clamp meters using
a conventional rectifying circuit have "RMS" scales for AC measurement. The scales are,
however,actuallycalibratedintermsoftheeffectivevalueofasinewavethoughtheclamp
meterisrespondingtotheaveragevalue.Thecalibrationisdonewithaconversionfactorof
1 . 111 forsinewave,whichisfoundbydividingtheeffectivevaluebytheaveragevalue.
 Theseinstrumentsarethereforeinerroriftheinputvoltageorcurrenthassomeothershape
thansinewave.
○ CF(CrestFactor)isfoundbydividingthepeakvaluebytheeffectivevalue.
Examples:
Sinewave:CF= 1 . 414 Squarewavewitha 1 : 9 dutyratio:CF= 3

  4  
3. Specification
󱾀 Operatingsystem Earthresistancefunction:Constantvoltageinjection,
    Currentdetection,
    
(Frequency:Approx. 2400 Hz)
    DualIntegration

ACcurrentfunction:SuccessiveApproximation(True-RMS)
󱾀 Display Liquidcrystaldisplaywithamaximumcountof 2099
󱾀 Over-rangeindication "OL"isdisplayedwheninputexceedstheupperlimit
ofthemeasuringrange
󱾀 Responsetime Earthresistancefunction:Approx. 7 seconds
  ACcurrentfunction:Approx.
2 seconds
󱾀 Samplerate Approx.oncepersecond
󱾀 Locationforuse Altitude 2000 morless,Indoor/outdooruse
󱾀 IPprotectiondegree IP 40
󱾀  Temperature&humidityrange  23 ℃ ± 5 ℃ /Relativehumidity 85 %orless
(guaranteedaccuracy)
（ nocondensation ）
󱾀
Operatingtemperature& - 10 ℃ to 40 ℃ /Relativehumidity 85 %orless
humidityrange (nocondensation)
󱾀 Storagetemperature& - 20 ℃ to 60 ℃ /Relativehumidity 85 %orless
humidityrange
（ withoutbatteries,nocondensation ）
󱾀
Powersource DC 6 V:R 6 P(sizeAAmanganesebattery)x 4 pcs,or
 LR
6  (sizeAAalkalinebattery)x 4 pcs
󱾀 Currentconsumption MODEL 4200 :Approx. 50 mA(max. 100 mA)
  KEW
4202 :Approx. 90 mA(max. 140 mA)
󱾀 Measurementtime MODEL 4200 :Approx. 12 hours(whenusingR 6 P),or
24 hours(whenusingLR 6 )
  KEW
4202 :Approx. 5 hours (whenusing R 6 P),or
21 hours(whenusingLR 6 )
󱾀 Measuringrangeandaccuracy
Function Range Resolution Measuringrange Accuracy
Earth
resistance
(Auto-ranging)
20 Ω 0 . 01 Ω 0 . 00 〜 20 . 99 Ω ± 1 . 5 % ± 0 . 05 Ω
200 Ω 0 . 1 Ω
16 . 0 〜 99 . 9 Ω ± 2 % ± 0 . 5 Ω
100 . 0 〜 209 . 9 Ω ± 3 % ± 2 Ω
1500 Ω
1 Ω
160 〜 399 Ω ± 5 % ± 5 Ω
400 〜 599 Ω ± 10 % ± 10 Ω
10 Ω 600 〜 1580 Ω ※ 
ACcurrent(AC)
(
50 / 60 Hz)
(Auto-ranging)
100 mA 0 . 1 mA 0 . 0 〜 104 . 9 mA
± 2 % ± 0 . 7 mA
(sinewave)
1000 mA 1 mA 80 〜 1049 mA
± 2 %
(sinewave)
10 A 0 . 01 A 0 . 80 〜 10 . 49 A
30 A 0 . 1 A 8 . 0 〜 31 . 5 A
*Crestfactor ≦ 2 . 5 Accuracyatsinewave+ 1 %( 50 Hz/ 60 Hz,peakvalueshallnotexceed 60 A)
*Inthefollowingcases,zerowillbedisplayedontheLCD.
-At 20 Ω rangeofEarthresistancefunction: 0 . 04 Ω orless
-At 100 mArangeofACAfunction: 0 . 4 mAorless
*Arangeshiftstoupperrangewhentheinputexceeds 105 %oftheselectedrange,andshifts
tothelowerrangewhentheinputfallsunder 80 %oftherange.
  5  
󱾀 Autopower-off Turns power off about 10 minutesafterthelast
buttonoperation.
󱾀 Applicablestandards IEC 61010 - 1 ,IEC 61010 - 2 - 030 (CAT.IV 300 VPollutiondegree 2 )
 IEC 61010 - 2 - 032
 IEC 61326 - 2 - 2 (EMCstandard)
󱾀 Environmentalstandard EN 50581 Monitoringandcontrolinstruments
󱾀 Externalcommunication BluetoothVer 2 . 1 +EDRClass 2
method
󱾀 Withstandvoltage AC 5160 Vrms/ 5 seconds
 Between the TransformerjawsfittedpartsandCase
enclosure(exceptforjaws)
󱾀 Insulationresistance 50 M Ω ormoreat 1000 V
 Between the TransformerjawsfittedpartsandCase
enclosure(exceptforjaws)
󱾀 Conductorsize Approx. 32 mmindiametermax.
󱾀 Dimension 246 (L)x 120 (W)x 54 (D)mm
󱾀 Weight Approx. 780 g(includingbatteries)
󱾀 Accessories BatteryR 6 P: 4 pcs(MODEL 4200 )
  LR 6 : 4 pcs(KEW 4202 )
 Instructionmanual  : 1 pce
 Resistorforoperationcheck: 1 pce
 (MODEL 8304 )
 HardcaseMODEL 9166  : 1 pce(MODEL 4200 )
 MODEL 9167  : 1 pce(KEW 4202 )
<Supplementalremarks>
○ Effectivevalue(RMS)
 Most alternating currents and voltages are expressed in effective values, which are also
referred to as RMS (Root-Mean-Square) values. The effective value is the square root of
the average of square of alternating current or voltage values. Many clamp meters using
a conventional rectifying circuit have "RMS" scales for AC measurement. The scales are,
however,actuallycalibratedintermsoftheeffectivevalueofasinewavethoughtheclamp
meterisrespondingtotheaveragevalue.Thecalibrationisdonewithaconversionfactorof
1 . 111 forsinewave,whichisfoundbydividingtheeffectivevaluebytheaveragevalue.
 Theseinstrumentsarethereforeinerroriftheinputvoltageorcurrenthassomeothershape
thansinewave.
○ CF(CrestFactor)isfoundbydividingthepeakvaluebytheeffectivevalue.
Examples:
Sinewave:CF= 1 . 414 Squarewavewitha 1 : 9 dutyratio:CF= 3

  6  
4. Instrument layout
󱾀  Symbols to be displayed on the LCD
1
2
63
4
5
7
8
9
11
12
10
󱾀  Name of each parts and buttons (for MODEL4200 and KEW4202)
1 Transformer jaw
2 Trigger
3 Backlight button
Switches on/off the backlight.
4 Function button
Switches ACA/ Earth resistance
functions.
5 Memory mode button
Check the measured value by
Data number.
6 Data hold button
Freezes/ releases the fixed
readings.
7 Power button
Turns on/off the instrument.
8 Display unit (LCD)
9 Cursor button (UP)
Selects data number; to save
the measured value, or to view
the measured data in memory.
10 Cursor button (DOWN)
Selects data number; to save the
measured value, or to view the
measured data in memory.
11 Save button
Saves the measured value.
12 Barrier
It is a part providing protection
against electrical shock and
ensuring the minimum required
air and creepage distances.
Displayed when saving the measured value or when
instrumentisinmemorymode.
Displayedwhenbatteriesareexhausted.
DisplayedatEarthresistancefunctionwhen
Transformerjawsarenotproperlyclosed.
DisplayedatEarthresistancefunctionwhencurrentor
noisethataffectsonthemeasuredvaluepresents.
Displayedwhendataholdfunctionisactivated.
DisplayedwhenACAfunctionisselected.
Displayed when instrument is in continuity mode at
Earthresistancefunction.
Datanumber
1 to 100
Measuredvalue Unit
  7  
5. Measurement principle
Thisinstrumentcanmeasuretheearthresistancetoearthinmulti-earthedsystem.
Let'sregardearthresistanceundertestasRx,andtheotherearthresistancesas
R
1 ,R 2 , … Rn.
Of theseearthresistances,R 1 , R 2 , … Rn canbeconsideredthattheyare
connectedinparallel.
AndcanberegardedasacombinedresistanceRs.TheRscanberegardedsmall
enoughagainstRxsinceacombinedresistanceconsistsofseveralresistances.
Followingisanequivalentcircuitdiagramofthiscircuit.
=
=

  6  
4. Instrument layout
󱾀  Symbols to be displayed on the LCD
1
2
63
4
5
7
8
9
11
12
10
󱾀  Name of each parts and buttons (for MODEL4200 and KEW4202)
1 Transformer jaw
2 Trigger
3 Backlight button
Switches on/off the backlight.
4 Function button
Switches ACA/ Earth resistance
functions.
5 Memory mode button
Check the measured value by
Data number.
6 Data hold button
Freezes/ releases the fixed
readings.
7 Power button
Turns on/off the instrument.
8 Display unit (LCD)
9 Cursor button (UP)
Selects data number; to save
the measured value, or to view
the measured data in memory.
10 Cursor button (DOWN)
Selects data number; to save the
measured value, or to view the
measured data in memory.
11 Save button
Saves the measured value.
12 Barrier
It is a part providing protection
against electrical shock and
ensuring the minimum required
air and creepage distances.
Displayed when saving the measured value or when
instrumentisinmemorymode.
Displayedwhenbatteriesareexhausted.
DisplayedatEarthresistancefunctionwhen
Transformerjawsarenotproperlyclosed.
DisplayedatEarthresistancefunctionwhencurrentor
noisethataffectsonthemeasuredvaluepresents.
Displayedwhendataholdfunctionisactivated.
DisplayedwhenACAfunctionisselected.
Displayed when instrument is in continuity mode at
Earthresistancefunction.
Datanumber
1 to 100
Measuredvalue Unit
  7  
5. Measurement principle
Thisinstrumentcanmeasuretheearthresistancetoearthinmulti-earthedsystem.
Let'sregardearthresistanceundertestasRx,andtheotherearthresistancesas
R
1 ,R 2 , … Rn.
Of theseearthresistances,R 1 , R 2 , … Rn canbeconsideredthattheyare
connectedinparallel.
AndcanberegardedasacombinedresistanceRs.TheRscanberegardedsmall
enoughagainstRxsinceacombinedresistanceconsistsofseveralresistances.
Followingisanequivalentcircuitdiagramofthiscircuit.
=
=

  8  
M-4102A
ByapplyingtheVoltage(V)tothecircuitfromtheTransformerjaw(CT 1 ),currentI
is(shallbeflowed)flowedcorrespondingtotheearthresistance.Rcanbeputout
bythecalculationafterdetectingthecurrentwiththeotherTransformerjaw(CT
2 ).
Inthiscase,RdisplayedinthisinstrumentcanberegardedasRxbecauseRscan
beregardedsmallenoughagainstRx.
#CAUTION
This instrument is not supporting the measurement for the locations with
followingearthsystems.
󱾀 Single-earththatisnotconnectedtootherearths.(Lightningrod,etc.)
󱾀 Earthonwhichacurrentover 2 AismeasuredatACcurrentfunctionofthis
instrument.
󱾀 Earthwithalargerearthresistancethananearthresistanceoftesting.
󱾀 Earthwithearthresistanceover 1500 Ω .
Precision measurement shall be performed with our Earth resistance tester:
M-
4102 AorM- 4105 Aforthemeasurementofsingle-earthedwire.
  9  
6. Getting started
( 1 )Checkthebatteryvoltage
 WhennothingisdisplayedontheLCD,pressthepowerbutton andturn
ontheinstrument.Batteryvoltageisenoughwhenindicationisclearandthe
" "symbolisnotdisplayedontheLCDafterturningontheinstrument.
 Followtheproceduredescribedin 9. Battery replacement andreplacethe
batterieswithnewoneswhenanyoffollowingsymptomsisnoted.Otherwise,
accuratemeasurementandpropersavingcannotbeensured.
 *" "symbolisbeingdisplayed.
 *indicationsarefaintanddifficulttoread.
 *nothingisdisplayedontheLCD.
( 2 )Verifythecorrectmeasurementofearthresistance
 Clamp-onthesuppliedresistorforoperationcheckasshownbelow,andverify
that the Transformer jaw and the circuit works correctly. When the indicated
valueis within the range describedbelow,theyareoperatingcorrectly.If the
indicatedvalueisgreatlyexceedingtheaccuracy,sendtheinstrumenttoyour
localKYORITSUdistributorforrepairorrecalibration.
 For repair, the resistor for operation check shall be attached and returned
togetherwiththeinstrument.
#CAUTION
Thisinstrumentperformsself-calibrationforabout 3 secondswhenitisturned
on. ("  " is displayed on the LCD.) Do not clamp onto any conductor or
openthejawsinthisperiod.Otherwise,inaccuratemeasurementmayoccur.
Resistorforoperationcheck
1 Ω
10 Ω
Allowablerange
0 . 93  〜  1 . 07
9
. 75  〜  10 . 25

  8  
M-4102A
ByapplyingtheVoltage(V)tothecircuitfromtheTransformerjaw(CT 1 ),currentI
is(shallbeflowed)flowedcorrespondingtotheearthresistance.Rcanbeputout
bythecalculationafterdetectingthecurrentwiththeotherTransformerjaw(CT
2 ).
Inthiscase,RdisplayedinthisinstrumentcanberegardedasRxbecauseRscan
beregardedsmallenoughagainstRx.
#CAUTION
This instrument is not supporting the measurement for the locations with
followingearthsystems.
󱾀 Single-earththatisnotconnectedtootherearths.(Lightningrod,etc.)
󱾀 Earthonwhichacurrentover 2 AismeasuredatACcurrentfunctionofthis
instrument.
󱾀 Earthwithalargerearthresistancethananearthresistanceoftesting.
󱾀 Earthwithearthresistanceover 1500 Ω .
Precision measurement shall be performed with our Earth resistance tester:
M-
4102 AorM- 4105 Aforthemeasurementofsingle-earthedwire.
  9  
6. Getting started
( 1 )Checkthebatteryvoltage
 WhennothingisdisplayedontheLCD,pressthepowerbutton andturn
ontheinstrument.Batteryvoltageisenoughwhenindicationisclearandthe
" "symbolisnotdisplayedontheLCDafterturningontheinstrument.
 Followtheproceduredescribedin 9. Battery replacement andreplacethe
batterieswithnewoneswhenanyoffollowingsymptomsisnoted.Otherwise,
accuratemeasurementandpropersavingcannotbeensured.
 *" "symbolisbeingdisplayed.
 *indicationsarefaintanddifficulttoread.
 *nothingisdisplayedontheLCD.
( 2 )Verifythecorrectmeasurementofearthresistance
 Clamp-onthesuppliedresistorforoperationcheckasshownbelow,andverify
that the Transformer jaw and the circuit works correctly. When the indicated
valueis within the range describedbelow,theyareoperatingcorrectly.If the
indicatedvalueisgreatlyexceedingtheaccuracy,sendtheinstrumenttoyour
localKYORITSUdistributorforrepairorrecalibration.
 For repair, the resistor for operation check shall be attached and returned
togetherwiththeinstrument.
#CAUTION
Thisinstrumentperformsself-calibrationforabout 3 secondswhenitisturned
on. ("  " is displayed on the LCD.) Do not clamp onto any conductor or
openthejawsinthisperiod.Otherwise,inaccuratemeasurementmayoccur.
Resistorforoperationcheck
1 Ω
10 Ω
Allowablerange
0 . 93  〜  1 . 07
9
. 75  〜  10 . 25

  10  
7. Measuring method
#DANGER
󱾀
Never make measurement on a circuit in which the electrical potential
exceedsAC
300 V.
󱾀 Transformer jaws are made of metal and their tips are not completely
insulated. Be especially careful about the possible shorting where the
equipmentundertesthasexposedmetalparts.
󱾀 NevermakemeasurementwiththeBatterycoverremoved.
󱾀 Do not measure a current over 30 A. Transformer jaws may heat to cause
afireordeformationofmoldingparts,whichwilldegradeinsulation.When
clampingtheconductorsonwhichover
30 Aflowingand" "isdisplayed
on the LCD, stop measurement immediately and take off the instrument
fromtheconductorundertest.
#CAUTION
󱾀
Takesufficientcarenottoapplyshock,vibrationorexcessiveforcetothe
jawtips.
Otherwise,preciselyadjustedTransformerjawswillbedamaged.
󱾀 This instrumentperformsself-calibrationforabout 3 secondswhen
it is turned on. ("" is displayed on the LCD.) Do not clamp onto
anyconductororopenthejawsinthisperiod.Otherwise,inaccurate
measurementmayoccur.
󱾀 Whenforeignsubstancesarestuckinthejawtipsortheyarenotproperly
engaged, the Transformer jaws do not fully close. In such a case, do not
releasethejawtriggerabruptlyorattempttoclosetheTransformerjawsby
applyingexternalforce.Makesurethatthejawsclosebythemselvesafter
removingtheforeignsubstanceormakingthemfreetomove.
󱾀 The size of a conductor can be tested is 30 mm in diameter. Accurate
measurementcannotbemadeonaconductorlargerthanthis,becausethe
Transformerjawscannotfullyclose.
Neverattempttoapplyexcessiveforcetoclosethejaws.
󱾀 Whenmeasuringlargecurrent,theTransformerjawsmaybuzz.Thishasno
effectontheinstrument'sperformanceorsafety.
󱾀 Sensitive Transformer jaws are used for this instrument. Because of the
characteristics of Transformer jaws, which can be opened and closed,
it is impossible to eliminate the interference of external magnetic field
completely.Iftherearesomething,whichgeneratinglargemagneticfield,at
anearby site, current value canbedisplayed (
 0  may not be displayed)
before clamping ontheconductor.Forsuchacase,pleaseuse the
instrumentatalocationfarfromthething,whichgeneratingmagneticfield.

Followingarethetypicalthingsgeneratingmagneticfield.
*Conductorfedlargecurrent
*Motor
*Equipmentwhichhasmagnet
*Integratingwattmeter
  11  
7-1 Normal measurement of current
*PresstheFunctionbutton andselecttheACAfunction.
*Confirmthedisplayedunitis" mA ",andthe" MEM "isnotdisplayedatthe
upperleftontheLCD.
*Press the trigger to open the Transformer jaws, and close them over one
conductoronly.
*MeasuredcurrentvalueisdisplayedontheLCD.
(Earthleakagecurrentthatflowsthroughanearthedwirecanbemeasuredby
thismethod.)
7-2 Measurement of balance leakage current
*PresstheFunctionbutton andselecttheACAfunction.
*Confirmthedisplayedunitis" mA ",andthe" MEM "isnotdisplayedatthe
upperleftontheLCD.
*Clampontoallconductorsexceptfortheearthedwire.
*MeasuredcurrentvalueisdisplayedontheLCD.
Load Load
Single-phase 2 -wiresystem
In 3 -wiresystemwithneutral,
clampontoall
3 wires.
Three-phase 3 -wiresystem
In 4 -wiresystemwithneutral,
clampontoall
4 wires.

  10  
7. Measuring method
#DANGER
󱾀
Never make measurement on a circuit in which the electrical potential
exceedsAC
300 V.
󱾀 Transformer jaws are made of metal and their tips are not completely
insulated. Be especially careful about the possible shorting where the
equipmentundertesthasexposedmetalparts.
󱾀 NevermakemeasurementwiththeBatterycoverremoved.
󱾀 Do not measure a current over 30 A. Transformer jaws may heat to cause
afireordeformationofmoldingparts,whichwilldegradeinsulation.When
clampingtheconductorsonwhichover
30 Aflowingand" "isdisplayed
on the LCD, stop measurement immediately and take off the instrument
fromtheconductorundertest.
#CAUTION
󱾀
Takesufficientcarenottoapplyshock,vibrationorexcessiveforcetothe
jawtips.
Otherwise,preciselyadjustedTransformerjawswillbedamaged.
󱾀 This instrumentperformsself-calibrationforabout 3 secondswhen
it is turned on. ("" is displayed on the LCD.) Do not clamp onto
anyconductororopenthejawsinthisperiod.Otherwise,inaccurate
measurementmayoccur.
󱾀 Whenforeignsubstancesarestuckinthejawtipsortheyarenotproperly
engaged, the Transformer jaws do not fully close. In such a case, do not
releasethejawtriggerabruptlyorattempttoclosetheTransformerjawsby
applyingexternalforce.Makesurethatthejawsclosebythemselvesafter
removingtheforeignsubstanceormakingthemfreetomove.
󱾀 The size of a conductor can be tested is 30 mm in diameter. Accurate
measurementcannotbemadeonaconductorlargerthanthis,becausethe
Transformerjawscannotfullyclose.
Neverattempttoapplyexcessiveforcetoclosethejaws.
󱾀 Whenmeasuringlargecurrent,theTransformerjawsmaybuzz.Thishasno
effectontheinstrument'sperformanceorsafety.
󱾀 Sensitive Transformer jaws are used for this instrument. Because of the
characteristics of Transformer jaws, which can be opened and closed,
it is impossible to eliminate the interference of external magnetic field
completely.Iftherearesomething,whichgeneratinglargemagneticfield,at
anearby site, current value canbedisplayed (
 0  may not be displayed)
before clamping ontheconductor.Forsuchacase,pleaseuse the
instrumentatalocationfarfromthething,whichgeneratingmagneticfield.

Followingarethetypicalthingsgeneratingmagneticfield.
*Conductorfedlargecurrent
*Motor
*Equipmentwhichhasmagnet
*Integratingwattmeter
  11  
7-1 Normal measurement of current
*PresstheFunctionbutton andselecttheACAfunction.
*Confirmthedisplayedunitis" mA ",andthe" MEM "isnotdisplayedatthe
upperleftontheLCD.
*Press the trigger to open the Transformer jaws, and close them over one
conductoronly.
*MeasuredcurrentvalueisdisplayedontheLCD.
(Earthleakagecurrentthatflowsthroughanearthedwirecanbemeasuredby
thismethod.)
7-2 Measurement of balance leakage current
*PresstheFunctionbutton andselecttheACAfunction.
*Confirmthedisplayedunitis" mA ",andthe" MEM "isnotdisplayedatthe
upperleftontheLCD.
*Clampontoallconductorsexceptfortheearthedwire.
*MeasuredcurrentvalueisdisplayedontheLCD.
Load Load
Single-phase 2 -wiresystem
In 3 -wiresystemwithneutral,
clampontoall
3 wires.
Three-phase 3 -wiresystem
In 4 -wiresystemwithneutral,
clampontoall
4 wires.

  12  
#CAUTION
󱾀
Followtheproceduredescribedin "7-1 Normal measurement of
current"
andmeasure the current flowing on the earthed wire prior to the
measurementofearthresistance.
In case that the "  " symbol is displayed at the upper right of the
LCD,itmeansthatagreaterrorwouldbeincludedinthemeasuredresult.
Toavoidsuchinaccurate measurement, reduce thecurrentflowingonthe
earthedwirebyturningoff thedevicefromwhichcurrentisappliedtothe
earthedlineundertest.
󱾀  Measurement cannot be made for the earth without multi-earthing system or
whentheearthresistanceundertestissmallerthantheotherearthresistances.
󱾀 Toavoidinaccuratereadingmaybetaken,nevermakeameasurementfor
thesameearthsystemwithmultipleunitsofthisinstruments.
󱾀
The" "symbolmaybedisplayedduringameasurementofearth
resistance. It indicates that the jaws of the instrument are not properly
closed.Measurementisbeingstoppedwhilethissymbolisdisplayedonthe
LCD.ClosetheTransformerjawsproperlytore-startthemeasurement.
󱾀 Response time at Earth resistance function is about 7  seconds. It takes
awhileuntilthereadingsbecomestable.
7-3 Measurement of earth resistance
󱾀
Measurementprocedure
*PresstheFunctionbutton andselecttheEarthresistancefunction.
*Confirmthedisplayedunitis" Ω ",and" MEM "isnotdisplayedattheupper
leftontheLCD.
*Press the trigger to open the Transformer jaws, and close them over the
earthedwireundertest.
*MeasuredresistancevalueisdisplayedontheLCD.
<Noisecheckfunction>
AttheEarthresistancefunction,the" "symbolisdisplayedontheLCDin
thefollowingcaseswhichmayeffectonameasurement.
*Thecurrentflowingontheearthedwireisexceedingthefollowingvalue.
RangeofEarthresistancefunction Allowablecurrentvalue
20 Ω 2 Aorless
200 Ω / 1500 Ω 400 mAorless
*The current flowing on the earthed wire includes a harmonic wave which
effectsonthemeasurement.
<Jawscheckfunction>
The" "symbolisdisplayedwhentheTransformerjawsoftheinstrumentare
notproperlyclosed.
MeasurementwillbestoppedwhenthissymbolappearsontheLCD.
  13  
8. Other functions
8-1 Auto power-off function
Thisfunctionistopreventtheinstrumentfrombeingleftturnedonandconserve
batterypower.Theinstrumentautomaticallyturnsoffabout
10 minutesafterthe
lastbuttonoperation.
Toreturntothenormalmode,pressthePowerbutton againandturnson
theinstrument.
◇ Thebuzzersoundsbeforetheinstrumentturnsoff.
◇ Todisabletheautopower-offfunction,followtheprocedurebelow.
( 1 )Turn on the instrument by pressing the Power button with the Data hold
button presseddown.ThenreleasethePowerbuttononly.
( 2 )The instrument is turned on, and "  " is displayed on the LCD for
about 1 second.
Now,theautopower-offfunctionisdisabled.
To enablethe autopower-offfunctionagain,turnoff and on the instrument
withoutpressingtheDataholdbutton.
8-2 Data hold function
Thisfunctionistofreezetheindicatedvalueonthedisplay.WhentheDatahold
button ispressedonce, the indicated value ontheLCDisfixed and does
notchangeeventhoughcurrentundertestvaries.
The" "symbolisshownattheupperrightontheLCD.ToexittheDatahold
mode,presstheDataholdbuttonagain.(" "symboldisappears.)
◇ WhentheAutopower-offfunctionworkswhiletheinstrumentisintheData
holdmode,dataholdiscancelled.
8-3 Buzzer function
This function is to give audible warning to user when the measured earth
resistance is
10 Ω  or less. To enable this function, press the Function button
attheearthresistancefunctionatleast 2 seconds.(The" "symbolis
displayedatthelowerleftontheLCD.)
Buzzersoundswhenthemeasuredearthresistanceis 10 Ω orless.
Todisablethebuzzerfunction,presstheFunctionbuttonagain.
(Then,the" "symboldisappears.)
8-4 Backlight function
Thisfunctionistoviewthetestresultsindimlylitareas.
Toswitchonthebacklight,presstheBacklightbutton whiletheinstrument
turnedon.
Toswitchoffthebacklight,presstheBacklightbuttonagain.
◇ Backlightisautomaticallyswitchedoffinabout 1 minutetoconservebattery
power.

  12  
#CAUTION
󱾀
Followtheproceduredescribedin "7-1 Normal measurement of
current"
andmeasure the current flowing on the earthed wire prior to the
measurementofearthresistance.
In case that the "  " symbol is displayed at the upper right of the
LCD,itmeansthatagreaterrorwouldbeincludedinthemeasuredresult.
Toavoidsuchinaccurate measurement, reduce thecurrentflowingonthe
earthedwirebyturningoff thedevicefromwhichcurrentisappliedtothe
earthedlineundertest.
󱾀  Measurement cannot be made for the earth without multi-earthing system or
whentheearthresistanceundertestissmallerthantheotherearthresistances.
󱾀 Toavoidinaccuratereadingmaybetaken,nevermakeameasurementfor
thesameearthsystemwithmultipleunitsofthisinstruments.
󱾀
The" "symbolmaybedisplayedduringameasurementofearth
resistance. It indicates that the jaws of the instrument are not properly
closed.Measurementisbeingstoppedwhilethissymbolisdisplayedonthe
LCD.ClosetheTransformerjawsproperlytore-startthemeasurement.
󱾀 Response time at Earth resistance function is about 7  seconds. It takes
awhileuntilthereadingsbecomestable.
7-3 Measurement of earth resistance
󱾀
Measurementprocedure
*PresstheFunctionbutton andselecttheEarthresistancefunction.
*Confirmthedisplayedunitis" Ω ",and" MEM "isnotdisplayedattheupper
leftontheLCD.
*Press the trigger to open the Transformer jaws, and close them over the
earthedwireundertest.
*MeasuredresistancevalueisdisplayedontheLCD.
<Noisecheckfunction>
AttheEarthresistancefunction,the" "symbolisdisplayedontheLCDin
thefollowingcaseswhichmayeffectonameasurement.
*Thecurrentflowingontheearthedwireisexceedingthefollowingvalue.
RangeofEarthresistancefunction Allowablecurrentvalue
20 Ω 2 Aorless
200 Ω / 1500 Ω 400 mAorless
*The current flowing on the earthed wire includes a harmonic wave which
effectsonthemeasurement.
<Jawscheckfunction>
The" "symbolisdisplayedwhentheTransformerjawsoftheinstrumentare
notproperlyclosed.
MeasurementwillbestoppedwhenthissymbolappearsontheLCD.
  13  
8. Other functions
8-1 Auto power-off function
Thisfunctionistopreventtheinstrumentfrombeingleftturnedonandconserve
batterypower.Theinstrumentautomaticallyturnsoffabout
10 minutesafterthe
lastbuttonoperation.
Toreturntothenormalmode,pressthePowerbutton againandturnson
theinstrument.
◇ Thebuzzersoundsbeforetheinstrumentturnsoff.
◇ Todisabletheautopower-offfunction,followtheprocedurebelow.
( 1 )Turn on the instrument by pressing the Power button with the Data hold
button presseddown.ThenreleasethePowerbuttononly.
( 2 )The instrument is turned on, and "  " is displayed on the LCD for
about 1 second.
Now,theautopower-offfunctionisdisabled.
To enablethe autopower-offfunctionagain,turnoff and on the instrument
withoutpressingtheDataholdbutton.
8-2 Data hold function
Thisfunctionistofreezetheindicatedvalueonthedisplay.WhentheDatahold
button ispressedonce, the indicated value ontheLCDisfixed and does
notchangeeventhoughcurrentundertestvaries.
The" "symbolisshownattheupperrightontheLCD.ToexittheDatahold
mode,presstheDataholdbuttonagain.(" "symboldisappears.)
◇ WhentheAutopower-offfunctionworkswhiletheinstrumentisintheData
holdmode,dataholdiscancelled.
8-3 Buzzer function
This function is to give audible warning to user when the measured earth
resistance is
10 Ω  or less. To enable this function, press the Function button
attheearthresistancefunctionatleast 2 seconds.(The" "symbolis
displayedatthelowerleftontheLCD.)
Buzzersoundswhenthemeasuredearthresistanceis 10 Ω orless.
Todisablethebuzzerfunction,presstheFunctionbuttonagain.
(Then,the" "symboldisappears.)
8-4 Backlight function
Thisfunctionistoviewthetestresultsindimlylitareas.
Toswitchonthebacklight,presstheBacklightbutton whiletheinstrument
turnedon.
Toswitchoffthebacklight,presstheBacklightbuttonagain.
◇ Backlightisautomaticallyswitchedoffinabout 1 minutetoconservebattery
power.

  14  
8-5 Memory function
Thisfunctionistosaveanddisplaythemeasurementresults.
󱾀  Saving the measurement results
( 1 )Select any data number (from 1  to 100 ) by using the Cursor button 
or  at ACA or Earth resistance function, and save the measurement
results.
◇ When the Cursor button is being pressed down, the number switches
quickly.
( 2 )To save the measurement result being displayed on the LCD, press the
Savebutton .Thentheresultissavedtotheselecteddatanumber.
(" MEM "isdisplayedforabout 1 second.)
◇ After saving the data, data number automatically switches to the next
availabledatanumber(presentdatanumber+ 1 )andthenextmeasured
valuecanbesavedtoit.
(Thedatanumberreturnsto 1 afterthemeasurementresultissavedto
thedatanumber 100 .)
◇ When the new measurement result is saved to the data number on
which the previous measurement result is saved, previous data will be
overwritten.
◇ Whensavingadatawhilethe dataholdfunctionisactivated,the
readingswhichisbeingheldontheLCDwillbesaved.
󱾀  Recalling the measurement results in memory
Toactivatethememoryfunction,presstheMemorymodebutton .
Then" MEM "isdisplayedontheLCD.
Pressing the Cursor button  or  changesthedatanumberdisplayed
ontheLCD,andthemeasurementresultinmemoryisdisplayedaccordingly.
◇ To disable the memory mode, press the Memory mode button again or
presstheFunctionbutton .(Then" MEM "symboldisappears.)
◇ Bars" "aredisplayedfortheDatanumberthatdoesnotcontain
anytestresult.
󱾀  Clearing the measurement results in memory
Toclearthemeasurementresult,presstheSavebutton withtheMemory
mode button  pressed down. The message "  " is displayed on the
LCDforabout 2 secondsandthemeasurementresultontheselecteddata
numberiscleared.
(ThentheindicationontheLCDbecomes" ".)
◇ Followtheprocedurebelowtodeletetheallmeasurementresults.
( 1 )Press thePowerbutton ,while the instrument is off,whilethe
Memorymode button and the Savebutton are being pressed down.
ThenreleasethePowerbuttononly.
( 2 )Instrumentisturnedon;" MEM "," "and" "aredisplayed
ontheLCDforabout 2 sec..
Nowallthestoreddataaredeleted.
  15  
8-6 Bluetooth Communication Function (KEW4202 only)
KEW 4202 canperform data communicationbetweenAndroiddevicesvia
Bluetoothcommunication.
NotesonusingBluetoothfunction:
ThisfunctionisnotavailableonMODEL 4200 butavailableonKEW 4202 .
Before starting to use this function, download the special application  KEW
Smart
 fromtheInternetsite.
 Some of the functions are available only while connected to the Internet. For
furtherdetails,pleasereferto
11. KEW Smart Functions or Help for  KEW
Smart
 .

#WARNING
RadiowavesatBluetoothcommunicationmayaffecttheoperationsofmedical
electronicdevices.
Special care should be taken when using Bluetooth connection in the areas
wheresuchdevicesarepresent.
Cautions:
󱾀 The maximum Bluetooth communication distance is approx. 10 m. However,
itmaybe shortened if thereareobstacles,such as walls, doorsorpeople, or
dependingontheradiowaveconditionorenvironmentofusage.
󱾀 Using KEW 4202  or Android devices near wireless LAN devices (IEEE 802 . 11 .
b/g) may cause the radio interference, lowering of communication speed,
resulting in significant time lag in the display update rate between KEW
4202 
andAndroiddevice.Inthiscase,keepKEW
4202 andtheAndroiddeviceaway
fromthewirelessLANdevicesorturnoffthewirelessLANdevices,orshorten
thedistancebetweenKEW
4202 andAndroiddevice.
󱾀 It may be difficult to establish communication connection if either KEW 4202 
orAndroid device is in ametal box. Insuch cases, change the measurement
locationorremovethemetalobstaclebetweenKEW
4202 andAndroiddevice.
󱾀 If any leaking of data or information occurs while making a communication
usingBluetoothfunction,weassumenoresponsibilityforanyreleasedcontent.
󱾀 Communication with KEW 4202  may not be established even if using Android
device on which our special application operates. In that case, use the other
Androiddevicesandcheckforconnection.
If you cannot confirmthe connection, there maybe a problem withKEW 4202 
unit.PleasecontactyourlocalKYORITSUdistributor.
*The Bluetooth word markand logosare owned by Bluetooth SIG,Inc. andany
useofsuchmarksbyKyoritsuislicensed.
*Android and Google Map are the trademark or registered trade mark of Google
Inc..
*Inthismanual,the
 TM  or   ®   markisnotspecified.

  14  
8-5 Memory function
Thisfunctionistosaveanddisplaythemeasurementresults.
󱾀  Saving the measurement results
( 1 )Select any data number (from 1  to 100 ) by using the Cursor button 
or  at ACA or Earth resistance function, and save the measurement
results.
◇ When the Cursor button is being pressed down, the number switches
quickly.
( 2 )To save the measurement result being displayed on the LCD, press the
Savebutton .Thentheresultissavedtotheselecteddatanumber.
(" MEM "isdisplayedforabout 1 second.)
◇ After saving the data, data number automatically switches to the next
availabledatanumber(presentdatanumber+ 1 )andthenextmeasured
valuecanbesavedtoit.
(Thedatanumberreturnsto 1 afterthemeasurementresultissavedto
thedatanumber 100 .)
◇ When the new measurement result is saved to the data number on
which the previous measurement result is saved, previous data will be
overwritten.
◇ Whensavingadatawhilethe dataholdfunctionisactivated,the
readingswhichisbeingheldontheLCDwillbesaved.
󱾀  Recalling the measurement results in memory
Toactivatethememoryfunction,presstheMemorymodebutton .
Then" MEM "isdisplayedontheLCD.
Pressing the Cursor button  or  changesthedatanumberdisplayed
ontheLCD,andthemeasurementresultinmemoryisdisplayedaccordingly.
◇ To disable the memory mode, press the Memory mode button again or
presstheFunctionbutton .(Then" MEM "symboldisappears.)
◇ Bars" "aredisplayedfortheDatanumberthatdoesnotcontain
anytestresult.
󱾀  Clearing the measurement results in memory
Toclearthemeasurementresult,presstheSavebutton withtheMemory
mode button  pressed down. The message "  " is displayed on the
LCDforabout 2 secondsandthemeasurementresultontheselecteddata
numberiscleared.
(ThentheindicationontheLCDbecomes" ".)
◇ Followtheprocedurebelowtodeletetheallmeasurementresults.
( 1 )Press thePowerbutton ,while the instrument is off,whilethe
Memorymode button and the Savebutton are being pressed down.
ThenreleasethePowerbuttononly.
( 2 )Instrumentisturnedon;" MEM "," "and" "aredisplayed
ontheLCDforabout 2 sec..
Nowallthestoreddataaredeleted.
  15  
8-6 Bluetooth Communication Function (KEW4202 only)
KEW 4202 canperform data communicationbetweenAndroiddevicesvia
Bluetoothcommunication.
NotesonusingBluetoothfunction:
ThisfunctionisnotavailableonMODEL 4200 butavailableonKEW 4202 .
Before starting to use this function, download the special application  KEW
Smart
 fromtheInternetsite.
 Some of the functions are available only while connected to the Internet. For
furtherdetails,pleasereferto
11. KEW Smart Functions or Help for  KEW
Smart
 .

#WARNING
RadiowavesatBluetoothcommunicationmayaffecttheoperationsofmedical
electronicdevices.
Special care should be taken when using Bluetooth connection in the areas
wheresuchdevicesarepresent.
Cautions:
󱾀 The maximum Bluetooth communication distance is approx. 10 m. However,
itmaybe shortened if thereareobstacles,such as walls, doorsorpeople, or
dependingontheradiowaveconditionorenvironmentofusage.
󱾀 Using KEW 4202  or Android devices near wireless LAN devices (IEEE 802 . 11 .
b/g) may cause the radio interference, lowering of communication speed,
resulting in significant time lag in the display update rate between KEW
4202 
andAndroiddevice.Inthiscase,keepKEW
4202 andtheAndroiddeviceaway
fromthewirelessLANdevicesorturnoffthewirelessLANdevices,orshorten
thedistancebetweenKEW
4202 andAndroiddevice.
󱾀 It may be difficult to establish communication connection if either KEW 4202 
orAndroid device is in ametal box. Insuch cases, change the measurement
locationorremovethemetalobstaclebetweenKEW
4202 andAndroiddevice.
󱾀 If any leaking of data or information occurs while making a communication
usingBluetoothfunction,weassumenoresponsibilityforanyreleasedcontent.
󱾀 Communication with KEW 4202  may not be established even if using Android
device on which our special application operates. In that case, use the other
Androiddevicesandcheckforconnection.
If you cannot confirmthe connection, there maybe a problem withKEW 4202 
unit.PleasecontactyourlocalKYORITSUdistributor.
*The Bluetooth word markand logosare owned by Bluetooth SIG,Inc. andany
useofsuchmarksbyKyoritsuislicensed.
*Android and Google Map are the trademark or registered trade mark of Google
Inc..
*Inthismanual,the
 TM  or   ®   markisnotspecified.

  16  
Set-up:
First, set a Bluetooth connection (pairing) from an Android device. For further
details,pleaserefertotheinstructionmanualfortheAndroiddevice,
Help for
 KEWSmart  or 10. Pairing with Bluetooth compatible devices .
Communication with Android devices:
Measurement results of KEW 4202  can be displayed on Android devices via
Bluetooth communication by using the special application
 KEW Smart  .
RemotecheckingofmeasurementsispossiblewithoutaccessingKEW
4202 .
( 1 )Communicationmethod
PoweronKEW 4202 ,selectameasurementfunction,andthenclamponto
theobjecttobemeasured.
Activate  KEW Smart   on the Android device and select the device to
connect from the menu. Touch the
 Start measurement   button on the
screen after the connection has been established. Then the measured
resultswillautomaticallybedisplayedontheAndroiddevice.
( 2 )DisconnectionandStopmeasurement
Touch the  Disconnect  buttonon the screentodisconnectthe
communication.Touchthe
 Connect  buttontoreconnect.
Touchthe  Stopmeasurement  buttononthescreentostopmeasurement.
Inthiscase,connectionwithKEW
4202 willnotbedisconnected.
For various usefulfunctionsof  KEWSmart  ,please refer to 11. KEW Smart
Functions
or Help for  KEWSmart  .
  17  
9. Battery replacement
#WARNING
󱾀
In order to avoid possible shock hazard, take off the instrument from the
conductorundertestandturnofftheinstrumentbeforetryingtoreplacethe
batteries.
#CAUTION
󱾀
Donotmixnewandoldbatteries.Neverusethedifferentkindsofbatteries
atthesametime.
󱾀 Installbatteriesincorrectpolarityasmarkedinside.
When thebatteryvoltage warning symbol " "is displayed on theupper
leftoftheLCD,replacethebatteries.Notethatthedisplayblanksand" "
symbolisnotdisplayedifthebatteriesarecompletelyexhausted.
( 1 )Stop measurement when the warning symbol appears, and um-clamp from
theobjectundertest.
( 2 )Ensurethattheinstrumentispoweredoff.
( 3 )LoosentheBatterycover-fixingscrewonthebackoftheinstrument.
ThenremovetheBatterycover.
( 4 )Installnewbatteries(LR 6 orR 6 P: 4 pcs)incorrectpolarityasmarkedinside.
( 5 )PuttheBatterycoverinplaceandtightenthescrew.

  16  
Set-up:
First, set a Bluetooth connection (pairing) from an Android device. For further
details,pleaserefertotheinstructionmanualfortheAndroiddevice,
Help for
 KEWSmart  or 10. Pairing with Bluetooth compatible devices .
Communication with Android devices:
Measurement results of KEW 4202  can be displayed on Android devices via
Bluetooth communication by using the special application
 KEW Smart  .
RemotecheckingofmeasurementsispossiblewithoutaccessingKEW
4202 .
( 1 )Communicationmethod
PoweronKEW 4202 ,selectameasurementfunction,andthenclamponto
theobjecttobemeasured.
Activate  KEW Smart   on the Android device and select the device to
connect from the menu. Touch the
 Start measurement   button on the
screen after the connection has been established. Then the measured
resultswillautomaticallybedisplayedontheAndroiddevice.
( 2 )DisconnectionandStopmeasurement
Touch the  Disconnect  buttonon the screentodisconnectthe
communication.Touchthe
 Connect  buttontoreconnect.
Touchthe  Stopmeasurement  buttononthescreentostopmeasurement.
Inthiscase,connectionwithKEW
4202 willnotbedisconnected.
For various usefulfunctionsof  KEWSmart  ,please refer to 11. KEW Smart
Functions
or Help for  KEWSmart  .
  17  
9. Battery replacement
#WARNING
󱾀
In order to avoid possible shock hazard, take off the instrument from the
conductorundertestandturnofftheinstrumentbeforetryingtoreplacethe
batteries.
#CAUTION
󱾀
Donotmixnewandoldbatteries.Neverusethedifferentkindsofbatteries
atthesametime.
󱾀 Installbatteriesincorrectpolarityasmarkedinside.
When thebatteryvoltage warning symbol " "is displayed on theupper
leftoftheLCD,replacethebatteries.Notethatthedisplayblanksand" "
symbolisnotdisplayedifthebatteriesarecompletelyexhausted.
( 1 )Stop measurement when the warning symbol appears, and um-clamp from
theobjectundertest.
( 2 )Ensurethattheinstrumentispoweredoff.
( 3 )LoosentheBatterycover-fixingscrewonthebackoftheinstrument.
ThenremovetheBatterycover.
( 4 )Installnewbatteries(LR 6 orR 6 P: 4 pcs)incorrectpolarityasmarkedinside.
( 5 )PuttheBatterycoverinplaceandtightenthescrew.

  18  
10. Pairing with Bluetooth compatible devices (KEW4202)
ItisnecessarytoperformthepairingproceduretoconnectKEW 4202 andAndroid
devicesviaBluetoothcommunication.
󱾀
If the      symbol is displayed on the LCD of KEW 4202 , replace the
batterieswithnewonesbeforeperformingthepairingprocedure.
( 1 )PoweronKEW 4202 .
( 2 )PowerontheAndroid device,andfindtheSettingmenu.Lookforthe
BluetoothsettingintheWirelessSettingmenu.
( 3 )On the Android device, choose Search for Bluetooth Devices. The model
name
 KEW 4202 -XXXXXXX   will be displayed on the screen. The  X  s
behindthemodelnameistheserialnooftheunit.
( 4 )Selectandpairthedevice.
Ifthepairingsettingfails,pleasecheckthefollowingpoints.
-DistancebetweenKEW 4202 andtheAndroiddevice
Movethemcloser,andperformthepairingprocedureagain.
-BluetoothfunctiononAndroiddevice
TurnontheBluetoothfunctionontheAndroiddeviceandtryagain.
Dependingonyournetworkconnection,itmaytakeawhiletocompletethepairing
procedure.
  19  
11. Features of KEW Smart (KEW4202)
RemotecheckingofmeasurementsispossiblewithoutaccessingKEW 4202 using
thespecialAndroidapplication
 KEWSmart  .
Theapplication
 KEWSmart  isavailableondownloadsiteforfree.(AnInternet
accessisrequired.)
Please note that communication charge is incurred separately for downloading
applications and using special features of them. For your information,
 KEW
Smart
 isprovidedon-lineonly.
FeaturesofKEWSmart:
󱾀 Remote checking of measurement is possible (earth/ground resistance and
ACcurrentvalues)
󱾀 Dataholdfunction(onAndroiddevices)
󱾀 Save/displaymeasurementresults
Measuredresultscanbesavedwithcomments.(max. 32 characters)
Save data includes measurement and GPS location while GPS feature has
beenturnedon.
󱾀 Comparatorfunction(earth/groundresistancevalue)
Informswhenthemeasuredvalueislowerorhigherthanthepresetvalue.
󱾀 Memorydownloadfunction
Downloads the saved data from KEW 4202  by pressing the Memory mode
Switch
  onKEW 4202 .Thisfunctioncanbeusedwhiletheinstrument
isnotperformingmeasurements.
FeaturesavailableusingInternetconnection:
󱾀 E-mail
Measured datacanbe sent byE-mailwhile the connection toKEW 4202 is
turnedoff.
󱾀 Checkonmap
Measured locations can be checked on the Google Map if the saved data
includesGPSlocation.
On theAndroiddevice,
 OPEN   or  NOISE  warning will bedisplayedin
conjunctionwithKEW
4202 .
Forfurtherdetails,pleasesee
Help for  KEWSmart  .
Cautions:
󱾀 BatterylevelofKEW 4202 isnotshownonAndroiddevices.Ensurethatthe
battery level ofKEW
4202 issufficient before startingtoperform
measurements using these features. Replace batteries with new ones if
necessary.
󱾀 Remote control, such as switching functions or activating data hold, of
KEW
4202 fromAndroiddevicesisnotpossible.