KYORITSU KEW FORK User manual

Note)When current is flowing from the upside to the underside of the instrument, reading is
positive(+), on the contrary, reading to be negative(-) when current is flowing from the
undersidetotheupsideoftheinstrument.
6-1-2ACcurrentmeasurement
(1)Setthefunctionselectorswitchto"
〜 A"position.
(" 〜 "and"A"markswillbedisplayedontheLCD.)
(2)Place one measured conductor lower than the triangle mark indicated on the fork shaped
sensorandmakeameasurement.(shadedpartinthefigure)
ThenmeasuredvalueisdisplayedontheLCD.
(Whenthecenteroftheconductorisnotlowerthanthetrianglemarkindicatedonthefork
shapedsensor,erroroccurs.)
Note)For the measurement of AC current, zero adjustment, which is required for the
measurementofDCcurrent,isnotnecessary.Currentflowingdirectionhasnorelationto
theindicationpolarity.
6-2Noncontactvoltagedetection(NCV)
 This function is to check the presence of voltage without touching wires or electrodes
directly.
 AlsocancheckthepresenceofACvoltageincable,outlet,fuseandcircuitbreaker.
[Details]
 While voltage is applied to a cable or outlet, the electric field depending on the voltage is
generated. This instrument detects the generated electric field, and verifies the presence of
ACvoltage.Officially,itiscalledasaninstrumentfordetectingelectricalfield.Butitisnota
familiar term, so we call it as "Non contact voltage detection". General detectors detect
voltage by contacting polarized voltage(contacts and terminals). But this instrument is
developedtosatisfythisfunctionandforsafetypurposewithoutcontactingvoltage.
# DANGER
● To avoid getting an electrical shock, never make measurement on the circuit in which
electricalpotentialoverAC/DC300Vexists.
● Beforeameasurement,besuretochecktheinstrumentoperationwithwell-knownpower
supply.If"Err"isdisplayedontheLCD,donotmakeameasurement.
● Donotmakemeasurementwithbatterycoverremoved.
● Indication on NCV range is a reference value. Make sure to check the voltage with a
preciseequipmentinadvancewhenoperatorwilldirectlytouchorconnectwires.
● Indication of voltage may be affected by non-grounded metal tube or metal case, the
placewhereaffectedbyothervoltages,handgriporthemeasuringpositionofsensor.
● Keepyourfingersandhandsbehindthebarrierduringmeasurement.
6-2-1Measurements
(1)Setthefunctionselectorswitchto"NCV"position.
(2)
 The sensing mode (100V or 200V) in effect is displayed on the LCD for 1min, and NCV
measurementstarts.
(3)Positionthetippartofforktypedsensoragainstthemeasuredobject.
 Whenvoltageisdetected,"Hi"willbedisplayedontheLCD.
 (Error could occur depending on the direction, angle and contact surface of the instrument
againstthemeasuredobject.OnNCVrange,dataholdfunctioncannotbeused.
)
Note)   When set the function selector switch to NCV range, self-check function operates and
Indicates"Err",ifthereissomefaultorabnormalcondition.Donotmakeameasurementif
suchindicationdisplayedontheLCD.
5. Preparation
(1)Checkbatteryvoltage
SettheFunctionselectorswitchtothepositionotherthanOFFposition.
Battery Voltage is enough if indications are displayed clearly and "BATT" mark is not
displayed on the LCD. If "BATT" mark is indicated or no indication on the LCD, replace
batterieswithnewoneaccordingtobatteryreplacementproceduresshowninclause8inthis
document.
#
CAUTION
● IndicationsmaynotbeingdisplayedontheLCDdespitethefunctionselectorswitchisat
thepositionotherthanOFFposition.
Thisisbecausepower-offfunctionoperatedautomaticallyandtheinstrumentturnedoff.
Powerofffunction canbereleasedby turningthefunctionselector switchtoOFF, and
thensetittotherangeonwhichyouwouldliketomakeameasurement.
IfLCDstillblank,batteriesarecompletelyexhausted.Pleasereplacebatteries.
(2)Checkthefunctionselectorswitchissettotheappropriaterange.Andalsocheckdatahold
function is not enabled. If inappropriate range is selected, desired measurement cannot be
made.
6. Measurements
6-1CurrentMeasurement
#
 DANGER
● To avoid getting an electrical shock, never make measurement on the circuit in which
electricalpotentialoverAC/DC300Vexists.
● Donotmakemeasurementwithbatterycoverremoved.
● Keepyourfingersandhandsbehindthebarrierduringmeasurement.
#
 CAUTION
● Max.diameterofmeasuredobject(conductor)is Φ 10mm.
6-1-1DCcurrentmeasurement
(1)Setthefunctionselectorswitchto" A"position.
 (" "and"A"markswillbedisplayedontheLCD.)
(2)PressHOLD/0ADJbuttonfor2secormoretoenable0ADJfunctionandadjusttheindication
ontheLCDtobe0.
(Indicationshallbeadjustedto0.Otherwise,erroroccurs.)
(3)Place one measured conductor lower than the triangle mark indicated on the fork shaped
sensorandmakeameasurement.(shadedpartinthefigure)
ThenmeasuredvalueisdisplayedontheLCD.

(Whenthecenteroftheconductorisnotlowerthanthetrianglemarkindicatedonthefork
shapedsensor,erroroccurs.)
1. Safety Warnings
This instrument has been designed and tested according to IEC Publication 61010: Safety
RequirementsforElectronicMeasuring Apparatus. Thisinstructionmanualcontainswarnings
and safety rules which must be observed by the user to ensure safe operation of the
instrument and to retain it in safe condition. Therefore, read through these operating
instructionsbeforestartingusingtheinstrument.
# WARNING
● Readthroughandunderstandinstructionscontainedinthismanualbeforestartingtousethe
instrument.
● Saveandkeepthemanualhandy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.
Failure to follow the instructions may cause injury, instrument damage and/or damage to
equipment under test. Kyoritsu is by no means liable for any damage resulting from the
instrumentincontradictiontothiscautionarynote.
Thesymbol
#
indicatedontheinstrumentmeansthattheusermustrefertorelatedpartsinthe
manualforsafe operation oftheinstrument.Besure tocarefullyreadtheinstructions following
each
#
symbolinthis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minorinjuryorinstrument
damage.
Followingsymbolsareusedontheinstrumentandintheinstructionmanual.Attentionshouldbe
paid
 toeachsymboltoensureyoursafety.
Referto theinstructionsinthemanual.Thissymbolismarked wheretheusermustrefer to

theinstructionmanual  soasnottocausepersonalinjuryorinstrumentdamage.
Indicatesaninstrumentwithdoubleorreinforcedinsulation.
Indicates that this instrument can clamp on bare conductors when measuring
 a  voltage
correspondingtotheapplicableMeasurementcategory,whichismarke
 dnexttothissymbol.
IndicatesAC(AlternatingCurrent).
IndicatesDC(DirectCurrent).
IndicatesACandDC.
ThisinstrumentsatisfiesthemarkingrequirementdefinedintheWEEEDirective(2002/96/
EC).Thissymbolindicatesseparatecollectionforelectricalandelectronicequipment.
# DANGER
● NevermakemeasurementonthecircuitaboveAC/DC300V.
● 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.
● Neverattempttousetheinstrumentifitssurfaceoryourhandiswet.
● Donotexceedthemaximumallowableinputofanymeasurementrange.
● Donotopenthebatterycoverandtheinstrumentcasewhenmakingmeasurement.
●  Nevertrytomakemeasurementifanyabnormalconditions,suchasbroken  Transformerjaws
orcaseisnoted.
●  Theinstrumentistobeusedonlyinitsintendedapplicationsorconditions.Otherwise,  safety
functions equipped with the instrument doesn
 t work, and instrument damage  or serious
personalinjurymaybecaused.
●  KeepyourfingersandhandsbehindtheBarrierduringmeasurement.
#
WARNING
● Never attempt to make any measurement, if the instrument has any structural abnormality
noted,suchascrackedcaseorexposedmetalparts.
● Do not install substitute parts or make any modification to the instrument. Return the
instrumenttoKyoritsuoryourdistributorforrepairorre-calibration.
● Donottrytoreplacethebatteriesifthesurfaceoftheinstrumentiswet.
● Alwaysswitchofftheinstrumentbeforeopeningthebatterycompartmentcoverforbattery
replacement.
#
CAUTION
● Always make sure to check the function selector switch is set to the appropriate range
beforestartingmeasurement.
● Donotexposetheinstrumenttothedirectsun,hightemperatureandhumidityordewfall.
●  Besuretosetthefunctionselectorswitchtothe"OFF"positionafteruse.Whentheinstrument
willnotbeinuseforalongperiod,placeitinstorageafterremovingthebatteries.
● Use a cloth dipped in water or neutral detergent for cleaning the instrument. Do not use
abrasivesorsolvents
Fork Jaws
Barrier
Function Selector Switch
Data Hold / Zero Adjustment Button
Hand Strap
Display
Low Battery Warning
AC/DC
NCV Range
Data Hold Mode
Unit
Fork Jaws
Barrier
Function Selector Switch
Data Hold / Zero Adjustment Button
Hand Strap
Display
Low Battery Warning
AC/DC
NCV Range
Data Hold Mode
Unit
Place the center of the
measured conductor lower
than the triangle mark indicated
on the fork shaped sensor.
(shaded part in the figure)
 IEC61326-1(EMCstandard)
● Environmental standards  EURoHSdirectivecompliant
●Indication  LCDMax.1049units,symbols
●Over range display  "OL"symbolisdisplayedontheLCD.
 (Onlyoncurrentrange)
●Response time  Approx.2sec.
●Sampling rate  Approx.twicepersecond
●Location for use  Indooruse,Altitudeupto2000m
●Temperature &
Humidity range
(guaranteed accuracy)
 23 ℃± 5 ℃
 Relativehumidity:75%orless(nocondensation)
●Operating Temperature &
Humidity range
 0 〜 40 ℃
 Relativehumidity:85%orless(nocondensation)
●Storage Temperature &
Humidity range
 -20 〜 60 ℃
 Relativehumidity:85%orless(nocondensation)
●Power source  DC3V:R03(UM-4)x2pcs
●Current consumption  Approx.12mAorless
 Todecreasecurrentconsumption,detectingcircuitisononlyfor
0.1/0.5sec.
●Power off function  Powerofffunctionoperatesautomaticallyafteraswitchremains
for10min.
●Overload Protection  AC/DCcurrent:AC/DC120A/10sec.
 ACvoltage(NCV):AC360V/10sec.
●Withstand Voltage  AC3470VforFivesec.
 (Betweenelectricalcircuitandenclosures.)
●Insulation Resistance  10M Ω /1000V
 (Betweenelectricalcircuitandenclosures.)
●Max. diameter of
measured object
 Max.10mm
●Dimensions  161(L)x40(W)x30(D)mm
●Weight  110g(includingbatteries)
●Accessories  BatteryR03----------------------2
 Instructionmanual-------------1
 CarryingcaseM-9113 --------1
Reference
*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:4dutyratio:CF=2
3. Specification
ACcurrent 〜 A
DCcurrent A
ACvoltage 〜 V
Note)NCVrangeiscalibratedtodetectthevoltage,wherenon-groundedsinglewire,AC80Vor
more.However,detectingsensitivitymaybeaffectedby theabsenceofgroundedornon-
groundedmetaltubeormetalcase.Alsoitmaybeaffectedintheplacewhereinfluenced
byothervoltages,howyougriptheinstrumentorthemeasuringpositionofsensor.
● CF(Crest Factor)  CF=2.5orless
● Standards  IEC61010-1
  MeasurementCATIII300V,pollutiondegree2
  IEC61010-2-032
InstructionManual
6-2-2Sensingmode
● Therearetwotypesofsensingmode:100Vmodeand200Vmode.
● Abovetwomodescanbechangedoverbypressingthedataholdbutton2secormore.
(The selected sensing mode is stored even if switching off the instrument. When setting the
functionswitchto"NCV"again,measurementcanbedoneonthesamemode.)
● Factorysetting:200Vmode
(1)100Vmode
Sensitivityonthismodeissetsharp,therefore,thepresenceofACvoltagecanbechecked
onlyby placingtheinstrumentclosertothemeasuredobject,such asanoutlet,aplugand
parallelcords,asshowninfigure.
(2)200Vmode
Sensitivityonthismodeissetdull,sotheearthsideandnon-earthsideof100Vcableway
candeverified.(Wherecablesarecrowded,suchasinadistributionboard,earthsidecould
notbeverified.)
AlsocancheckthepresenceofACvoltagein200Vcableway,plug,outlet,fuseandcircuit
breaker.
7. Other functions
7-1Autopowerofffunction
 Thisfunctioncausestheinstrument toautomaticallyenter thepower-offmode about10min 
afterthelastfunctionselectorswitchoperation.
 Toreleasethepower-offfunction,turnofftheinstrumentandthenturnonagain.
7-2Dataholdfunction(OnlyonACA/DCArange)
 Thisisafunctiontohold the measured value on theLCD."H"markisshownonthe LCD
whiletheinstrumentisinthedataholdmode.Toexitthedataholdmode,pressthedatahold
buttonagain.
Note)
 The measured value being held will be released when auto power-off function operates
whiledataholdfunctionisoperating.
8. Battery replacement
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WARNING
● To avoid getting electrical shock, be sure to set the function selector switch to "OFF"
positionbeforetryingtoreplacethebatteries.
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 CAUTION
● Donotmixnewandoldbatteries.
● Makesuretoinstallbatteryincorrectpolarityasindicatedinsidethebatterycover.
When"BATT"markisshownontheupperleftcorneroftheLCD,replacethebatteries.
Notethatthebatteryiscompletelyexhausted,theLCDblankswithout"BATT"markshown.
(1)Setthefunctionselectorswitchto"OFF"position.
(2)
 Unscrewthebattery coverfixingscrewsand removethebatterycover on thebottomof the
instrument.Thenreplacenewbatteries.(R03x2pcs)
Range
ACA
Measuringrange
０〜 100A
Accuracy
± 2.0 ％ rdg ±５ dgt （ 50 ／ 60Hz ）
± 3.0 ％ rdg ±５ dgt （ 50 ／ 60Hz ）
CF(Crestfactor)
CF
≦２
２＜ CF ≦ 2.5
Range
DCA
Measuringrange
０〜± 100A
Accuracy
± 2.0 ％ rdg ±５ dgt
Range
NCV
Measuringrange
AC300Vorless
Action
Normalcondition:Lo
Atvoltagedetecting(singlewireAC80Vormore):Hi
92-1556H10-22
4. INSTRUMENT LAYOUT
DISTRIBUTOR
Kyoritsu reserves the rights to change specifications or
designsdescribedinthismanualwithoutnoticeandwithout
obligations.
AC/DCFORKCURRENTTESTER
KEW 2300R
KEW FORK
Co rre ct Wrong
2. Features
● Thisinstrument,Forkcurrenttester,canmeasureAC/DCcurrentupto100Awithoutopening
andclosingtheJaws.
● TrueRMSreadingforACcurrent
● Forkshapedsensorforeasymeasurementattightplacesandcrowdedcableareas.
● NCVfunction(NonContactVoltage)enableslivewirecheck
● Autopowerofffunction
● Dataholdfunction
● Pocketsizehandytester,adoptedover-moldingforabetterfit
● Carryingcasefurnishedasastandardaccessory.
● Designedtointernationalsafetystandards.
IEC61010-2-032measurementCATIII300VPollutiondegree2
○ MeasurementCategory

Toensuresafeoperationofmeasuringinstruments,IEC61010establishessafetystandards
for various electrical environments, categorized as O to CAT IV, and called measurement
categories. Higher-numbered categories correspond to electrical environments with greater
momentaryenergy,soameasuringinstrumentdesignedforCATIIIenvironmentscanendure
greatermomentaryenergythanonedesignedforCATII.

O :Circuitswhicharenotdirectlyconnectedtothemainspowersupply.

CATII :ElectricalcircuitsofequipmentconnectedtoanACelectricaloutletbyapower
cord.

CATIII :Primaryelectricalcircuitsoftheequipmentconnecteddirectlytothedistribution
panel,andfeedersfromthedistributionpaneltooutlets.

CATIV :Thecircuitfromtheservicedroptotheserviceentrance,andtothepowermeter
andprimaryover-currentprotectiondevice(distributionpanel).
O: Device which is
not directly
connected to the
mains power supply
Barrier:It is a part providing protection against electrical shock and ensuring the minimum
requiredairandcreepagedistances.
KYORITSU ELECTRICAL INSTRUMENTS
WORKS, LTD.
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