KYORITSU KEW 2413F User manual

DIGITAL CLAMP METER
KEW SNAP Series
KEW 2413F
KYORITSU ELECTRICAL INSTRUMENTS
WORKS，LTD.
INSTRUCTION MANUAL

Contents
１． SafetyWarnings ………………………………………………………１
２． Features ………………………………………………………………４
３． Specifications …………………………………………………………５
４． InstrumentLayout ……………………………………………………９
５． Operation
５−１ Preparation …………………………………………………… 11
５−２ ACCurrentMeasurement …………………………………… 11
５−３ HowtoUsePeakHoldFunction …………………………… 14
５−４ HowtoUseTheFrequencySelectorSwitch ……………… 16
５−５ HowtoUseDataHoldFunction …………………………… 17
５−６ AnalogueOutputHowtoUseModel 7073 OutputCord … 17
６． BatteryReplacement ………………………………………………… 19
７． Cleaning ……………………………………………………………… 20
８． BeforeSendingForRepair ………………………………………… 21

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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retainitinsafecondition.Therefore,readthroughthese
operatinginstructionsbeforestartingusingtheinstrument.
● 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instruction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
bodilyinjuryorinstrumentdamage.
#
 WARNING 
● Readthroughandunderstandinstructionscontainedinthis
manualbeforestartingusing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.

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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markednexttothissymbol.
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acircuitabove 600 VAC.
● Donotattempttomakemeasurementinthepresenceofflammable
gasses,fumes, vaporor dust.Otherwise, theuse ofthe instrument
maycausesparking,whichcanleadtoanexplosion.
●  Transformerjawtipsaredesignednottoshortthecircuitundertest.
Ifequipmentundertesthasexposedconductiveparts,however,extra
precautionshouldbetakentominimizethepossibilityofshorting.
● Neveropenthebattery compartment cover when making
measurement.
●  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.
● Nevertrytomakemeasurementifanyabnormalconditions,suchas
brokenTransformerjawsorcaseisnoted.
● The instrument is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anyabnormal
conditions are noted, such as broken case, cracked test leads
and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batteryifthesurfaceoftheinstrumentiswet.

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 CAUTION
●  Donotexposetheinstrumenttothedirectsun,extremetemperatures
ordewfall.
● Besuretosetthefunctionselectorswitchtothe  OFF  position
afteruse.Whentheinstrumentwillnotbeuseforalongperiodof
time,placeitinstorageafterremovingthebattery.
Thisistoavoiddamagetotheinstrumentbypossibleleakagefrom
thebattery.
● Useadampclothanddetergentforcleaningtheinstrument.Donot
useabrasivesorsolvents.
● Thisinstrumentisn'tdust&waterproofed.Keepawayfromdustand
water.
● Never apply voltage to the OUTPUT terminal. the terminal is not
electricallyisolatedfromtheinternalcircuitsoftheinstrument.
Measurementcategories(Over-voltagecategories)
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 :Primary 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overcurrentprotectiondevice
(distributionpanel).
O: Device which is
not directly
connected to the
mains power supply

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KEW 2413 F is a unique digital clamp meter for both very low current
and high current measurements. Itsshieldedtransformersjaws
minimizes the effect of external stray magnetic field, enabling leakage
currentmeasurements.
● Measuresfrom 0 . 1 mAto 1000 AACandprovidesfrequencyresponse
higherthan 1 kHzonallmeasuringranges.
Measurementsalsopossiblewithapproximately − 7 %accuracyat 20 
kHzon 200 mArange.
● Providesafrequency selector switch   50 / 60 HzorWIDE  toturn
on or off an incorporated low pass filter. This permitscurrent
measurementinmainsfundamentalfrequencyonlyorawiderange
offrequencies,includingthosefromsuchdevicesasinverters.
● Peak-holdfacilitywithselectableresponsetimeof 10 msor 100 ms.
● Two-wayanalogueoutputterminal
ProvidesACvoltageoutputproportionalto the current undertestfor
monitoring the waveform with an oscilloscope or measuring RMS
currentvalueswithatrue-RMS-readinginstrument.
 AlsoconventACAreadingstoDCvoltageoutputfordirectconnection 
tosuchdevicesasachartrecorder.
● Dataholdfunctiontoallowforeasyreadingsinhard-to-reach
locations.Displaycanbeobservedawayfromtheconductor.
２．Features

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Measuring Ranges and Accuracy
●AC Current
３．Specifications
※ RefertoFigure 1 forfrequencycharacteristics.
Ranges
Accuracy
TimeLimitfor
Measurements
FrequencyRangeResponse
WIDE
50 / 60 Hz
200 m Ａ 0 〜 199 . 9 m Ａ±
1 . 0 ％ rdg ± 2 dgt
（ 50 / 60 Hz ）
±
3 . 0 ％ rdg ± 2 dgt
（ 40 〜１ kHz ）
±
1 . 5 ％ rdg ± 2 dgt
Continuous
2 Ａ 0 〜 1 . 999 Ａ
20 Ａ 0 〜 19 . 99 Ａ
200 Ａ 0 〜 199 . 9 Ａ
±
1 . 5 ％ rdg ± 2 dgt
（ 50 / 60 Hz ）
±
3 . 5 ％ rdg ± 2 dgt
（ 40 〜１ kHz ）
±
2 . 0 ％ rdg ± 2 dgt
1000 Ａ
0 〜 500 Ａ
±
1 . 5 ％ rdg ± 2 dgt
（ 50 / 60 Hz ）
±
3 . 5 ％ rdg ± 2 dgt
（ 40 〜１ kHz ）
±
2 . 0 ％ rdg ± 2 dgt
501 〜 1000 Ａ
±
5 ％ rdg
（ 50 / 60 Hz ）
±
10 ％ rdg
（ 40 〜１ kHz ）
±
5 . 5 ％ rdg 10 min.

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Range MeasuringRange ACOutputVoltage Accuracy
200 mA 0 〜 200 mA
0 〜 200 mV
± 2 ％ rdg 2 A 0 〜 2 A
20 A 0 〜 20 A
200 A 0 〜 200 A ± 2 . 5 ％ rdg
1000 A
0 〜 500 A 0 〜 50 mV ± 3 ％ rdg
501 A 〜 1000 A 50 〜 100 mV ± 5 ％ rdg
Analogue Output (Output impedance: Approx. 1k Ω )
●AC Output
*Voltage proportional to the current under test isoutputwith
 WIDE  frequency characteristics regardless of the setting of the
frequencySelectororpeakholdswitch.

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●DC Output
*DC voltage is output in proportion to the display reading, which
reflects frequency selector or peak hold switch position
− 200 mV
DCfor
2000 countreading.
Ranges ACInput
Current
DCOutput
Voltage
Accuracy(FrequencyRange)
Freq.Selector
Switchat
WIDEposition
Freq.Selector
Switchat 50 / 60 Hz
Position
200 mA 0 〜 200 mA
0 〜 200 mV
± 3 ％ rdg ± 3 . 5 ％ rdg 2 A 0 〜 2 A
20 A 0 〜 20 A
200 A 0 〜 200 A ± 3 . 5 ％ rdg ± 4 . 0 ％ rdg
1000 A
0 〜 500 A 0 〜 50 mV ± 5 ％ rdg ± 5 . 5 ％ rdg
501 A 〜 1000 A 50 〜 100 mV ± 7 ％ rdg ± 7 . 5 ％ rdg
Operating System  ： DualIntegration
Display   ： Field effect 3  − 1 / 2  digit liquid crystal
displaywithmaximumcountof 1999
Range selection  ： Manual
Overrange Indication  ：   1  isdisplayedonthehighestdigit
exceptfor 1000 AACrange.
Response Time  ： Approx. 1 seconds
Sample Rate  ： Approx. 3 timespersecond
Data Hold  ： Availableonallranges
Location for use  ： Indooruse,Altitudeupto 2000 m
Temperature ＆ Humidity
for Specified Accuracy  ：  23 ℃± 10 ℃ , relative humidity up to
85 %withoutcondensation
Storage Temperature
& Humidity  ：  − 10 〜 50 ℃ , relative humidity up to
80 %withoutcondensation
Operating Temperature
& Humidity  ：  0 〜 40 ℃ ,relative humidity up to 85 %
withoutcondensation

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Power Source  ： One 6 F 22 orequivalentbattery
Low Battery Warning  ： B  symbolisshownonthedisplay.
Current Consumption  ： Approx. 5 mAmax.
Standard(Safety)  ： IEC 61010 - 1
   IEC 61010 - 2 - 032
   CAT. Ⅲ ,AC 300 V,Pollutiondegree 2
(EMC) ： IEC 61326 - 1
Environmental Standards  ： EURoHSDirectivecompliant
Overload Protection  ： 1500 AACmaxfor 1 minute
Withstand Voltage  ：  3470 V AC for 5 secondsbetween
electricalcircuitandhousingcases
Insulation Resistance  ：  10 M Ω orgreaterat 1000 V between
electricalcircuitsandhousingcasesor
metalpartsofjaws
Conductor Size  ： Approx. 68 mmdiametermax.
Dimensions/Weight  ：  250 (L) × 130 (W) × 50 (D)mm × . 570 g
（ includingbattery ）
Accessories  ： 6 F 22 battery
   Carryingcase
   Instructionmanual
Optional Accessories  ： Model 7073 two-wayoutputcord
Peak Hold  ： Response time selectable from approx.
10 msand 100 ms.
 1 / √ 2 ofthepeakcurrentisdisplayed,
which means an RMS reading will be
obtained when current  having
sinusoidalwaveforminmeasured.
   Peak hold reading varies by
approximately ± 1 % max of full scale
in the first minute at 23 ℃± 10 ℃  and
relative humidity of 75 % without
condensation.

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４．Instrument Layout
Fig. 2

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① LCD
Fieldeffectliquidcrystaldisplaywithmaximumindicationof 1999 .
Functionsymbol(mA,A)anddecimalpointautomaticallyappearas
thefunction/rangeswitchisturned.
  B  is displayed on the lower left corner for low battery warning
and  1  is displayed only at the highest digit for overrange
indication.
② DataHoldButton
Allowsfor easyreading indimly litor hard-to-reach-locations.The
displaycanbeobservedawayfromtheconductorafterpushingin
thebutton.Dataholdcanbereleasedbypushingthebuttonagain
afterthereadingistaken.
③ Two-wayAnalogueOutputTerminal
AC current picked up by transformer jaws ( 7 ) is converted and
output as AC and DC voltage output. (See Analogue Output in
section 3 ,Specifications.)InsertoutputcordModel 7073 intothis
terminal for monitoring waveform with an oscilloscope, making
RMSmeasurementsorconnectingtoarecorder.
④ SafetyHandStrap
preventstheinstrumentfromslippingoffthehandduringuse.
⑤ PowerFunction/RangeSwitch
Selectionfunctionandrange.Itisalsousedtoturnpoweronoroff.
#  CAUTION
AlwayssetthePowerFunction/RangeSwitchtotheOFFposition
afteruse.
⑥ JawTrigger
Operatestransformerjaws( 7 ).Presstoopenthejaws.
⑦ TransformerJaws
Pickupthecurrentflowingthroughtheconductor.
⑧ PeakHoldSelectorSwitch
Selects 10 msor 100 msresponsetime.Settheswitchbacktothe
OFFpositiontoreleasepeakholdormakenormalmeasurements.
⑨ FrequencySelectorSwitch
Makesfrequencyresponseselection.
⑩ Barrier
It is a part providing against electrical shock and ensuring the
minimumrequiredairandcreepagedistances.

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５．Operation
５−１ Preparation
( 1 ) ToCheckbatterysetthefunction/rangeswitch( 5 )Tothedesired
position.Ifthedisplayis clearwithout symbol  B  showing,
battery voltage is sufficient. If the displayblanksor  B  is
indicated, replace the batteryinaccordancewiththebattery
replacementproceduresasdescribedinsection 6 .
Note ：   B  also appears on the display when the battery
becomesexhaustedduringuse.Replacewithanewbattery.
( 2 ) Makecertainthatthedataholdbuttonisintheoffposition − not
presseddown.Ifameasurementismadewiththedataholdbutton
pressedin,thedisplayremainslockedirrespectiveofinput.
５−２ AC current Measurement
#
 WARNING
● Donotmakemeasurementonacircuitabove 600 VAC.
● Transformerjawtips aredesignednot to shortthecircuit under
test.Ifequipmentundertesthasexposedconductiveparts,
however, extra precaution should be takentominimizethe
possibilityofshorting.
● Do not make measurement with the battery compartment cover
removedfromtheinstrument.
● Keepyourfingersandhandsbehindthebarrierduring
measurement.

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#
 CAUTION
● Transformers jaws , especially their tips, have been precisely
adjusted to obtain maximum accuracy. Take sufficient care to
avoidshock,vibrationorexcessiveforcewhenhandingthe
instrument.
● Whenaforeignsubstanceisstickinthejawtipsortheycannot
properlyengage,thetransformerjawsdonotfullyclose.Insuch
a case, do not release the jaw trigger suddenly 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maximumsizeofconductorthatcanbemeasuredisapprox.
68 mmin diameter.An accuratemeasurement cannotbe made
on a conductor larger than this, because the transformer jaws
cannotbefullyclosed.
● Frequencyselectorswitch( 9 )isdesignedtoselectthe 50 / 60 Hz
and  WIDE  frequency ranges. For further details, refer to
section 5 - 4 foroperationofthefrequencyselectorswitch.
● The transformer jaws may buzz when measuring large current.
Thishasnoeffectontheinstrument'sperformanceorsafety.
(
1 ) Setthefunction/rangeswitchtothedesiredposition.Donotexceed
themaximumallowableinputcurrentfortheselectedrange.
( 2 ) Fornormalmeasurement,pressthejawtriggertoopenthe
transformerjawsandclampontooneconductoronly.SeeFigure
3 . Earth leakage current or small current thatflowthrougha
groundedwirecanalsobemeasuredbythismethod.(Fig. 4 )
Ifisrecommendedthattheconductorisplacedatthecenterofthe
closedtransformerjaws.
( 3 ) Tomeasureoutofbalanceleakagecurrent,clamponto all
conductors except a grounded wire. The leakage current measure
willbeindicationonthedisplay.(Fig. 4 &Fig. 5 )

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Note ： Whenmeasuringlargecurrent,observethetimelimitspecifiedin
section 3 , Specifications. Otherwise, the transformers jaws may
overheat,resultingindamagetotheinstrument.

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５−３ How to Use Peak Hold Function
10 ms or 100 ms response time can be selected for peak hold
measurement.Makeselectionaccordingtoyourapplicationneeds.
(
1 ) Withthetransformer jaws clampedontothe conductorundertest,
slide the peak hold switch from the OFF position to the desired
peakresponsetimeposition.
(
2 ) Thepeakholddisplayreads 1 / √ 2 ofthepeakcurrentvalue.
Therefore, an RMS reading will be obtained when the current
undertesthasasinusoidalwaveform.
(
3 ) SlidethepeakholdswitchbacktotheOFFpositionforareset.
Note 1 ： KEW 2413 Fusesananaloguepeakholdcircuittoensurea
quickresponsetoinputcurrent.Becauseofthenatureofthis
circuit,thepeakholdreadingmaygraduallyfallor,inarare
case,rise with time.This is likely to be apparent when the
instrument is used in a high temperature and high humidity
environment.Therefore,theinstrumentwillnotbesuitablefor
makingpeakmeasurementoveran extended periodoftime.
Incaseofsuchaneed,connectarecordertotheinstrument
viatheanalogueoutputterminal.

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Note 2 ： Ifitisnecessarytoreadthedisplayawayfromtheconductor
inapeakholdmeasurement,pressthedataholdswitch( 2 )
first and then remove the instrument from the conductor.
Otherwise, the peak hold reading may be higher than the
actual value due totheelectricalnoisecausedbythe
openingandclosingofthetransformerjaws.Pressthedata
holdswitchagainforareset.
( 4 )Differencebetween 10 msand 100 msPeakResponseTime
The peakholdcircuitinthisinstrumentchargesthe peak-hold
capacitorafterrectifyingtheinputwaveform.Thetimeforthevoltage
ofthecapacitortoreach itspeakvaluevariesaccordingtoits
capacitanceandtheoutputimpedanceofthechargingcircuit.KEW
2413 Fsetsthetimeforthevoltageofthecapacitortoreach 90 %of
its peak value to 10 ma or 100 ms by switching between two output
impedances.RefertoFigure 7 forfurtherdetails.
I
For instance, select the 10 ms response time when measuring a surge
currentthatwilloccurwhenapowersupplydeviceisswitchedon.The
100 ms responsetimeisrecommendedformeasuringthestarting
currentofa motororsimilar equipment.Astable measurementcanbe
made on the 100 ms second response time setting as the peak hold
circuitdoesnotreadilyrespondtothesurgecurrent.

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５−４ How to Use The Frequency Selector Switch
KEW 2413 F has a very goodfrequencyresponsebecauseofthe
electromagnetic property of its transformersjaws.Therefore,it
measured, AC current not only of fundamental frequency of 50 Hz or
60 Hz, but of high frequencies and harmonics superimposed on the
fundamental frequency. To eliminate these superimposed components
and measure only in the fundamental frequency, KEW 2413 F has a
Low pass filter circuit, which can be activated by activated by setting
thefrequencyselectorswitchtothe' 50 / 60 Hz'position.
The Low pass filter has a cut-off frequency of approx. 100 Hz and an
attenuationcharacteristicsofapprox. − 24 dB/octave.
Note ：  − 24 dB/octavemeansthatthemagnitudeofasignaldeclinesby
afactorof 16 whenitsinitialfrequencydoubles.
Thefrequencyselectorswitchhasthefollowingtwopositions.
● WIDE( 40 Hz − over 1 kHz):
Coversawidefrequencybandfrommainssupplytohighfrequencies
generatedbysuchequipmentasinverters.
● 50 / 60 Hz( 40 − Approx. 100 Hz):
Filters out high frequency components to restrict measurement in
mainsfrequencyband.
Note ： Selection with the frequency selector switch dose not apply to
ACoutputofthetwo-wayanalogueoutput.DCoutputofthetwo-
way analogueoutputreflects thefrequencyselectorswitch
setting.RefertoFigure. 1 forfrequencycharacteristics.

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５−５ How to Use Data Hold Function
Pushin the DataHold button tofreeze the reading.This is especially
usefulfortakingareadinginadimlylitorhard-to-reachlocations.The
display can be observed away from the conductor. Push the button
againtoreleasethereading.
５−６ Analogue Output: How to Use Model 7073 Output Cord
AC and DC output can be obtained by inserting optional Model 7073 
outputcordintothetwo-wayanalogueoutputterminal( 3 ).
ACOutput
Canbemonitoredbyconnectingadigitalmultimetertoanalogueoutput
terminalorobservedasawaveformbyconnectinganoscilloscope.
For true RMS measurements, connect a true-RMS-reading digital
multimeter.
DCOutput:
Can be monitored by connecting a digital multimeter, or a recorder,
whichenablesmanyhoursofmonitoring.SeeFigure 8 .Withthe 2413 F
inthe peak holdmode, DC voltage corresponding to 1 / √ 2 of a peak
currentvaluecanbeheldandoutput.
Refertosection 5 - 3 ,HowtoUsePeakHoldFunction.

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