Kyoritsu Electrical Instruments Works, Ltd. KEW 2009R User manual

INSTRUCTION MANUAL
取扱説明書
DIGITAL CLAMP METER
デジタルAC／DCクランプメータ
KEW SNAP SERIES
KEW 2009R

Contents
１．SafetyWarnings････････････････････････････････････････ １
２．Features･･･････････････････････････････････････････････ ５
３．Specifications･･････････････････････････････････････････ ７
４．InstrumentLayout･･･････････････････････････････････････11
５．PreparationforMeasurement････････････････････････････14
５−１CheckingBatteryVoltage･･････････････････････････14
５−２CheckingSwitchSettingandOperation･････････････ 14
６．Measurement･･･････････････････････････････････････････15
６−１DCCurrentMeasurement･･････････････････････････ 15
６−２ACCurrentMeasurement･･････････････････････････ 16
６−３DCVoltageMeasurement･･････････････････････････ 17
６−４ACVoltageMeasurement･･････････････････････････ 18
６−５ResistanceMeasurement ･･････････････････････････19
６−６ContinuityCheck･･････････････････････････････････ 20
６−７FrequencyMeasurement･･･････････････････････････20
６−８PeakMeasurement････････････････････････････････21
６−９AverageMeasurement･････････････････････････････23
７．OtherFunctions････････････････････････････････････････24
７−１Auto-power-offFunction････････････････････････････24
７−２DataHoldFunction････････････････････････････････ 24
７−３LoHzFunction････････････････････････････････････ 25
７−４OUTPUTTerminal･････････････････････････････････25
８．BatteryReplacement････････････････････････････････････28
９．OptionalAccessories ･･･････････････････････････････････ 29


1

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.
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.
●Be sure to use the instrument only in its intended applications
andtofollowmeasurementproceduresdescribedinthemanual.
●Besuretounderstandandfollowallsafetyinstructionscontained
inthemanual.
Failure tofollowtheabove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.


2

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.
IndicatesAC(AlternatingCurrent).
IndicatesDC(DirectCurrent).
IndicatesACandDC.
This instrument satisfies the marking requirement defined in
theWEEEDirective.Thissymbolindicatesseparatecollection
forelectricalandelectronicequipment.
DANGER
●
Nevermakemeasurementonacircuitabove750VAC/1000VDC.
●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.
●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openthebatterycompartmentcover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 barier and protective
fingerguardduringmeasurement.

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3

WARNING
●Never attempt to make any measurement, if the instrument has
any structural abnormality such as cracked case and exposed
metalpart.
●Do not turn the function selector switch with plugged in test
leadsconnectedtothecircuitundertest.
●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.
●Alwaysswitchofftheinstrumentbefore openingthebattery
compartmentcoverforbatteryreplacement.
●Stop using the test lead if the outerjacket is damaged and the
innermetalorcolorjacketisexposed.
CAUTION
●Makesurethatthefunctionselectorswitchissettoan
appropriatepositionbeforemakingmeasurement.
●Alwaysmakesuretoinserteachplugofthetestleadsfullyinto
theappropriateterminalontheinstrument.
●Make sure to remove the test leads from the instrument before
makingcurrentmeasurement.
●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inuseforalongperiod
oftime,placeitinstorageafterremovingthebattery.
●Useadampclothanddetergentforcleaning theinstrument.Do
notuseabrasivesorsolvents.

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4
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○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 :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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5
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２．Features
●Tear-drop-shapedjawsforeaseofuseincrowdedcableareasand
othertightplaces.
●Accuratetrue-RMSreadingofACcurrentorvoltagewithdistorted
waveform.
●Averagefunctionforeasyreadingofinputwithlargevariation.
●Auto-nullfunctionforeasyzeroadjustment.
●ProvidesfrequencyreadinginACcurrentorvoltagemeasurement.
●Auto-rangingfeatureoncurrent,voltageandresistanceranges.
●Widemeasuringrangefrom0upto2000A.
●Terminalcovertoavoidtheuseofanincorrectterminal.
●PEAKfunctionformeasuringapeakofinput
●Providesrecorderoutputforlonghourmonitoring
●Data Hold function for easy reading in dimly light or hard-to-read
locations
●Auto-power-offfeaturetoextendbatterylife.
●Permitseasycontinuitycheckwithabeeper
●Providesadynamicrangeof4200countsfullscale
●Widefrequencyrangefrom20Hzto1kHz
●Usesshroudedtransformerjawstofurtherimprovesafety
●Designed to CAT Ⅳ 600VAC,DC / CAT Ⅲ750VAC,1000VDC
pollutiondegree2specifiedbytheinternationalsafety
standard:IEC61010-1.

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6
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*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:
DC:CF=1
Sinewave:CF=1.414
Squarewavewitha1:10dutyratio:CF=3
Waveform
Crest factor
CF
Average value
Vavg
Effective value
Vrms
Conversion
factor
Vrms/ Vavg
Reading errors for
average sensing
instrument
≒0.637 ≒1.111 ≒1.414
≒1.155 ≒1.732
＝-3.8％
×100％
＝11.1％
≒0.707
2
1
22
π
A
3
D
13
2
D
1
3
A
0.5A×1.111- 3
A
A
A A
A
1
0.5A
1
0％
2A
π
＝
AD
f
A＝A・D
T
2
A
A×1,111-A ×100
×100
DA
D
1
＝
A
DA
（1.111 -1）
D
A
0
A
0
A
0
A
0
T
D=f/T
f
3


7

３．Specifications
●MeasuringRangesandAccuracy(at23 ℃ ± ５ ℃ ,relative
humidity75%orless)
ACCurrent  (RMSvaluedetection,Auto-range)
Range Displayrange Allowableinput Accuracy※
(Frequency)
400A 0.0〜420.0A
1.0〜1700Arms
±1.3%rdg±3dgt
(45〜66Hz)
±2.0%rdg±5dgt
(20Hz〜1kHz)
2000A 150〜2100A
1700〜2000Arms
(3000Apeakorless)
±2.3%rdg±3dgt
(45〜66Hz)
※Fornon-sinusoidalwaveforms,add±(1.5%offullscale),forCrest
factor<3.
※4countsorlessiscorrectedto0
DCCurrent ,Auto-range
Range Displayrange Allowableinput Accuracy
400A ±0.0〜420.0A 0.0〜±2000A ±1.3%rdg±2dgt
Afterzeroadjustments
2000A ±150〜2100A
ACVoltage  (RMSvaluedetection,Auto-range)
Range Displayrange Allowableinput Accuracy※
(Frequency)
40V 0.00〜42.00V
0.00〜750Vrms
(1200Vpeakorless)
±1.0%rdg±2dgt
(45〜66Hz)
±1.5%rdg±5dgt
(20Hz〜1kHz)
400V 15.0〜420.0V
750V 150〜788V
※InputImpedance：approx.2MΩ<200pF
※Fornon-sinusoidalwaveforms,add±(1.5%offullscale),forCrest
factor<3.
※4countsorlessiscorrectedto0


8

DCVoltage  (Auto-range)
Range Displayrange Allowableinput Accuracy
40V 0.00〜±42.00V
0.00〜±1000V ±1.0%rdg±2dgt400V ±15.0〜±420.0V
1000V ±150〜±1050V
※InputImpedance：approx.2MΩ
Resistance/Continuity (Auto-range)
Range Displayrange Allowableinput Accuracy
400Ω 0.0 〜 420.0Ω 0.0Ω〜 4000Ω ±1.5%rdg±2dgt
4000Ω 150 〜 4200Ω
※Open-loopVoltage：approx.3V,MeasuringCurrent:0.6mAorless
(400Ωrange)0.06mAorless(4000Ωrange)
※Thebuzzerturnsonforresistanceslowerthan20±1Ω.
FrequencyHz (ACCurrent) (Auto-range)
Range Displayrange Allowableinput Accuracy
1000Hz 8.0 〜 999.9Hz 10.0Hz 〜 1000Hz ±1.5%rdg±5dgt
4000Hz 900 〜 4200Hz 1000 〜 4000Hz ±1.5%rdg±5dgt
FrequencyHz（ACVoltage） (Auto-range)
Range Displayrange Allowableinput Accuracy
1000Hz 8.0 〜 999.9Hz 10.0Hz 〜 1000Hz ±1.5%rdg±5dgt
4000Hz 900 〜 4200Hz 900 〜 4000Hz ±1.5%rdg±5dgt


9

Output Outputvoltage：0.1mV ／ 1count
Range Allowableinput OutputVoltage(mVDC) Accuracy
DC400A 0.0〜±400.0A 0〜±400mV
Within±1mV
（Totheindicated
value）
DC2000A 0〜±2000A 0〜±200mV
AC400A 0.0〜400.0A 0〜400mV
AC2000A 0〜2000A 0〜200mV
※When the display is "OL", the output voltage is 420mV（"-OL"：
-420mV）
※Outputimpedance:about10kΩ
Note:◇The symbolof"―" intheabovetablemeansthatthe
instrument only displays the value, but the accuracy, the
properoperationandthesafetyarenotguaranteed.


10

●OperatingSystem ΔΣmodulation
●Display Liquidcrystaldisplaywithamaximum
countof4200plusannunciators
●OverrangeIndication "OL"isshownonthedisplay
●ResponseTime Approx.2seconds.
●SampleRate About3timespersecond.
●Safetystandard IEC 61010-1, 61010-2-032, 61010-
2-033, 61010-031 CAT IV 600V /
CATIII1000VPollutiondegree2
●EMC EN61326-1,EN61326-2-2
●RoHS EN50581
●Locationforuse Indoor/outdooruse,Altitudeupto2000m
●TemperatureandHumidity 23+/-5℃ ,relativehumidityupto75%
forGuranteedAccuracy withoutcondensation
●OperatingTemperature 0-40℃ ,relativehumidityupto85%
andHumidity withoutcondensation
●StorageTemperature -20-60℃ ,relativehumidityupto85%
andHumidity withoutcondensation
●PowerSource Two1.5VDCR6P(SUM-3)batteries
●CurrentConsumption Approx.40mAmax(ACA).
●Auto-power-offfunction Automatically powereddown in about
10minutesafterthelastswitch
operation
 (powerconsumption:about200μA)
●OverloadProtection DC/ACcurrentranges:
 2400AACfor10sec
 DC/ACvoltageranges:
 1200VAC/DCfor10sec
 Resistancerange:
 1000VAC/DCfor10sec
●WithstandVoltage 6720V AC, 50/60Hz for 5 seconds
betweenelectricalcircuitandhousing
caseormetalpartofthejaws
●InsulationResistance 10MΩ or greater at 1000V between
electrical circuit and housing case or
metalpartofthejaws
●ConductorSize Approx.55㎜diametermax.
●Dimensions 250(L)x105(W)x49(D)mm
●Weight About540g
●Accessories TestleadsM-7107A
 R6Pbattery
 CarryingcaseM-9094
 Instructionmanual
●OptionalAccessories Multi-TranM-8008
 OutputLeadM-7256.


11

４．Instrument Layout
①TransformerJaws
Pickupcurrentflowingthroughtheconductor.
②JawTrigger
 Operatesthetransformerjaws.PresstoopentheTransformerJaws.
③FunctionSelectorSwitch
Selectsfunction.Alsousedtopowertheinstrumenton.
④DataHoldButton
Freezes the display reading. "H" is shown on the display when
DataHoldisenabled.
 When the output lead is inserted into the output terminal, Data
Hold Switch operates as range selection switch.（See 7-4 output
terminal）
①
⑭
②
③
⑦
④
⑤
⑥
⑧⑩⑪
⑫
⑬
⑨
⑮
⑯


12

⑤ModeSelectorButton
Selects measuring mode. The instrument defaults to the normal
mode (NOR). Then, press this switch to cycle through measuring
modes.Inanymode,pressingthisswitchformorethanonesecond
returnstheinstrumenttothenormalmode.
⑥ZeroAdjust/ResetButton
 UsedforzeroadjustmentonDCAandresistanceranges.Alsoused
to reset the display reading in the PEAK mode. On DCA range,
"AUTO"isshownonthedisplaywhenauto-zeroingiscompleted.
(Auto-zeroingisavailableon400Arangeonly.)
⑦DigitalDisplay
 Fieldeffectdigitaldisplaywithmaximumreadingof4200.Function
symbols and decimal point are controlled by the microprocessor
basedontheselectedfunctionandmeasuringmode.
Normal
Average
Peak
Frequency
Normal
Average
Peak
Resistance
Continuity
check
Hz
Ω
Ω
ACA/ACV DCA/DCV Resistance
Continuity
Display Display Display
A／VA／V
AC DC
Voltage
Resistance
Data Hold
Average mode
Ampere
Low frequency input
DCA auto zeroPeak modeLow battery warning
Continuity check
Negative sign


13

⑧TerminalCover
Slides over V/Ω and COM Terminals to prevent access to them
whenOUTPUTterminalisinuse.
⑨OUTPUTTerminal(ForACorDCcurrentrangeonly)
ProvidesDCvoltageoutputinproportiontotheACorDCcurrent
reading.Theoutputisconnectedtoarecordingdevicesuchasa
chart recorder for long hour monitoring. No output is available on
voltageandresistanceranges.
⑩COMTerminal
Acceptstheblacktestleadforvoltageorresistancemeasurement.
⑪V/ΩTerminal
Acceptstheredtestleadforvoltageorresistancemeasurement.
⑫SafetyHandStrap
Preventstheinstrumentfromslippingoffthehandduringuse.
⑬TestLeads(Model7107A)
Connected to COM and V/Ω terminals for voltage or resistance
measurement.
⑭Barrier/⑯Protectivefingerguard
Itisapartprovidingprotectionagainstelectricalshockand
ensuring theminimumrequiredairandcreepagedistances.
⑮TestLeadCap
UncappedconditionforCATIIenvironment
CappedconditionforCATIII/IVenvironments
TheCapshuldbefirmlyattachedtotheprobes.
TestleadscanbeusedundertheCATIIandCATIIIandCATIV
environments by attaching a protective cap as illustrated below.
Use of our protective cap offers different lengths suitable for the
testenvironments.
Whentheinstrumentandthetestleadarecombinedandused
together,whicheverlowercategoryeitherofthembelongstowillbe
applied.
Protective fingerguard
Cap


14

５．Preparation for Measurement
５－１ Checking Battery Voltage
①Setthefunctionselectorswitchtoanypositionotherthan
"OFF".
②When the display is clear without "BATT" showing, proceed to
measurement.
③When the display blanks or "BATT" is indicated, replace the
batteryaccordingtosection8.BatteryReplacement.
NOTE
●The Auto-power-off feature automatically turns the instrument
offinabout10minutesafterthelastswitchorbuttonoperation.
Therefore, the display may be blank even with the function
selector switch set to a position other than "OFF". To operate
the instrument in this case, turn the switch back to the "OFF"
position,thentoanyotherposition.
５－２ Checking Switch Setting and Operation
Make sure that the function selector switch is set to the correct
position,theinstrumentissettothecorrectmeasuring mode
andtheDataHoldfunctionisdisabled.Otherwise,desired
measurement cannot be made. (See section 6 for measurement
instructionsandsection7fornotesonfunctions.)


15

６．Measurement
６－１ DC Current Measurement
DANGER
●Donotmakemeasurementonacircuitabove1000VDC.
This may cause shock hazard or damage to the instrument or
equipmentundertest.
●Do not make measurement with the battery compartment cover
removedfromtheinstrument.
●Donotmakecurrentmeasurementwiththetestleadsconnected
totheV/ΩandCOMterminals.
●Keep yourfingersandhands behind thebarrierduring
measurement.
①Setthefunctionselector switchtothe"Ａ"position.DC"
shouldbeshownontheupperleftcornerofthedisplay.
②Withthetransformerjawsclosedandwithoutclampingthemonto
the conductor, press the Zero Adjust/Reset button for about one
secondtozeroadjustthedisplay.(Zeroadjustfeatureisfor400A
rangeonly.)Whenzeroadjustmentiscompleted,"AUTO"appears
onthedisplay.
③Pressthetriggertoopenthetransformerjawsandclampthemonto
theconductorundertest,thentakethereadingonthedisplay.The
mostaccuratereadingwillbeobtainedbykeepingtheconductorat
thecenterofthetransformerjaws.
Correct Wrong


16

NOTE
●Duringcurrentmeasurement,keepthetransformerjawsfully
closed. Otherwise, accurate measurement cannot be made. The
maximummeasurableconductorsizeisapprox.55mmindiameter.
●When the current flows from the upside (the display side) to the
undersideoftheinstrument,thereadingisindicatedpositive.
●TheZeroAdjust/Resetbuttonmaynotcompletelyzeroadjustthe
outputvoltagefromtheOUTPUTterminal.Inthiscase,makezero
adjustmentontherecordingdevice.
●Turing thefunction selectorswitch to a position otherthan DCA
cancelsthezeroadjustment.
６－２ AC Current Measurement
DANGER
●Neveruse the instrument on acircuit above750VAC. Thismay
cause electrical shock hazard and damage to the instrument or
thecircuitundertest.
●Do not make measurement with the test leads plugged into the
instrument.
●Do not make measurement with the battery compartment cover
removed.
●Keep yourfingersandhands behind thebarrierduring
measurement.
Correct Wrong


17

①Set the function selector switch to the " 〜 A" position.AC"
shouldbeshownontheupperleftcornerofthedisplay.
②Press the trigger to open the transformer jaws and clamp them
ontoasingleconductorandtakethereadingonthedisplay.The
mostaccuratereadingwillbeobtainedbykeepingtheconductor
atthecenterofthetransformerjaws.
NOTE
●During current measurement, keep the transformer jaws fully
closed.Otherwise,accuratemeasurementscannotbetaken.
Maximumconductorsizeis55㎜indiameter.
●ZeroadjustmentisnotnecessaryinACcurrentmeasurement.
●Whenthecurrentundertestmeasures3%oftherangeorless,
orthefrequencyofthecurrentislow,"LoHz"isindicatedonthe
display.
６－３ DC Voltage Measurement
DANGER
●Neverusetheinstrumentonacircuitabove1000VDC.Thismay
cause electrical shock hazard and damage to the instrument or
thecircuitundertest.
●Do not make measurement with the battery compartment cover
removed.
●Keep your fingers and hands behind the protective fingerguard
duringmeasurement.
Redtestlead
Black
testlead


18

①Set the function selector switch to the "Ｖ" position.DC"
shouldbeshownontheupperleftcornerofthedisplay.
②SlidetheterminalcovertothelefttodisclosetheV/ΩandCOM
terminals.Plugthe redtestlead into theV/Ωterminal andthe
blacktestleadintoCOMterminal.
③Connectthetipoftheredandblacktestleadstothepositive(+)
andnegative(-)sidesofthecircuitundertestrespectively.Take
the reading on the display. If the connection is reversed, the
displayindicatesthe"-"sign.
６－４ AC Voltage Measurements
DANGER
●Neveruse the instrument on acircuit above750VAC. Thismay
cause electrical shock hazard and damage to the instrument or
thecircuitundertest.
●Do not make measurement with the battery compartment cover
removed.
●Keep your fingers and hands behind the protective fingerguard
duringmeasurement.
①Set the function selector switch to the " 〜 V" position. "AC"
shouldbeshownontheupperleftcornerofthedisplay.
②SlidetheterminalcovertothelefttodisclosetheV/ΩandCOM
terminals.PlugtheredtestleadintoV/Ωterminalandtheblack
testleadintotheCOMterminal.
Redtestlead
Black
testlead