KYORITSU KEW SNAP Series KEW2040 - DC Current Measurement; AC Voltage Measurement

INSTRUCTIONMANUAL
DIGITALCLAMPMETER
KEWSNAP
SERIES
KEW2040  600AACOnlyType
KEW2055 1000AAC/DCType
１．Features
● Designedtomeetinternationalsafetystandards.
IEC61010-1.IEC61010-031:2002&IEC61010-2-032
MeasurementCategory(CAT.)IV600V
PollutionDegree2
● Double molded main body provides comfortable

singlehandedgrip
● DataHoldFunction
● LCD Backlight function to facilitate working at
dimlylitsituations.(KEW2055only)
● RELfunctiontoindicatemeasurementvariation.
(Current,voltage,Resistancemeasurement)
● MIN/MAX function enables easy reading of min &
maxvalueduringmeasurement.
● WithContinuity&DiodeCheckFunction
● NCV （ Non Contact Voltage ） Function for wiring
check.
● 600Vinputprotection.
● Sleepfunctiontoextendbatterylife.
● WithBarGraph,6039counts
2.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 passed the inspection. 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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.
● U n d e rst a n d a n d f o l l o w a l l t h e s a f e t y
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.
● Marks listed in the table below are used on this
instrument.
Usermustrefertothemanual.
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.
AC
 DC
AC&DC
DANGER
● Nevermakemeasurementonacircuitinwhich
voltageoverAC600Vexists.
● 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.
● 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 attempt to use the instrument if its
surfaceoryourhandiswet.
● Donotexceedthemaximumallowableinputof
anymeasuringrange.
● N eve r ope n t he Bat ter y cov er d uri ng a
measurement.
●  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.
WARNING
● Never attempt to make measurement if any
abnormal conditions, such as broken case
and exposed metal parts are found on the
instrument.
●
Do not rotate the Function Switch while the
testleadsarebeingconnected.
● Do not install substitute parts or make any
modification to the instrument. For repair or
re-calibration, return the instrument to your
localdistributorfromwhereitwaspurchased.
● Do not try to replace the batteries if the
surfaceoftheinstrumentiswet.
● Disconnect all the cords and cables from the
objectundertestandpowerofftheinstrument
before opening the Battery Cover for Battery
replacement.
● Verify proper operation on a known source
before use or taking action as a result of the
indicationoftheinstrument.
● Use appropriate personal protective equipment
suchasinsulatinggloves,Insulatingboots,and
safetyglasses.

CAUTION
● Set the Function Switch to an appropriate
positionbeforestartingmeasurement.
● Firmlyinsertthetestleads.
● Disconnect the test leads from the instrument
forcurrentmeasurement.
● Donotexposethe instrumenttothedirectsun,
hightemperatureandhumidityordewfall.
● Altitude 2000m or less. Appropriate operating
temperatureiswithin0
℃ and40 ℃ .
● Thisinstrumentisn  tdust&waterproofed.Keep
awayfromdustandwater.
● Be sure to power 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.
● U se a c lot h dip ped i n w ate r or neutr al
detergent for cleaning the instrument. Do not
useabrasivesorsolvents.
Measurementcategories (Over-voltagecategories)
To ensure safe operation of measuring instruments,
IEC61010 establishes safety standards for various
electrical environments, categorized as CAT.I to
CAT.IV, and called measurement categories. Higher-
nu mbered c ategories correspon d to elect ri ca l
environments with greate r mome nt ary energy,
so a measuring instrument designed for CAT.III
environments can endure greater momentary energy
thanonedesignedforCAT.II.
CAT.Ⅰ :Secondary electricalcircuitsconnectedtoan
ACelectricaloutletthroughatransformeror
similardevice.
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 over current protection device
(distributionpanel).
3.Specification
3-1.Measuringrange&accuracy
(accuracyguaranteedat23 ℃± 5 ℃ .humidity45 〜 85%)
ACCurrent600A,1000AFunction
Function
Measuring
Range
Accuracy
KEW2040 KEW2055
600A 0-600.0A
± 1.5%rdg ± 5dgt
(50/60Hz)
± 3.5%rdg ± 8dgt
(40-400Hz)
± 1.5%rdg ± 5dgt
(50/60Hz)
± 3.5%rdg ± 8dgt
(40-400Hz)
1000A 0-1000A N/A
DCCurrent600A,1000AFunction
Function
Measuring
Range
Accuracy
KEW2040 KEW2055
600A
0-600.0A N/A
± 1.5%rdg ± 5dgt
1000A 0-1000A N/A
ACVoltageFunction

（ Auto-ranging,Inputimpedance:approx.10M Ω）
Range
Measuring
Range
Accuracy
KEW2040 KEW2055
6/60/600V 1-600.0V
± 1.3%rdg ± 4dgt(50/60Hz)
± 3.0%rdg ± 5dgt(40 〜 400Hz)
DCVoltageFunction

（ Auto-ranging,Inputimpedance:approx.10M Ω）
Range
Measuring
Range
Accuracy
KEW2040 KEW2055
600mV/6/
60/600V
0-600.0V
± 1.0%rdg ± 3dgt
Resistance （ Continuity/DiodeCheck ） Function
Range
Measuring
Range
Accuracy
KEW2040 KEW2055
600
Ω /6k/
60k/600k
Ω
6M Ω
0-6M Ω ± 1.0%rdg ± 5dgt
60M Ω
6.00M-
60.00M
Ω
± 5%rdg ± 8dgt
ContBuzzer 0-600.0 Ω Thresholdvalue:60 Ω± 30 Ω 
Diode Testvoltage:0-2V
Frequ enc y/ DU TY F uncti on （ Auto- ran gin g f or
Frequency
）
Range
Measuring
Range
Accuracy
KEW2040 KEW2055
ACA 40Hz − 400Hz
± 0.5%rdg ± 5dgt
ACV 1Hz 〜 10kHz
0.1-99.9%
(Pulsewidth/Pulseperiod)
± 2.5%rdg ± 5dgt
Note:Measurableinputsare:40Vrms@ACVor
60Arms@AC600A,350A@AC1000ARange
3-2.GeneralSpecification
● Modeofoperation : Δ ∑mode
● Display  :max.6039counts

(Frequency:9999)&Bargraph
●  Over-range indication : "OL" displayed when exceeding
the measuring range. (except for AC/DCV and 1000A
Function)
● Rangeswitching :
Auto-ranging/Voltage,ResistanceRange
Singlerange/Continuity,Diodecheckand DUTY
● Samplerate :threetimespersecond
● Functionalconstruction:
OFF/ACA/ACV/DCV/ Ω KEW2040
OFF/ACA/DCA/ACV/DCV/ Ω KEW2055
● Keys  :
SELECT(AC/DCswitching&/ Ω / / ),REL Δ ,
Hz/DUTY,MIN/MAX,HOLD/BackLight(KEW2055)
● Powersource :DC3V/R03(UM-4)x2pcs
● Lowbatterywarning : " "markisdisplayedat
  2.4V ± 0.15Vorless.
●  Temperature & humidity : 23 ℃± 5 ℃ , relative humidity

accuracyguaranteed85%orless(nocondensation)
● Operatingtemperature:0 〜 40 ℃ ,relativehumidity
&humidityrange85%orless(nocondensation)
● Storagetemperature :-20 〜 60 ℃ ,relativehumidity 
&humidityrange85%orless(nocondensation)
● Currentconsumption:approx.12mA
● SleepFunction:Automaticallypoweredoffinabout
15minafterthelastFunctionswitchoperation.
Press any key or rotate the Function Switch from
OFFtoanypositiontoexitfromtheSleepstate.
● ApplicableStandards
IEC61010-1:2001
MeasurementCAT.IV600VPollutiondegree2
IEC61010-031:2002,IEC61010-2-032
EMC ： EN61326
・ EN55022
・ EN61000-4-2(performancecriterionB)
・ EN61000-4-3(performancecriterionB)
● OverloadProtection
CurrentRange :720AAC/10sec@KEW2040

1200AAC/DC/10sec@KEW2055
VoltageRange :720VAC/DC/10sec
ResistanceRange :600VAC/DC/10sec
● WithstandVoltage
6880VAC （ TRMS50/60Hz ） /5sec
(betweenJawsandelectricalcircuit/betweeninternal 
circuitandenclosure)
● InsulationResistance:10M Ω ormore/1000V
（ betweenelectricalcircuitandenclosure ）
● Conductorsize
KEW2040:approx.33mm
KEW2055:approx.40mm
● Dimension
approx.254(L) × 82(W) × 36(D)mm/KEW2055
approx.243(L) × 77(W) × 36(D)mm/KEW2040
● Weight:approx.:300g@KEW2040
:310g@KEW2055
● Accessories
TestLeads Model7066/1set
BatteryR03 （ UM-4 ） /2pcs
InstructionmanualEnglish,Japanese/1pce
CarriyngCaseModel9094/1pcs
3-3.FunctionKeys
The" ● "markshowsavailablefunctionateachRange.
DCCurrentMeasurement(KEW2055only)
HOLD SELECT ZERO
Hz/
DUTY
MAX/
MIN
ACA ● ● ● ● ●
ACV ● - ● ● ●
DCA ● ● ● - ●
DCV ● - ● - ●
Ω ● ● ● - ●
- ● - - -
- ● - - -
4.Preparationformeasurement
4-1.CheckingBatteryVoltage
Set the Function Switch to any position other than
" OFF ".Whenthedisplay isclearwithout" BATT "mark,
showing, battery voltage is enough. When the display
is blank or
 " BATT "  mark is indicated, replace the
batteriesaccordingtoSection7,BatteryReplacement.
CAUTION
The Sleep feature automatically powers the
instrument off in about 15 min after the last
switch or key operation. Therefore, the display
may beblankevenwiththeFunction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,
orpressanykey.Replacethebatteriesifnothing
wasdisplayedafteraboveoperations.
4-2.CheckingSwitchSetting&Operation
Confirm the Function Switch is set to the correct
posit ion , t he in str ument i s s et to t he c orr ect
measurementmode,
and the Data hold function is disabled. Otherwise,
desiredmeasurementcannotbemade.
5.Measurement
5-1.ACCurrentMeasurement
DANGER
● Nevermake measurementon a circuitin which
voltage over AC600V exists to avoid getting
electricalshock.
● 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
Coverremoved.
● Disconnectthetestleadsfromtheinstrumentfor
currentmeasurement.
(1)Set the Function Switch to "
600A " or " 1000A "
position.(onKEW2040,only"600A"isavailable)
AChasbeenselectedbydefault;presstheSELECT
key, when DC has been selected, to change it to
AC.ACmarkis displayed attheupper left on the
display.(KEW2055only)
(2)Press the trigger to open the transformer jaws
andclampthemontotheoneconductorundertest,
then take the reading on the display. Pressing the
" Hz/DUTY "Keyswitchestheindicationinfollowing
sequence.
ACCurrent  ⇨  Hz  ⇨  DUTY
Hz/DUTY
 Function requires 60A or more at AC600A
Rangeand350AormoreatAC1000Arange.
CAUTION
● MaxconductorsizeforKEW2040isapproxdia.
33mm and for KEW2055 is approx dia. 40mm.
During current measurement, keep the trans
former jaws fully closed. Other wise, accurate
measurementscannotbetaken.
5-2.DCCurrentMeasurement(KEW2055only)
DANGER
● Nevermakemeasurementonacircuitinwhich
voltage over DC600V exists to avoid getting
electricalshock.
● Do not make measurement with the Battery
Coverremoved.
(1)Set the Function Switch to "
600A " or " 1000A "
position. AC has been selected by default; press
the SELECT  key, when AC has been selected, to
changeittoDC.
DC mark is displayed at the upper left on the
Transformer