KYORITSU KEW SNAP Series KEW2040 User Manual

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.
● Understa 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.
● Never o pen 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 in w ate r o r neu tra l
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 at egories co rrespond to e le ctrical
environment s with grea ter momentary 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/ D UTY 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 i nst rumen t i s set to the c orrec t
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

KYORITSU KEW SNAP Series KEW2040 Specifications

General

Model	KEW2040
Type	Clamp Meter
AC Voltage Measurement	600 V
DC Voltage Measurement	600 V
Display	Digital
Battery	2 x LR03 (AAA)
Safety Standard	IEC 61010-1 CAT III 300V / CAT II 600V
Weight	Approx. 220g (including batteries)

Summary

Features

Safety Warnings

Specifications

Measuring Range & Accuracy

Details AC/DC current, voltage, resistance, and frequency ranges and their accuracy specifications.

General Specification

Covers display, range switching, sample rate, functional construction, power source, and environmental conditions.

Function Keys

Outlines the available functions for each key (HOLD, SELECT, ZERO, Hz/DUTY, MIN/MAX) across different ranges.

Measurement

AC Current Measurement

Step-by-step guide for measuring AC current using the clamp meter, including safety warnings.

DC Current Measurement

Detailed procedure for measuring DC current, emphasizing safety precautions and key operations.

AC Voltage Measurement

Instructions for measuring AC voltage, including the use of Hz/DUTY function and safety notes.

DC Voltage Measurement

Procedure for measuring DC voltage, highlighting connection methods and safety precautions.

Resistance/ Cont/ Diode Measurement

Guide for measuring resistance, continuity, and diodes, with specific instructions for each mode.

Other Functions

Sleep Function

Explains the automatic power-off feature to conserve battery and how to exit sleep mode.

HOLD Key

Describes the Data Hold function to freeze readings and the Backlight ON/OFF feature.

NCV Function

Details the Non-Contact Voltage detection feature and its operational indicators.

MIN/MAX Function

Instructions for capturing minimum and maximum values during measurements.

ZERO Function

Explains the zero adjustment function for current measurements and relative value indication.

Battery Replacement

Maintenance