Kyoritsu Electrical Instruments Works, Ltd. KEW 2055 User manual

INSTRUCTION MANUAL
DIGITAL CLAMP METER
KEW 2055
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.
● 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.
● 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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
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 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 opentheBatterycoverduring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.
● Verify proper operation ona known source before
use or taking action as a result indication of the
instrument.
● Keepyourfingersandhandsbehindtheprotective
fingerguardduringmeasurement.
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.
● Stop using the test lead if the outer jacket is
damaged and the inner metal or color jacket is
exposed.

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.
● Use a cloth dipped in water or neutral detergent
for cleaning the instrument. Do not use abrasives
orsolvents.
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).
3. Specification
3-1. Measuring range & accuracy
(accuracyguaranteedat23 ℃± 5 ℃ .humidity45 〜 85%)
ACCurrent600A,1000AFunction
Function Measuring
Range Accuracy
600A 0-600.0A
± 1.5%rdg ± 5dgt
(50/60Hz)
± 3.5%rdg ± 8dgt
(40-400Hz)
1000A 0-1000A
DCCurrent600A,1000AFunction
Function Measuring
Range Accuracy
600A
0-600.0A
± 1.5%rdg ± 5dgt
1000A
0-1000A
ACVoltageFunction

（ Auto-ranging,Inputimpedance:approx.10M Ω）
Range Measuring
Range Accuracy
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
600mV/6/
60/600V 0-600.0V
± 1.0%rdg ± 3dgt
Resistance
（ Continuity/DiodeCheck ） Function
Range Measuring
Range Accuracy
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
Frequency/DUTYFunction
（ Auto-rangingfor
Frequency
）
Range Measuring
Range Accuracy
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
t h e  m e a s u r i n g  r a n g e .  ( e x c e p t  f o r  A C / D C V  a n d  1 0 0 0 A 
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/DCA/ACV/DCV/ Ω 
● Keys  :
SELECT(AC/DCswitching&/ Ω / / ),REL Δ ,
Hz/DUTY,MIN/MAX,HOLD/BackLight
● 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.
● Locationforuse
Outdooruse,Altitudeupto2000m
● ApplicableStandards
IEC61010-1,61010-2-032,61010-2-033
MeasurementCATIV600VPollutiondegree2
IEC61010-031
EMC ： EN61326-1
・ EN55022
・ EN61000-4-2(performancecriterionB)
・ EN61000-4-3(performancecriterionB)
● RoHS ： EN50581
● OverloadProtection
CurrentRange :1200AAC/DC/10sec
VoltageRange :720VAC/DC/10sec
ResistanceRange :600VAC/DC/10sec
● WithstandVoltage
6720V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
approx.40mm
● Dimension
approx.254(L) × 82(W) × 36(D)mm
● Weight:approx.:310g
● Accessories
TestLeads Model7066A/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
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
position,theinstrumentissettothecorrect
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.
● Keep your fingers and hands behind the barrier on
theinstrumentduringameasurement.
(1)SettheFunctionSwitch to "
600A " or " 1000A "
position.
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.
(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 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
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.
● Keepyourfingersandhandsbehindthebarrieron
theinstrumentduringameasurement.
(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
display.
Barrier
O: Device which is
not directly
connected to the
mains power supply
Protectivefingerguard(Barrier) ：
It is a part providing protection against electrical
shockand ensuring the minimumrequired airand
creepagedistances.
Cap
：
UncappedconditionforCATIIenvironment
CappedconditionforCATIII/IVenvironments
TheCapshuldbefirmlyattachedtotheprobes.
Whenthe instrument and the test lead are combined
andusedtogether,whicheverlowercategoryeitherof
thembelongstowillbeapplied.
Cap
Protective fingerguard

5-4. DC Voltage Measurement
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.
●

Keepyourfingersbehindtheprotectivefigerguard
ontheinstrumentduringmeasurement.
(1)SettheFunctionSwitchto"
DCV "position.
(2)ConnecttheredtestleadtoV/
Ω terminalandthe
blacktestleadtoCOMterminal.
(3)Connect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"-"mark.
5-5. Resistance/ Cont/ Diode Measurement
DANGER
● Neverusetheinstrumentonanenergizedcircuit.
● Donot make measurementwith the Battery
Coverremoved.
Resistance
(1)SettheFunctionSwitchto" Ω/ Cont/ Diode " 
position.
(2)ConnecttheredtestleadtoV/
Ω terminalandthe
black test lead to COM terminal. Confirm "OL" is
indicatedonthedisplay,andthenshort-circuitthe
tipsoftestleadstomaketheindicationzero.
(3)Connect the test leads to the both ends of the
resistorundertest.
(4)Takethereadingonthedisplay.
CAUTION
●

Evenifshortthetestleadtips,indicatedvalue
maynotbezero.Butthis is because of the
resistanceoftestleadsandnotafailure.
● Whentestleadsareopen,"OL"isindicatedon
thedisplay.
● Keepyourfingers andhandsbehindthebarrier
duringmeasurement.
Continuity
(1)SettheFunctionSwitchto" Ω/ Cont/ Diode " 
position. "
Ω "  has been selected by default; press
theSELECTkeytochangeitto"
Continuity ".
Resistance ⇨ Cont ⇨ Diode

(2)ConnecttheredtestleadtoV/ Ω terminalandthe
black test lead to COM terminal. Confirm "
OL " is
indicated on the display and short-circuit the tips
of test leads. Indication should become zero and
buzzersounds.
(3)Connect the test leads to the both ends of the
conductor under test. The buzzer sounds, if the
resistanceundertestis100
Ω orless.
Diode
(1)SettheFunctionSwitchto" Ω/ Cont/ Diode "
position. "
Ω " has been selected by default; press
theSELECTkeytochangeitto"
Diode "
Resistance ⇨ Cont ⇨ Diode
(2)ConnecttheredtestleadtoV/ Ω terminalandthe
blacktestleadtoCOMterminal.
(3)ConnecttheredandblacktestleadstotheAnode
and Cathode of the diode under test respectively.
Takethereading on the display. If the connection
isreversed,thedisplayindicates"
OL ".
CAUTION
● Someof diodescannotbetested.Indication on
thedisplaywillbe"OL".
 (Zenerdiode,LEDand
soon)
6. Other functions
6-1. Sleep Function
(1)This is a function to prevent the instrument from
beingleftpoweredoninordertoconservebattery
life.
Thisfunctioncausestheinstrumenttoenter
Sleepmodeabout15minutesafterthelast
key operation. To exit the Sleep mode, turn the
Functionswitchto"
OFF ",thentoanyotherposition,
orpressanyKey.
(2)SleepFunctionisdisabledwhen;MIN/MAX
Function is selected. Continuous measurement is
made with the Sleep Function being disabled. To
activate Sleep Function again, disable the MIN/
MAXFunction.
CAUTION
● The instrument consumes small amount of
batterypowerintheSleepmode. Set the
FunctionSwitchtotheOFFpositionafteruse.
6-2. HOLD Key
(1)DataHoldFunction
This is a function to freeze the measured value
onthedisplay.Pressthe"HOLD" key to freeze the
reading.
The reading will be held regardless of subsequent
variationininput."
H "isindicatedontheupperleft
cornerofthedisplaywhiletheinstrumentisinthe
DataHoldmode.ToexitDataHoldmode,pressthe
"HOLD"keyagain.
CAUTION
● Held readings are released when Sleep
Functionisactivatedwhiletheinstrumentisin
theDataHoldmode.
(2)BacklightON/OFF
PressingtheHOLDkey2secormorelightsupthe
Backlight. Pressing the HOLD key 2 sec or more
againturnsofftheBacklight.
6-3. NCV Function
Red LED on the upper area on the Panel lights up
at all functions except for OFF when electric field
exceeding 100V is detected by the sensor installed in
theJaws.
Itindicatesapresenceof
voltageinanelectricalcircuit
or equipment without touching
them.
NCVSensorcandetect
electrical field only from the
directionindicatedintheright
figure.
Putthefixedelement(left
side) closer to the conductor
undertest.
Detectionagainstin-wall
outletisimpossible.
DANGER
●

TheLEDmaynotlight upduetoinstallation
conditionofelectricalcircuitorequipment.Never
touchthecircuitundertestto avoid possible
dangereveniftheLEDforNCVdoesn
 tlightup.
●

Check the functionality of LED on a well-known
powersupplypriortomeasurement.WhentheLED
doesn
 tlightup,donotmakemeasurement.
● NCV indication is affected by external voltage,
howtoholdorplacetheinstrument.
● Keep your fingers and hands behind the barrier
duringmeasurement.
6-4. MIN/MAX Function
CAUTION
● SELECT,ZERO,Hz/DUTYkeys are disabled
whileMIN/MAXFunctionisbeingactivated.
(1)
AC/DC Current Range
Pressing theMIN/MAXKey at 600A&1000A
Function enables min or max value measurement.
PresstheMIN/MAXKeytoselectMAXorMIN.The
maxorminvaluewithinmeasuringrange isbeing
held until this function is disabled. "MIN" or "MAX"
is indicated on the display while this function is
being activated. To disable this function, press
down the MIN/MAX Key at least 2 sec or change
functions.
(2)
AC/DC Voltage Range 
CAUTION
● PressingtheMIN/MAXKeywithoutapplying
voltage disables the Auto-ranging function and
fixes the Range to 6V. Connect the test leads to
thecircuitundertest and press the MIN/MAX Key
after an appropriate range is selected by Auto-
rangingfunction.
Pressing the MIN/MAX Key enables min or max value
measurement. Press the MIN/MAX Key to select MAX
orMIN.Themaxorminvaluewithinmeasuringrange
is being held until this function is disabled. "MIN" or
"MAX"isindicatedonthedisplaywhilethisfunctionis
beingactivated.
Todisablethisfunction,pressdowntheMIN/MAXKey
atleast2secorchangefunctions.
6-5. ZERO Function
CAUTION
●

MIN/MAX, PEAK keys are disabled while ZERO
Functionisbeingactivated.
ZeroAdjustment FunctionatCurrentRange "
Δ "mark
istobeindicatedattheupperrightonthedisplaywhile
ZEROfunctionisbeingoperated.Indicationofrelative
value at Current, Voltage, Resistance: Pressing the
ZERO Key indicates REL (relative value) Press the
ZERO Key to save the initial value at the start of
measurementasareferencevalue.Thenthedifference
betweenthelatermeasured values and the reference
valueisindicatedonthedisplay.
TheAuto-rangingfunction is disabled, while this
functionisbeingactivated, andtheRange isfixedto
theRangeselectedatthestartofmeasurement.
Relativevalueisindicatedwithinfollowingranges.
（ Measuringrange ）
=(Full-scalevalueatthefixedRange)‒(Initialvalue)
Todisablethisfunction,pressdowntheMIN/MAXKey
atleast2secorchangefunctions.
6-6. Over-flow indication
When the input exceeds the measuring range at each
FunctionotherthanVoltageand1000ARange,"OL"or
"-OL"isindicatedonthedisplay.
7. Battery Replacement
WARNING
●

MIN/MAX,PEAKkeysare disabledwhileZERO
Functionisbeingactivated.
CAUTION
●

Donotmixoldandnewbatteries.
●

Installbatteriesincorrectpolarityasindicated
intheBatteryCompartment.
ReplacethebatterieswhenaLow Battery
Voltage warning "BATT" mark is indicated on the
display. Note that when the battery is completely
exhausted,thedisplayblankswithout"
BATT "mark
shown.
(1)SettheFunctionSwitchto"OFF"position.
(2)Unscrew and remove the Battery Compartment
Coveronthebottomoftheinstrument.
(3)Replace the batteries observing correct polarity.
UsenewR03(AAA)orLR03/1.5Vbatteries.
(4)Install the Battery Compartment and tighten the
screws.
(2)With thetransformerjawsclosedandwithout
clampingthemontotheconductor,pressthe
"
ZERO " key to zero adjust the display. (mark is
displayedattheupperrightonthedisplay.)
(3)Pressthetriggertoopenthetransformerjawsand
clampthemontotheoneconductorundertest,the
conductorshouldbeatthecenterofthejaws,then
takethereadingonthedisplay.
(4)SettheFunctionSwitchto an appropriateposition
accordingtocurrentundertest.
(5)Pressing the  "
ZERO "  key again releases  " ZERO " 
function. (mark at the upper right on the display
disappears.)
CAUTION
● When the current flows from the upside (the
displayside)totheundersideoftheinstrument,the
polarityofthereadingispositiveandviceversa.
5-3. AC Voltage Measurement
DANGER
● Never make measurement on a circuit in which
voltageoverAC600V exists to avoid getting
electricalshock.
● DonotmakemeasurementwiththeBatteryCover
removed.
● Keepyourfingersbehindtheprotective
fingerguardontheinstrumentduringmeasurement.
(1)SettheFunctionSwitchto"
ACV "position.
(2)ConnecttheredtestleadtoV/
Ω terminalandthe
blacktestleadtoCOMterminal.
(3)Connect the test leads to the circuit under test.
Takethereadingonthedisplay.Pressingthe
"
Hz/DUTY "keywhilereadingisindicatedon
the display switches the indication in following
sequence.
AC Voltage ⇨ Hz ⇨ DUTY
CAUTION
● Hz/DUTYFunctionrequiresAC40Vorhigher.
● To measure a frequency, measure the voltage on
theelectricalcircuitinadvance.
● Then press the Hz/DUTY key to enter into
frequencymeasurement.
● Readings offrequencymayfluctuateorbe
influencedundernoisyenvironment.
Anode
Cathode
92-1801D12-18
8. Maintenance
● Cleaning
Use a cloth dipped in water or neutral detergent for
cleaningtheinstrument.
Donotuseabrasivesorsolvents.Otherwise,instrument
getdamaged,deformedordiscolored.