INSTRUCTION MANUAL
DIGITAL CLAMP METER
KEW 2055
1.Features
●
Designedtomeetinternationalsafetystandards.
 
IEC61010-1.IEC61010-031:2002&IEC61010-2-032
 
MeasurementCategory(CAT)IV600V
 
PollutionDegree2
●
         Double molded main body provides comfortable
singlehandedgrip
 
●
DataHoldFunction
●
       LCD Backlight function to facilitate working at
dimlylitsituations.
●
RELfunctiontoindicatemeasurementvariation.
 
(Current,voltage,Resistancemeasurement)
●
             MIN/MAX function enables easy reading of min &
maxvalueduringmeasurement.
●
WithContinuity&DiodeCheckFunction
●
NCV
(
 Non Contact Voltage
)
 Function for wiring
check.
●
600Vinputprotection.
●
Sleepfunctiontoextendbatterylife.
●
WithBarGraph,6039counts
2. Safety Warnings
           This instrument has been designed, manufactured and
testedaccordingtoIEC61010:Safetyrequirementsfor
 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
              safeoperation of the instrument and retain it in safe
condition.
         Therefore, read through these operating instructions
beforeusingtheinstrument.
 
WARNING
●
         Read through and understand the instructions
   contained in this manual before using the
instrument.
●
     Keep the manual at hand to enable quick
referencewhenevernecessary.
●
Theinstrumentistobeusedonlyinitsintended
applications.
●
   U n d e r s t a n d a n d f o l l o w a l l t h e s a f e t y
instructionscontainedinthemanual.
             Failure tofollow 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
contradictiontothiscautionarynote.
Thesymbol indicatedontheinstrumentmeansthat
theusermustrefertotherelatedpartsinthemanual
         forsafe operation ofthe instrument. It isessential to
       read the instructions wherever the     symbol appears
inthemanual.
 
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.
Usermustrefertothemanual.
Instrumentwithdoubleorreinforcedinsulation
           Indicates that this instrument can clamp on
       bare conductors when measuring a voltage
       corresponding to the applicable measurement
category,whichismarkednexttothissymbol.
AC
  DC
AC&DC
Thisinstrumentsatisfiesthemarkingrequirement
 defined in the WEEE Directive (2002/96/EC).
     This symbol indicates separate collection for
electricalandelectronicequipment.
 
DANGER
●
            Never make measurement on a circuit in which
voltageoverAC600Vexists.
●
     Do not attempt to make measurement in the
         presenceof flammable gasses. Otherwise, the use
             of the instrument may cause sparking, which can
leadtoanexplosion.
●
         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
possibilityofshorting.
●
Neverattempttousetheinstrumentifitssurface
oryourhandiswet.
●
             Do not exceed the maximum allowable input of
anymeasuringrange.
●
     N e v e r o p e n t h e B a t t e r y  c o v e r d u r i n g a
measurement.
●
                 The instrument is to be used only in its intended
   applications or conditions. Otherwise, safety
functionsequippedwiththeinstrumentdoesn
twork,
           and instrument damage or serious personal injury
maybecaused.
●
           Verify proper operation ona known source before
                use or taking action as a result indication of the
instrument.
●
Keepyourfingersandhandsbehindtheprotective
fingerguardduringmeasurement.
 
WARNING
●
   Never attempt to make measurement if any
abnormal conditions, such as broken case and
exposedmetalpartsarefoundontheinstrument.
 
●
               Do not rotate the Function Switch while the test
leadsarebeingconnected.
●
       Do not install substitute parts or make any
   modification to the instrument. For repair or
           re-calibration, return the instrument to your local
distributorfromwhereitwaspurchased.
●
              Donot try to replace the batteries if the surface
oftheinstrumentiswet.
●
       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 ona known source before
useortakingactionasaresultoftheindicationof
theinstrument.
●
   Use appropriate personal protective equipment
       such as insulating gloves, Insulating boots, and
safetyglasses.
●
           Stop using the test lead if the outer jacket is
               damaged and the inner metal or color jacket is
exposed.
 
CAUTION
●
SettheFunctionSwitchtoanappropriateposition
beforestartingmeasurement.
 
●
Firmlyinsertthetestleads.
 
●
Disconnectthetestleadsfromtheinstrumentfor
currentmeasurement.
 
●
         Do not expose the instrument to the direct sun,
hightemperatureandhumidityordewfall.
 
●
       Altitude 2000m or less. Appropriate operating
temperatureiswithin0
℃
and40
℃
.
●
   This instrument isn
         t dust & water proofed. Keep
awayfromdustandwater.
●
       Be sure to power off the instrument after use.
     Whentheinstrumentwill notbein usefora long
   period, place it in storage after removing the
batteries.
●
              Use a cloth dipped in water or neutraldetergent
             for cleaning the instrument. Do not use abrasives
orsolvents.
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
 greatermomentary energy,so a measuringinstrument
   designedforCATIII environmentscanendure greater
momentaryenergythanonedesignedforCATII.
O 
         :Circuits which are not directly connected
tothemainspowersupply.
CAT II 
       :Electrical circuits of equipment connected
toanACelectricaloutletbyapowercord.
CAT III 
       :Primary electrical circuits of the
       equipment connected directly to the
         distribution panel, and feeders from the
distributionpaneltooutlets.
CAT IV 
             :The circuit from the service drop to the
           service entrance, and to the power meter
andprimaryover-currentprotectiondevice
(distributionpanel).
3. Specification
3-1. Measuring range & accuracy
(accuracyguaranteedat23
℃ ±
5
℃
.humidity45
〜
85%)
ACCurrent600A,1000AFunction
Function Measuring
Range Accuracy
 600A 0-600.0A
±
1.5%rdg
±
5dgt
(50/60Hz)
±
3.5%rdg
±
8dgt
(40-400Hz)
 1000A 0-1000A
DCCurrent600A,1000AFunction
Function Measuring
Range Accuracy
600A
0-600.0A
±
1.5%rdg
±
5dgt
1000A
0-1000A
ACVoltageFunction
(
Auto-ranging,Inputimpedance: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)
DCVoltageFunction
(
Auto-ranging,Inputimpedance:approx.10M
Ω)
Range Measuring
Range Accuracy
600mV/6/
60/600V 0-600.0V
±
1.0%rdg
±
3dgt
Resistance
(
Continuity/DiodeCheck
)
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
 ContBuzzer 0-600.0
Ω
Thresholdvalue:60
Ω±
30
Ω
 Diode Testvoltage: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%
(Pulsewidth/Pulseperiod)
±
2.5%rdg
±
5dgt
Note:Measurableinputsare:40Vrms@ACVor
60Arms@AC600A,350A@AC1000ARange
3-2. General Specification
●
Modeofoperation
 
:
Δ
∑mode
●
 Display 
 
:max.6039counts
     
(Frequency:9999)&Bargraph
●
          Over-range indication : "OL" displayed when exceeding
                                                 the measuring range. (except for AC/DCV and 1000A
Function)
●
 Rangeswitching :
 
Auto-ranging/Voltage,ResistanceRange
 
Singlerange/Continuity,Diodecheckand
DUTY
●
Samplerate
  
:threetimespersecond
●
Functionalconstruction:
 
OFF/ACA/DCA/ACV/DCV/
Ω
●
   Keys  :
 
SELECT(AC/DCswitching&/
Ω
   / / ),REL
Δ
,
 
Hz/DUTY,MIN/MAX,HOLD/BackLight
●
 Powersource :DC3V/R03(UM-4)x2pcs
●
Lowbatterywarning
:
 " "markisdisplayedat
 
   
2.4V
±
0.15Vorless.
●
      Temperature & humidity : 23
℃ ±
5
℃
   , relative humidity
accuracyguaranteed85%orless(nocondensation)
●
Operatingtemperature:0
〜
40
℃
,relativehumidity
 
&humidityrange85%orless(nocondensation)
●
 Storagetemperature :-20
〜
60
℃
,relativehumidity
 
&humidityrange85%orless(nocondensation)
●
Currentconsumption:approx.12mA
●
SleepFunction:Automaticallypoweredoffinabout
 
15minafterthelastFunctionswitchoperation.
 
               Press any key or rotate the Function Switch from
OFFtoanypositiontoexitfromtheSleepstate.
●
Locationforuse
Outdooruse,Altitudeupto2000m
●
ApplicableStandards
 
IEC61010-1,61010-2-032,61010-2-033
 
MeasurementCATIV600VPollutiondegree2
 
IEC61010-031
 
EMC
:
EN61326-1
 ・
EN55022
 ・
EN61000-4-2(performancecriterionB)
 ・
EN61000-4-3(performancecriterionB)
●
RoHS
:
EN50581
●
OverloadProtection
 
 CurrentRange :1200AAC/DC/10sec
 
 VoltageRange :720VAC/DC/10sec
 
 ResistanceRange :600VAC/DC/10sec
●
WithstandVoltage
 
6720VAC
(
TRMS50/60Hz
)
/5sec
 
(betweenJawsandelectricalcircuit/betweeninternal
 
circuitandenclosure)
●
InsulationResistance:10M
Ω
ormore/1000V
 (
betweenelectricalcircuitandenclosure
)
●
Conductorsize
 
approx.40mm
●
Dimension
 
approx.254(L)
×
82(W)
×
36(D)mm
●
Weight:approx.:310g
●
Accessories
 
 
 TestLeads Model7066A/1set
 
BatteryR03
(
UM-4
)
/2pcs
 
InstructionmanualEnglish,Japanese/1pce
 
CarriyngCaseModel9094/1pcs
3-3. Function Keys
The"
●
"markshowsavailablefunctionateachRange.
DCCurrentMeasurement
   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 thedisplayis clearwithout  "
BATT
 " mark,
             showing, battery voltage is enough. When the display
   is blank or
 
 "
BATT
          "  mark is indicated, replace the
batteriesaccordingtoSection7,BatteryReplacement.
 
CAUTION
   The Sleep feature automatically powers the
   instrumentoffinabout 15minafterthe lastswitch
or key operation. Therefore, the display may be
blankevenwiththeFunctionSwitchsettoaposition
    other than  "
OFF
           ". To operate the instrument in this
              case, turn the switch back to the  "
OFF
  "  position,
thentoanyotherposition,orpressanykey.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
measurementmode,
       and the Data hold function is disabled. Otherwise,
desiredmeasurementcannotbemade.
5. Measurement
5-1. AC Current Measurement
 
DANGER
●
       Never make measurement on a circuit in which
       voltage over AC600V exists to avoid getting
electricalshock.
●
           Transformer jaw tips are designed not to short
              the circuit under test. If equipment under test has
exposedconductiveparts,however,extraprecaution
       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
currentmeasurement.
●
               Keep yourfingersand handsbehindthe barrieron
theinstrumentduringameasurement.
   (1)Set the Function Switch to "
600A
   " or "
1000A
"
position.
AChasbeenselectedbydefault;presstheSELECT
                 key, when DC has been selected, to change it to
           AC.AC mark isdisplayed at theupper left onthe
display.
(2)Pressthetriggertoopenthetransformerjawsand
clampthemontotheoneconductorundertest,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
Rangeand350AormoreatAC1000Arange.
 
CAUTION
●
       Max conductor size for KEW2055 is approx
         dia. 40mm. During current measurement, keep
             the trans former jaws fully closed. Other wise,
accuratemeasurementscannotbetaken.
5-2. DC Current Measurement
 
DANGER
●
        Never make measurement on a circuit in which
     voltage over DC600V exists to avoid getting
electricalshock.
●
DonotmakemeasurementwiththeBatteryCover
removed.
●
Keepyourfingersandhandsbehindthebarrieron
theinstrumentduringameasurement.
   (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
changeittoDC.
       DC mark is displayed at the upper left on the
display.
Barrier
O: Device which is 
     not directly 
     connected to the 
     mains power supply
Protectivefingerguard(Barrier)
:
        It is a part providing protection against electrical
     shock and ensuring the minimum required air and
creepagedistances.
Cap
:
UncappedconditionforCATIIenvironment
CappedconditionforCATIII/IVenvironments
TheCapshuldbefirmlyattachedtotheprobes.
       Whenthe instrument and the testlead are combined
andusedtogether,whicheverlowercategoryeitherof
thembelongstowillbeapplied.
Cap
Protective fingerguard