KYORITSU KEW SNAP 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 SNAP 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.
○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.


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.
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.


4

○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


5

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.


6

*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