Kyoritsu Electrical Instruments Works, Ltd. 4200 User manual

MODEL4200
DIGITALEARTHCLAMPTESTER
INSTRUCTIONMANUAL
KYORITSUELECTRICALINSTRUMENTS
WORKS，LTD.

Contents
1.Safetywarnings .....................................................................................1
2.Features ................................................................................................3
3.Specification ..........................................................................................4
4.Instrumentlayout ...................................................................................6
5.Measurementprinciple ..........................................................................7
6.Preparationformeasurement ................................................................9
7.Measuringmethod ...............................................................................10
7-1Normalmeasurementofcurrent......................................................11
7-2MeasurementofBalanceleakagecurrent ......................................11
7-3Measurementofearthresistance ...................................................12
8.Otherfunctions ....................................................................................14
8-1Autopower-offfunction ..................................................................14
8-2 Dataholdfunction............................................................................14
8-3 Buzzerfunction................................................................................14
8-4 Backlightfunction ............................................................................14
8-5 Memoryfunction ..............................................................................15
9.Batteryreplacement ............................................................................16
10.Service ................................................................................................17

― 1 ―
1.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procedureswhichhavetobeobservedtoensuresafe
operationoftheinstrumentandmaintainitinasafecondition.
Thus,theseoperatinginstructionshavetobereadpriorto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.
¡Besuretousetheinstrumentonlyinitsintendedapplications.
¡Theinstrumentistobeusedonlyinitsintendedapplications.
¡Understandandfollowallthesafety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.
○Followingsymbolsareusedontheinstrument.Attentionshouldbepaidtoeach
symboltoensureyoursafety.
Thissymbolindicatesthattheusermustrefertotheexplanationsinthe
instructionmanual.
FThissymbolindicatesthattheinstrumentisprotectedbydoubleorreinforced
insulation.
Thissymbolindicatesthatthisinstrumentcanclamponbareconductors.
〜ThissymbolindicatesAC.

DANGER
¡Nevermakemeasurementonacircuitinwhichtheelectricalpotential exceeds
AC300V.
¡Donotmakemeasurement when thunder is rumbling.Stopmeasurementand
takeofftheinstrumentfromtheobjectundertest.
¡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.
¡Toavoidelectricalshockbytouchingtheequipmentundertestorits
surroundings,besuretowearinsulatedprotectivegear.
¡Transformerjawsaremadeofmetalandtheirtipsarenotcompletelyinsulated.
Beespeciallycarefulaboutthepossibleshortingwheretheequipmentundertest
hasexposedmetalparts.
¡Neverattempttousetheinstrumentifitssurfaceoryourhandarewet.
¡Donotexceedthemaximumallowableinputofanymeasuringrange.
¡Donotmeasureacurrentover30A.Transformerjawsmayheattocauseafire
or deformation of molding parts, which will degrade insulation.When clamping
theconductorsonwhichover30Aflowingand" "isdisplayedontheLCD,
stopmeasurementimmediately and takeofftheinstrumentfrom the conductor
undertest.
¡NeveropentheBatterycoverduringameasurement.
¡Whenthetransformerjawsareworntothewearline(seethefigurebelow),stop
theuseoftheinstrument.
WARNING
¡Neverattempttomakeanymeasurementifanyabnormalconditions,suchasa
brokencoverorexposedmetalpartsarepresentontheinstrument.
¡Donotinstallsubstitutepartsormakeanymodificationtotheinstrument.Return
theinstrument toyourlocaldistributor fromwhoyou purchasedthisinstrument
forrepairorre-calibration.
¡Donottrytoreplacethebatteriesifthesurfaceoftheinstrumentiswet.
¡Alwaysturn offtheinstrument beforeopeningthe Batterycoverforbattery
replacement.
¡AlwaysbesuretokeepyourfingersandhandsbehindtheSafetybarrier.
(seethefigurebelow)Otherwise,usermaybeexposedtothedangerof
electricalshock.
CAUTION
¡PresstheFunctionbuttonandconfirmtheappropriatefunctionisselectedbefore
startingameasurement.
¡Donotexposetheinstrumenttothedirectsun,hightemperaturesandhumidity
ordew.
¡PressthePowerbuttonandturn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.
¡Takesufficient carenottoapplyshocksuchasdrop.Otherwise,precisely
adjustedTransformerjawswillbedamaged.
¡BecarefulnottopinchsomeforeignsubstanceswiththeTransformerjawtips.
― 2 ―

― 3 ―
2.Features
Thisinstrumentisadigitalclamp-onearthresistancetester,anditisusedinmulti-
earthed systems. Can measure the earth resistance by simply clamping around
theearthedwires.
Thisinstrumentalsoequips AC current function to measure current up to 30A
sametoourtraditionalleakageclampmeters.
¡Widemeasuringrange(Auto-ranging)
Earthresistance Max.1200Ω Min.resolution0.01Ω
ACcurrent Max.30A Min.resolution0.1mA
¡Noisecheckfunction
Afunctiontodetectcurrent,whicheffectsonanearthresistancemeasurement
anddisplaytheNOISEmarkontheLCD.
¡TrueRMS
AccuratetrueRMSreadingsofACcurrentwithdistortedwaveform.
¡Autopower-offfunction
Afunction to prevent the instrument from beingleftturned on and conserve
batterypower.
¡Dataholdfunction
Afunctiontofreezethemeasuredvalueonthedisplay.
¡Buzzerfunction
Afunctiontogiveaudiblewarningtotheuserwhenthemeasurementresultis
10Ω orless.
¡Backlightfunction
Afunctiontofacilitateworkingatdimlylitareas.
¡Memoryfunction
Afunctiontosaveanddisplaythemeasurementresult.
¡Designedtofollowingsafetystandard.
IEC61010-1:2001(CAT.IV300VPollutiondegree2),IEC61010-2-032:2002
¡ThisinstrumentisprotectedbydoubleorreinforcedinsulationF.

― 4 ―
3.Specification
¡Measuringrangeandaccuracy
*Crestfactor≦2.5Accuracyatsinewave+1%(50Hz/60Hz,peakvalueshallnotexceed60A)
*Inthefollowingcases,zerowillbedisplayedontheLCD.
At20Ω rangeofEarthresistancefunction:0.04Ω orless
*Arangeshiftstoupperrangewhentheinputexceeds105%oftheselectedrange,andshifts
tothelowerrangewhentheinputfallsunder80%ofthelowerrange.
¡Operatingsystem Earthresistancefunction:Constantvoltageinjection,
Currentdetection,
(Frequency:Approx.2400Hz)
DualIntegration
ACcurrentfunction:SuccessiveApproximation(True-RMS)
¡Display Liquidcrystaldisplaywithamaximumcountof2099
¡Over-rangeindication "OL"isdisplayedwheninputexceedstheupperlimit
ofameasuringrange
¡Responsetime Earthresistancefunction:Approx.7seconds
ACcurrentfunction :Approx.2seconds
¡Samplerate Approx.oncepersecond
¡Locationforuse Altitude2000morless,Indoor/outdooruse
¡IPprotectiondegree IP40
¡Temperature& 23℃±5℃/Relativehumidity85%orless
humidityrange （nocondensation）
(guaranteedaccuracy)
¡Operatingtemperature& -10℃〜40℃/Relativehumidity85%orless
humidityrange (nocondensation)
¡Storagetemperature& -20℃〜60℃/Relativehumidity85%orless
humidityrange （withoutbatteries,nocondensation）
¡Powersource DC6V:R6P (sizeAAmanganesebattery)x4pcs,or
LR6 (sizeAAalkalinebattery)x4pcs
¡Currentconsumption Approx.50mA(max.100mA)
¡Measurementtime Approx.12hours(whenR6Pisused),
Approx.24hours(whenLR6isused)
¡Autopower-off Turnspoweroffabout10minutesafterthelast
buttonoperation.
Function
Earthresistance
(Auto-ranging)
ACcurrent(ACA)
(sinewave)
(50Hz/60Hz)
(Auto-ranging)
Range
20Ω
Resolution
Measuringrange Accuracy
0.01Ω
0.00〜 20.99 Ω ±1.5%±0.05 Ω
200Ω 0.1Ω 16.0〜99.9
Ω ±2%±0.5 Ω
100.0〜209.9 Ω ±3%±2 Ω
1Ω
1200Ω
10Ω
160
〜 399 Ω ±5%±5 Ω
400 〜 599 Ω ±10%±10 Ω
600 〜 1260 Ω −
100mA 0.1mA 0.0〜104.9mA ±2%±0.7mA
1000mA 1mA 80〜1049mA
10A 0.01A 0.80〜10.49A ±2%
30A 0.1A 8.0〜31.5A

― 5 ―
¡Applicablestandards IEC61010-1:2001(CAT.IV300VPollutiondegree2)
IEC61010-2-032:2002
IEC61326:2000(EMCstandard)
¡Electrostaticdischarge PerformancecriteriaB
immunity
¡Withstandvoltage AC5320Vrms/5seconds
BetweentheTransformerjawsfittedpartsandCase
enclosure(exceptforjaws)
¡Insulationresistance 50MΩ ormoreat1000V
BetweentheTransformerjawsfittedpartsandCase
enclosure(exceptforjaws)
¡Conductorsize Approx.32mmindiametermax.
¡Dimension 246(L)x120(W)x54(D)mm
¡Weight Approx.780g(includingbatteries)
¡Accessories BatteryR6P :4pcs
Instructionmanual :1pce
Resistorforoperationcheck :1pce
(MODEL8304)
HardcaseMODEL9128 :1pce
<Supplementalremarks>
○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:
Sinewave:CF=1.414 Squarewavewitha1:9dutyratio:CF=3

― 6 ―
4.Instrumentlayout
¡MarkstobedisplayedontheLCD
1
2
63
4
5
7
8
9
11
10
¡Nameofeachpartsandbuttons
1Transformer jaw
2 Trigger
3Backlight button
Switcheson/offthebacklight.
4Function button
SwitchesACA/Earth resistance
function.
5Memory mode button
Check the measured value with
eachdatanumber.
6Data hold button
Holdstheindicatedvalue.
Releasetheheldvalue.
7Power button
Turnson/offtheinstrument.
8Display unit (LCD)
9Cursor button (UP)
Selectsdatanumber;tosavethe
measured value, or to view the
measureddatainmemory.
10Cursor button (DOWN)
Selects data number; to save the
measuredvalue,ortoviewthe
measureddatainmemory.
11Save button
Savesthemeasuredvalue.
Displayedwhensavingthemeasuredvalueorwhen
instrumentisinmemorymode.
Displayedwhenbatteriesareexhausted.
Displayed at Earth resistance function when
Transformerjawsarenotproperlyclosed.
DisplayedatEarthresistancefunctionwhencurrentor
noise,whicheffectonthemeasuredvalue,presents.
Displayedwhendataholdfunctionisactivated.
DisplayedwhenACAfunctionisselected.
Displayedwheninstrumentis in continuity modeat
Earthresistancefunction.
Datanumber
1to100
Measuredvalue Unit

R
x
R
1
R
2
R
n
― 7 ―
5.Measurementprinciple
Thisinstrumentcanmeasuretheearthresistancetoearthinmulti-earthed
system.
Let'sregardearthresistanceundertestasRx,andtheotherearthresistancesas
R1,R2,…Rn.
Oftheseearthresistances,R1,R2,…Rncanbeconsideredthattheyare
connectedinparallel.
AndcanberegardedasacombinedresistanceRs.TheRscanberegardedsmall
enoughagainstRxsinceacombinedresistanceconsistsofseveralresistances.
Followingisanequivalentcircuitdiagramofthiscircuit.
∑
=
=
n
1i
Ri
1
1
Rs
R
x
R
1
R
2
R
n
R
x
R
s

Earthed electrode
under test
Auxiliary earth spikes
Measurement example using M4102A
― 8 ―
ByapplyingtheVoltage(V)tothecircuitfromtheTransformerjaw(CT1),currentI
is(shallbeflowed)flowedcorrespondingtotheearthresistance.Rcanbeputout
bythecalculationafterdetectingthecurrentwiththeotherTransformerjaw(CT2).
Inthiscase,R displayed in this instrument can be regarded asRx because Rs
canberegardedsmallenoughagainstRx.
RsRxR
I
V
+==
∑
=
= 〉〉
n
1i
Ri
1
1
RsRx
Rx
I
V
=
R
x
CT1
CT2
R
s
I
V
CAUTION
Thisinstrumentcannotsupportthemeasurementforthelocationswith
followingearthsystems.
¡Single-earththatisnotconnectedtootherearths.(Lightning rod,etc.)
¡Earthonwhichacurrentover2AismeasuredatACcurrentfunctionofthis
instrument.
¡Earthwithalargerearthresistancethananearthresistanceoftesting.
¡Earthwithearthresistanceover1200Ω.
Precisionmeasurement shall be performed with ourEarth resistance tester:
M4102AorM4105Aforthemeasurementofsingle-earthedwire.

― 9 ―
6.Preparationformeasurement
(1)Checkthebatteryvoltage
WhennothingisdisplayedontheLCD,pressthepowerbutton andturn
ontheinstrument.Batteryvoltageisenoughwhenindicationisclearandthe
" "markisnotdisplayedontheLCDafterturningontheinstrument.
Followthe procedure described in 9. Battery replacementand replace
thebatterieswithnewonewhenanyoffollowingsymptomsisnoted.
Otherwise,accuratemeasurementandpropersavingcannotbeensured.
*" "markisbeingdisplayed.
*indicationsarefaintanddifficulttoread.
*nothingisdisplayedontheLCD.
(2)Verifythecorrectmeasurementofearthresistance
Clamp-on the supplied resistor for operation check (MODEL8304) as shown
below,and verifythatthe Transformerjawand thecircuitworks correctly.
Whentheindicatedvalueiswithintherangedescribedbelow,theyare
operatingcorrectly. If the indicated value is greatly exceeding the accuracy,
sendtheinstrumentforrepairaccordingto"10. Service".
Forrepair,the resistor for operation check (MODEL8304) shall be attached
andreturnedtogetherwiththeinstrument.
CAUTION
Thisinstrumentperformsself-calibrationforabout3secondswhenitisturned
on.(" " is displayed ontheLCD.) Do not clamponto any conductoror
openthejawsinthisperiod.Otherwise,inaccuratemeasurementmayoccur.
Resistor for operation check
1Ω loo
p
10Ω loo
p
1
Ω
1
0
Ω
1
Ω
1
0
Ω
Resistorforoperationcheck
1Ω
10Ω
Allowablerange
0.93〜 1.07
9.75〜 10.25

― 10 ―
7.Measuringmethod
DANGER
¡Nevermakemeasurementonacircuit inwhichtheelectricalpotential
exceedsAC300V.
¡Transformerjawsaremade ofmetalandtheirtipsarenotcompletely
insulated.Beespeciallycarefulaboutthepossibleshortingwherethe
equipmentundertesthasexposedmetalparts.
¡NevermakemeasurementwiththeBatterycoverremoved.
¡Donotmeasureacurrentover30A.Transformerjawsmayheattocausea
fireor deformation of molding parts, which will degrade insulation.When
clampingtheconductorsonwhichover30Aflowingand" "isdisplayed
ontheLCD, stop measurement immediately and take off theinstrument
fromtheconductorundertest.
CAUTION
¡Takesufficientcarenottoapplyshock,vibrationorexcessiveforcetothe
jawtips.
Otherwise,preciselyadjustedTransformerjawswillbedamaged.
¡Thisinstrument performs self-calibrationforabout 3 secondswhenit is
turnedon.(" "isdisplayedontheLCD.)Donotclampontoany
conductororopenthejawsinthisperiod.Otherwise,inaccurate
measurementmayoccur.
¡Whenforeignsubstancesarestuckinthejawtipsortheycannotproperly
engage,theTransformerjawsdonotfullyclose.Insuchacase,donot
releasethejawtriggerabruptlyorattempttoclosetheTransformerjawsby
applyingexternalforce.Makesurethatthejawsclosebythemselvesafter
removingtheforeignsubstanceormakingthemfreetomove.
¡Thesizeofaconductorcanbe testedis30mmindiameter.Accurate
measurementcannotbemadeonaconductorlargerthanthis,becausethe
Transformerjawscannotfullyclose.
Neverattempttoapplyexcessiveforcetoclosethejaws.
¡Whenmeasuring large current, the Transformer jawsmaybuzz.This has
noeffectontheinstrument'sperformanceorsafety.
¡SensitiveTransformerjawsare used for this instrument. Because of the
characteristicsofTransformerjaws,whichcanbeopenedandclosed,itis
impossibletoeliminatetheinterferenceofexternalmagneticfield
completely.Iftherearesomething,whichgeneratinglargemagneticfield,at
anearby site, current value can be displayed. ("0" cannotbe displayed.)
Beforeclampingontheconductor.Forsuchacase,pleaseusethe
instrumentatalocationfarfromthething,whichgeneratingmagneticfield.
Followingarethetypicalthingsgeneratingmagneticfield.
*Conductorfedlargecurrent
*Motor
*Equipmentwhichhasmagnet
*Integratingwattmeter

― 11 ―
7-1 Normal measurement of current
*PresstheFunctionbutton andselecttheACAfunction.
*Confirmthedisplayedunitis"mA ",andthe"MEM "markisnotdisplayedat
theupperleftontheLCD.
*Pressthetriggerto open the Transformerjaws,andclose them over one
conductoronly.
*MeasuredcurrentvalueisdisplayedontheLCD.
(Earthleakagecurrentthatflowsthroughanearthedwirecanbemeasuredby
thismethod.)
7-2 Measurement of Balance leakage current
*PresstheFunctionbutton andselecttheACAfunction.
*Confirmthedisplayedunitis"mA ",andthe"MEM "markisnotdisplayedat
theupperleft ontheLCD.
*Clampontoallconductorsexceptanearthedwire.
*MeasuredcurrentvalueisdisplayedontheLCD.
L
o
a
d
Load Load
Single-phase2-wiresystem
In3-wiresystemwithneutral,
clampontoall3wires.
Three-phase3-wiresystem
In4-wiresystemwithneutral,
clampontoall4wires.

― 12 ―
CAUTION
¡Followtheproceduredescribedin"7-1 Normal measurement of current"
andmeasurethecurrentflowingontheearthedwirepriortothe
measurementofearthresistance.
Incasethatthe" "markisdisplayedattheupperrightoftheLCD,it
meansthatagreaterrorwouldbeincludedinthemeasuredresult.Toavoid
such inaccurate measurement, reduce the current flowing on the earthed
wirebyturningoffthedevicefromwhichcurrentisappliedtotheearthed
lineundertest.
¡Measurementcannot be made for theearthwithoutmulti-earth system or
whentheearthresistanceundertestissmallerthantheotherearth
resistances.
¡Toavoidinaccuratereadingmaybetaken,nevermakeameasurementfor
thesameearthsystemwithmanyofthisinstruments.
¡The" "markmaybedisplayedduringameasurementofearth
resistance.Itindicatesthatthejaws ofthe instrumentare notproperly
closed.Measurementisbeingstoppedwhilethismarkisdisplayedonthe
LCD.ClosetheTransformerjawsproperlytore-startthemeasurement.
¡TheresponsetimeatEarthresistancefunctionisabout7sec.Takereading
afteritbecomesstable.
7-3 Measurement of earth resistance
¡Measurementprocedure
*PresstheFunctionbutton andselecttheEarthresistancefunction.
*Confirmthedisplayedunitis"Ω "and"MEM "isnotdisplayedattheupper
leftontheLCD.
*Pressthetrigger toopen theTransformerjaws,andclosethemoverthe
earthedwireundertest.
*MeasuredresistancevalueisdisplayedontheLCD.
<Noisecheckfunction>
AttheEarthresistancefunction,the" "markisdisplayedontheLCDin
thefollowingcaseswhichmayeffectonameasurement.
*Thecurrentflowingontheearthedwireisexceedingthefollowingvalue.
*Thecurrentflowing ontheearthedwireincludesaharmonicwavewhich
effectsonthemeasurement.
<Jawscheckfunction>
The" "markisdisplayedwhentheTransformerjawsoftheinstrumentare
notproperlyclosed.
MeasurementisbeingstoppedwhilethismarkisdisplayedontheLCD.
RangeofEarthresistancefunction
20Ω
200Ω/1200Ω
Allowablecurrentvalue
2Aorless
400mAorless

Earth resistance measurement of a pole earthing electrode.
R
x
R
1
R
n
R
x
― 13 ―
PE
Gas
Water
Lighting Earthing
R
x
R
1
R
2
R
3
R
x
Earthing
conductor
R
1
R
n
R
x
Earth resistance measurement of an earthing electrode in a lightning protection system.
Earth resistance measurement of an earthing electrode in a street lighting system.
LightningEarthing

― 14 ―
8.Otherfunctions
8-1 Auto power-off function
Thisisafunctiontopreventtheinstrumentfrombeingleftturnedonand
conservebatterypower.Theinstrumentautomaticallyturnsoffabout10
minutesafterthelastbuttonoperation.
Toreturntothenormalmode,pressthePowerbutton againandturnson
theinstrument.
◇Thebuzzersoundsbeforetheinstrumentturnsoff.
◇Todisabletheautopower-offfunction,followtheprocedurebelow.
(1)Turnontheinstrument bypressing thePower buttonwiththeDatahold
button pressed.ThenreleasethePowerbutton.TheDataholdbutton
shallbebeingpresseddown.
(2)The instrumentis turned on, and " " is displayed on the LCD for
about1second.
Now,theautopower-offfunctionisdisabled.
Toenabletheautopower-offfunctionagain,turnoffandontheinstrument
withoutpressingtheDataholdbutton.
8-2 Data hold function
Thisisafunctiontofreezetheindicatedvalueonthedisplay.WhentheData
holdbutton is pressed once,theindicated value ontheLCD is heldeven
thoughcurrentundertestvaries.
The" "markisshownattheupperrightontheLCD.ToexittheDatahold
mode,presstheDataholdbuttonagain.(" "markdisappears.)
◇WhentheAutopower-offfunctionworkswhiletheinstrumentisintheData
holdmode,dataholdiscancelled.
8-3 Buzzer function
Thisis a function to giveaudiblewarningto user when the measuredearth
resistance is 10Ω or less. To enable the buzzer function, press the Function
button attheearthresistancefunctionatleast2seconds.(The" "mark
isdisplayedatthelowerleftontheLCD.)
Buzzersoundswhenthemeasuredearthresistanceis10Ω orless.
Todisablethebuzzerfunction,presstheFunctionbuttonagain.
(Then,the" "markdisappears.)
8-4 Backlight function
ThisisafunctiontoviewtheindicationsontheLCDindimlylitareas.
Toswitchonthebacklight,presstheBacklightbutton whiletheinstrument
turnedon.
Toswitchoffthebacklight,presstheBacklightbuttonagain.
◇Backlightisautomaticallyswitchedoffinabout1minutetoconservebattery
power.

― 15 ―
8-5 Memory function
Thisisafunctiontosaveanddisplaythemeasurementresults.
¡Saving the measurement results
(1)Anydata number (between 1and100) can be selected with the Cursor
button or atACAorEarthresistancefunction,andsavethe
measurementresults.
◇WhentheCursorbuttonisbeingpressed,thenumberswitchesquickly.
(2)Tosavethemeasurementresult being displayed on theLCD,press the
Savebutton .Thentheresultissavedtotheselecteddatanumber.
("MEM "markisdisplayedforabout1second.)
◇Aftersaving the data, data number automatically switches to the next
availabledatanumber(presentdatanumber+1)andthenextmeasured
valuecanbesavedtoit.
(Thedatanumberbecomes1afterthemeasurementresultissavedto
thedatanumber100.)
◇Whenthenewmeasurementresult issavedtothedatanumberon
whichthe previousmeasurementresult issaved,previous data willbe
overwritten.
◇Whensavingadatawhilethedataholdfunctionisactivated,the
readingswhichisbeingheldontheLCDwillbesaved.
¡Recalling the measurement results in memory
Toactivatethememoryfunction,presstheMemorymodebutton .
Thenthe"MEM "markisdisplayedontheLCD.
PressingtheCursorbutton or changesthedatanumberdisplayed
ontheLCD,andthemeasurementresultinmemoryisdisplayedaccordingly.
◇Todisablethememorymode,presstheMemorymodebuttonagainor
presstheFunctionbutton .(Then"MEM "markdisappears.)
◇When" "isdisplayedwithadatanumber,itmeansno
measurementresultissaved.
¡Clearing the measurement results in memory
Toclearthemeasurementresult,presstheSavebutton withthe
Memorymodebutton pressed.Themessage" "isdisplayedonthe
LCDforabout2secondsandthemeasurementresultontheselecteddata
numberiscleared.
(ThentheindicationontheLCDbecomes" ".)
◇Followtheprocedurebelowtodeletetheallmeasurementresults.
(1)PressthePowerbutton ,whentheinstrumentisoff,whilethe
MemorymodebuttonandtheSavebuttonarebeingpressed.Then
releasethePowerbuttononly.
(2)Instrumentisturnedon;" MEM "," "and" "aredisplayed
ontheLCDforabout2sec..
Nowallthestoreddataaredeleted.

― 16 ―
9.Batteryreplacement
WARNING
¡In order to avoid possible shock hazard, take off the instrument from the
conductorundertestandturnofftheinstrumentbeforetryingtoreplacethe
batteries.
CAUTION
¡Donotmixnewandoldbatteries.Neverusethedifferentkindsofbatteries
atthesametime.
¡Installbatteriesintheorientationasshowninsidethebatterycompartment,
observingcorrectpolarity.
Whenthebatteryvoltagewarningmark" "isdisplayedontheupperleft
of the LCD, replace the batteries. Note that the display blanksand " "
markisnotdisplayedifthebatteriesarecompletelyexhausted.
(1)Takeofftheinstrumentwhenameasurementisbeingperformed.
(2)Turnofftheinstrumentwhenitisatturn-on.
(3)LoosentheBatterycover-fixingscrewonthebackoftheinstrument.
ThenremovetheBatterycover.
(4)Installnewbatteries(R6PorLR6:4pcsforeach)intheorientationasshown
insidethebatterycompartment,observingcorrectpolarity
(5)PuttheBatterycoverinplaceandtightenthescrew.

― 17 ―
10.Service
Iftheinstrumentshouldfailtooperatecorrectly,returnittoyourlocaldistributor
fromwhoyoupurchasedthisinstrumentstatingtheexactnatureofthefault.
Forservice,theresistorforoperationcheck(MODEL8304)shallbeattachedand
returnedtogetherwiththeinstrument.
Beforereturningtheinstrument,makesurethat:
a)Operatinginstructionshavebeenfollowed
b)Batteryhasbeenchecked
Remember,the moreinformationwritten about thefault,the quicker itwillbe
serviced.