Extech Instruments CG304 Manuale utente

USERGUIDE



CoatingThicknessTester

With Bluetooth®



ModelCG304

CG304-en-EU v1.1 7/14

Introduction

CongratulationsonyourpurchaseoftheExtechCG304CoatingThicknessTester.TheCG304isa

portablemeterdesignedfornon‐invasivecoatingthicknessmeasurementswithautomatic

recognitionofthematerialundertest.

Themeterusestwomeasurementmethods:magneticinduction(forferrousmetalsubstrates)

andeddycurrent(fornon‐ferrousmetalsubstrates).

TheBluetooth®featurewirelesslytransmitsmeasurementdatatoaPCforfurtheranalysisand

togeneratereportdocumentation.

Properuseandcareofthismeterwillprovidemanyyearsofreliableservice.



Description

MeterDescription

1. LCDdisplay

2. Powerkey

3. Probe

4. ARROWbuttons

Note:Batterycompartmentonrearofmeter



DisplayIconDescription

NFeNon‐ferrousmetals

FeFerrousmetals

AUTO Automaticsubstraterecognition

ForN Calibrationicons

DIRDIRECTmode

GRO1…4 GROUPModenumber

µmMicrometersunitofmeasure

milsmils=millimeters*2.54/100

mmMillimetersunitofmeasure

AVGAveragereading

MINMinimumreading

MAXMaximumreading

SDEV StandardDeviationreading

NONumberofdatapoints

Lowbattery



Note:TheunitofmeasureiconflasheswhenintheCONTINUOUSmodeofoperation.The

unitofmeasureiconisstablewhenintheSINGLEmodeofoperation.

CG304-en-EU v1.1 7/14

QuickStartInstructions

MeterPower



PressthepowerbuttontoswitchthemeterON.ThedisplaywillswitchON.Ifthedisplaydoes

notswitchON,installorreplacethebatteries.

Measurements



Usethefilmreferencesandzeroreferencemetalsubstratestolearnhowthemeteroperates

beforemovingtoaprofessionalapplication.Theroundmetalsubstrateistheferrous(magnetic)

substrateandtherectangularshapedmetalsubstrateisthenon‐ferrous(non‐magnetic)

substrate.Themeterautomaticallysensesferrousandnon‐ferroussubstrates.

1. Placeareferencefilm(250µm,forexample)ontheround,ferroussubstrate.

2. Placethespring‐loadedmetersensoragainstthereferencefilm.

3. Inthesinglemodethemeterwillemitanaudibletoneindicatingthatthemeasurement

hasbeentaken.

4. Inthecontinuousmodethedisplaywillcontinuallymeasureandupdatethedisplay

5. TheLCDwillshowthereading(250µm)atthecenterofthedisplayarea.

6. Atypicaldisplaywillalsoshowthefollowing:

NO=1(readingnumberone)onthelowerleftoftheLCD

AVG=250µm(runningaverage)onthelowerright

DIR=DIRmodeofoperationontheupperleft

Fe=FerroussubstrateontheupperrightoftheLCD



Experimentwiththeremainingreferencefilmsandthesubstratebeforeusingthemeter

professionally.

AutomaticPowerOFF

Inordertoconservebatterylife,themeterwillautomaticallyturnoffafterapproximately10

minutes.Todefeatthisfeatureusetheprogrammingmenudetailedinthenextsection(menu

parameterAUTOPOWEROFFunderOPTIONS).



DIR

AVG=250

NO=1

250

CG304-en-EU v1.1 7/14

ProgrammingMenu



Themetercanbeconfiguredandcalibratedthroughsimplebuttonpressesintheprogramming

menu.PresstheLEFTbuttontoaccessthemenuandrefertothemenu‘tree’below.Themenu

usesUP/DOWN,LEFT/RIGHTpressesfornavigationandselection.Inthetablebelowthefactory

defaultsettingsareinboldwithanasterisk.Eachparameterisexplainedindetailinthe

subsequentsections.

ToplevelSublevel1Sublevel2Notes

STATISTICALVIEW

AVG*Averageofaseriesofreadings

MIN Lowestofaseriesofreadings

MAX Highestofaseriesofreadings

NONumberofsampledreadings

SDEV Standarddeviationofaseries

OPTIONS

MeasuremodeSingle*Onereadingatatime

ContinuousContinuousmeasurements

WorkingmodeDirect*Readingsarenotstoredingroups

Group1…4Storereadingsingroups

Probeused

Auto*Meterautomaticallyselectsmode

FeFerrousmeasurementmode

NoFeNon‐ferrousmeasurementmode

Unitsettings

µm*Micrometers

milsMils=mm*2.54/100

mmMillimeters

BacklightON*Enablesbacklightoperation

OFFDisablesbacklightoperation

LCDStatistics

AVG*Averageofaseriesofreadings

MAXHighestofaseriesofreadings

MINLowestofaseriesofreadings

SDEVStandarddeviationofaseries

AutoPowerOFFEnable*Allowsautopowerofftooperate

DisableDefeatstheautopowerofffeature

LIMITLimitsettingsHighLimitHighAlarmalertsuserwhenreached

LowLimitLowAlarmalertsuserwhenreached

DeleteLimits Clearthealarmlimitvalues

DELETE

CurrentData Deletecurrentdata

AllData Deleteallstoreddata

GroupData Deletedatastoreddataplusalarmand

calibrationdata

MEASUREMENT

VIEWViewstoreddatainallgroups

CALIBRATION

Enable Allowcalibrationaccess

Disable Lockoutthecalibrationmode

DeleteZeroN Clearthezerocal.data(non‐ferrous)

DeleteZeroF Clearthezerocal.data(ferrous)

NOTE:DisabletheAutoPowerOFFfeaturebeforelengthyprogrammingtoavoidinconvenientautomatic

powerdownwhileprogramming.

CG304-en-EU v1.1 7/14

STATISTICALVIEWSMenu

1. PresstheLEFTbuttontoaccesstheprogrammingmenu

2. PresstheLEFTbuttontochooseSTATISTCALVIEW

3. UsetheUPandDOWNbuttonstoscrollthroughtheAVERAGE,MINIMUM,MAXIMUM,

NUMBEROFDATA,andSDEV(StandardDeviation)valuesforthestoredreadings.

4. ‘NODATA’willdisplayifnoreadingsareavailableforthemetertoanalyze.Storedreadings

willclearwhenthemeterpowersdownunlesstheGROUPfeatureisused(refertoGROUP

functionexplanationlaterinthissection).

5. PresstheBACKandthentheESCsoft‐keystoreturntothenormaloperatingmode.

OPTIONSMenu

1. PresstheLEFTbuttontoaccesstheprogrammingmenu

2. UsetheUP/DOWNbuttontoscrolldowntoOPTIONS

3. PressLEFTbuttontoselectOPTIONS

4. UsetheUPandDOWNbuttonstoscrolltotheMEASUREMODE,WORKINGMODE,PROBE

USED,UNITSETTINGS,BACKLIGHT,LCDSTATISTICS,ANDAUTOPOWEROFFparameters.Use

theLEFTsoft‐keytoselectthedesiredparameter.Eachparameterisdetailedbelow:

a. MeasureModes

SelectCONTINUOUSorSINGLEunderMEASUREMODESintheOPTIONSMenuusingthe

arrowbuttons.

IntheCONTINUOUSmeasurementmodethemeterdisplaysarunningaverageofreadingsas

theyaretaken.Notethattheaudiblemeasurement‘beep’isnotactiveinthismode.

IntheSINGLEmeasurementmodemeasurementsaretakenoneatatime.Singlemode

measurementreadingsareaccompaniedbyanaudibletone.

b. WorkingModes

SelectDIRECTorGROUP1,2,3,or4underWORKINGMODESintheOPTIONSMenuusing

thearrowbuttons.

InDIRECTmode,individualreadingsareloggedtomemory.Whenpowerisswitchedofforif

themeterisswitchedtoGROUPmode,allDIRECTreadingswillbecleared.However,the

statisticalanalysisdatawillremain.Thestatisticalanalysisutilitycanevaluateupto80

readings.Whenthememoryisfilled,newreadingswillreplaceoldreadings.Lastly,this

modehasitsowncalibrationandalarmlimitvalues.

InGROUPmodeeachgroupmemorycanstoreamaximumof80readingsand5statistical

values.Calibrationandalarmlimitvaluescanbeindividuallysetandstoredforeachgroup.

Whenthememoryisfilled,measurementswillcontinuetobetakenbutreadingswillno

longerlog(previouslyloggedreadingsarenotaffected);inaddition,statisticaldatawillno

longerupdate.Ifdesired,thegroupdata,statisticalvalues,calibrationdata,andalarmlimit

valuescanbedeletedusingtheprogrammingmenu.

CG304-en-EU v1.1 7/14

c. ProbeUsed

SelectAUTO,Fe,orNoFeunderPROBEUSEDintheOPTIONSMenuusingthearrowbuttons.

IntheAUTOmode,themeterautomaticallyactivatestheprobemeasurementmethod

(ferrousornon‐ferrous)basedonthemetalsubstratethatisbeingmeasured.Whenthe

probeisplacedonamagneticsubstrateitwillworkinthemagneticinductionmode.Ifthe

probeisplacedonanon‐ferrousmetalitwillworkintheeddycurrentmode.

IntheFerrous(Fe)ModetheMagneticinductionmeasurementmodeisactivated.

IntheNon‐Ferrous(NoFe)Modetheeddycurrentmeasurementmodeisactivated.

d. Unitsofmeasureselections

Selectmm,µmormilsunderUNITSETTINGintheOPTIONSMenuusingthearrowbuttons

(mm=millimeters;µm=micrometers;mils=mm*2.54/100)

e. Backlight

SelectONorOFFunderBACKLIGHTintheOPTIONSMenuusingthearrowbuttons.IfOFFis

selectedtheLCDbacklightingwillbecompletelydisabled.IfONisselected,theusercan

adjustthebrightnessofthebacklight.

f. LCDStatistics

SelectAVERAGE,MINIMUM,MAXIMUM,orSDEV(StandardDeviation)underLCDSTATISTICS

intheOPTIONSMenuusingthearrowbuttonsandtheSELECTsoft‐key.Thisselection

determineswhichstatisticisshownasdefaultontheLCDdisplay.

g. AutoPowerOFF

SelectENABLEorDISABLEunderAUTOPOWEROFFintheOPTIONSMenuusingthearrow

buttons.Whenenabled,themeterautomaticallyswitchesOFFafter10minutesofinactivity.

Whendisabled,themeterwillonlyswitchOFFwithabuttonpressorwhenthebattery

powerisweak.

h. BluetoothON/OFF

SelectONorOFFunderBluetoothintheOPTIONSMenuusingthearrowbuttons.IfOFFis

selectedtheBluetoothwillbecompletelydisabled.WhenBluetoothisONdatawillbe

automaticallysenttoPC,phone,orotherBluetoothreceivingdevice.

WhenthefirstconnectionisbeingmadethedevicemaypromptforaPINnumber.Inthis

caseentercode0000.

Note:TurnonBluetoothonlywhennecessaryasthebatterywilldrainmorequicklywith

BluetoothpoweredON.

i. Grayscalecontrast

PressLEFTbuttontoentermenumode.Usearrowbuttonstoadjustthegrayscaletodesired

contrast.

CG304-en-EU v1.1 7/14

DELETEMenu

TheDELETEmenusallowsfordeletingcurrentdata,alldata,andgroupdata.Thefollowing

parametersareavailableintheDELETEMenu:

DeleteCurrentdata:Deletescurrentreadingandupdatesthestatistics(AVG,MIN,MAX,etc.)

DeleteAlldata:Deleteallreadingandstatisticaldata.

DeleteGroupdata:Thisfunctionduplicatesthe“Deletealldata”functionwithadditional,

deletionsofHighalarm,Lowalarm,andone‐andtwo‐pointcalibrations.

1. PresstheLEFTbuttontoaccesstheprogrammingmenu.

2. UsertheDOWNARROWbuttontoscrolldowntoDELETE.

3. PressLEFTtoopentheDELETEfunction.

4. UsertheARROWkeystoscrolltoCURRENT,ALL,orGROUP.

5. PressLEFTagaintochooseCURRENT,ALL,orGROUP.

MEASUREMENTVIEWMenu

TheMeasurementViewmenuallowsforscrollingthroughthereadingsinallofthegroups.

1. PresstheLEFTbuttontoaccesstheprogrammingmenu.

2. UsertheDOWNARROWbuttontoscrolldowntoMEASUREMENTVIEW.

3. PressLEFTtoopentheMEASUREMENTVIEWparameter.

4. UsertheARROWbuttonstoscrollthroughthestoredreadings.

CALIBRATIONMenu

TheCalibrationmenuallowstheusertoenable/disablethecalibrationutility.TheCalibration

menualsoallowstheusertodeleteZerocalibrationdataforbothferrous(ZeroF)andnon‐

ferrous(ZeroN)modes.

1. PresstheLEFTbuttontoaccesstheprogrammingmenu.

2. UsetheDOWNbuttontoscrolldowntoCALIBRATION.

3. PressLEFTtoopentheCALIBRATIONparameter.

4. PressUP/DOWNtodeletezeropointofFeorNon‐Fe.

5. PressLEFTbuttonforOK

6. PressRIGHTbuttontoreturn.

MeasurementConsiderations

1. Aftercalibration,measurementsshouldmeetthepublishedaccuracyspecifications.

2. Strongmagneticfieldscanaffectthereadings.

3. Whenusingthestatisticalanalysisfunctionsforobtainingameanvalue,takeseveral

readingsofthesamemeasurementarea.Falsereadingsoroutlierscanthenberemoved

(deleted)usingtheprogrammingmenu.

4. Thefinalreadingisderivedfromastatisticalcalculationwithregardtothemeter’s

publishedaccuracyspecifications.

CG304-en-EU v1.1 7/14

Calibration

CalibrationTypes

Themeterisfactorycalibratedbeforeshipmenttothecustomer;howeverthecustomershould

performazerocalibrationandamulti‐pointcalibrationbeforeanycriticalmeasurementsare

taken.Thecalibrationoptionsarelistedbelow.Readthedescriptionforeachandselectthe

bestmatchforagivenapplication.

1. ZeroPointCalibration:Performbeforeeachmeasurementsession.

2. OnePointCalibration:Useforhighaccuracywithrepeatedtestsonaconstantcoating

thickness.

3. Multi‐PointCalibration:Useforhighaccuracywithinaknownrangeofcoatingthickness.

4. Calibrationforshot‐blastedsurfaces.

CalibrationConsiderations

Thecalibrationsamplemustcorrespondtotheproductsampleinthefollowingways:

Curvatureradius

Substratematerialproperties

Substratethickness

Sizeofmeasurementarea

Thepointatwhichthecalibrationismadeonthecalibrationsamplemustalwaysbe

identicalwiththepointofmeasurementontheproductitself,especiallyinthecaseof

cornersandedgesofsmallparts.

Toachievethehighestmeasurementaccuracy,performseveralcalibrationsinsuccession(for

zerovaluesandcalibrationfilmvalues).

Preparingforcalibration

1. Cleantheprobetip(grease,oil,metalscrap,andtheslightestimpuritywillaffect

measurementanddistortreadings).

2. SwitchthemeterON(ata4”[10cm]minimumdistancefromanymetal).

3. Readythesuppliedmetalsubstratesamplesandnecessaryfilms(suppliedcalibration

referencefilms).

4. Themeterisnowreadyforcalibration.



CG304-en-EU v1.1 7/14

Zerocalibration

1. Placethemeteronanuncoatedsectionofthematerialtobe

measuredoronthereferencesubstrateprovided.Useeither

theFerrousorNon‐Ferrousreferenceasrequiredbythe

measurementapplication.

a. Placetheprobeontheuncoatedsubstrateandwatchthe

LCDreadings.

b. Whenthereadingsappearstable,liftthemeteroffthe

substrate

c. PresstheLEFTbuttontoentermenu

d. PressUP/DOWNbuttontoselectzero‐pointcalibration.

e. PressLEFTtoenterorRIGHTtoreturntomeasurementmode.

f. PressLEFTbuttontoconfirmcalibration.

2. PressandholdtheDOWNbuttontoenterzero‐pointcalibrationofFeinmeasuringmode.

3. PressandholdUPbuttontoenterzero‐pointcalibrationofNon‐Femeasuringmode.



DeleteFeorNon‐Fezero‐point

1. PressLEFTbuttontoentermenu

2. PressUP/DOWNbuttontoselectcalibration

3. PressLEFTbuttontoentercalibration

4. PressUP/DOWNtodeletezero‐pointofFeorNon‐Fe

5. PressLEFTtoselectOK

6. PressRIGHTtoreturntonormaloperatingmode.



CG304-en-EU v1.1 7/14

nxx /





StatisticalAnalysisConsiderations

Themetercalculatesstatisticsfromamaximumof80readings(ForGroup1throughGroup4,a

maximumof400readingscanbestored).NotethatreadingscannotbestoredwheninDIRECT

mode.However,statisticsonthesereadingscanstillbecalculated.Whenthemeterispowered

offoriftheworkingmodeischanged(intheprogrammingmenu),theDIRECTmodestatistics

willbelost.Thefollowingstatisticalvaluescanbecalculated:

NO.:Numberofreadings

AVG:Averagevalue

Sdev.:Standarddeviation(squarerootofadataset’svariance)

MAX:Maximumreading

MIN:Minimumreading



StatisticalTerms

Averagevalue(x)isthesumofreadingsdividedbythenumberofreadings.



StandardDeviation(Sdev)

Thesamplestandarddeviationisastatisticthatmeasureshowthesamplevalueis

distributedaroundthesamplemean.Thestandarddeviationofasetofnumbersistheroot

meansquareofthevarianceS2



Thevarianceofalististhesquareofthestandarddeviationofthelist,thatis,theaverageof

thesquaresofthedeviationsofthenumbersinthelistfromtheirmeandividedby

the(numberofreadings‐1)



Variance:S2=)1/()( 2

nxx 

Standarddeviation:S= 2

S



NOTE:

UsetheDELETEparameterfromtheprogrammingmenuimmediatelyafteranoutlieror

erraticreadinghasbeentaken.RefertotheDeletefunctioninProgrammingMenu.



StorageCapacityOverflow



InGROUPmode,ifthestoragecapacityisexceeded,statisticswillnotbeupdated,although

measurementscanstillbemade.Ifthememoryisfull,subsequentreadingswillnotbe

includedinthestatistics.Themeter’sdisplaywillshow“FULL”(intheSINGLEmeasurement

mode).

InDIRECTmode,whenthememoryisfull,thenewestreadingwillreplacetheoldestreading

andthestatisticswillbeupdated.



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