MITECH MFD500 User manual
1Introduction 4
1.1Featuresof theInstrument..................................................................4
1.2Specifications......................................................................................6
1.3BaseInstrument Package...................................................................6
2Understanding theKeypad,Menu SystemandDisplays 7
2.1StructureFeature................................................................................7
2.2ScreenDisplay....................................................................................8
2.3KeysandRotaryKnobFeatures.......................................................10
2.4Menusand Functions.........................................................................11
2.5AlarmLights.......................................................................................11
3InitialStart-up 13
3.1PowerSupply....................................................................................13
3.2ConnectingaProbe..........................................................................13
3.3StartingtheInstrument......................................................................14
4Operation 15
4.1AdjustingtheDisplayRange.............................................................15
4.2SettingtheMaterialVelocity..............................................................15
4.3SettingtheDisplayDelay..................................................................15
4.4SelectingProbeTestMode...............................................................16
4.5SelectingaRectificationMode..........................................................16
4.6SettingtheA-Scan Reject Level.......................................................18
4.7SettingtheGain................................................................................18
4.8Changingthe Gain-Adjustment Increment (DBSTEP).....................18
4.9AutoGainFeature.............................................................................19
4.10 ConfiguringtheGates.....................................................................19
4.11Setting theDamping Level..............................................................22
4.12 SettingthePulseEnergyLevel.......................................................22
4.13 SettingthePulseWidth...................................................................23
4.14 Adjusting thePulseRepetitionFrequency (PRF)............................23
4.15 SpecifyingtheProbeFrequency.....................................................23
4.16 SpecifyingthePiezoCrystalSize...................................................23
4.17 SettingtheProbeX-Value...............................................................23
4.18 ProbeDelayCalibration..................................................................24
4.19 SettingtheAngleof Incidence........................................................24
4.20 MagnifyingtheContentsof aGate..................................................24
4.21 FreezingtheA-Scan Display...........................................................24
4.22 SettingtheDisplayGrid..................................................................24
4.23 SelectingUnits................................................................................25
4.24 ScaleSetting...................................................................................25
4.25 Fillfunction......................................................................................25
4.26 SettingtheDisplayBrightness........................................................26
4.27 SettingtheDisplayColor................................................................26
4.28 SettingtheA-ScanColor.................................................................26
4.29 KeySound......................................................................................27
4.30 Dateand TimeSetting....................................................................27
4.31 DisplaytheSystemInformation......................................................27
4.32 ResettingtheInstrument.................................................................27
4.33 Connecting toaComputer..............................................................28
5CalibrationandMeasurement 29
5.1CalibrationwithStraight-andAngle-BeamProbes...........................29
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5.2CalibrationwithDual-Element(TR)Probes......................................30
5.3DistanceAmplitude Curve.................................................................32
5.4MeasuringwithAVG/AVG.................................................................34
5.5CurvedSurfaceCorrection...............................................................37
5.6FlawSizingFeature..........................................................................37
5.7CrackHeight MeasuringFeature......................................................38
5.8EnvelopeFunction............................................................................38
5.9PeakHoldFeature............................................................................39
5.10 B-ScanFeature...............................................................................39
5.11DataStorage...................................................................................40
6MaintenanceandCare 42
6.1Careof the Instrument......................................................................42
6.2Careof the Batteries.........................................................................42
6.3Maintenance.....................................................................................42
6.4Warranty...........................................................................................42
6.5Tipson Safety...................................................................................42
Appendix 43
AppendixA: Chargingthebattries..........................................................43
AppendixB: MenuStructure...................................................................45
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NDTzone • Non-Destructive Testing Equipment Specialists
1Introduction
TheMFD350is anadvanceddigitalultrasonicflawdetectorfeaturinga
multi-colorTFTLCD andahostofnewfeaturestomeetchallenginginspection
requirements.Itcombinespowerfulflawdetectionand measurement
capabilities,extensivedatastorage,and the abilitytotransferdetailed
inspectiondata tothe PCviaitshigh-speedUSB port.
Theinstrumentincorporatesmanyadvancedsignalprocessingfeatures
including a10MHzRFbandwidthto permit testing ofthin materials,narrowband
filterstoimprovesignaltonoiseinhighgainapplicationsand aspikepulserto
optimizepenetration onthickorhighly attenuating materials.
Theinstrumentcanbewidely usedinlocatingand sizing hidden cracks,voids,
disbands,and similardiscontinuitiesinwelds,forgings,billets,axles,shafts,
tanksand pressurevessels, turbines,andstructuralcomponents.
1.1Featuresof the Instrument
Theinstrumentextendsthe performanceandrange ofapplicationsthatare
capableofbeingsatisfiedbyaportableinstrument. Thequality,portability,
durability,and dependabilitythatyou havecometoexpectfromthe popular
MitechMFD Seriesofinstrumentsremain.
Display
Hi-resolution(320 ×240 pixels)multi-colorTFTLCD Displaywithnine
user-selectablecolordisplayschemesandbrightness controlprovideshigh
contrastviewingofthewaveformfrombright, directsunlighttocomplete
darkness.
Thehi-resolution colorLCDdisplaywithfast60Hzupdategivesan “analog
look”tothewaveformprovidingdetailedinformation thatiscriticalinmany
applicationsincludingnuclearpowerplant inspections.
Range
Upto6000mm insteel.Suitableforuseonlargeworkpiecesand in
high-resolutionmeasurements.
Pulser
PulseEnergyselectableamong Low,MediumandHigh
PulseRepetition Frequencyadjustablefrom10Hzto1KHzin1Hzincrements.
Damping selectableamong100Ω、200Ωand 400Ωforoptimumprobe
performance
Test ModesincludePulseecho, dualandthru-transmission
Receiver
Sampling：10 digitAD Converterat the samplingspeedof 160MHz
Rectification：PositiveHalfwave,NegativeHalfwave,Fullwaveand RF
AnalogBandwidth:0.5MHzto10MHzcapabilitywithselectablefrequency
ranges(automatically setbytheinstrument)tomatchprobe foroptimum
performance.
Gain：0dBto110dBadjustableinselectablesteps0.1dB,2dB,6dB,and
locked.
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Gates
Twofullyindependentgatesofferarangeofmeasurementoptionsforsignal
height ordistanceusingpeaktriggering.
Theecho-to-echomodeallowsaccurategatepositioningforsignalswhichare
extremelyclosetogether.
GateStart: Variableoverentiredisplayedrange
GateWidth:VariablefromGateStart toendofdisplayedrange
GateHeight: Variablefrom0to99%FullScreen Height
Alarms:Thresholdpositive/negative
Memory
Memoryof 100 channelfilestostorecalibrationset-ups
Memoryof 1000wavefilestostoreA-Scan patternsandinstrument settings.
Allthefilescanbestored, recalledand cleared.
Functions
lSemiautomatic twopointcalibration:Automatedcalibration oftransducer
zerooffsetand/ormaterialvelocity
lFlawLocating：LivedisplaySound-path,Projection(surfacedistance),
Depth,Amplitude,
lFlawsizing:Automatic flawsizingusing AVG/AVGorDAC, speedsreporting
ofdefect acceptanceorrejection.
lDigitalReadoutandTrig.Function:Thickness/Depthcanbedisplayedin
digitalreadoutwhenusinganormalprobe andPeampath,Surface
DistanceandDeptharedirectlydisplayedwhenangleprobe isinuse.
lBoththeDAC andtheAVGmethod of amplitudeevaluationareavailable.
lCurved SurfaceCorrection Feature
lCrackHeightMeasurefunction
lMagnifygate：spreadingof the gaterangeoverthe entirescreen width
lVideo Recordingandplay
lAuto-gainfunction
lEnvelope:SimultaneousdisplayofliveA-scanat60Hzupdaterateand
envelopeofA-scan display
lPeakHold:Comparefrozen peakwaveformstoliveA-Scanstoeasily
interpret test results.
lAScan Freeze：Displayfreezeholdswaveformandsoundpathdata
lBScan displayfeature
RealTimeClock
Theinstrument clockkeepsrunning trackingthetime.
Communication
HighspeedUSB2.0port.
TheoptionalDataProsoftwarehelpsmanageand formatstored inspection data
forhigh-speed transfertothe PC.Datacanbe printedoreasily copied and
pastedintowordprocessing filesandspreadsheetsforfurtherreportingneeds.
Newfeaturesinclude livescreen capturemodeanddatabasetracking.
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Battery
InternalrechargeableLi-ionbatterypackrated7.2Vat6600 mAh
8hoursnominaloperatingtimedepending ondisplaybrightness
8-10 hourstypicalrechargetime
Knob
Operatingadjustmentsareeasilyandquickly made using the rotaryknob.
1.2Specifications
lRange:0to6000 mm,at steelvelocity
lMaterialVelocity: 1000to9999m/s
lDisplayDelay: -20to3400 µs
lProbeDelay/ZeroOffset : 0to99.99µs
lSensitivity:110dBmaxinselectableresolution0.1,1.0,2.0,6.0dBand
locked.
lTestModes:Pulseecho,dualelement and thru-transmission
lPulseRepetitionFrequencyrangesfrom10 Hzto1000Hz
lPulseEnergy:Low,MediumandHigh
lDamping: 100,200, 400ohms
lBandwidth(amplifierbandpass ):0.5to10MHz
lGateMonitors:Twoindependent gatescontrollableoverentiresweeprange
lRectification: Positivehalfwave, negativehalfwave,fullwave, RF
lSystemLinearity:Horizontal:+/-0.2%FSW,Vertical:0.25%FSH, Amplifier
Accuracy+/-1dB.
lReject (suppression):0to80%full screen height
lUnits: Inchormillimeter
lTransducerConnections:BNC
lPowerRequirements:ACMains100-240VAC, 50-60Hz
lDimensions:263H×170W×61D mm
lOperatingTemperature: -10℃to50℃
lStorageTemperature: -30℃to50℃
1.3Base Instrument Package
PortableUltrasonicFlawDetectorwithHi-ResolutionColorLCD Display
Straight BeamTransducer(2.5MHz, Φ20)
AngleBeamTransducer(2.5MHz,13 mm×13mm, 63.5°)
Interconnect Cableforthetransducer(Q9-Q9)
RechargeableLi-Ion BatteryPackage,6.6amphour
Powersupply/chargerunit
Supportingpillar
OperatingManualinEnglish
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NDTzone • Non-Destructive Testing Equipment Specialists
2Understanding theKeypad,Menu SystemandDisplay
2.1StructureFeature
Therightfiguregivesan
overviewofthe
instrument system.
1、The MainUnit
2、Probe(Transducer)
The MainUnit
1, Belt2, LCDDisplay3, LOGO 4. Function Keys 5MenuKeys
6,AlarmLED7, PowerLED8,Keypad9,RotaryKnob
10, ProductLabel11, SupportPillarScrew12,BatteryCase
13, Poweradapterport14,BatterySwitch15, USB Socket
16, Probe CablePort(Transmit)17, Probe CablePort(Receive)
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2.2Screen Display
Theinstrument displaysaredesigned tobeeasytointerpret.
TheInstrument hasadigitalscreen forthedisplayofA-Scan.
Top figureshowsthemainscreen.
Thenamesofthemenusor
submenusaredisplayed atthe
bottomofthe screen.Theselected
menuorsubmenuis highlighted.
Indicatedatthe rightofthedisplay,
nexttotheA-Scan,arethefunctions
ofthecorresponding menu.The
displayofthe functionsdisappears
onthehomescreen.
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Themeasurementline belowthe
wavedisplayshowsvaluesofrange
settingsandmeasuredvalues.
:Amplitudeheight. : Sound path
.
: Projection. :Depth
“A61.3”meansgatemode is single;
selectedgateisgateA;and peak
echoposition:sound path61.3mm.
“AB 24.0”meansEcho-Echo
mode;
selectedgateisgateA;soundpath:
24.0mm.
Thesetting line belowthe
measurementline showsthe channel
filename,the beamangle,the
velocityand thegain.
Thestatusareaatthebottom-right
cornershowsthesystemstatus.The
followingstatuswillbeshowed:
:Indicatesthebatterycapacity
: Straightbeamprobe
:Anglebeamprobe
: Singleelement probe
: Dualelement probe
:Through-transmitmode
: Envelopefunctionon
: Peakholdfunction on
: USB online; :A-Scanfreezed
Theecho positionareaatthe
top-rightcornerindicatedshowsthe
projection andthedepthofthe peak
echo.
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2.3Keysand Rotary Knob Features
Theinstrumentisdesigned togivetheuserquickaccess toallofthe
instrument’sfunctions.Itseasy-to-usemenu systemallowsanyfunction tobe
accessedwithno morethanthree keypresses.
Toaccessanyfunction:
lPress one ofthe fivemenukeys(F1~F5)toselectamenu.The menus
across thebottomofthe displaywillimmediately bereplacedwiththe
submenuscontainedinthe selected menu.
lPressamenukey(F1~F5)againtoselectthe submenucontaining the
desiredfunction.
lUptofourfunctionswill be
displayedinthe function
baron the rightsideofthe
display.Selectthedesired
function,bypressingone
ofthefourfunctionkeys
(S1~S4).
lChangethevalue listed in
the functionboxwiththe
rotaryknob.Somevalues
can alsobeadjustedwith
repeatedlypressingthe
corresponding functionkey.
Homekeyimmediatelyreturnstheinstrument tothemainscreen
FreezekeyfreezestheA-Scan
Magnifykeyexpandsthe gaterangetofullscreen
Alarmkeyturnsthegatealarmon oroff
Forturningtheinstrument onoroff
Db-Step keyselectsthegainsubmenusorswitchthedbstep
A/B Gatekey-GatefunctionsselectinggatefunctionsandGateA/Bswitch
SpecialkeyssuchasGain,
Gate, Range,ProbeZero-Offset
Calibration,AngleCalibration,
Freeze,SaveWaveform,
Auto-Gain,Envelop,PeakHold
andetc.aregrouped together
foreasythumbcontrol.This
design allowsdirectaccessto
importantinstrumentset-up
parametersand provideseasy
andfastoperatingindifficult
inspection environments
A/B
AVG
DAC
PWR
ANGL
CAL
ALRM
AVG
DAC
REC
Ultrasonic
LOPE
FlawDetector
GAIN
AUTO ENVE PEAK
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NDTzone • Non-Destructive Testing Equipment Specialists
Range key-Range functionselecting
CAL Probe-Delaykey –ProbeDelaycalibration
ANGL Probe-Anglekeyselectstheanglecalibrationfunctions
Savekeyperformsadata-storageof theA-Scanpattern
GAIN
AUTO Auto-GainkeystartsorstopstheAuto-Gainfunction
LOPE
ENVE Envelope keyturnsthe Envelope function onand off
REC
PEAK Peak-HoldkeyturnsthePeak-Holdfunctiononandoff.
Videokeystartsorstopsrecording asegmentof the display
DAC
AVG DAC-AVGkeyselectsthe menusof DAC/AVG
searchesnextechotowardsleft, ormovethe cursortoleft when inputting
digit numbers.
searchesnextechotowardsright, ormovethe cursortorightwheninputting
digit numbers.
confirmsorswitchescurrentselection
Rotaryknob:Fordirectsetting thecurrentlyselectedfunction.Asinglekey
pressontherotaryknobwillfunctionaspressing .
2.4Menusand Functions
Theinstrumentmenusystemconsistsofseveralmenus,submenus,and
functions.Itallowstheoperatortoselectand adjustvariousfeaturesand
instrument settings.
lAvailablemenusareaccessed viatheHome Menu.Notethatthe menus
visibleonyourparticularinstrument dependon whichoptionsareinstalled.
lEachmenucontainsseveralsubmenus.
lMenusand submenusareselected bypressing thekeybelowthedesired
item(F1toF5).
lWhenasubmenuisselected,the functionscontained inthatsubmenu are
listedintheFunctionBardowntheright-handside of thedisplayscreen.
lFunctionsarethen selectedbypressingthe adjacentFunctionKey(S1to
S4).
lTurningthe FunctionKnob,andinsomecasescontinuingtopressthe
adjacentFunctionKey,willchangethe valueshowninthe selected
function’sbox.
Notethatsomefunctions,likeRANGE,havebothcoarseandfine adjustment
modes.Coarseand finemodesareselectedbypressingtheadjacentFunction
Keymorethanonce.Anicon of “”willappearon the leftofthefunction name
when thefunction isinfineadjustmentmode.When thefunctionisincoarse
adjustmentmode,turningthe functionknobwillproducelarge changesinthe
selectedfunction’svalue.Whenthefunctionisinfineadjustmentmode,turning
thefunctionknob willchangethevaluebysmalleramounts.
2.5AlarmLights
Twoalarmlightsappearatthe top-rightcornerfrontofthe instrument’skeypad.
One alarmlightismarkedasALRM,whichis assignedto the gatealarm.When
agatealarmistriggered,thislightwill illuminate.The otherlightismarked as
PWR indicatingpowerandbatterystatus.
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3InitialStart-up
3.1Power Supply
Theinstrumentcan beoperatedwithan externalpoweradapterorwith
batteries.
You canconnecttheinstrumenttothe mainssupplysystemevenifitcarries
batteries.Adischargedbatteryischargedinthiscase,viz.paralleltothe
instrument operation.
OperationUsing thePowerSupplyUnit
Connecttheinstrumenttothemainssocket-outletusingthepowersupply unit.
Theplugreceptacleisatthe topleftoftheinstrument. Pushthe plugofthe
powersupplyunitintotheplugreceptacleuntilitsnapsintoplacewithaclearly
audibleclick.ThePWRLEDon the keypadoftheinstrumentwilllightingreen
colorifthe connectionisproperlyaligned
OperationUsing Batteries
Usealithium-ion batterypackprovidedwiththe instrumentforthe battery
operation.
Thebatterycompartmentis situated attheinstrumentback.Thelidisfastened
with4attachment block.Toinsert thebatterypack
lMovethefourattachmentblockofthebatterycompartmentdownwardin
ordertoloosen them.
lLift thelidoff upward.At thebottomofthe batterycompartment, you will see
twosprings.
lInsertthebatteryintothebatterycompartment.Makesurethatthetwo
contactson the backofthebatterypackareconnectedwiththe springsin
thebatterycompartment.
lClosethe batterycompartment and fastentheattachmentblocks.
lCheckthebatteryswitchonthetopofthe instrument. Make suretoswitchit
onbeforeinternalcharging.
Note:
lThebatteryswitchonthe topoftheinstrumentmustbesettoONwhen
operatingwiththe batterypackorcharging it.
lWhennot using theinstrument,settheswitchtoOFFtosavepower.
3.2Connecting aProbe
Topreparethe instrumentforoperation,youhavetoconnectaprobetoit. The
instrument is availablewiththe probe connectorsBNC.
When connecting aprobetothe instrument, it’snotonlyimportantthatthe
probe’sphysicalconnection be properly made.It’salsoimportantthatthe
instrumentisproperly configuredtoworkwiththe installedprobe.The
Instrumentwilloperatewithoneortwosingle-elementprobesorwitha
dual-element probe.
Toinstall asingle-elementprobe,connecttheprobe cabletoeitherofthetwo
portsonthe frontofthe instrument.Whentwoprobes,oradual-elementprobe
is connected totheinstrument, the “Receive”probeconnectorshouldbe
installed intherightportandthe ‘Transmit’probeconnectorinthe leftport.
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Connect onesingleelement probetoeitherport.
Connect leadsfromaDualElement Probetobothports.
Forthrough-transmission,connecttwosingleelementprobestothetransmit
(left, labeledas )and receive(right, labeledas )ports.
3.3Starting the Instrument
Tostarttheinstrument, press theswitch-onkey .Ifitoperatesonthe internal
batterypack, makesuretoset the batteryswitchtoON position beforestarting.
Thestartdisplayoftheinstrumentappears;hereyouwill alsoseethe current
softwareversion and theserialnumberof theinstrument. Theinstrument carries
out aself-checkand then switchesovertostand-bymode.
Thesettingsofall function valuesarethesameasbeforeswitching-on ofthe
instrument.
Theinstrumentwillshutoffautomaticallywhenthe batterycapacitylevelistoo
low.
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4Operation
4.1Adjustingthe Display Range
ThefunctiongroupBASE enablesyou tomakethebasicadjustmentofthe
displayrange.Thedisplayonthescreenmustbe adjustedforthematerialtobe
testedandfortheprobe used.
Calibrationrequiresthe useofcalibrated standardmade ofthesamematerial
asthe testpiece.Priortocalibratingthe instrument/probe combination,the
A-Scan display-screenrange(thematerialthicknessvalue representedbythe
full horizontalwidthofthescreen)willnormallybesettoavalue equaltoor
slightlylargerthanthecalibratedstandard.
-Activatethe BASE submenu(locatedintheBASICmenu)bypressing
the menukeybelowit. Three functionswillappeardown the right side of
the displayscreen.
-Pressthefunction keynexttotheselectiontitled RANGE.You’llnote
thatRANGEhasbothcoarseandfineadjustmentmodes.Coarseand
finemodesareselected byrepeatedlypressing thecorresponding
functionkeynext toit.
-Tochange therange,turnthe knob.Notethatthemaximumofrange
settingis6000 mm.
-The display’shorizontalrangewillremainasset.
Range isselectableinfixed steps
orcontinuouslyvariable.
4.2Setting the Material Velocity
UseVELOCITYtosetthesoundvelocitywithinthetestobject.Alwaysensure
thatthefunctionVELOCITYiscorrectly set.Theinstrumentcalculatesallrange
and distanceindicationsonthebasisof thevalueadjusted here.
Velocityrange：1000m/s～9999m/s
Coarseadjustment, instepsasfollows:
2260m/s2730m/s3080m/s3230m/s
4700m/s5920m/s6300m/s
Fine adjustment: 1000~9999instepsof 1m/s
4.3Setting the Display Delay
Hereyoucanchoosewhethertodisplaytheadjusted range (forexample300
mm)starting fromthe surface ofthe test object, orina sectionofthe testobject
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starting atalaterpoint. Thisallowsyouto shiftthecompletescreendisplayand
consequently alsothedisplayzero.Ifthedisplayshouldforexamplestartfrom
thesurfaceofthetestobject, thevalue inD-DELAYmustbesetto0.Tosetthe
displaydelay
-Activatethe BASE submenu(locatedintheBASICmenu)bypressing
the menukeybelowit. Three functionswillappeardown the right side of
the displayscreen.
-Pressthefunction keynexttotheselectiontitled D-DELAY.
-Tochange the displaydelay, turn the knob.You’ll notethatthe displayed
echoesshifttothe leftorright.
Range:-20~3400 µs
Coarseadjustment: 10pixelspace(in µs)
Fine adjustment: 1pixelspace(in µs)
4.4Selecting ProbeTest Mode
You can use the function PRBMODEtoactivatethe pulser-receiverseparation.
Thefollowing modesareavailable:
lSINGLE-Forsingle-elementoperation( willbe displayed);the probe
connectionsocketsare connected inparallel.
lDUAL –Fortheusewithdual-element (TR)probes( will bedisplayed);
the right-handsocketisconnectedwiththe amplifierinputwhereasthe
initialpulseisavailableattheleft-hand socket.
lTHRU –Through-transmissionmodefortheusewithtwo
single-elementprobes( willbedisplayed);thereceiveris connected
withright, thepulserisconnectedwithleft.
-Activatethe RCVERsubmenu (located intheP/R menu)bypressingthe
menukeybelowit.
-Pressthefunction keynexttothe selectiontitled PRBMODE.
-Tochange the probemode,turn the knob.Eachavailableprobemodeis
represented byan iconthat’sdisplayed nearthedown-rightcornerof the
displaywheneverthatprobemodeisindicated.
-The probemodewillbe settothelastonedisplayed.
4.5Selecting aRectification Mode
You can selecttherectificationmodeofthe echopulsesaccordingtoyour
applicationinthefunction RECTIFY.
Rectificationeffectsthe orientationoftheA-Scanonthe displayscreen.The
A-Scan representsthe pulse(echo)that’sreturnedfromthe materialbeing
testedtotheinstrument. Theseriesofechoeslookslikethe RadioFrequency
(RF) signal.
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Notethat theRFsignalhasanegative
componentbelowtheaxis,and a
positive componentabovethe axis.
RFrectificationisusefulwhen
evaluatingaprobe.
RFrectificationisforbiddenwhen
displayingtheDAC/AVGcurves.
PositiveHalfRectification meansthat
only the upper(positive)halfoftheRF
signalis displayed.
NegativeHalfRectificationmeansthat
only the bottom(negative)halfofthe
RFsignalis displayed.Inthe figure
above,notethateven though it’sthe
negativehalfofthe RFsignal,it’s
displayedinthesameorientationasa
positivecomponent.Thisisonly to
simplifyviewing.Thesignaldisplayed
inthe viewidentifiedasNegative
Rectificationis the negative
componentof theRFsignal.
Full-WaveRectificationcombinesthe
positiveandnegativerectifiedsignals
together,anddisplaysbothofthemin
apositiveorientation.Full-wave
rectificationisrecommended formost
inspections.
Usethefollowing proceduretoselectarectificationmode
-Activatethe RCVERsubmenu (located intheP/R menu)bypressingthe
menukeybelowit. Three functionswillappeardown the right sideofthe
displayscreen.
-PressthefunctionkeynexttothefunctiontitledRECTIFY.You’llnote
thattherearefouroptions:
lPOS-Showsthe positivecomponentofthe RFsignal
lNEG-ShowsthenegativecomponentoftheRFsignalbutdisplays
it inapositiveorientation
lFULL-Showsthepositiveand negativehalvesoftheRFwave,but
bothareorientedinthepositivedirection.
lRF- Showsthe echo withnorectification
-Select the rectificationmethod.
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4.6Setting the A-Scan Reject Level
Thefunction REJECTallowsyoutosuppress unwantedechoindications,for
examplestructuralnoisefromyourtestobject. Toomitaportion oftheA-Scan,
you mustdefinethepercentage offull-screen heightyouwishtoomit.Youmay
omitA-Scanupto80%ofthescreenheight.ToSetarejectpercentage
-Activatethe RCVERsubmenu (located intheP/R Menu)bypressingthe
menukeybelowit.
-Pressthefunction keynexttotheselectionREJECT.
-Set therequiredpercentage valuebyturning the knob.
You shouldhandlethisfunctionwithgreatcaution,asitmayofcoursehappen
thatyou suppressechoesfromflawsaswell.Manytestspecificationsexpressly
forbidusingtherejectfunction.
4.7Setting the Gain
Instrumentgain,whichincreasesanddecreasesthe heightofadisplayed
A-Scan,isadjusted withthe gainfunctions.
Thegainis displayedas:A+B+C
dB.It includesthe basicgain,the
offsetgainandthesensitivity
correction.Themaximumofthe
totalgain(A+B+C)is110dB.
Theoffset gainisforthe purposeof flawevaluation.TheDAC/AVGcurves
remainthesamewhenadjustingtheoffset gain.
Sensitivitycorrection: Compensateforthetransferlossesinthe materialunder
test.This correctionisnecessaryif testobject andreferenceblockhave
different surfacequalities.Youhavetofindouttheadjustmentvalueforthe
compensationof transferlossesbyexperiments. Thegainisvaried accordingly
inthis correction,whilethecurveline remainsthesame. Tosetthesensitivity
correction,selectthefunction T-CORR andthen adjustitsvalueaccordingto
theexperiment.
WhenDAC is active, adjusting thebasicgainsettingwillresult inan equal
adjustmentof the DAC curveposition. Toincreasethe instrumentgainwithout
changingtheDAC curveposition, usetheT-CORR function tocompensatefor
varyingcouping/surfaceconditions.
4.8Changingthe Gain-AdjustmentIncrement (DB STEP)
Whenadjusting the A-ScanGain,eachclickoftheadjustmentknobincreases
ordecreasesthegainlevelbyadBincrementequaltothe DBSTEP.Several
valuescanbespecifiedforDBSTEP.Availableincrementsinclude: 0.1dB,1dB,
2dB,6dBand0dB.Notethatsetting theDBSTEPto0dBpreventsadjustment
of theinstrument gainandpreventsanychangesusing theknob.
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Toselectone of theexisting DBSTEPvalues:
-ActivatetheGAINsubmenu (locatedintheBASICmenu)bypressing
the menukeybelowit.
-Pressthefunction keynexttotheselectiontitled DBSTEP.
-ChangetheDBSTEPvaluebyrepeatedlypressingthecorresponding
functionkeyorbyturningtheknob.
NotethatDBSTEPvaluecanbe quicklychanged byrepeatedly pressing the
key .
4.9AutoGainFeature
UsetheAutoGainfunction toautomaticallysetthe basicgain,soastoadjust
thepeakecho toatarget height.
-Setthetargetechoheightusing the AUTOfunction located intheFUNC
submenu.
-Press GAIN
AUTO tostartthe AutoGainfunction. “AUTO-XX%”willbeshownon
the screen.
-The AutoGainfunction willend when the echo height reachesthe target
value.Oryoucanstop thefunctionbypressing GAIN
AUTO again.
4.10Configuring theGates
Thegatesmonitortherangeofthetest objectwhereyou expecttodetectaflaw.
If an echo exceedsorfallsbelowthegate,analarmsignalissentoutviathe
ALRMLED. The gate choosesthe echoforthe digitaltime-of-flightoramplitude
measurement.
Theinstrumenthastwogates:AgateandBgate.GateAand Bare
independentofoneanother.Settingthepositionandcharacteristics ofthe A-
and B-Gatesisthe firststep toconfiguring theinstrumentforflawdetectingor
material-thickness measurement. TheGATEmenucontrolsnotonlythelocation
ofthe AandB-Gates,butalso the alarmsand otherfeaturesactivated when an
A-Scan signalcrossesaspecificgate.
A-Scan signalscrossingtheAorB-Gateare evaluatedforthepurposesofflaw
detectionandmaterial-thicknessevaluation.WhenthesignalcrossestheAor
B-Gate,the maximumpoint (peak)ofthe signal(in the specificgate)isused for
evaluationpurposes.Themeasuredvalue isindicatedinthe measurement line.
SelectingaGate
Selectingagatebyusing theGATE
SELfunction.
You can alsorepeatedlypress A/B to
switchtheselected gatebetween
GateAand GateB.
Theselectedgatewill be shownin
solidline.Theunselected gatewill
beshownindashedline.
NDTzone • Non-Destructive Testing Equipment Specialists
20
PositioningGates
Usethefollowingprocedurestosetthe verticalandhorizontalposition oftheA
and B-Gates.Rememberthatgatepositionhasthefollowing effectson
instrument performance:
lA-Scanechoeson therightsideofthedisplayscreen representfeatures
thatoccuratagreaterdepthfromthetest-materialsurfacethan thoseon
theleft ofthe displayscreen.Therefore,movingagatetotherightmeans
that thegateisevaluatingadeeperportionofthetest material.
lAwidergatewillsimplyspantheequivalent ofmoretest-materialdepth
lIncreasingtheverticalheight(called threshold)ofagatemeansthatonly
reflected signalsofsufficientlylargeamplitudewillcrossthegate.
SettingaGate sStarting Point
You can fixthestartingpoint ofthegatesAorBwithinthedisplayrange.
-ActivatetheGATEsubmenu(located inthe GATEmenu).
-Select the gatetobepositionedusing the GATESELfunction.
-SelectthegateSTARTfunctionandadjustthestartingpointbyturning
the knob.Increasinganddecreasingthevalueofthestarting point
movesthegatetotheright andleft, respectively.
-The gatestartingpointwillremain asset, evenwhen width adjustmentis
made.
Coarseadjustment: 10pixelspace
Fine adjustment: 1pixelspace
When the gateexceedsthedisplay
range,asshowninrightfigure,the
measuredvaluewillbe shownas “*”
inthemeasurement line.
You canalsosettheselectedgate’sstartingpointusingtheQuikSearch
Function.QuickSearchFunctionisachievedbysimply pressingthe and .
Notethattheinstrumentwillonly searchtheechowhosepeakcrossesthe
selectedgateinthisfunction.
AdjustingaGate sWidth
You can determine the gatewidthwithinthe displayrange.
-ActivatetheGATEsubmenu(located inthe GATEmenu).
-Select the gatetobepositionedusing the GATESELfunction.
-Select the gateWIDTH function andadjust itsvalue byturningtheknob.
Coarseadjustment: 10pixelspace
Fine adjustment: 1pixelspace
NDTzone • Non-Destructive Testing Equipment Specialists
Table of contents
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