Extech Instruments MF100 User manual

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USERGUIDE
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AC/DCMagneticMeter
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ModelMF100
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EXTECHINSTRUMENTS
2MF100‐en‐GB_V1.79/15
Introduction
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ThankyouforselectingtheExtechInstrumentsModelMF100.Thisdeviceisshippedfullytested
andcalibratedand,withproperuse,willprovideyearsofreliableservice.Pleasevisitour
website(www.extech.com)tocheckforthelatestversionofthisUserGuide,ProductUpdates,
andCustomerSupport.
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Features
DCandACmagneticfieldmeasurements
NorthandSouthpoleindication
Automatictemperaturecompensation
ZerobuttonforDC,ACmagneticfunction
Separateprobeforremotemeasurements
Highaccuracy
AdvancedfunctionalitywithprogrammableuserSettings
Idealforavarietyoflaboratoryandfielduses
Heavyduty,compacthousingwithhard‐shellcarryingcase
Autopowerofffeatureconservesbatteryenergy
Easy‐to‐readLCDdisplaywithgreenbacklight
DataHoldandMIN‐MAXRecord‐Recallfeatures

EXTECHINSTRUMENTS
3MF100‐en‐GB_V1.79/15
Safety
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InternationalSafetySymbols
Thissymbolindicatestheusermustrefertothemanualforfurtherinformation.
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Doubleinsulation
SafetyNotes
oRemovethebatteryifthedeviceistobestoredforlongerthan60days.
oNeverdisposeofbatteriesinafire.Batteriesmayexplodeorleak.
Cautions
oReadandunderstandthisusermanualbeforeoperatingthemeter.
oIftheequipmentisusedinamannernotspecifiedbythemanufacturer,theprotection
providedbytheequipmentmaybeimpaired.

EXTECHINSTRUMENTS
4MF100‐en‐GB_V1.79/15
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5
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Description
MeterDescription
1. ProbeConnection
2. LCDDisplay
3. HOLDButton
4. POWERButton
5. RECButton
6. ZEROButton
7. MODEDC/AC/SETButton
8. Tilt‐Standandbatterycompartmentonrear
9. ResetButton
10. DC9VPowerAdapterjack
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ProbeDescription
1. ProbeSensingHead
2. ProbeHandle
3. Probecable
4. ProbeHeadCover
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1
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Fig. 1 – Meter Description
Fig. 2 – Probe Description

EXTECHINSTRUMENTS
5MF100‐en‐GB_V1.79/15
12
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4
5
DisplayDescription
1. NorthNorSouthSindication
2. Unitofmeasure
(GforGauseormTformilliTesla)
3. ACorDCfieldandresolutioninformation
4. Magneticreading
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ButtonDescription
1. POWERButton:PressandholdtopowerthemeterONorOFF
2. HOLDButton:Shortpresstofreezedisplayedreading(HOLDiconwillappear);another
shortpresstoreturntonormaloperation
3. RECButton:ShortpresstostartrecordingMAXandMINreadings.Additionalshortpresses
willscrollthroughthesavedMAXandMINreadings.Pressandholdtoexitthismode
4. MODEDC/AC/SETButton:Shortpressestoscrollthroughtheavailableunitsofmeasure
andNorth/Southmodes.LongpresstoaccesstheUserSettingsmenu
5. ZEROButton:Shortpresstozerothedisplaybeforetakingareading
ResetButton(rightsideofmeter;notpicturedbelow):Presstorestorethemetertofactory
defaultconditions.Ifthemeterbecomesunresponsiveusetheresetbuttontorestorethe
meter.
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Fig. 3 – Display Description
Fig. 4 – Button Description

EXTECHINSTRUMENTS
6MF100‐en‐GB_V1.79/15
Operation
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AC/DCMagneticFieldMeasurement
PressandholdthePOWERbuttonforatleast2secondstoswitchthemeterON.UsetheMODE
buttontoscrollthroughthefollowingscreensinsequence:
Under mT unit Under G unit
N(S) mT
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0
0
G
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0
0
AC
mT 0.0
0AC
G 0
0AC
mT
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0
0AC
N(S) G
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0
0
N(S) G 0
0
N(S) . mT0 0
0
a1
d2
c2
b2
d1
c1
a2
b1
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Eachscreenrepresentstheresolutionfortherespectiveunitofmeasure:
a1screenfor0.1mTDCresolutionmeasurements
b1screenfor0.01mTDCresolutionmeasurements
c1screenfor0.1mTACresolutionmeasurements
d1screenfor0.01mTACresolutionmeasurements
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a2screenfor1GDCresolutionmeasurements
b2screenfor0.1GDCresolutionmeasurements
c2screenfor1GACresolutionmeasurements
d2screenfor0.1GACresolutionmeasurements
Fig. 5 – Programming screens

EXTECHINSTRUMENTS
7MF100‐en‐GB_V1.79/15
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ForDCmagneticfieldmeasurements,thedisplaywillshoweithertheNorSindicator.Forthe
NorthPole,theNindicatorwillbeshown.Similarly,fortheSouthPole,theSindicatorwillbe
shown.ForACmagneticfieldmeasurements,thedisplaywillshowtheACindicator(theNorS
indicatorswillnotthenbeshown).
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Presstheprobeheadtothetestingmaterial(seeFig6).Thedisplaywillshowthemagneticfield
valuealongwiththeunitofmeasure(mT=MilliTeslaorG=Gauss)andAC,ifanACfield.
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Note:WhenthemeterispoweredON,thedisplaymayshowanon‐zerovalue(becauseof
environmentalinterference).BeforetakingameasurementpresstheZERObuttontonullthe
display.
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DataHold
Duringmeasurements,presstheHOLDbuttonandthemeasuredvaluewillbeheld(theLCDwill
displayHOLD).PresstheHOLDbuttonagaintoexitthedataholdfunction.
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DataRecording(MaximumandMinimumReading)
PresstheRECbuttontostartthedatarecordingfunction.TheLCDwilldisplayREC.PresstheREC
buttonagainandRECMAXalongwiththemaximumreadingrecordedwillappearontheLCD.
PresstheRECbuttonagaintodisplaytheminimumvalue(theLCDwilldisplayRECMIN).Toexit
thedatarecordingfunction,pressandholdtheRECbuttonfortwoseconds.Themeterwill
returntothenormalmodeofoperation.
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Note:WhenmakingDCmagneticfieldmeasurementswhiletheRECORDfunctionisactive,the
usercannotchangefromNorthtoSouthpoleorviceversa.
Fig. 6 – Touching Probe to Test Material

EXTECHINSTRUMENTS
8MF100‐en‐GB_V1.79/15
UserSettings
PressandholdtheSETbuttonfortwosecondstoentertheadvancedsettingsmode.Pressthe
SETbuttontocyclethroughthethreemainfunctions:
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POFFAutopowerOFFmanagement
CLrFactory‐onlydiagnosticfunction
UNItSelectthemagneticfieldunits(mTorG)
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Note:After7to10secondsthemeterwillreturntothenormaloperatingmode.
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(POFF)AutoPowerOFF
TheMF100usesanAutoPowerOFFutilitytoswitchthemeteroffautomaticallyinorder
toconservebatteryenergy.Thisfeaturecanbeenabledordisabled:
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IntheAdvancedSettingsmode,whentheLCDdisplaysPOFF,presstheRECbutton
UsetheZeroandModebuttonstoselectYESorNO
SelectingYESenablestheAutoPowerOFFfeature
SelectingNOdisablestheAutoPowerOFFfeature(userwillthenhavetoswitchoff
manually)
PresstheRECbuttontosavethesetting
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(UNiT)SelectingUnitsofMagneticField
IntheUserSettingsmodewhentheLCDdisplaysUNIT,presstheRECbutton
UsetheZEROorMODEbuttontoselectmTorG
SelectmTformilliTeslaunits
SelectGforGaussunits
PressRECtosavetheselection
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Factory‐onlyCLRfunction
WhenintheUserSettingsmode,withCLrdisplayed,pressRECtoskipthisstep.
Thisisafactory‐onlyutility
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ACPowerAdaptor
Thismeterisnormallypoweredbyone9Vbattery;howeveranoptional9Vpoweradaptoris
available.Whentheadaptorisused,themeterispermanentlypoweredandthepowerbuttonis
disabled.

EXTECHINSTRUMENTS
9MF100‐en‐GB_V1.79/15
FactoryDefaultReset
Ifthemeterbecomesinoperative,itcanberesettofactorydefaults.
Openthesidecompartmentand,withthemeteron,presstheresetswitch.
ThemeterwillberesetandtheUserSettingswillbeclearedandresettofactorydefaults.
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BatteryReplacement
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WhenthelowbatteryiconappearsontheLCD,thebatterymustbereplaced.Severalhoursof
accuratereadingsarestillpossibleinthiscondition;howeverbatteriesshouldbereplacedas
soonaspossible:
RemovethePhillipsscrewfromthebatterycompartmentontherearofthemeter.
Removeandsafelyplacethebatterycompartmentandscrewwheretheywillnotbe
damagedorlost.
Replacethe9Vbatteryobservingcorrectpolarity.
ReplacethebatterycompartmentcoverwiththePhillipsscrew.
Note:ThemetercanalsoobtainpowerfromtheDC9VPowerAdapter.Themeterwillbe
permanentlypoweredONwhentheadapterisused(thepowerbuttonisdisabled).

AllEUusersarelegallyboundbythebatteryordinancetoreturnallusedbatteriestocollection
pointsinthecommunityorwhereverbatteries/accumulatorsaresold!Disposalinthe
householdgarbageisprohibited!
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EXTECHINSTRUMENTS
10MF100‐en‐GB_V1.79/15
Specifications
CircuitCustomone‐chipmicroprocessorLSIcircuit
Display(LCD)Size52x38mm(2.0x1.5in.)
MeasurementUnitsmTMilliTesla
GGauss
MeasurementRange,DCmTRange1300.00mTx0.01mT
Range23,000.0mTx0.1mT
GRange13,000.0Gx0.1G
Range230,000Gx1G
MeasurementRange,ACmTRange1150.00mTx0.01mT
Range21,500.0mTx0.1mT
GRange11,500.0Gx0.1G
Range215,000Gx1G
Accuracy
At23°C+/‐5°C
DC±(5%rdg.+10dgt.)
AC±(5%rdg.+20dgt.)
FrequencyResponseACMeasurement:50Hz/60Hz
SensorHallEffectSensorwithAutoTemperatureCompensation
FieldDirectionUni‐axial
DisplaySamplingTimeApprox.1second
OperatingTemperature0to50°C(32to122°F)
OperatingHumidityLessthan85%R.H.
PowerSupply9VBattery
UniversalACadaptorsincluded
PowerConsumptionApproximately15mADC
Weight(meterandprobe)275g(9.7oz.)
DimensionsMainInstrument:198x68x30mm(7.8x2.67x1.18in.)
Probe:195x25x19mm(7.68x0.98x0.75in.)
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