Extech Instruments EX850 User manual

USERMANUAL
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ExtechEX850
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TrueRMS1000AmpClampMeter
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BluetoothTMandAndroidTMready
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Patented

EXTECHINSTRUMENTS
EX850-en-GB_v2.4 7/16
2
Introduction
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CongratulationsonyourpurchaseoftheExtechEX850CATIVTrueRMS1000AClampMeter.This
meterincludesaBluetoothTMmoduleandisAndroidTMready.TheEX850measurementfunctions
includeAC/DCVoltage,AC/DCCurrent,Resistance,Capacitance,Frequency,DutyCycle,DiodeTest,
Continuity,TypekthermocouplethermometerplusNon‐ContactIRTemperature.Properuseand
careofthismeterwillprovidemanyyearsofreliableservice.Visitwww.extech.comformore
information.
Safety
InternationalSafetySymbols
Thissymbol,adjacenttoanothersymbolorterminal,indicatestheusermustrefertothe
manualforfurtherinformation.
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Thissymbol,adjacenttoaterminal,indicatesthat,undernormaluse,hazardousvoltages
maybepresent
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Doubleinsulation
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SAFETYNOTES
Donotexceedthemaximumallowableinputrangeofanyfunction.
Donotapplyvoltagetometerwhenresistancefunctionisselected.
SetthefunctionswitchOFFwhenthemeterisnotinuse.
Removethebatteryifmeteristobestoredforlongerthan60days.
WARNINGS
Setfunctionswitchtotheappropriatepositionbeforemeasuring.
Whenmeasuringvoltsdonotswitchtocurrent/resistancemodes.
Donotmeasurecurrentonacircuitwhosevoltageexceeds600V.
Whenchangingrangesalwaysdisconnectthetestleadsfromthecircuitundertest.
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FunctionMaximumInput
AAC,ADC1000ADC/AC
VDC,VAC1000VDC/AC
Resistance,Capacitance,Frequency,DiodeTest250VDC/AC
TypeKTemperature 60VDC,24VAC

EXTECHINSTRUMENTS
EX850-en-GB_v2.4 7/16
3
CAUTIONS
Improperuseofthismetercancausedamage,shock,injuryordeath.Readandunderstand
thisusermanualbeforeoperatingthemeter.
Alwaysremovethetestleadsbeforereplacingthebatteryorfuses.
Inspecttheconditionofthetestleadsandthemeteritselfforanydamagebeforeoperating
themeter.Repairorreplaceanydamagebeforeuse.
Usegreatcarewhenmakingmeasurementsifthevoltagesaregreaterthan25VACrmsor
35VDC.Thesevoltagesareconsideredashockhazard.
Alwaysdischargecapacitorsandremovepowerfromthedeviceundertestbefore
performingDiode,ResistanceorContinuitytests.
Voltagechecksonelectricaloutletscanbedifficultandmisleadingbecauseofthe
uncertaintyofconnectiontotherecessedelectricalcontacts.Othermeansshouldbeused
toensurethattheterminalsarenot"live".
Iftheequipmentisusedinamannernotspecifiedbythemanufacturer,theprotection
providedbytheequipmentmaybeimpaired.
Thisdeviceisnotatoyandmustnotreachchildren’shands.Itcontainshazardousobjects
aswellassmallpartsthatthechildrencouldswallow.Incaseachildswallowsanyofthem,
pleasecontactaphysicianimmediately
Donotleavebatteriesandpackingmateriallyingaroundunattended;theycanbe
dangerousforchildreniftheyusethemastoys
Incasethedeviceisgoingtobeunusedforanextendedperiodoftime,removethe
batteriestopreventthemfromdraining
Expiredordamagedbatteriescancausecauterizationoncontactwiththeskin.Always,
therefore,usesuitablehandglovesinsuchcases
Seethatthebatteriesarenotshort‐circuited.Donotthrowbatteriesintothefire.
Donotdirectlyviewordirectthelaserpointerataneye.Lowpowervisiblelasersdonot
normallypresentahazard,butmaypresentsomepotentialforhazardifvieweddirectlyfor
extendedperiodsoftime
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EXTECHINSTRUMENTS
EX850-en-GB_v2.4 7/16
4
Description
MeterDescription
1. Currentclamp
2. Clampopeningtrigger
3. DataHoldButton
4. Mode
5. Peak
6. Range
7. DCAZero
8. MIN/MAX
9. BacklitLCDDisplay
10. Testleadinputjacks
11. IRthermometerandlaserpointer(rear)
12. BluetoothSEND/BacklightButton
13. Laserpointerbutton
14. Functionswitch
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DisplayiconsDescription
HOLDDataHold
MinussignNegativereadingdisplay
0to3999 Measurementdisplaydigits
ZEROZero
PPeakvalue
AUTOAutoRangemode
DC/ACDirect/AlternatingCurrent
MAXMaxreading
MINMinreading
Lowbattery
mVorVMilli‐voltsorVolts(Voltage)
Ω Ohms(Resistance)
AAmperes(Current)
FFarad(Capacitance)
HzHertz(Frequency)
oFandoCFahrenheitandCelsiusunits(Temperature)
n,m,µ,M,kUnitofmeasureprefixes:nano,milli,micro,mega,andkilo
)))Continuitytest
Diodetest
Laserpointer
Bluetoothactivesymbol

EXTECHINSTRUMENTS
EX850-en-GB_v2.4 7/16
5
Operation
NOTES:ReadandunderstandallWarningandCautionstatementsinthisoperationmanual
priortousingthismeter.SetthefunctionselectswitchtotheOFFpositionwhenthemeteris
notinuse.
ACCurrentMeasurements
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WARNING:Ensurethatthetestleadsaredisconnectedfromthemeterbeforemakingcurrent
clampmeasurements.
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1. SettheFunctionswitchtotheAACor
ADCrange
2. Pressthetriggertoopenthejaw.Fully
encloseonlyoneconductor.Foroptimum
results,centertheconductorinthejaw.
3. TheclampmeterLCDwilldisplaythe
reading.
DCAZERO
TheDCZerofeatureremovesoffsetvaluesand
improvesaccuracyforDCcurrent
measurements.Toperformazero,selectADC
andwithnoconductorinthejaw:
1. PresstheDCZERObuttonto
zerothedisplay.“ZERO”willappearinthedisplay.Theoffsetvalueisnowstoredandremo
vedfromallmeasurements.
2. Toviewthestoredvalue,presstheDCZERObutton.“ZERO”willflash
andthestoredvaluewillbedisplayed.
3. Toexitthismode,pressandHoldtheZERObuttonuntil“ZERO”isno
longerinthedisplay.
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AC/DCVoltageMeasurements
1. InserttheblacktestleadintothenegativeCOMterminalandtheredtest
leadintothepositiveVterminal.
2. SetthefunctionswitchtotheVACorVDCposition.
3. UsetheMODEbuttontoselectACorDCVoltage.
4. Connectthetestleadsinparalleltothecircuitundertest.
5. ReadthevoltagemeasurementontheLCDdisplay.
Correct Incorrect

EXTECHINSTRUMENTS
EX850-en-GB_v2.4 7/16
6
ResistanceMeasurements
Note:Removepowerbeforemakingresistancemeasurements
1. InserttheblacktestleadintothenegativeCOMterminalandtheredtest
leadintotheΩpositiveterminal.
2. SetthefunctionswitchtotheΩposition.
3. Touchthetestprobetipsacrossthecircuitorcomponentundertest.
4. ReadtheresistanceontheLCDdisplay.
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CapacitanceMeasurements
WARNING:Toavoidelectricshock,dischargethecapacitorundertestbefore
measuring.If“dISC”appearsinthedisplay,removeanddischargethe
capacitor.
1. SetthefunctionswitchtotheΩcapacitanceposition.
2. InserttheblacktestleadbananaplugintothenegativeCOMjack
andtheredtestleadbananaplugintotheCAPpositivejack.
3. PressMODEtozeroanystraycapacitance.
4. Touchthetestprobetipsacrossthepartundertest.
5. Readthecapacitancevalueinthedisplay.
6. Thedisplaywillindicatetheproperdecimalpointandvalue.
Note:Forverylargevaluesofcapacitancemeasurementtimecanbeseveral
minutesbeforethefinalreadingstabilizes.
FrequencyMeasurements
1. SetthefunctionswitchtotheVHzPosition.
2. PressandholdtheMODEbuttontoselecttheFrequency(Hz)
function.“kHz”willappearinthedisplay.
3. InserttheblacktestleadbananaplugintothenegativeCOMjack
andtheredtestleadbananaplugintotheHzpositivejack.
4. Touchthetestprobetipsacrossthepartundertest.
5. ReadtheFrequencyvalueonthedisplay.
6. Thedisplaywillindicatetheproperdecimalpointandvalue.
7. PressandholdtheMODEbuttonagaintoreturntothevoltagemode
Ù
CAP
Hz

EXTECHINSTRUMENTS
EX850-en-GB_v2.4 7/16
7
TypeKTemperatureMeasurements
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1. SetthefunctionswitchtotheKTempposition.
2. InserttheTemperatureProbeintothenegativeCOMandthepositive
TEMPjacks,observingpolarity.
3. TouchtheTemperatureProbetiptothedeviceundertest.Continueto
touchthepartundertestwiththeprobeuntilthereadingstabilizes.
4. Readthetemperatureonthedisplay.Thedigitalreadingwillindicatethe
properdecimalpointandvalue.
WARNING:Toavoidelectricshock,besurethethermocoupleprobehasbeen
removedbeforechangingtoanothermeasurementfunction.
Note:Openinputsortemperatureover‐rangescause“OL”displayandbeep.
Note:Seethe“TemperatureUnits”paragraphtoselect°For°C
Note:Thetemperaturerangeofthesuppliedthermocoupleprobeis‐20to
250°C(‐4to482°F)
ContinuityMeasurements
1. InserttheblacktestleadintothenegativeCOMterminalandtheredtestleadintotheΩ
positiveterminal.
2. Setthefunctionswitchtothe)))position.
3. UsetheMODEbuttontoselectcontinuity))).Thedisplayiconswillchangewhenthe
MODEbuttonispressed.
4. Touchthetestprobetipsacrossthecircuitorcomponentundertest.
5. Iftheresistanceis<40Ω,atonewillsound.
DiodeTest
1. InserttheblacktestleadbananaplugintothenegativeCOMjackandtheredtest
leadbananaplugintothepositivejack
2. Turnthefunctionswitchtoposition.UsetheMODEbuttontoselectthediodefunction
ifnecessary(diodesymbolwillappearontheLCDwheninDiodetestmode)
3. Touchthetestprobetipstothediodeorsemiconductorjunctionundertest.Notethe
meterreading
4. Reversethetestleadpolaritybyreversingtheredandblackleads.Notethisreading
5. Thediodeorjunctioncanbeevaluatedasfollows:
Ifonereadingdisplaysavalue(typically0.400Vto0.900V)andtheotherreading
displaysOL,thediodeisgood.
IfbothreadingsdisplayOLthedeviceisopen.
Ifbothreadingsareverysmallor‘0’,thedeviceisshorted.

EXTECHINSTRUMENTS
EX850-en-GB_v2.4 7/16
8
Non‐ContactInfraRedTemperatureMeasurements
1. SetthefunctionswitchtotheIRTempposition.
2. Aimtheinfraredsensor(rearofthemeter)atthe
surfacetobemeasured.
3. Pressthebuttoninthecenteroftherotaryfunction
switchtoturnonthelaserpointerandidentifythe
surfacespottobemeasured.
4. Theareaofthesurfacetobemeasuredmustbelarger
thanthespotsizeasdeterminedbythedistanceto
spotsizespecification.
5. Readthetemperatureinthedisplay.
Note:Seethe“TemperatureUnits”paragraphtoselectoForoC

WARNING:Donotdirectlyviewordirectthelaserpointerataneye.Lowpowervisiblelasersdo
notnormallypresentahazard,butmaypresentsomepotentialforhazardifvieweddirectlyfor
extendedperiodsoftime.
IRSpottoDistanceDiagram
The8:1spottodistanceratiodeterminesthesizeofthemeasuredsurfaceareawithrespecttothe
distancethemeterisheldawayfromthesurface.








IRMeasurementNotes
1. Theobjectundertestshouldbelargerthanthespot(target)sizecalculatedbythefieldofview
diagram.
2. Ifthesurfaceoftheobjectundertestiscoveredwithfrost,oil,grime,etc.,cleanbeforetaking
measurements.
3. Ifanobject'ssurfaceishighlyreflective,applymaskingtapeorflatblackpainttothesurface
beforemeasuring.
4. Themetermaynotmakeaccuratemeasurementsthroughtransparentsurfacessuchasglass.
5. Steam,dust,smoke,etc.canobscuremeasurements.
6. Tofindahotspot,aimthemeteroutsidetheareaofinterestthenscanacross(inanupand
downmotion)untilthehotspotislocated.
10cm
1.25cm
20cm
2.5cm
60cm
7.5cm
Distance to object
Diameter of spot

EXTECHINSTRUMENTS
EX850-en-GB_v2.4 7/16
9
DataHold
TofreezetheLCDreading,presstheHOLDbutton.Whiledataholdisactive,theHOLDicon
appearsontheLCD.PresstheHOLDbuttonagaintoreturntonormaloperation.
PeakHold
ThePeakHoldfunctioncapturesthepeakACorDCvoltageorcurrent.Themetercancapture
negativeorpositivepeaksasfastas1millisecondinduration.
1. TurnthefunctionswitchtotheAorVposition.
2. UsetheMODEbuttontoselectACorDC
3. Allowtimeforthedisplaytostabilize.
4. PressandHoldthePEAKbuttonuntil“CAL”appearsinthedisplay.Thisprocedurewillzero
therangeselected.
5. PressthePEAKbutton,Pmaxwilldisplay.
6. Thedisplaywillupdateeachtimeahigherpositivepeakoccurs.
7. PressthePEAKbuttonagain,Pminwilldisplay.Thedisplaywillnowupdateandindicate
thelowestnegativepeak.
8. Toreturntonormaloperation,pressandholdthePEAKbuttonuntilthePminorPmax
indicatorswitchesoff.
Note:IftheFunctionswitchpositionischangedafteracalibrationthePeakHoldcalibration
mustberepeatedforthenewfunctionselected.
MAX/MIN
1. PresstheMAX/MINkeytoactivatetheMAX/MINrecordingmode.Thedisplayicon"MAX"
willappear.Themeterwilldisplayandholdthemaximumreadingandwillupdateonly
whenanew“max”occurs.
2. PresstheMAX/MINkeyandthedisplayicon"MIN"willappear.Themeterwilldisplayand
holdtheminimumreadingandwillupdateonlywhenanew“min”occurs
3. PresstheMAX/MINkeyandablinking“MAXMIN”willappear.Themeterwilldisplaythe
presentreading,butwillcontinuetoupdateandstorethemaxandminreadings.
4. ToexitMAX/MINmodepressandholdtheMAX/MINkeyfor2seconds.
TemperatureUnits(˚F/˚C)
Thetemperatureunitselectionswitchislocatedinthebattery
compartment.Tochangetheunits,removethebatterydoor,liftoutthe
batteryandsettheswitchforthedesiredunits.

LCDBacklightButton 
TheLCDisequippedwithbacklightingforeasierviewing,especiallyin
dimlylitareas.Pressthebacklightbuttontoturnthebacklighton.Pressagaintoturnthebacklight
off.
Units Switch
FC

EXTECHINSTRUMENTS
EX850-en-GB_v2.4 7/16
10
AutomaticPowerOFF
Inordertoconservebatterylife,themeterwillautomaticallyturnoffafterapproximately10
minutes.Toturnthemeteronagain,turnthefunctionswitchtotheOFFpositionandthentothe
desiredfunctionposition.
BluetoothTMCommunication
ThemeterincludesaBluetoothmodule.EnabletheEX850Bluetoothbypressingandholdingthe
sideBluetoothSEND/Backlightbuttonfortwoseconds.OnthesecondbeeptheBluetoothiconwill
appearinthedisplay.
AndroidTMApplication
TheEX850meterisAndroidready.FollowthestepsbelowtoobtaintheAndroidapplication
ExViewTMEX850andtoconnecttothemeterwithanAndroiddevice.

1. ObtainandinstalltheAndroidExViewTMEX850applicationfromtheGooglePlayStore.
2. PerformasearchtoobtaintheEX850fromthelistofavailabledevices.
3. PairthemeterwiththeAndroiddevice(tabletorphone)inSettingsunderBluetooth.Use
code1234topairtheEX850totheAndroiddevice.
4. StarttheExViewTMEX850application,tapCONNECTiconandthepairedlistwillappear.
TapontheEX850meterfromthepairedlist.
5. TheupperleftcorneroftheAppshouldindicatethattheEX850isnowconnected.
ThemeterwillbegincommunicatingandMeterreadingswillappearontheAndroiddevice.
6. Theusercanselectthemeter’smeasurementmodedirectlyfromtheiconsshownonthe
bottomrowoftheAndroiddevice(V,A,mA,A,etc.).Simplytapthedesiredmeasurement
parametertoviewthereadings.Refertothescreenshotsbelow.
Note:Ifseveralmetersaretobeused,besuretonotetheuniqueaddressofeachmeterto
quicklydiscernwhichmeterisdisplayingatanygiventime.
AndroidApplicationScreenShotExamples


ACCurrent



ACVoltage
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 