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

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

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

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

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

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

CAP

EXTECHINSTRUMENTS

EX850-en-GB_v2.4 7/16

TypeKTemperatureMeasurements



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

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

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

EXTECHINSTRUMENTS

EX850-en-GB_v2.4 7/16

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



 

Table of contents

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