Extech Instruments GRT350 User manual

UserManual

EarthResistanceandResistivityTester



ModelGRT350

AdditionalUserManualTranslationsavailableatwww.extech.com

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GRT350‐en‐GB_v1.312/16

Introduction

ThankyouforselectingtheExtechInstrumentsModelGRT350EarthResistanceandResistivity

Tester.TheGRT350hasbeendesignedandtestedaccordingtotheIECPublication348,safety

requirementsforElectronicMeasuringApparatus,EN61010‐1,EN61326‐1,EN61557‐1,EN

61557‐5andothersafetystandards.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,ProductRegistration,and

CustomerSupport.



Features

Microprocessorcontrolledwithadvancedsafetyfeatures

TwolineLCDdisplay

Auto‐Ranging

Earthresistancetestingwiththreeranges:0‐20Ω/0‐200Ω/0‐2kΩ

Earthvoltagemeasuringrangeof0‐300Vac

AutomaticC(current)spikecheck.

AutomaticP(potential)spikecheck.

2‐wiretest

3‐wiretest

4‐wiretest

EarthResistivity(Wenner–4terminal)

Autopoweroff

Lowbatteryindicator

Datahold

200memorylocationstosavetestdata

Safetystandard:EN61010‐1CATIV300V,EN61326‐1



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GRT350‐en‐GB_v1.312/16

SafetyInformation



Readtheallsafetyinformationcarefullybeforeattemptingtooperatethemeter.



Usethemeteronlyasspecifiedinthismanual.Otherwise,theprotectionprovidedbythe

metermaybeimpaired.



Ratedenvironmentalconditions:

Indoor&outdooruse

InstallationCategoryIV300V

PollutionDegree2

Altitudeupto2000m

RelativeHumidity80%maximum

Ambienttemperature0‐40°C



ObservetheInternationalElectricalSymbolslistedbelow:

Doubleinsulation

Thissymbol,adjacenttoaterminal,indicatesthat,undernormaluse,hazardous

voltagesmaybepresent

Thissymbol,adjacenttoanothersymbolorterminal,indicatestheusermustrefer

tothemanualforfurtherinformation.

Earth(ground)terminal

 EquipmentcomplieswithcurrentEUdirectives

WARNING

Toavoidelectricalshock,donottouchtheterminalsduringtests

NeverapplyVoltagehigherthan300VacrossP1andP2terminals

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11 12 13

MeterDescription



1.C1terminal(Blacktestleadconnection)

2.P1terminal(Greentestleadconnection)

3.P2terminal(Yellowtestleadconnection)

4.C2terminal(Redtestleadconnection)

5Display

6.RcLED

7.RpLED

8.Savebutton

9.Cursorbuttons

10. Cursorbuttons

11.ESCbutton

12.Powerbutton

13.TEST/STOPbutton

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GRT350‐en‐GB_v1.312/16

Operation

BatteryVoltagecheck

Pressthe"ON/OFF"button,if"BatteryLow"appearsonthedisplay,replacethebatteries.

EarthVoltagemeasurement



1. Connectthetestleadsasshownbelow.

MAX.

AC 300V

P2C2

C1P1

EES



(1) Earthelectrode(rod)undertest(2)Testspike

2. Pressthe"ON/OFF"buttonandwaitfor“SelectFunction”toappearonthedisplay.

3. Pressthe"►"button3timesandwaitfor"ACV"toappearonthedisplay.

4. Pressthe"TEST/STOP"button.

5. Theearthvoltagewillappearonthedisplayifitispresent.

6. PressSAVEtosavethemeasurementinLogmemory.

7. PressESCtoreturntothe“SelectFunction”display.

MeasurementConsiderations

Two‐terminaltestingofearthresistanceisappropriateformostgeneralpurposetestingin

normallyconductivesoil.However,two‐terminalmeasurementsincludetestleadandcontact

resistanceinthemeasurementandtheresultwillbeareadingslightlyhigherthanthetrueearth

resistance.

Whenmeasuredresultsarehigherthandesiredorifmeasurementdirectivesrequiremulti‐

terminaltechniques,switchtothe3or4terminaltechniquesasneeded.

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GRT350‐en‐GB_v1.312/16

EarthResistancemeasurement

Note:Themeasuredresultsmaybeinfluencedbyinductiveorcapacitivecouplingifthetest

leadsaretwistedoradjacenttoeachother.

WhenconnectingtheProbes,keeptheleadsseparated.

Setup

InsertthePotentialelectrodes(P)andtheCurrentelectrodes(C)asdeepaspossibleintothe

soil.Thedistancebetweenelectrodesmustbe5to10m(16to32’).



Four‐terminalearthresistancemeasurements

MAX.

AC 300V

EES

(1)Earthelectrode(rod)undertest(2)Potentialspike(3)Currentspike



Three‐terminalearthresistancemeasurements

MAX.

AC 300V

HSEES

(1)Earthelectrode(rod)undertest(2)Potentialspike(3)Currentspike



Two‐terminalearthresistancemeasurements

MAX.

AC 300V

P2C2

C1P1

EES

(1)Earthelectrode(rod)undertest(2)Potentialspike

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Testing

1. Connectthetestleadsfor2,3or4terminalEarthResistancetesting.

P1=Greenlead,C1=Blacklead,P2=Yellowlead,C2=Redlead

2. PresstheON/OFFbuttonandwaitforthe“SelectFunction”screentoappear.

8. Pressthe"►"buttontoselect"2P","3P"or"4P"dependingonthetest.

3. Press"TEST/STOP"buttontobeginthetest.

4. Themeterwillbeepwhilethetestisinprogress(forapproximately10seconds)andthen

thereadingwillappearonthelowerlineofthedisplay.

5. PressSAVEtosavetheresultsinLogmemory.

6. PressESCtoreturntothe“SelectFunction”display.



Notesfor"Rc"&"Rp"LEDindications:

Rc:Notestcurrentoutput.Checktheconnectionsandsettings.

Rp:IfRpisonandthedisplayindicates“>2kΩ”,theearthresistanceisgreaterthan2000Ω.

EarthResistivityTesting(ρ)(Wenner4‐pointmethod)

Insertthefourelectrodesatequaldistances(andinastraightline)atanintervalof1to30m(3.3

to32.3’)apart.Thedepthshouldbe5%(orless)thedistancebetweentheelectrodes.



Forexample:ifthedistancebetweentheelectrodesis5m(16’),theelectrodesshouldbe

insertedtoadepthof25cm(10”).(500cmx5%=25cm)

NOTE:Thelengthcanbesetbetween1and50m(3.3’and164’).



1. Connectthetestleadsfor4terminaltesting.

7. PresstheON/OFFbuttonandwaitforthe“SelectFunction”screentoappear.

2. Pressthe"►"buttonandselect"Resistivity".

3. Press"TEST/STOP"button.Thesettinglengthwilldisplayonthescreen.

4. Pressthe"►"or"◄"arrowbuttonstosetthecountupordown.

5. Press"TEST/STOP"buttontobeginthetest.

6. PressSAVEtosavetheresultsinLogmemory.

7. PressESCtoreturntothe“SelectFunction”display.







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GRT350‐en‐GB_v1.312/16

SaveFunction

Themeterpermitssavingmeasurementsinupto200memorylocations.

Whenatesthascompleted,presstheSAVEbuttontostorethemeasureddata.



Thedisplaywillshowthelocationnumberofthesaveddata.“SAVE###”



LOGDisplay

1. PresstheON/OFFbuttonandwaitforthe“SelectFunction”screentoappear.

2. Pressthe“►”buttonandselect“LOGDisplay”.

3. Pressthe“TEST/STOP”button.Thelognumberwilldisplayonthescreen.

4. Pressthe"►"or"◄"arrowbuttontoscrollthroughthesaveddata.

5. PressESCtogetbacktothe“SelectFunction”display.



LOGClear

1. PresstheON/OFFbuttonandwaitforthe“SelectFunction”screentoappear.

2. Pressthe“►”buttonandselect“LOGClear”

3. Pressthe“TEST/STOP”button.“Areyousure?”willdisplayonthescreen.

4. Pressthe“TEST/STOP”buttontoclearthelogdata.“Successful!”willdisplayonthe

screen.

5. Pressthe“TEST/STOP”buttontoverifythatthedatalogisclear.“NoLogdata”will

displayonthescreen.

6. PressESCtogetbacktothe“SelectFunction”display.

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GRT350‐en‐GB_v1.312/16

Maintenance

1. Rearcover

2. Batterycompartment

3. Fuse



FuseReplacement

1. Disconnectthetestleadsfromtheinstrument.

2. Removetherearcoverbyremovingthetwoscrews.

3. Removeandreplacethefusewithanewoneofthesamevalueandsize

0.5A/500V,(5x20mm).

4. Replaceandsecuretherearcover.



Batteryreplacement

When“BatteryLow”appearsonthedisplay,replacethebatteries.

1. Disconnectthetestleadsfromtheinstrumentandremovetherearcoverandthe

batteries.

2. Replacewitheight1.5VAAbatteries,takingcaretoobservecorrectpolarity.

3. Reinstallbatteryholderandbatterycover.



Neverdisposeofusedbatteriesorrechargeablebatteriesinhouseholdwaste.

Asconsumers,usersarelegallyrequiredtotakeusedbatteriestoappropriatecollection

sites,theretailstorewherethebatterieswerepurchased,orwhereverbatteriesaresold.

Disposal:Donotdisposeofthisinstrumentinhouseholdwaste.Theuserisobligatedto

takeend‐of‐lifedevicestoadesignatedcollectionpointforthedisposalofelectricaland

electronicequipment.

Cleaning

WARNING:Toavoidelectricalshockordamagetothemeter,donotallowwaterinsidethe

case.

Periodicallywipethecasewithadampclothanddetergent,donotuseabrasivesorsolvents.

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GRT350‐en‐GB_v1.312/16

Specifications

EarthResistanceRangesRanges:0‐20Ω,0‐200Ω,0‐2kΩ 

Accuracy:±(2%rdg+3dgt)

EarthResistanceResolution0‐20Ω:0.01Ω

0‐200Ω:0.1Ω

0‐2kΩ:1Ω

EarthVoltageRange:0‐300VAC(50/60Hz)

Accuracy:±(2%rdg+3dgt)

EarthResistivityRanges(ρ)

(ρ=2πLR)

L=distancebetweenprobes

R=resistance

0.06‐6.28kΩ.m

0.62‐62.8kΩ.m

6.28‐628kΩ.m

TestFrequency820Hz

TestCurrent2mA

DataMemory200manuallocations

TestleadlengthsGreenlead5m(16ft)

Blacklead10m(32ft)

Yellowlead10m(32ft)

Redlead15m(49ft)

Temperature&HumidityOperating:0to50°C(32to122°F);≦80%R.H.

Storage:‐10to60°C(14to140°F);≦80%R.H.

Altitude2000m(6500’)max

PowerSource1.5V(AA)x8batteries

Dimensions250(L)x190(W)x110(D)mm(9.84x7.5x4.33”)

WeightApprox.1430g(batteriesinstalled)

Fuse500mA/500V(5x20mm)fastblow,ceramictype

SafetyStandardsCATIV‐300V,EN61010‐1,EN61326‐1,EN61557‐1,EN61557‐5

Allrightsreservedincludingtherightofreproductioninwholeorinpartinanyform

ISO‐9001Certified

www.extech.com

www. .com information@itm.com1.800.561.8187

Table of contents

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