MEGOHMMETER 6501 6503In conformity with WEEE 2002/96/EC 1.2 Definition of Measurement Categories CAT II: For measurements performed on circuits directly connected to the electrical

MEGOHMMETER 65016503

User Manual

99 Washington Street Melrose, MA 02176 Phone 781-665-1400Toll Free 1-800-517-8431

Visit us at www.TestEquipmentDepot.com

Statement of Compliance

Chauvin Arnoux®, Inc. d.b.a. AEMC® Instruments certifies that this instrument has been calibrated using standards and instruments traceable to international standards.

We guarantee that at the time of shipping your instrument has met its published specifications.

An NIST traceable certificate may be requested at the time of purchase, or obtained by returning the instrument to our repair and calibration facility, for a nominal charge.

The recommended calibration interval for this instrument is 12 months and begins on the date of receipt by the customer.

Serial #: ________________________________

Catalog #: 2126.51 / 2126.52

Model #: 6501/ 6503

Please fill in the appropriate date as indicated:

Date Received: _________________________________

Date Calibration Due: _______________________

Chauvin Arnoux®, Inc. d.b.a AEMC® Instruments

Table of Contents

1. INTRODUCTION ........................................................... 3

1.1 International Electrical Symbols ......................................41.2 DefinitionofMeasurementCategories ............................41.3 ReceivingYourShipment ................................................51.4 OrderingInformation .......................................................5

1.4.1 AccessoriesandReplacementParts ................. 5

2. PRODUCT FEATURES .................................................. 6

2.1 Description ......................................................................62.2 Features ..........................................................................62.3 Model6501ControlFeatures .........................................82.4 Model6503ControlFeatures .........................................9

3. SPECIFICATIONS ....................................................... 10

4. OPERATION ................................................................ 12

4.1 Auto-ranging .................................................................124.2 SafetyCheck-VoltageTest ..........................................124.3 InsulationResistanceTesting(MΩRange) ...................12

4.3.1 TestVoltage ......................................................134.3.2 SpotTesting ......................................................134.3.3 RatioTesting .....................................................14

4.4 SuccessfulInsulationResistanceTesting .....................144.5 UtilizationoftheGuardTerminal(Model6503) ................... 15

4.6 InsulationMeasurement-Connections ........................174.7 InsulationResistanceonMotors ...................................21

5. MAINTENANCE .......................................................... 24

5.1 Warning ........................................................................245.2 Cleaning ........................................................................245.3 FuseReplacement ........................................................25

MegohmmeterModels6501/6503 3

CHAPTER 1

INTRODUCTION

Warning

Thesesafetywarningsareprovidedtoensurethesafetyofpersonnelandproperoperationoftheinstrument.• Readtheinstructionmanualcompletelyandfollowall

safetyinformationbeforeoperatingthisinstrument.• Safetyistheresponsibilityoftheoperator!• Testsaretobecarriedoutonlyondeadcircuits!Check

forlivecircuitsbeforemakingresistancemeasure-ments(safetycheck).

• Thesemegohmmetersareratedfor600VCATIIor300VCATIII-PollutionDegree2.

• TheMegohmmeterModels6501/6503aresourcesofhighvoltage,asisthesampleconnectedtothem.Allpersonsperformingorassistinginthetestsmustemployallsafetyprecautionstopreventelectricalshocktothemselvesandtoothers.

• AEMC®Instrumentsconsiderstheuseofrubberglovestobeanexcellentsafetypracticeeveniftheequipmentisproperlyoperatedandcorrectlygrounded.

• Whentestingcapacitancesamples,makesurethattheyhavebeenproperlydischargedandthattheyaresafetotouch.Dielectricinsulationsamplesshouldbeshort-circuitedforatleastfivetimestheamountoftimetheywereenergized.

• Usetheleadssuppliedwiththemegohmmeter.Ifdefectiveorused,replacebeforetesting.

4 MegohmmeterModels6501/6503

1.1 International Electrical Symbols

This symbol signifies that the instrument is protected by double or reinforced insulation.

This symbol on the instrument indicates a WARNING and that the operator must refer to the user manual for instructions before operating the instrument. In this manual, the symbol preceding instructions indicates that if the instructions are not followed, bodily injury, installation/sample and product damage may result.

Risk of electric shock. The voltage at the parts marked with this symbol may be dangerous.

In conformity with WEEE 2002/96/EC

1.2 Definition of Measurement Categories

CAT II: For measurements performed on circuits directlyconnectedtotheelectricaldistributionsystem.Examplesaremeasurements on household appliances or portabletools.

CAT III: Formeasurements performed in the building installationatthedistributionlevelsuchasonhardwiredequipmentinfixedinstallationandcircuitbreakers.

CAT IV: For measurements performed at the primary electricalsupply (<1000V)suchasonprimaryovercurrentprotec-tiondevices,ripplecontrolunits,ormeters.


1.3 Receiving Your ShipmentUponreceivingyourshipment,makesurethatthecontentsarecon-sistentwith thepacking list.Notifyyourdistributorofanymissingitems.Iftheequipmentappearstobedamaged,fileaclaimimme-diatelywiththecarrierandnotifyyourdistributoratonce,givingadetailed description of any damage. Save the damaged packingcontainertosubstantiateyourclaim.Donotuseaninstrumentthatappearstobedamaged.

1.4 Ordering Information

Megohmmeter Model 6501 .....................................Cat. #2126.51Includes a soft carrying case, two color-coded leads, two insulated alligator clips, test probe and user manual.

Megohmmeter Model 6503 .....................................Cat. #2126.52Includes a soft carrying case, three color-coded leads, three insulated alligator clips, test probe and user manual.

1.4.1 Accessories and Replacement PartsReplacement soft carrying case ................................Cat. #2126.71

Replacement leads (black and red), alligator clips (black and red) and one safety test probe (6501) ......Cat. #2126.72

Replacement leads (black, red and blue), alligator clips (black, red and blue) and one safety test probe (6503).........Cat. #2126.73

Replacement Fuse - 0.2A, 600V HPC (6501) ............Cat. #2970.95


CHAPTER 2

PRODUCT FEATURES

2.1 Description

TheAEMC® Models 6501 and 6503 are compact, self-containedhand-crankedmegohmmeters.Theyarepracticalanddependableinstrumentsdesigned forabroad rangeofplantandfieldserviceapplications,suchasacceptancetestingandpreventivemaintenanceofwiring,cables,switchgear,andmotors.Theeasyhand-crankedoperationprovidesasteadyrectifiedDCvoltageoutputacrosstheentirerangeforconsistentlyreliablereadings.

Thesemegohmmeters incorporateabuilt-ingeneratorandacon-stantDCvoltagecircuit toprovideastableoutputandgivedirectinsulationresistancereading.

TheModels6501/6503haveauniqueauto-ranging featurewhichexpands the scale by x10 and almost doubles the scale length.Whenthepointerreachesneartheendofscale,theauto-rangingfeatureactivates,returningthepointertothebeginningofthescalewiththex10redLEDindicatoron.

Insulation resistance is indicated with a rugged taut-band metermovement on a logarithmic scale. The indicator scale is easy toread.

2.2 Features

• Measures insulationat500V,resistanceandcontinuity (Model6501)

• Threetestvoltages:250V,500V,1000V(Model6503)


• Testvoltageconstantacrosstheentiremeasurementrange• AutorangingMΩ,kΩandΩranges(Model6501)• AutorangingMΩranges(Model6503)• Designedforharshenvironments:offshore,mining,heavy-duty

field,industrial,andmilitaryuse• Compact,self-containedpackage;foldingcrank• Largedirectreadingscale• 600Vtestvoltagerange(safetycheck)


2.3 Model 6501 Control Features

kΩΩ

MV

x 10

5

01 2

6 710

V

FUS

123451020

10 20 300.5

50(500V)

(1mA)(5mA)

ΜΩ

2 ! C42

300

0100 200 400 500 600Ω

κΩ 43 8 9

40

0

Ω

MEGOHMMETERModel 6501INSTRUMENTS

®

600V CAT II / 1000V CAT I !

1 2 3

4

5

6

7

8

9

Figure 2-1

1. Line(-)terminalBlack2. Fuse0.2A3. Earth(+)terminalRed4. AmberLEDilluminateswhenpropercrankspeedisattained,

indicatingpresenceofselectedoutput5. Foldawayhandle6. Mechanicalzeroadjustmentscrew7. Rangeswitch-safetytestfirstonMΩ/Vrangeto600VAC8. Autoranging:RedLEDilluminateswhenreadingneedstobe

multipliedx10toobtainthetruevalue(MΩ,kΩ,Ωranges)9. Securityfingerrestisolatesusershandfromterminalswhile

givingafirmgripduringanoperation


2.4 Model 6503 Control Features

MEGOHMMETERModel 6503INSTRUMENTS

®V500V

1kV25

0V

x 10

300

0100 200 400 500 600

V

G

20 15304050100200500

5020 10 5 4 3 2 1.5

10

1(1kV)

(250V)(500V)ΜΩ

2 ! C42

600V CAT II / 1000V CAT I !

1 2 3

4

5

6

7

8

9

Figure 2-2

1. Line(-)terminal-Black2. Guardterminal-Blue3. Earth(+)terminal-Red4. GreenLED illuminateswhenproper crank speed is attained,

indicatingpresenceofselectedtestvoltage5. Foldawayhandle6. Mechanicalzeroadjustmentscrew7. Rangeswitch-Safetytestfirston600V/V~rangeto600VAC8. Autoranging:RedLEDilluminateswhenreadingneedstobe

multipliedx10toobtainthetruevalue(MΩrange)9. Securityfingerrestisolatesusershandfromterminalswhile

givingafirmgripduringanoperation


CHAPTER 3

SPECIFICATIONS

MODELS 6501 6503ELECTRICALInsulation TestsTest Voltage 250V 500V 1000V

−0.5 to 5.5MΩ; 5.5 to 200MΩ

−

1 to 11MΩ; 11 to 500MΩ1 to 11MΩ; 11 to 500MΩ

10 to 110MΩ; 110 to 5000MΩ

Short Circuit Current

5mA (max)

Accuracy 2.5% of Scale LengthResistance TestsMeasurement Range(Auto-Ranging)

0 to 45kΩ; 45 to 500kΩ −

DC Test Current 1mA constant, 500V max −Accuracy 2.5% of Scale Length −Automatic Discharge 5s/µF 8s/µF

Continuity TestsTest Voltage 5mA constant, 10V max −Measurement Range(Auto-Ranging)

0 to 9Ω; 10 to 100Ω −

Accuracy 2.5% of Scale Length −Fuse Protection 0.2A, 600V HPC 6x32mm −Voltage Tests/Safety CheckVoltage Range 0 to 600VAC

Frequency 45 to 450HzAccuracy 3% of ScaleInput Impedance 100kΩ (approx)


MODELS 6501 6503Scale Direct reading on all ranges; 3" (76mm), black on whiteTest Voltage Indicator

Amber LED indicates propertest voltage and crank speed

NOTE: If the LED is not ON during testing, the reading is not valid

Green LED indicates propertest voltage and crank speed

NOTE: If the LED is not ON during testing, the reading is not valid

Auto-Range Indicator

Red LED indicates Auto-Range;multiply MΩ, kΩ & Ω

readings x 10

Red LED indicates Auto-Range;multiply MΩ readings x 10

Power Source Hand-cranked, heavy duty brushless alternator andsolid state rectification and amplification for stable voltage;

test voltage reached at 140rpm (approx)Meter Movement Rugged taut band suspensionMECHANICALDimensions 4.7 x 4.4 x 5.3" (120 x 111 x 135mm) with lidWeight 2.5 lbs (1.1kg)Terminals “+” Line (red); “–” earth (black);

accepts standard 4mm safety plugsENVIRONMENTALTemperature Reference Operating Range Storage Range

68 to 79°F (20 to 26°C), 30 to 50% RH14 to 113°F (-10 to 45°C), 0 to 75% RH-4 to 176°F (-20 to 80°C), 0 to 90% RH

SAFETYSealed IP54 with lid, IP52 without lidRating EN 61010-1, 600V CAT II; 300V CAT III; Pollution Degree 2Double Insulation Yes CE Mark Yes

*Specifications are subject to change without notice


CHAPTER 4

OPERATION

4.1 Auto-rangingHow it works:Whenthepointerreachesapproximately90%ofthefullscalelength,theauto-rangeistriggered,theredauto-range(x10)LEDlightsup.Thepointergoesbacktothebeginningofthescaleandresumesitstravel.Thereadingsshouldbemultipliedby10whenthex10LEDison.

4.2 Safety Check - Voltage Test Beforemeasuringinsulationresistance,confirmthatthesampleisfullydischarged(particularlyindielectricandcapacitancesamples)andthatthesampleisnotconnectedtoanenergizedcircuit.Toperformthevoltagetest,settherangeselectiontoVMΩ(Model6501) or 500V MΩ (Model 6503), connect and read on the redvoltage scale (600VACmax).DO NOT CRANK. Ifmeasuring onaDCcircuit, thepointerwilldeflectbut themeasurementmaybeinaccurate.

4.3 Insulation Resistance Testing (MΩ Range)Afterchecking fora livecircuit (seesafetycheck),select the testvoltageandconnectthemegohmmeter.Severalconnectionexam-plesare illustrated further.Crank thehandleuntil theAmberLED(Model6501)orGreenLED(Model6503)ontheupperright-handsidelights,ensuringthattheselectedtestvoltagehasbeenreached.


4.3.1 Test VoltageNopublishedstandardtellswhichvoltagetochooseforanygivenwinding.However, published recommendations could be summa-rizedasfollows:

Rated Voltage of Motor Test VoltageBelow 115 250V

115 250 or 500V230 500V460 500 or 1000V

4.3.2 Spot TestingAsageneralruleinspottesting,testvoltageshouldbeapplieduntilnovariationinreadingisnotedfor15secondsorappliedforafixed60seconds.Oncapacitancecircuits,crankingforuptoaminuteormoremaybenecessarytofullychargethesample.Whatminimumvalueshouldbemeasured?TheIEEEstandardN°43-2000statesthatit isimpossibletospecifythevalueofinsulationresistanceatwhichawindingwillfailelectrically,butonmotors,minimumread-ingsgenerallystatedare:

Rated Voltage R minimum 250 or less 2 MΩ

460 2 MΩ

There is no fixed figure for determiningwhat is good and bad inresistancereadings,butagoodguidewouldbe1MΩforeveryonehundredappliedoperatingvolts,asaminimumfigure.Thisappliestomotors and transformers.When the insulation resistance getsthislow,anelectricalbreak-downcanbeexpectedatanytimeandrewindingorreplacingshouldbeconsidered.It is not unusual for awinding to be 10 to 100 times the recom-mendedminimumvalue (IEEEstandard43-2000:Recommended Practice for Testing Insulation Resistance of Rotating Machinery),butthisvarieswithtemperatureandhumidity.


4.3.3 Ratio TestingIn time resistance reading (DielectricAbsorption Ratio), readingsare taken at 30 seconds and 60 seconds to obtain the dielectricabsorptionratio.

Insulationresistance@60s

Insulationresistance@30s

Thistestisusefultoincreasetheaccuracyofspottesting.Ingen-eral,aratioof1.25:2orbettershouldberequired.Aratiobelowthisindicatesthatrepairisprobablyneeded.Remember thataDC insulation testmaybeused foracceptancetesting,butismorecommonlyusedtocheckthegradualdeteriora-tionofequipmentoveritslife.Consultyourequipmentmanufacturerforspecifictestortestvoltageifnotknown.Insulationresistancedecreaseswithmoisture,temperatureandageandshouldberecordedovertimeatagiventemperatureandcor-rected.

4.4 Successful Insulation Resistance Testing• Checkwiththeequipmentmanufacturerforfactoryinsula-

tionresistancereadings.• Donotrelyoninsulationresistancetestingaloneasproof

ofwindingconditions.• Donotexpectthesamevalueforallpartsofallmachines.• Observeconsistenttesttimeduration,recognizingthat

totalcurrentthroughinsulationundertestwillvarywithtime.

• Correctallreadingsproperlytoastandardreferencetem-perature(seeIEEEstd#43-2000,Temperature Correction Curve).

• Knowwhatyouaretesting.Isolatethepieceofequipmentfromothercircuitry.

• Watchtrendsratherthanrelyingonsingle“spot”readings.

=DielectricAbsorptionratio(DAR)


4.5 Utilization of the Guard Terminal (Model 6503)

G

A

D

BC

A = InsulationB = ShieldC = ConductorD = Exposed surface

Figure 4-1

Guardterminalsareusefulwhenmeasuringhighresistancevaluesandforstabilizingreadings.Whentestingtheinsulationattheendofacable,itisnecessarytoeliminatetheerrorfromsurfaceleakagewhichoccurs,particularlyathighresistancevalues.Thepurposeoftheguardterminal istoprovideathirdterminalwithinthepathofthesurfaceleakage“D”.ConnecttheinstrumentasshowninFigure4-1.Ifthereisnoshieldat“B”,useacopperwirewoundseveraltimesaroundtheexposedsurface“B”.(Note:Ifashield isnotavailableandyoudonotmakeupa shieldaround “B”andconnect to theguardterminal(-),themeasurementwillbeerroneousandleadtoconfusionastothecable’sstate.)


If theguard terminal isnotconnectedat“B”, the instrumentmea-sures the current “I” flowing through the insulation anda surfaceleakagecurrent“i1”.SeeFigure4-2.

To EARTHterminal

I

To LINEterminal

NO CONNECTIONto Guard terminal

A

B

C

Ry

Rx

Rz

Rx: resistance through insulation

Ry: surface resistance

Rz: surface resistance

i 1

Figure 4-2

Whentheguardterminalisconnectedat“B”,theinstrumentmea-suresthecurrent“I”andnotthesurfaceleakagecurrent“i1”,whichisnot included in themeasurement.SeeFigure4-3.This typeofmeasurementwillgivethetruevalueoftheresistance“Rx”,provid-ingthe“Ry”and“Rz”arenottoolow.

To EARTHterminal

I

To LINEterminal

To Guard terminal

A

B

C

Ry

Rx

Rz

Rx: resistance through insulation

Ry: surface resistance

Rz: surface resistance

i 1

Figure 4-3


4.6 Insulation Measurement - Connections

Figures 4-4 shows the connections to measure the insulation ofone conductor to the other conductors.The cable should be dis-connectedatbothendstoavoidleakagethroughswitchboardsandpanels.For theModel6503, theconnection to theguard terminalisusedtoeliminatetheeffectsofsurfaceleakageacrossexposedinsulationatoneendofthecable.RefertothesectiononUtilizationoftheGuardTerminal(§4.5).

G

Cable Insulation

Conductor Under Test

Cable Insulation

6501

6503


Fus

Figure 4-4


Figures 4-5 shows the connections for testing insulation from asupplyconductortoground(motorframe).

Cable Insulation


Figure 4-5


Figure4-6showstheconnectionstoatransformer(lightingordis-tribution).Make sure that the switches and/or circuit breakers onbothsidesareopen.Checkthehighvoltagewindingtoground,lowvoltagetoground,andtheresistancebetweenthemwithnowindingground.

Tested Winding

TransformerGrounding Lug

Figure 4-6


Figure4-7shows theconnections formeasuring the insulationofa three-phase line togroundby connecting the jumpersbetweenphases.Thisgivesareadingofallconductorsatonce.Ifaloadsuchasamotor,heater,etc.,isattachedtotheotherendoftheline,itwillreadtheloadresistancetogroundatthesametime.Byremovingthejumpers,readingscanbemadebetweentheindividualconduc-torsandground.

~~

~ ~~~

Jumpers

Figure 4-7


4.7 Insulation Resistance on Motors

Figure4-8showsreadingtheresistancetogroundofathree-phasemotor winding. Since the three-phase motors are internally con-nected,it isonlynecessarytoconnectoneleadtothemotorleadandtheotherleadtothemotorframeasshown.

Figure 4-8


Figure4-9showsthewindingsofathree-phasemotorseparated.Sometimesthiscanbedoneattheleadterminalswhileothertimestheendbellsmustberemovedtogetattheleadwiresofthecoils.By connecting themegohmmeter as shown, thephase insulationresistancevaluecannowbedetermined.Readbetweenphases“A”and“B”,then“B”and“C”,then“C”and“A”.

A

B

C

Figure 4-9


Figure4-10showsconnectionsfortestinginsulationfromasupplyconductorinaswitchboxtoground(motorframe).Anidenticaltestmaybecarriedoutfromthemotorstarter.

Motor Side of Switch:Connection to One Leg

GroundedMotor Frame

Starter In

Figure 4-10


CHAPTER 5

MAINTENANCE

5.1 Warning

• Formaintenanceuseonlyoriginalfactoryreplacementparts.

• Toavoidelectricalshock,donotattempttoperformanyservic-ingunlessyouarequalifiedtodoso.

• Do not perform any service while the Megohmmeter Model6501/6503isonanycircuit.

• Toavoidelectricalshockand/ordamageto the instrument,donotletwaterorotherforeignagentsintotheelectronicmodule.

Warning: IfthecrankspeedLEDisnotONduringtesting,thereadingisnotvalid.

5.2 Cleaning

Themegohmmetermaybegentlycleanedwithasoftcloth,soapandwater.Dryimmediatelyaftercleaning.Avoidwaterpenetrationintotheelectronicmodule.

Makesure themegohmmeterandall leadsaredrybefore furtheruse.


5.3 Fuse Replacement

WARNING: Foryoursafety,foldthecrankanddisconnectalloftheleadsfromthemeter.

• Withaflatscrewdriveroracoin,pushandturnthefuseholderaquarterturncounter-clockwise.

• Replace the fuse with an identical one - 0.2A, 600V HPC6x32mm

05/17

99-MAN100328v8

Chauvin Arnoux®, Inc. d.b.a. AEMC® Instruments

99 Washington Street Melrose, MA 02176 Phone 781-665-1400Toll Free 1-800-517-8431

Visit us at www.TestEquipmentDepot.com

Documents

MEGOHMMETER 6501 6503In conformity with WEEE 2002/96/EC 1.2 Definition of Measurement Categories CAT II: For measurements performed on circuits directly connected to the electrical