MEGOHMMETER E N G L I S H User Manual
Contents
1. Costs for repair standard calibration and calibration traceable to N I S T are avail able NOTE You must obtain CSA before returning any instrument Technical and Sales Assistance If you are experiencing any technical problems or require any assistance with the proper operation or application of your instrument please call mail fax or e mail our technical support team Chauvin Arnoux Inc d b a AEMC Instruments 200 Foxborough Boulevard Foxborough MA 02035 USA Phone 800 343 1391 508 698 2115 Fax 508 698 2118 E mail techsupport aemc com www aemc com NOTE Do not ship Instruments to our Foxborough MA address 26 Megohmmeter Models 6501 6503 Limited Warranty Models 6501 and 6503 warranted to the owner for a period of one year from the date of original purchase against defects in manufacture This limited warranty is given by AEMC Instruments not by the distributor from whom it was purchased This warranty is void ifthe unit has been tampered with abused or ifthe defect is related to service not performed by AEMC Instruments For full and detailed warranty coverage please read the Warranty Coverage Information which is attached to the Warranty Registration Card if enclosed or is available at www aemc com Please keep the Warranty Coverage Information with your records What AEMC Instruments will do If a malfunction occurs within the one year period you may return the inst2. Models 6501 6503 21 Figure 4 9 shows the windings three phase motor separated Sometimes this can be done at the lead terminals while other times the end bells must be removed to get at the lead wires of the coils By connecting the megohmmeter as shown the phase insulation resistance value can now be determined Read between phases A and B then B and C then C and A Figure 4 9 22 Megohmmeter Models 6501 6503 Figure 4 10 shows connections for testing insulation from a supply conductor in a switchbox to ground motor frame An identical test may be carried out from the motor starter Motor Side of Switch Connection to One Leg Starter In Grounded Motor Frame Figure 4 10 Megohmmeter Models 6501 6503 23 5 MAINTENANCE 5 1 Warning For maintenance use only original factory replacement parts To avoid electrical shock do not attempt to perform any servic ing unless you are qualified to do so Do not perform any service while the Megohmmeter Model 6501 6503 is on any circuit To avoid electrical shock and or damage to the instrument do not let water or other foreign agents into the electronic module Warning If the crank speed LED is not ON during testing the reading is not valid 5 2 Cleaning The megohmmeter may be gently cleaned with a soft cloth soap and water Dry immediately after cleaning Avoid water penetration
3. and Replacement Parts 5 PRODUCT 85 6 2 1 Description eee ame 6 2 2 Features 6 un AS AE e AS R AN 6 2 3 Model 6501 Control Features 8 2 4 Model 6503 Control Features 9 8 10 OPERATION 12 4 1 ii cte e 12 4 2 Safety Check Voltage 12 4 3 Insulation Resistance Testing MO Range 12 43 1 Test Voltage eiie htt 13 4 32 13 4 3 3 Ratio Testing 14 4 4 Successful Insulation Resistance Testing 14 4 5 Utilization of the Guard Terminal Model 6503 15 4 6 Insulation Measurement Connections 17 4 7 Insulation Resistance on Motors 21 5 24 331 dd a 24 5 2 24 5 3 Fuse 1 25 Repair and 26
4. with the equipment manufacturer for factory insula tion resistance readings Do not rely on insulation resistance testing alone as proof of winding conditions Do not expect the same value for all parts of all machines Observe consistent test time duration recognizing that total current through insulation under test will vary with time Correct all readings properly to a standard reference tem perature see IEEE std 4443 2000 Temperature Correction Curve Know what you are testing Isolate the piece of equipment from other circuitry e Watch trends rather than relying on single spot readings 14 Megohmmeter Models 6501 6503 4 5 Utilization of the Guard Terminal Model 6503 Insulation Shield C Conductor D Exposed surface Figure 4 1 Guard terminals are useful when measuring high resistance values and for stabilizing readings When testing the insulation at the end of a cable it is necessary to eliminate the error from surface leakage which occurs particularly at high resistance values The purpose of the guard terminal is to provide a third terminal within the path of the surface leakage D Connect the instrument as shown in Figure 4 1 If there is no shield at B use a copper wire wound several times around the exposed surface B Note If a shield is not available and you do not make up a shield around B and connect to the guard terminal the measuremen
5. 0 5 to 5 5MQ 5 5 to 200 0 500V 1 to 11MQ 11 to 500MQ 1000V 10 to 110MQ 110 to 5000 0 Short Circuit 5mA max Current Accuracy 2 5 Scale Length Resistance Tests Measurement Range 0 to 45 45 to 500 _ Auto Ranging DC Test Current 1mA constant 500V max _ Accuracy 2 5 Scale Length _ Automatic 5s uF 8s uF Discharge Continuity Tests Test Voltage 5mA constant 10V max Measurement Range 01090 10101000 Auto Ranging Accuracy 2 5 of Scale Length _ Fuse Protection 0 2 600V HPC 6x32mm _ Voltage Tests Safety Check Voltage Range 0 to 600VAC Frequency 45 to 450Hz Accuracy 3 of Scale Input Impedance 100kQ approx 10 Megohmmeter Models 6501 6503 MODELS 6501 6503 Scale Direct reading on all ranges 3 76mm black on white Test Voltage Amber LED indicates proper Green LED indicates proper Indicator test voltage and crank speed test voltage and speed NOTE If the LED is not ON during NOTE If the LED is not ON during testing the reading is not valid testing the reading is not valid Auto Range Red LED indicates Auto Range Red LED indicates Auto Range Indicator multiply amp Q multiply readings x 10 readings x 10 Operating Range Storage Range Power Source Hand cranked heavy duty brushless alternator and solid state rectification and amplification for stab
6. 03 1 3 Receiving Your Shipment Upon receiving your shipment make sure that the contents are con sistent with the packing list Notify your distributor of any missing items If the equipment appears to be damaged file a claim imme diately with the carrier and notify your distributor at once giving a detailed description of any damage Save the damaged packing container to substantiate your claim Do not use an instrument that appears to be damaged 1 4 Ordering Information Megohmmeter Model 6501 Cat 2126 51 Includes a soft carrying case two color coded leads two insulated alligator clips test probe and user manual Megohmmeter Model 6503 Cat 2126 52 Includes a soft carrying case three color coded leads three insulated alligator clips test probe and user manual 1 4 1 Accessories and Replacement Parts Replacement 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 Megohmmeter Models 6501 6503 5 2 PRODUCT FEATURES 2 1 Description The Models 6501 and 6503 are compact self contained
7. 6501 6503 Jy AEMC User Manual AEMC Statement 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 For recalibration please use our calibration services Refer to our repair and calibration section at www aemc com 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 AE M d b a AEMC Instruments INSTRUMENTS www aemc com Table Contents INTRODUCTION 3 1 1 International Electrical 4 1 2 Definition of Measurement 4 1 3 Receiving Your Shipment 5 1 4 Ordering Information 5 1 4 1 Accessories
8. Technical and Sales Assistance 26 Limited Warranty ntt re e Det 27 Warranty 2 2 2 20 0200000000000000000000000000000 1 27 CHAPTER 1 INTRODUCTION A Warning A These safety warnings are provided to ensure the safety of personnel and proper operation of the instrument Read the instruction manual completely and follow all safety information before operating this instrument Safety is the responsibility of the operator Tests are to be carried out only on dead circuits Check for live circuits before making resistance measure ments safety check These megohmmeters are rated for 600V CAT Il or 300V CAT III Pollution Degree 2 The Megohmmeter Models 6501 6503 are sources of high voltage as is the sample connected to them All persons performing or assisting in the tests must employ all safety precautions to prevent electrical shock to themselves and to others AEMC Instruments considers the use of rubber gloves to be an excellent safety practice even ifthe equipment is properly operated and correctly grounded When testing capacitance samples make sure that they have been properly discharged and that they are safe to touch Dielectric insulation samples should be short circuited for at least five times the amount of time they were energized Use the leads supplied with the megohmmete
9. al S 4 5 NO Under Test Cable Insulation Figure 4 4 Megohmmeter Models 6501 6503 17 Figures 4 5 shows the connections for testing insulation from a supply conductor to ground motor frame Conductor Under Test Cable Insulation Figure 4 5 18 Megohmmeter Models 6501 6503 Figure 4 6 shows the connections to transformer lighting dis tribution Make sure that the switches and or circuit breakers on both sides are open Check the high voltage winding to ground low voltage to ground and the resistance between them with no winding ground Transformer Grounding Lug Figure 4 6 Megohmmeter Models 6501 6503 19 Figure 4 7 shows the connections for measuring the insulation of a three phase line to ground by connecting the jumpers between phases This gives a reading of all conductors at once Ifa load such as a motor heater etc is attached to the other end of the line it will read the load resistance to ground at the same time By removing the jumpers readings can be made between the individual conduc tors and ground Jumpers Figure 4 7 20 Megohmmeter Models 6501 6503 4 7 Insulation Resistance Motors Figure 4 8 shows reading the resistance to ground of a three phase motor winding Since the three phase motors are internally con nected it is only necessary to connect one lead to the motor lead and the other lead to the motor frame as shown Figure 4 8 Megohmmeter
10. eading scale e 600 test voltage range safety check Megohmmeter Models 6501 6503 7 2 3 Model 6501 Control Features gt MEGOHMMETER Figure 2 1 Line terminal Black Fuse 0 2A Earth terminal Red Amber LED illuminates when proper crank speed is attained indicating presence of selected output Foldaway handle Mechanical zero adjustment screw Range switch safety test first on range to 600VAC Autoranging Red LED illuminates when reading needs to be multiplied x10 to obtain the true value ranges Security finger rest isolates users hand from terminals while giving a firm grip during an operation Megohmmeter Models 6501 6503 2 4 PONS Model 6503 Control Features Figure 2 2 Line terminal Black Guard terminal Blue Earth terminal Red Green LED illuminates when proper crank speed is attained indicating presence of selected test voltage Foldaway handle Mechanical zero adjustment screw Range switch Safety test first 600V V range to 600VAC Autoranging Red LED illuminates when reading needs to be multiplied x10 to obtain the true value range Security finger rest isolates users hand from terminals while giving a firm grip during an operation Megohmmeter Models 6501 6503 9 MODELS ELECTRICAL Insulation Tests Test Voltage 250V CHAPTER 3 SPECIFICATIONS 6501 6503 1to 11MQ 11 to 500MO
11. hand cranked megohmmeters They are practical and dependable instruments designed for a broad range of plant and field service applications such as acceptance testing and preventive maintenance of wiring cables switchgear and motors The easy hand cranked operation provides a steady rectified DC voltage output across the entire range for consistently reliable readings These megohmmeters incorporate a built in generator and a con stant DC voltage circuit to provide a stable output and give direct insulation resistance reading The Models 6501 6503 have a unique auto ranging feature which expands the scale by x10 and almost doubles the scale length When the pointer reaches near the end of scale the auto ranging feature activates returning the pointer to the beginning of the scale with the x10 red LED indicator on Insulation resistance is indicated with a rugged taut band meter movement on a logarithmic scale The indicator scale is easy to read 2 2 Features Measures insulation at 500V resistance and continuity Model 6501 Three test voltages 250V 500V 1000V Model 6503 6 Megohmmeter Models 6501 6503 Test voltage constant across the entire measurement range Autoranging and Q ranges Model 6501 e Autoranging MO ranges Model 6503 Designed for harsh environments offshore mining heavy duty field industrial and military use e Compact self contained package folding crank Large direct r
12. into the electronic module Make sure the megohmmeter and all leads are dry before further use 24 Megohmmeter Models 6501 6503 5 3 Fuse Replacement WARNING For your safety fold the crank and disconnect all of the leads from the meter With a flat screwdriver or a coin push and turn the fuse holder a quarter turn counter clockwise Replace the fuse with an identical one 0 2A 600V HPC 6x32mm Megohmmeter Models 6501 6503 25 Repair Calibration To ensure that your instrument meets factory specifications we recommend that it be scheduled back to our factory Service Center at one year intervals for recalibration or as required by other standards or internal procedures For instrument repair and calibration You must contact our Service Center for a Customer Service Authorization Number CSA This will ensure that when your instrument arrives it will be tracked and pro cessed promptly Please write the CSA on the outside of the shipping container If the instrument is returned for calibration we need to know if you want a standard calibration or a calibration traceable to 1 5 Includes calibration certificate plus recorded calibration data Ship To Chauvin Arnoux Inc d b a AEMC Instruments 15 Faraday Drive Dover NH 03820 USA Phone 800 945 2362 Ext 360 603 749 6434 Ext 360 Fax 603 742 2346 or 603 749 6309 E mail repair aemc com Or contact your authorized distributor
13. le voltage test voltage reached at 140rpm approx Meter Movement Rugged taut band suspension MECHANICAL Dimensions 4 7 x 4 7 x 5 1 120 x 120 x 130mm Weight 2 5 Ibs 1 1kg Terminals Line red earth black accepts standard 4mm safety plugs ENVIRONMENTAL Temperature Reference 68 to 79 F 20 to 26 C 30 to 50 RH 14 to 113 F 10 to 45 C 0 to 75 RH 4 to 176 F 20 to 80 C 0 to 90 SAFETY Sealed IP54 with lid IP52 without lid Rating EN 61010 1 600V CAT II 300V CAT Ill Pollution Degree 2 Double Insulation Yes CE Mark Yes Specifications are subject to change without notice Megohmmeter Models 6501 6503 11 4 41 Auto ranging How works When the pointer reaches approximately 90 the full scale length the auto range is triggered the red auto range x10 LED lights up The pointer goes back to the beginning of the scale and resumes its travel The readings should be multiplied by 10 when the x10 LED is on 42 Safety Check Voltage Test A Before measuring insulation resistance confirm that the sample is fully discharged particularly in dielectric and capacitance samples and that the sample is not connected to an energized circuit To perform the voltage test set the range selection to V MO Model 6501 500V Model 6503 connect and read on the red voltage scale 600VAC max DO NOT CRANK If meas
14. ngs but a good guide would be 1 for every one hundred applied operating volts as a minimum figure This applies to motors and transformers When the insulation resistance gets this low an electrical break down can be expected at any time and rewinding or replacing should be considered It is not unusual for a winding to be 10 to 100 times the recom mended minimum value IEEE standard 43 2000 Recommended Practice for Testing Insulation Resistance of Rotating Machinery but this varies with temperature and humidity Megohmmeter Models 6501 6503 13 4 3 3 Ratio Testing In time resistance reading Dielectric Absorption Ratio readings are taken at 30 seconds and 60 seconds to obtain the dielectric absorption ratio Insulation resistance 60s n Dielectric Absorption ratio Insulation resistance 30s DAR This test is useful to increase the accuracy of spot testing In gen eral a ratio of 1 25 2 or better should be required A ratio below this indicates that repair is probably needed Remember that a DC insulation test may be used for acceptance testing but is more commonly used to check the gradual deteriora tion of equipment over its life Consult your equipment manufacturer for specific test or test voltage if not known Insulation resistance decreases with moisture temperature and age and should be recorded over time at a given temperature and cor rected 4 4 Successful Insulation Resistance Testing Check
15. r If defective or used replace before testing Megohmmeter Models 6501 6503 3 1 1 P D 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 I 1 2 CAT Il CAT Ill In conformity with WEEE 2002 96 Definition of Measurement Categories For measurements on circuits not directly connected to the AC supply wall outlet such as protected secondaries signal level and limited energy circuits For measurements performed circuits directly connected to the electrical distribution system Examples are measurements on household appliances or portable tools For measurements performed in the building installation at the distribution level such as on hardwired equipment in fixed installation and circuit breakers For measurements performed at the primary electrical supply lt 1000V such as on primary overcurrent protec tion devices ripple control units or meters Megohmmeter Models 6501 65
16. rument to us for repair provided we have your warranty registration information on file or a proof of purchase AEMC Instruments will at its option repair or replace the faulty material REGISTER ONLINE AT www aemc com Warranty Repairs What you must do to return an Instrument for Warranty Repair First request a Customer Service Authorization Number CSA by phone or by fax from our Service Department see address below then return the instrument along with the signed CSA Form Please write the CSA on the outside of the shipping con tainer Return the instrument postage or shipment pre paid to Ship To Chauvin Arnoux Inc d b a AEMC Instruments 15 Faraday Drive Dover NH 03820 USA Phone 800 945 2362 Ext 360 603 749 6434 Ext 360 Fax 603 742 2346 or 603 749 6309 E mail repair aemc com Caution To protect yourself against in transit loss we recommend you insure your returned material NOTE You must obtain CSA before returning any instrument Megohmmeter Models 6501 6503 27 5 AEMC INSTRUMENTS 12 10 99 MAN 100328 v5 Chauvin Inc d b a Instruments 15 Faraday Drive Dover 03820 USA Phone 603 749 6434 Fax 603 742 2346 www aemc com
17. t will be erroneous and lead to confusion as to the cable s state Megohmmeter Models 6501 6503 15 If the guard terminal is not connected at the instrument mea sures the current 1 flowing through the insulation and a surface leakage current i1 See Figure 4 2 NO CONNECTION to Guard terminal B Rx resistance through insulation Ry surface resistance Rz surface resistance To EARTH To LINE terminal A terminal Figure 4 2 When the guard terminal is connected at the instrument mea sures the current not the surface leakage current i1 which is not included in the measurement See Figure 4 3 This type of measurement will give the true value of the resistance Rx provid ing the Ry and Rz are not too low To Guard terminal Rx resistance through insulation Ry surface resistance Rz surface resistance To EARTH To LINE terminal A terminal Figure 4 3 16 Megohmmeter Models 6501 6503 4 6 Insulation Measurement Connections Figures 4 4 shows the 5 to measure the insulation one conductor to the other conductors The cable should be dis connected at both ends to avoid leakage through switchboards and panels For the Model 6503 the connection to the guard terminal is used to eliminate the effects of surface leakage across exposed insulation at one end of the cable Refer to the section on Utilization of the Guard Termin
18. uring on a DC circuit the pointer will deflect but the measurement may be inaccurate 43 Insulation Resistance Testing Range After checking for a live circuit see safety check select the test volt age and connect the megohmmeter Several connection examples are illustrated further Crank the handle until the Amber LED Model 6501 or Green LED Model 6503 on the upper right hand side lights ensuring that the selected test voltage has been reached 12 Megohmmeter Models 6501 6503 4 31 Test Voltage No published standard tells which voltage to choose for any given winding However published recommendations could be summa rized as follows Rated Voltage of Motor Test Voltage Below 115 250V 115 250 or 500V 230 500V 460 500 or 1000V 4 32 Spot Testing As a general rule in spot testing test voltage should be applied until no variation in reading is noted for 15 seconds or applied for a fixed 60 seconds On circuits cranking for up to a minute more may be necessary to fully charge the sample What minimum value should be measured The IEEE standard 43 2000 states that it is impossible to specify the value of insulation resistance at which a winding will fail electrically but on motors minimum read ings generally stated are Rated Voltage R minimum 250 or less 2 MQ 460 2 MQ There is no fixed figure for determining what is good and bad in resistance readi
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