Megohmmeters Model 1020 Model 1025
Contents
1. Figure 4 12 Megohmmeter Models 1020 and 1025 Figures 5 and 6 show the connections for testing insulation from a supply conductor to ground motor frame Conductor Under Test Cable Insulation Figure 5 Conductor Under Test Cable Insulation un c WIL I Figure 6 Megohmmeter M odels 1020 and 1025 13 Figure 7 shows the connec tions to a transformer light ing or distribution 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 wind ing grounded Jumpers Figure 8 14 d MEGOHVMETER I AEME MODEL 1020 marr Tested Winding Transformer Grounding Lug C ucuEg WESCHWEIER AEME MODEL 1020 SE ICU Figure 7 Figure 8 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 If a load such as a motor heater etc is attached to the other end of the line it will read the load resis tance to ground at the same time By removing the2. 10 Megohmmeter Models 1020 and 1025 Remember a DC insulation test may be used for acceptance testing but is more commonly used to check the gradual deterioration of equipment over its life Consult your equipment manufacturer for spe cific 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 corrected FOR SUCCESSFUL INSULATION RESISTANCE TESTING Check with the equipment manufacturer for factory insulation 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 temperature see IEEE Std 4443 1974 Temperature Correction Curve Know what you are testing Isolate the piece of equipment from other circuitry Watch trends rather than relying on single spot readings Megohmmeter M odels 1020 and 1025 11 INSULATION MEASUREMENT CONNECTIONS Figure 4 shows the connections to measure the insulation of one con ductor to the other conductors The cable should be disconnected at both ends to avoid leakage through switchboards and panels Conductor Under Test Cable Insulation
3. 16 Megohmmeter Models 1020 and 1025 When the resistance is less than 100Q it will be indicated by a con tinuous beeper If an open circuit has been detected the display will read Figure 13 Resistance Measurements Set the switch to the Q position Connect the red lead in the earth position and the black lead in the middle jack position CO 0 face Le Figure 14 The instrument has a measurement range of 0 1 to 200Q Connect the leads to the device under test If an open circuit has been detected the display will read Figure 15 Megohmmeter Models 1020 and 1025 17 Data Hold Will hold last measured value in memory when the Data Hold position is in the ON position NOTE You must hold down the yellow test button to keep the value displayed The value in memory will still be displayed if leads are disconnected as long as the yellow test button is depressed Timer The instrument may be used in a hands free operation by moving the timer switch to the three minute position and then pressing the yellow test button If the yellow test button is pressed when the switch is in the three minute position it will shut the instrument off NOTE After three minutes all data will be lost If a DAR Dielectric Absorption Ratio test is performed the user will have to record the value after 30 seconds and 60 seconds Insulati i LT Gets Dielectric Absorption Ratio DAR Insulation resistance 30s
4. Megohmmeter M odels 1020 and 1025 Model 1025 MEGOHMMETER AEMC MODEL 1025 Figure 2 1 Digital Display 4 Press to Test Button 2 Data Hold Switch 5 Range Selector Switch 3 Manual and Lock Switch 6 Test Terminals locks power on for 3 minutes 8 Megohmmeter Models 1020 and 1025 Safety Check Voltage Test NOTE Make sure the jacks are firmly inserted into the megohm meter prior to performing any electrical tests 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 per form the voltage test 1 Insert the red lead into the earth position and the black lead in the middle jack position 2 Set the range selection switch to the VAC position 3 Connect to the sample os under test AC a 5 4 Press the test button 1 t LS Figure 3 Insulation Resistance Testing M 2 Range After checking for a live circuit see Safety Check connect the megohmmeter See Figures 4 through 11 for examples TEST VOLTAGE No published standard tells which voltage to choose for any given winding However published recommendations are summarized as follows Rated Voltage of Motor Test Voltage Below 115 250 V 115 250 V or 500 V 230 500 V 460 500 V or 1000 V Megohmmeter Models 1020 and 1025 9 SPOT TESTING As a general rule in spot testi
5. jumpers read ings can be made between the individual conductors and ground Megohmmeter Models 1020 and 1025 INSULATION RESISTANCE MEASUREMENTS ON MOTORS Figure 9 shows reading the resistance to ground of a three phase motor wind ing Since the three phase motors are internally con nected it is only neces sary to connect one lead to the motor lead and the other lead to the motor frame as shown Figure 10 Megohmmeter Models 1020 and 1025 Figure 10 shows the windings of a 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 15 Figure 11 shows connections for testing insulation from a supply conductor in a switch box to ground motor frame An identical test may be car ried out from the motor starter IN Figure 11 Continuity Measurements Once it has been verified that no voltage is present the continuity check may be performed Set the switch to the Q position Connect the red lead in the earth position and the black lead in the middle jack position Figure 12
6. 2 603 749 6434 Fax 603 742 2346 Caution To protect against in transit loss we recommend you insure your returned material For full warranty coverage please read the Warranty Card which is affixed to the Warranty Registration Card Please keep the Warranty Card with your records Megohmmeter Models 1020 and 1025 23 NOTES 24 Megohmmeter Models 1020 and 1025 Megohmmeter Models 1020 and 1025 25
7. 3 digits 1000 to 2000 MQ 5 of reading 3 digits Model 1025 only Test Voltage Generation Solid state circuitry generating test voltage 10 RESISTANCE TESTS Q Range 0 1 to 200Q Accuracy 1 of reading 2 digits Maximum Open Circuit Voltage 3 3 V Overload Protection 500V DC AC Accuracies are at 23 C 5 C below 80 RH Megohmmeter Models 1020 and 1025 CONTINUITY TESTS Q Range 0 1000 with eu display and beeper Resolution 0 1Q Operation Resistance lt 1000 Max Open Circuit Voltage 3 2 V Overload Protection 500 V DC AC VOLTAGE TESTS SAFETY CHECK Vac Range 0 600 V AC Resolution 1 V Accuracy 0 8 of reading 3 digits Input Impedance 10 MQ GENERAL SPECIFICATIONS Power Supply Six 1 5 V AA batteries Low Battery Indication Indicator on LCD Display 3 1 2 digit LCD 0 65 height Overrange Indicator Highest digit of 1 displayed Operating Temperature 32 to 104 F 0 to 40 C Storage Temperature 14 to 140 F 10 to 60 C Operating Humidity 0 80 RH Storage Humidity 0 70 RH Dimensions 6 5 x 3 9 x 2 2 165 x 100 x 57mm Weight 1 1 Ib 500 g approx Accuracies are at 23 C 5 C below 80 RH 6 Megohmmeter Models 1020 and 1025 Model 1020 MEGOHMMETER MODEL 1020 Figure 1 1 Digital Display 4 Press to Test Button 2 Data Hold Switch 5 Range Selector Switch 3 Manual and Lock Switch 6 Test Terminals locks power on for 3 minutes
8. CAUTION The timer will keep the output leads energized for three minutes After three minutes the display will go blank and all mea sured data will disappear This instrument was not designed to perform a Polarization Index PI Test because the test voltage cannot be locked for 10 minutes If a PI Test is required the user will have to hold down the test button and record the readings at 1 minute and 10 minutes l lati i 1 i nsulation resistance 10 min Polarization Index PI Insulation resistance 1 min 18 Megohmmeter Models 1020 and 1025 Maintenance Battery Replacement Replace batteries only when the megohmmeter is not connected to a sample and OFF including Timer to Man position When battery voltage is not sufficient the low BT symbol will be dis played Remove the screw from the middle of the instrument and remove the back cover Replace the 6 AA batteries Reinstall the back cover and screw to secure the back cover Megohmmeter M odels 1020 and 1025 19 Repair and Calibration North South America Australia New Zealand To guarantee that your instrument complies with the factory specifi cations we recommend that the Megohmmeter Models 1020 and 1025 be submitted to our factory service center at one year intervals for recalibration or as required by other standards For instrument repair and or calibration please call our USA factory toll free at 800 945 AEMC 800 945 2362 Cha
9. Megohmmeters Model 1020 Model 1025 AEMG Chauvin Arnoux Inc d b a AEMC Instruments 99 MAN 100110 Rev 02 06 97 Megohmmeters Model 1020 Model 1025 USER MANUAL MEGOHMMETER MODEL 1025 Wet ua VaclQ MQ vito O AEMG Owner s Record The serial number for the Megohmmeter Model 1020 or Model 1025 is located on the back of the instrument Please record this number and purchase date for your records MEGOHMMETER MODEL 1020 CATALOG 2111 91 SERIAL PURCHASE DATE DISTRIBUTOR MEGOHMMETER MODEL 1025 CATALOG 2111 87 SERIAL PURCHASE DATE DISTRIBUTOR 99 MAN 100110 2nd Revision AEMC Instruments Printed 07 97 by Chauvin Arnoux Inc Table of Contents Warning oe inh eal e pr Bebe me a eee ath fale ae us 2 International Electrical Symbols 2 Receiving Your Shipment 00 000 cee eee eee 3 PACKAGING 3 1 io sanieren 3 VOESCMPUONL eraa Ra Sa ed eee de 3 Features reset uw idu intus ee eed eek e rand 4 SPEGIHIEALIONS 1 2 e Ra Seo eis 5 Safety Check Voltage Test llle 9 Insulation Resistance Testing MO Range 9 lest Voltage i 2 utmise Dele setae BILE QAO eer 9 Spot Testing 2 2 0 0 cee eee 10 Ratio Testing rrerenuenee 10 For Successful Insulation Resistance Testing 11 Insulation Measurement Connections 12 Insulation Resistance Me
10. asurements on Motors 15 Continuity Measurements 0 0 00 16 Resistance Measurements ea 17 Data Hold o rs BAL ee uss lese et LB slay 18 TIHASE Sera u a en 18 Maintenance comens ee i a a E eee 19 Repair and Calibration lisse 20 North South America Australia New Zealand 20 Europe Asia Africa e 21 Technical and Sales Assistance 22 Limited Warranty 0 0 00 eee ee 23 Warning These safety warnings are provided to ensure the safety of per sonnel and proper operation of the instrument Read this instruction manual completely before attempting to use or service this instrument and follow all safety information Safety is the responsibility of the operator Tests are to be carried out only on dead circuits Check for live circuits before making resistance measurements safety check Always make connections from the instrument to the circuit under test The Megohmmeter Models 1020 and 1025 are sources of high voltage as is the sample connected to them All persons per forming or assisting in the tests must employ all safety precau tions to prevent electrical shock to themselves and to others AEMC considers the use of rubber gloves to be an excellent safety practice even if the equipment is properly operated and correctly grounded When testing capacitance samples make sure that they have been pro
11. ng test voltage should be applied until no variation in reading is noted for 15 seconds or applied for a fixed 60 seconds What minimum value should be measured The IEEE standard No 43 1974 states that it is impossible to specify the value of insulation resistance at which a winding will fail electrically but on motors minimum readings 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 resis tance readings but a good guide would be 1 megohm for every 100 applied operating volts as a minimum figure This applies to motors and transformers When the insulation resistance gets this low an electrical breakdown 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 recommend ed minimum value IEEE standard 43 1974 Recommended Practice for Testing Insulation Resistance of Rotating Machinery but this varies with temperature and humidity RATIO TESTING In time resistance testing Dielectric Absorption Ratio readings are taken at 30 and 60 seconds to obtain the dielectric absorption ratio Insulation resistance 60s Insulation resistance 30s Dielectric Absorption Ratio DAR This test is useful to increase the accuracy of spot testing In gener al a ratio of 1 5 or better should be required A ratio below this indi cates that repair is probably needed
12. perly 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 Never open the back of the instrument while connected to any circuit or input International Electrical Symbols AN This symbol signifies CAUTION and reguests that the user refer to the user manual before using the meters 2 Megohmmeter Models 1020 and 1025 Receiving Your Shipment Upon receiving your shipment check to be sure that the contents agree with the packing slip Notify your distributor at once of any shortages If the equipment appears to be damaged file a claim immediately with your carrier and notify your distributor at once giv ing a detailed description of the damages Save the damaged pack ing container to substantiate your claims Packaging Megohmmeters Model 1020 Cat 2111 91 and Model 1025 Cat 2111 87 are shipped with a carrying case two color coded leads six 1 5 V AA batteries and an instruction manual Description Model 1020 and Model 1025 are compact light weight battery oper ated digital megohmmeters The Model 1020 tests at 250 V and 500 V up to 200 MQ The Model 1025 adds an additional voltage range of 1000 V and measures up to 2000 MQ The Models 1020 and 1025 also feature a continuity test range with an audible beeper for resistances under 10002 and a 600 V AC range for safety voltage check The press
13. to test button has an associated locking feature for contin uous tests up to three minutes eliminating the need to hold down the button manually Other features include a large 3 1 2 digit LCD automatic zero data hold switch and low battery indicator These light weight easy to use megohmmeters can be used for most commonly performed insulation tests such as on cables switch gear motors DC generators power tools and small appliances The Models 1020 and 1025 include test leads batteries carrying case and user manual Megohmmeter Models 1020 and 1025 3 Models 1020 1025 Features Model 1020 measures insulation at 250 and 500 V Model 1025 measures insulation at 250 500 and 1000 V Continuity test Continuity beeper 600 V AC safety test voltage range Large easy to read digital display Data hold switch Three minute lock on test button for hands free operation Automatic discharge when test button is released Low battery indication 4 Megohmmeter Models 1020 and 1025 Models 1020 1025 Specifications ELECTRICAL SPECIFICATIONS INSULATION TESTS DC Tesi Voltage 250 V and 500 V Model 1020 250 500 1000 V Model 1025 Megohm Range 0 1 to 200 MQ Model 1020 and 1025 1 to 2000 MQ Model 1025 1000 V Resolution 250 and 500 V 0 1 MQ 1000 V 1 MQ Short Circuit Current 0 4 mA max at 250 V 0 9 mA max at 500 V 1 7 mA max at 1000 V Accuracy 0 1 to 1000 MQ 3 of reading
14. uvin Arnoux Inc d b a AEMC Instruments 15 Faraday Drive Dover NH 03820 USA Tel 800 945 2362 603 749 6434 Fax 603 742 2346 www aemc com Or contact your authorized distributor 20 Megohmmeter Models 1020 and 1025 Repair and Calibration Europe Asia Africa To guarantee that your instrument complies with the factory specifi cations we recommend that the Megohmmeter Models 1020 and 1025 be submitted to our factory service center at one year intervals for recalibration or as required by other standards For instrument repair and or calibration please call our French factory Manumesure Reux 14130 Pont l Ev que France Tel 33 2 31 64 51 43 Fax 33 2 31 64 51 09 www aemc com Or contact your authorized distributor Megohmmeter Models 1020 and 1025 21 Technical and Sales Assistance North South America Australia New Zealand If you are experiencing any technical problems or require any assis tance with the proper use or application of this instrument please call our technical hotline Chauvin Arnoux Inc d b a AEMC Instruments 200 Foxborough Blvd Foxborough MA 02035 USA Tel 800 343 1391 508 698 2115 Fax 508 698 2118 www aemc com Technical and Sales Assistance Europe Asia Africa If you are experiencing any technical problems or require any assis tance with the proper use or application of this instrument please call our technical hotline Chauvin Arnou
15. x 190 rue Championnet 75876 Paris Cedex 18 France Tel 33 1 44 85 44 57 Fax 33 1 46 27 95 59 www aemc com 22 Megohmmeter Models 1020 and 1025 Limited Warranty The Megohmmeter Models 1020 and 1025 are warranted to the owner for a period of 1 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 if the Megohmmeter Model 1020 or 1025 has been tampered with abused or if the defect is related to service not per formed by AEMC Instruments What AEMC Instruments Will Do If a malfunction occurs within the 1 year period you may return the Megohmmeter Model 1020 or 1025 to us for repair or replacement free of charge provided we have your REGISTRATION CARD on file AEMC Instruments will at its option repair or replace the faulty material Note If a card is not on file we will require a dated proof of purchase as well as your REGISTRATION CARD accompanied by the defec tive material What You Must Do First obtain a return authorization by phone or by fax from AEMC Instruments then return the Megohmmeter Model 1020 or 1025 indicating place and date of purchase with a written explanation of the reason for return Return material postage pre paid to Chauvin Arnoux Inc d b a AEMC Instruments Service Department 15 Faraday Drive Dover NH 03820 USA Tel 800 945 236
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