Model 1000 - Chauvin Arnoux Group
Contents
1. 16 Insulation Resistance Measurements on Motors 19 Understanding Insulation Testing 21 Types of Tests u uuu ines 22 Spot Reading Test 22 Ratio Testing eet aqa e kasara 22 Dielectric Absorption Test 23 Step Voltage TeSt e u ua tcn head 24 Effects of Temperature seen 25 Interpreting the Results u uu 26 ESD Conductivity Test Kit Megohmmeter Model 1100N 27 Receiving Your Shipment 27 Packaging icti te rte ot e re eta iege e eda 27 Accessories and Replacement Parts 27 Description uuu tice ee el enti ede La 28 Specifications 4 ete be aq h aaa 29 Battery Replacement esse 31 AC Supply Module sss 31 Resistance Testing of Conductive Flooring 32 Measurement Results sse 34 Maintenance siot nai RAP Su u Sa y aos 35 Glea ing u u L td eter ei n eMe been eene epu pas 35 Repair and Calibration sese 36 Technical ASSIStanCe uuu eee te toit tco rcl 36 Megohmmeter Model 1000N 1100N AN Warning A These safety warnings are provided to ensure the safety of personnel and proper operation of the instrument2. eT s Megohmmeter Model 1000N 1100N Types of Tests SPOT READING TEST Method For this test the megohmmeter is connected across the insulation of the windings of the machine being tested A test voltage is applied for a fixed period of time usually 60 seconds and a reading is taken The spot reading test should only be carried out when the winding temperature is above the dewpoint The operator should note the winding temperature so that the reading may be corrected to a base temperature of 20 C 68 F Test Duration To obtain comparable results tests must be of the same duration Usually the reading is taken after 60 seconds Interpreting the Results Proper interpretation of spot reading tests requires access to records of results from previous spot reading tests For conclusive results only use results from tests performed at the same test voltage for the same amount of time under similar temperature and humidity conditions These readings are used to plot a curve of the history of insulation resistance A curve showing a downward trend usually indicates a loss of insulation resistance due to unfavorable conditions such as humidity dust accumulation etc A very sharp drop indicates an insulation failure 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 Dielectric Absorption
3. WARNING HIGH VOLTAGE PRESENT e Do not attempt to perform any tests with these instruments until you have read the instruction manual Safety is the responsibility of the operator Tests are to be carried out only on non energized circuits Check for live circuits before making resistance measurements safety check The Megohmmeters Models 1000N and 1100N 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 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 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 Megohmmeters should never be used in an explosive environment Use the leads supplied with the megohmmeters If they are defective or worn replace before testing International Electrical Symbols This symbol signifies that the instrument is protected by double E or reinforced insulation Use only specified replacement parts when servicing the instrument A This symbol signifies CAUTIONI and requests that the user refer to the user manual before using the instrument AN Risk of electric sho
4. A series of steps each step lasting 60 seconds Interpreting the Results Compare the readings taken at different voltage levels looking for any excessive reduction in insulation resistance values at the higher voltage levels Insulation that is thoroughly dry clean and without physical damage should provide roughly the same resistance values despite changes in test voltage levels If resistance values decrease substantially when tested at higher voltage levels this should serve as a warning that insulation quality may be deteriorating due to dirt moisture cracking aging etc 24 Megohmmeter Model 1000N 1100N The Effects of Temperature Insulation resistance measurements are changed by variations in temperature of the insulation material Typically when the temperature goes up the insulation resistance will go down Inversely when the temperature drops the insulation resistance will increase in value The best way to obtain consistent measurement results is to test the insulation at a standard temperature typically 68 F 20 C If the temperature of the material you are testing is either higher or lower than 68 F 20 C refer to the temperature correction chart see table As a general rule the insulation resistance value may be corrected by e Halving the resistance measurement value for every 10 C above the base temperature of 68 F 20 C or e Doubling the resistance value for every 10 C below 68 F 20
5. C oG oF Multiplication Factor 0 32 0 25 5 41 0 36 10 50 0 50 15 59 0 75 20 68 1 00 25 77 1 40 30 86 1 98 35 95 2 80 40 104 3 95 45 113 5 60 50 122 7 85 55 131 11 20 60 140 15 85 65 149 22 40 70 158 31 75 75 167 44 70 80 176 63 50 25 Megohmmeter Model 1000N 1100N Interpreting the Results Insulation resistance values are a function of the type of insulating material The actual value you read may vary greatly and is not as important as the trends of the values over time This is why the resistance measurement must be taken in a greater context Some other factors to consider are Previous Testing Results These are very important since they will indicate the decline in the insulation resistance over time All new equipment should be tested and documented to serve as a benchmark for future testing Careful Visual Inspection By taking a very close look at the equipment you are testing it may be possible to see cracks excessive moisture burn marks etc which may over time cause catastrophic equipment failure Manufacturers Recommendations for Specific Equipment The definitive source for information on a specific piece of equipment is its manufacturer Most manufacturers will provide basic information about the insulation resistance which may be encountered during testing Comparisons with Similar Equipment Similar equipment should provide similar
6. Cat 2110 02 Fuse set of one O 3A u u a a a aaa ua PN qu aaaea Cat 100 429 Floor weights set of two Cat 2118 05 Carrying Case U a Su h huuu ni nnne Cat 2118 07 Set of 3 leads for 1100N Cat 2118 42 7 Pin shielded lead 25 ft for 1100N 5100 Cat 2118 26 AC power supply module with line cord and plug for switch selectable 110 220VAC at 47 to 400Hz Cat 100 142 Fuse set of five 0 1A slow blow for AC supply module Cat 100 438 Replacement Leads for Model 1100 Set of leads 25 ft shielded lead two safety leads alligator clip and test probe Cat 2118 06 295 Megohmmeter Model 1000N 1100N Description ESD Conductivity Test Kit Megohmmeter Model 1100N Kit Cat 2110 03 is designed specifically for floor resistance testing in areas where electrostatic discharge is a problem such as computer rooms electronic assembly rooms hospitals etc The kit includes a 1000V megohmmeter which features excellent resolution in the critical 10 to 10 Q ranges and fine resolution up to 10 Q 25 foot shielded lead and two floor weights NFPA probes for consistent and repeatable contact with the surface under test The Model 1100N is useful for testing effectiveness of conductive carpets mats tables chairs
7. Figure 13 shows the windings of a three phase motor separated Some times 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 megohm meter 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 12 shows reading the resistance to ground of a three phase motor winding Since the three phase motors are internally connected it is only necessary to connect one lead to the motor lead and the other lead to the motor frame as shown Figure 12 GUARD EARTH MEGOHMMETER Figure 13 19 Megohmmeter Model 1000N 1100N Figure 14 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 Connect to one leg on the motor side of the switch Starter in Grounded motor frame GUARD EARTH MEGOHMMETER Figure 14 20 Megohmmeter Model 1000N 1100N Understanding Insulation Testing Insulation is the material between two points of different potential which through high resistivity prevents the flow of current between those points Insulation failure is one of the most common problems associated with electrical equipment breakdown A megohmmeter is an insulation resistance test
8. Precautions when Making DC Insulation Tests The equipment should be taken off the line sufficiently in advance to permit it to cool to ambient temperature When you are testing windings they should be clean and dry let solvents and cleaners evaporate Should foreign matter or wet surfaces be present erroneous readings may result A clean dry sample s resistance may rise for 5 to 15 minutes whereas a wet dirty one will stabilize quickly Make sure that the equipment tested is properly discharged and grounded before testing When testing individual windings connect all other windings not under test together and ground to motor frame When testing phases be sure they are open to test each individually After applying a test voltage allow sufficient discharge time As a rule discharge twice as long as tested Note The instrument voltmeter will indicate the discharge voltage at the terminals 15 Megohmmeter Model 1000N 1100N Insulation Measurement Connections Conductor under test Figure 7 shows the con 7 nections to measure the insulation of one conductor to the other conductors The cable should be disconnected at both ends to avoid leakage through switchboards and panels GUARD EARTH MEGOHMMETER Figure 7 Figures 8 and 9 show the connection for testing insulation from a supply conductor to a ground motor frame The connection to the guard terminal is used to eliminate the e
9. indicate the condition of the insulation under test A good insulation will show a continual increase in resistance for typically 10 to 15 minutes Contaminated moist or cracked insulation will produce a relatively flat curve A ratio known as the polarization index can be obtained by dividing the value from the 10 minute reading by the value from the one minute reading This polarization index is indicative of the slope of the curve A low polarization index usually indicates excessive moisture and contamination On large motors or generators values as high as 10 are commonly expected Polarization index 10 minute reading 1 minute reading The IEEE Std 43 1974 lists the following minimum values for the polarization index for AC and DC rotating machines Class A 1 5 Class B 2 0 Class C 2 0 2 IEEE Std 43 1974 Recommended Practice for Testing Insulation Resistance of Rotating Machinery 203 Megohmmeter Model 1000N 1100N STEP VOLTAGE TEST Method In this test the operator applies two or more test voltages in steps The recommended ratio for the test voltage steps is 1 to 5 At each step test voltage should be applied for the same length of time usually 60 seconds The application of increased voltage creates electrical stresses on internal insulation cracks This can reveal aging and physical damage even in relatively dry and clean insulation which would not have been apparent at lower voltages Test Duration
10. Ratio DAR Insulation resistance 30s This test is useful for increasing the accuracy of spot testing In general a ratio of 1 25 to 2 or better should be required Below 1 1 is dangerous 1 1 to 1 25 is questionable 1 25 to 1 4 is fair and 1 4 to 2 and above is good A ratio below this indicates that repair is probably needed 1 Dewpoint temperature is the temperature at which the moisture vapor in the air condenses as a liquid 22 Megohmmeter Model 1000N 1100N Remember that a DC insulation test may be used for acceptance testing but is more commonly used to check the gradual deterioration of equipment over its lifetime 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 corrected DIELECTRIC ABSORPTION TEST Method This test is based on the comparison of absorption characteristics of good insulation vs the absorption characteristics of humid or otherwise contaminated insulation During the test a test voltage is applied for an extended period usually 10 minutes The operator takes a reading every 10 seconds for the first minute and then every minute up to 10 minutes A curve is drawn showing the insulation resistance value versus time Test Duration 10 minutes Interpreting the Results If the results were plotted on a graph the slope of the curve would
11. The definitive information on which voltage level to apply as well as which measurement values will indicate a proper resistivity should be determined by the manufacturer of the conductive flooring or tiles The following values based on EOS ESD S4 1 1990 may serve as a minimum resistivity level which has been proven to provide an appropriate level of protection in the manufacturing environment Resistance from test electrode to a groundable point Figure 17 Measured value lt 10 000 megohms 10 gigohms Resistance from electrode to electrode Figure 16 Measured value gt 1 megohm 34 Megohmmeter Model 1000N 1100N Maintenance A Warning e For maintenance use only original factory replacement parts e To avoid electrical shock do not attempt to perform any servicing unless you are qualified to do so e Do not perform any service while the Megohmmeter Model 1000N 1100N is on any circuit e To avoid electrical shock and or damage to the instrument do not let water or other foreign agents into the electronic module Cleaning The megohmmeter may be gently cleaned with a soft cloth soap and water Dry immediately after cleaning Avoid water penetration into the electronic module Make sure the megohmmeter and all leads are dry before further use 35 Megohmmeter Model 1000N 1100N ce Repair and Calibration To guarantee that your instrument complies with the factory specificati
12. at B the instrument measures the current I and not the surface leakage current i which is not included in the measurement See Figure 5 This type of measurement will give the true value of dd the resistance Rx l providing the Ry and gi Rz are not too low To EARTH To LINE Terminal Terminal A gt C l Figure 5 Voltage Measurements Safety Check Insulation resistance tests are to be carried out on non energized circuits only Voltage measurements are made as a safety precaution If any voltage is present do not proceed with insulation resistance testing This instrument can measure both AC or DC voltages For voltage measurements proceed as follows e The PUSH TO TEST button should be in the OFF position e Connect the instrument with the voltage leads connected between the Line and Earth terminals on the unit e Read the voltage directly on the voltage scale MEGOHMMETER Figure 6 14 Megohmmeter Model 1000N 1100N Audible Signal When the PUSH TO TEST button is in the ON or LOCK IN position an audible signal will result This signal consists of approximately one beep every six seconds ten beeps per minute The signal can be used as a time base for monitoring the duration of the test On the MQ and GQ ranges the signal indicates that the instrument is in operation and that the selected DC test voltage may be present on the terminals of the instrument
13. insulation resistance values This would also remain true when testing cables For three phase systems it would be very useful to compare resistive values between the phases By performing insulation resistance tests regularly and recording the test results it may be possible to predict failure by detecting a downward trend in the resistance Careful notations should be made as to time date temperature applications etc The information contained in this manual is intended only as a guide to acceptable procedure it is not intended to be used as a test specification for specific electrical equipment 26 Megohmmeter Model 1000N 1100N ESD CONDUCTIVITY TEST KIT MEGOHMMETER Model 1100N Receiving Your Shipment Upon receiving your shipment check 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 giving a detailed description of the damages Save the damaged packing container to substantiate your claims Packaging ESD Conductivity Test Kit Megohmmeter Model 1100N Cat 2110 03 is shipped with the AEMC Model 1000N megohmmeter two floor weights 25 foot shielded lead two safety leads an alligator clip test probe batteries carrying case and instruction manual Accessories amp Replacements for Model 1100N 1000V Megohmmester a
14. into position This is for insulation resistance tests of long duration such as the Time Resistance or Absorption Test 12 Megohmmeter Model 1000N 1100N Utilizing the Guard Terminal 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 guard terminal provides a third terminal within the path of the surface leakage E Connect the instrument as shown in Figure 3 The guard terminal is useful when Surface measureing very high resistance values Exposed Conductor Insulation Shield to to to Line Guard Earth Terminal Terminal Terminal Figure 3 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 No Connection to B and connect to the Guard Terminal guard terminal the measurement will be D erroneous and lead to confusion as to the cable s condition If the guard terminal is not connected at B the instrument measures the current I flowing through i To EARTH To LINE the insulation and a FART To UNG surface leakage current A C i See Figure 4 Figure 4 ug Megohmmeter Model 1000N 1100N When the guard terminal is connected
15. receptacle L Ps Megohmmeter Model 1000N 1100N Resistance Testing of Conductive Flooring Backqround There are numerous standards currently being developed for measuring conductive flooring resistance under 100V and 500V Actual resistance values vary from specification to specification but 10 to 10 Q are typical values The following simplified procedure is an extrapolation from the ASTM standard F 150 72 You may also refer to other sources such as the NFPA or EOS ESD for alternate procedures General Notes The floor sample should consist of a section covering 48 x 48 inches 1 22 x 1 22 meters in area When the sample is to be tested after installation the test area dimensions should not exceed a section of floor 20 x 20 feet 6 x 6 meters Conditioning Whenever possible condition the test area at least twenty four hours at 73 4 F 1 8 F 23 C 1 C and 50 5 RH and test under the same conditions Test Procedure 1 For uninstalled panels Place the dry specimen as described in General Notes 1 on a nonconductive surface and lightly wipe with a lint free cloth to remove any foreign material prior to the placing of the weights Place the weights 2 50 8 mm in from an edge of the sample and 36 914 4 mm apart Apply 500 volts and take a reading five seconds after application of the voltage 2 For installed panels Place the weights 36 914 4 mm apart and at least 36 914 4 mm from any ground conn
16. 1000V Megohmmeter Model 1000N ESD Conductivity Test Kit Model 1100N USER MANUAL E SaD O Bat MEGOHMMETER e MODEL 1000N D OFF M v ON m UP X GUARD AEMC Limited Wa rranty The Megohmmeter Models 1000N and 1100N 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 unit has been tampered with abused or if the defect is related to service not performed by AEMC Instruments What AEMC Instruments Will Do If a malfunction occurs within the 1 year period you may return the instrument 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 registration card is not on file we will require a dated proof of purchase as well as your REGISTRATION CARD accompanied by the defective material REGISTER ON LINE AT www aemc com What You Must Do First request a return authorization form by phone or by fax from AEMC Instruments then return the instrument along with the signed authorization repair form 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
17. 2 X360 603 749 6434 X360 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 Table of Contents Warning 5t iet en teta eate tete 4 International Electrical Symbols 1 4 Megohmmeter Model 1000N 5 Receiving Your Shipment sse 5 Packaging oae oen eise C rep ctt eee rete in 5 Accessories and Replacement Parts 5 Description iecit erret te up ear dte deter eet 6 Specifications dme Re Eee dte Late 7 Control and Connector Identification 9 Battery Replacement u enn 10 AC Supply Module sse 10 Operation oco eds hence oae u T kaa 11 The Analog Seale aa aaa ieas 11 Preliminary Check 12 How to use the Push to Measure Button 12 Utilizing the Guard Terminal a 13 Voltage Measurements Safety Check 14 Audible Signal arinena i ei Eee ee eui deas 15 Precautions When Making DC Insulation Tests 15 Insulation Measurement Connections
18. 5100 Cat 2950 10 Replacement Leads for Model 1000 Coaxial shielded lead Cat 100 439 Set of leads one coaxial shielded lead pair of safety leads alligator clip and test probe Cat 100 482 Megohmmeter Model 1000N 1100N Description The AEMC Model 1000N Cat 185 100 is a portable multi range high sensitivity megohmmeter capable of measuring a wide range of insulation resistances from 1 kilohm to 1000 gigohms The Model 1000N has five test voltages of 50 100 250 500 and 1000V Each test voltage setting has two resistance ranges 1 to 1000MQ and 1 to 1000GQ In addition the Model 1000N has a unique low insulation test range of 1 to 1000kC with a constant current of 1mA maximum voltage of 1200VDc which is useful for testing old or flooded installations A voltmeter safety check with a range of 0 to 600V is standard The Model 1000N may be powered by either AC or DC DC power is supplied by eight 1 5V alkaline AA batteries As an option an AC line supply module and cord for 110 220VAC at 47 to 400Hz can be inserted in the battery compartment An audible signal consisting of approximately ten beeps per minute is present when the megohmmeter is ON and serves as a time base for tests of long duration A green LED when ON indicates that the batteries are good when the PUSH TO TEST button is depressed It also serves as a warning
19. ck The voltage at the parts marked with this symbol may be dangerous 4 Megohmmeter Model 1000N 1100N MEGOHMMETER MODEL 1000N Receiving Your Shipment Upon receiving your shipment make sure that the contents are consistent with the packing list Notify your distributor of any missing items If the equipment appears to be damaged file a claim immediately with the carrier and notify your distributor at once giving a detailed description of any damage Packaging The Megohmmeter Model 1000N Cat 185 100 is shipped with eight 1 5V AA batteries two color coded safety leads with insulated alligator clips a separate shielded lead a separate insulated alligator clip test probe one spare fuse carrying case and instruction manual Accessories and Replacement Parts AC power supply module with line cord and plug for switch selectable 110 220VAC at 47 to 400Hz Cat 100 142 Protective rubber case with handle Cat 2980 02 Rugged plastic carrying case 19 x 14 x 7 Cat 2118 07 Fuse set of five 0 1A slow blow for AC supply module Cat 100 438 Fuse set of one 0 3A for Model 1000 Cat 100 429 One test probe and one insulated alligator clip Cat 100 404 Replacement leads for Models 1000N 1100N 5000N Cat 1017 23 7 pin shielded lead 10 ft for Models 1000N 5000N
20. econds uF Scale Two large overlapping scales 4 7 119mm for each range Test Voltage Generation Solid state circuitry generating rated test voltage across the full range RESISTANCE TESTS Test Current Constant 1mA DC Kilohm Range 1 to 1000k 1MQ Maximum Test Voltage 1200VDC Accuracy 5 of reading typical CONTINUITY TESTS Resistance Range 0 1 to 1000 3O mid scale Accuracy 6 of reading Audible Tone Continuous for continuity resistances under 200Q Fuse High interrupting capacity 0 315A 29 Megohmmeter Model 1000N 1100N VOLTAGE TESTS SAFETY CHECK Voltage Range 0 to 600VAC DC Accuracy 3 of full scale GENERAL SPECIFICATIONS Audible Test Signal Ten beeps per minute constant tone for continuity resistance under 200Q Power Supply Eight 1 5V AA alkaline batteries NEDA 15A Typical battery life 350 one minute tests power consumed only when test button is depressed built in battery check by green LED Option 110 220V selectable 47 to 400Hz AC supply module Dielectric Test 4000VAC 50 60 Hz 1 minute Fuse Protection 0 3A high interrupting capacity fuse between line and guard terminals Meter Movement Rugged taut band suspension Dimensions 7 7 x 5 2 x 3 75 196 x 132 x 95mm Weight 2 2 Ibs 1 kg Temperature Range 23 to 122 F 5 to 50 C Case High impact gray polycarbonate Terminals Color coded safety terminals guard terminal eliminates surface leakage err
21. ections or grounded object resting on the floor sample described in General Notes 2 Apply 500 volts and take a reading five seconds after application of the voltage 3 Unless otherwise specified make five measurements on each floor section with the weights at different locations for each measurement and record the value of two significant figures see Figure 16 3952 Megohmmeter Model 1000N 1100N 4 Repeat the above procedure with the megohmmeter connected between one weight and a known electrical ground see Figure 17 In the case of an uninstalled floor sample as in step 1 the ground should be part of the sample panel In the case of an installed floor sample as in step 2 the ground should be a water pipe or known electrical ground Interchange the leads at the megohmmeter for each measurement and report the average value obtained as the value for that measurement 5 When finished turn off the megohmmeter and return it to the case Note If the resistance changes with time during a measurement the value observed after about 5 seconds shall be considered to be the measured value Table Top Electrodes GUARD EARTH MEGOHMMETER Figure 16 233 2 Megohmmeter Model 1000N 1100N Table Top Electrode Groundable Points LINE GUARD EARTH MEGOHMMETER Figure 17 Measurement Results Specific measurement results for each individual application of the Model 1100N are difficult to determine
22. eptacle 10 Megohmmeter Model 1000N 1100N OPERATION The Analog Scale Before taking any measurements verify that the pointer is zeroed correctly AC scale 0 If it is not adjust with the mechanical zero adjust screw The analog scale serves two functions First it indicates the actual resistance of the insulating material under test black scales The top scale is used for measurement on the MQ and GQ ranges The bottom half MQ covers the range of 1MQ to 1000M9 reading from left to right The upper portion of the scale GQ covers the range of 1GQ to 1000GQ and reads left to right The center scale is used for the low insulation test range of 1k to 1000k reading from right to left The bottom arc is an AC DC voltmeter which is divided into 10 volt increments The voltmeter function is operable any time the PUSH TO TEST button is out The voltmeter detects the presence of voltage on the equipment to be tested If voltage is detected do not proceed with the insulation test The voltmeter function also indicates if after completing insulation testing the sample under test has stored a dangerous capacitive charge The instrument discharges this capacitance internally and the needle will drop accordingly Disconnect the meter when the sample is discharged N Warning Electrical equipment and cables may have sufficient capacitance to store a dangerous charge from the instrument test current For proper discha
23. er which is essentially a high resistance ohmmeter MQ or greater providing a high DC potential up to 5000V This high potential causes low amounts of current to flow through and over the insulation which is under test Many factors can cause insulation to fail mechanical damage moisture heat foreign debris corrosion etc As time passes these factors combine to permit excessive current to flow through insulation at points where it would normally be blocked by the insulation resistance Usually the resistance on degrading insulation will drop gradually providing plenty of warning Other times it will drop suddenly as when it is immersed With periodic resistance tests and good record keeping it is possible to get an accurate picture of the insulation condition Insulation resistance testing is intended to indicate not only if equipment is bad but also whether it is becoming bad Resistance of many types of insulation can vary greatly with temperature The resistance data obtained should be corrected to the standard temperature for the class of equipment under test Please note that although we present information on test procedures values and recommended frequency of testing the manufacturer of your particular piece of equipment is the definitive source for testing parameters and procedures While we refer to commonly applied rules and practices every test will not be practical to each piece of electrical equipment in your facility
24. etc The Model 1000N is especially suited for this type of measurement due to high accuracy and resolution in the megohm and gigohm ranges Conductivity testers are important in any operation where the presence of electrostatic discharge charges poses a danger to personnel or the operation of electronic equipment There are several standards in the industry which may be referenced when performing ESD testing of conductive flooring or tiles Standard 99 Reduction in Electrostatic Hazard National Fire Protection Association Batterymarch Park Quincy MA 02269 Standard F 150 72 Electrical Resistance of Conductive Resilient Flooring American Society for Testing and Materials 1916 Race St Philadelphia PA 19103 Standard 4 EOS ESD Standard for Protection of Electrostatic Discharge Susceptible Items EOS ESD Association inc 201 Mill St Rome NY 13440 Additional standards and specific recommendations for your application may be obtained from equipment and flooring manufacturers 28 Megohmmeter Model 1000N 1100N Specifications INSULATION TESTS DC Test Voltages 50 100 250 500 1000V Megohm Ranges For each test voltage two direct reading ranges 1 to 1000MQ 10 to 10 Q 1 to 1000GQ 10 to 10 92 Short Circuit Current 5mA max Accuracy 5 of reading typical Charging Time MQ range 0 3 seconds uF GQ range 4 seconds uF Discharging Time Automatic discharge when test button is released 0 1 s
25. ffects of surface leakage across exposed insulation at one end of the cable Refer to the section Utilizing the Guard Terminal The cable should be disconnected at both ends to avoid leakage through switchboards and panels Conductor under test GUARD EARTH MEGOHMMETER Figure 8 16 Megohmmeter Model 1000N 1100N Conductor under test A GUARD EARTH MEGOHMMETER Figure 9 Figure 10 shows the connections to a transformer 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 grounded Winding under test Transformer grounding lug GUARD EARTH MEGOHMMETER Figure 10 eA s Megohmmeter Model 1000N 1100N Figure 11 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 resistance to ground at the same time By removing the jumpers readings can be made between the individual conductors and ground A Jumper B Jumper C GUARD EARTH MEGOHMMETER Figure 11 18 Megohmmeter Model 1000N 1100N Insulation Resistance Measurements on Motors LINE GUARD EARTH MEGOHMMETER
26. light when the instrument is in use indicating that the selected test voltage is present at the terminals Megohmmeter Model 1000N 1100N Specifications INSULATION TESTS DC Test Voltages 50 100 250 500 1000V Megohm Ranges For each test voltage two direct reading ranges 1 to 1000MO 1 to 1000GQ Short Circuit Current 5mA max Accuracy 5 of reading typical 15 of reading between 100 and 1000GQ on the 50V range Charging Time 1000 MQ range 0 3 seconds uF 1000 GQ range 4 seconds uF Discharging Time Automatic discharge when test button is released 0 1 seconds uF Scale Two large overlapping scales 4 7 119 mm for each range Test Voltage Generation Solid state circuitry generating rated test voltage across the full range RESISTANCE TESTS Test Current Constant 1mA DC Kilohm Range 1 to 1000kC 1MQ Maximum Test Voltage 1200VDC Accuracy 5 of reading typical CONTINUITY TESTS Resistance Range 0 1 to 100 3O mid scale Accuracy 6 of reading Audible Tone Continuous for continuity resistances under 2009 Fuse High interrupting capacity 0 3154 iq Megohmmeter Model 1000N 1100N VOLTAGE TESTS SAFETY CHECK Voltage Range 0 to 600VAC DC Accuracy 3 of full scale GENERAL SPECIFICATIONS Audible Test Signal Ten beeps per minute constant tone for continuity resistance under 2002 Power Supply Eight 1 5V AA alkaline batteries NEDA 15A Typical battery life 350 one min
27. ons we recommend that the megohmmeter be submitted to our factory service center at one year intervals for recalibration or as required by other standards For instrument repair and calibration Call 800 945 2362 X360 603 749 6434 Fax 603 742 2346 Chauvin Arnoux Inc d b a AEMC Instruments 15 Faraday Drive Dover NH 03820 USA Or contact your authorized distributor Costs for repair standard calibration and calibration traceable to N I S T are available Note All customers must call for a CSA before returning any instrument Technical and Sales Assistance If you are experiencing any technical problems or require any assistance with the proper use or application of this instrument please call our technical hotline Chauvin Arnoux Inc d b a AEMC Instruments Phone 800 343 1391 508 698 2115 Fax 508 698 2118 www aemc com 36 GJ AEMC INSTRUMENTS Chauvin Arnoux Inc d b a AEMC Instruments 15 Faraday Drive Dover NH 03820 USA www aemc com 99 MAN 100020 v7 01 02
28. ors 30 Megohmmeter Model 1000N 1100N Battery Replacement The Model 1100N is powered by eight 1 5V AA batteries To replace the batteries disconnect the instrument from any circuits verify the PUSH TO TEST button is in the OFF position and proceed as follows e Unscrew the four standard screws on the four corners of the battery pack and remove the battery pack e Replace the batteries observing the proper polarities e Replace the battery case taking care not to pinch the connecting wire and tighten the four screws Access panel screws Access panel AC Supply Module The optional AC supply module Cat 100 142 provides power to the Model 1100N at 110 or 220VAc The AC power supply module is designed to plug into the back portion of the instrument directly replacing the batteries The module is protected by a 0 1A slow blow fuse Note Cat 100 142 is supplied with 110V US plug e Unscrew the four screws on the corners of the back panel battery pack Disconnect and remove the battery pack Connect the AC supply module to the power supply connector e Place the AC supply module into the back of the instrument and tighten the four corner screws making sure not to pinch the wires of the power supply connector e With the tip of a screwdriver select the proper voltage with the 110 220 supply switch on the back panel of the AC supply module e Plug AC supply cord into the appropriate voltage
29. rge to occur the PUSH TO TEST button must be in the OFF position with the sample connected between the EARTH and LINE terminals On prolonged tests the PUSH TO TEST button may be locked in the ON position care should be taken in this mode that no damage is done if the instrument is left unattended 11 Megohmmeter Model 1000N 1100N Preliminary Check When the PUSH TO TEST button is in the OFF position the pointer should be on zero of the voltmeter scale and on three of the GQ scale If it is not use the mechanical zero adjust on the front of the instrument e Detach the leads from the instrument e Press the PUSH TO TEST button into the ON position The pointer should deflect completely to the far right of the scale The green neon Bat lamp should light up Note Ensure that the Bat light green does not go out at any point during the testing If the light does not illuminate stop the test and change the batteries before continuing Verify that NO VOLTAGE is present on the circuit to be tested How to Use the PUSH TO TEST Button OFF PUSH TO TEST button is in the raised position This is for measurement of AC or DC voltages safety check Note Do not depress the PUSH TO TEST button if voltage is present ON PUSH TO TEST button is depressed and held down for the duration of the test This is for insulation resistance tests LOCK IN PUSH TO TEST button is depressed and turned clockwise 90 to lock
30. ute tests power consumed only when test button is depressed built in battery check by green LED Option 110 220V selectable 47 to 400Hz AC supply module Dielectric Test 4000VAc 50 60Hz 1 minute Fuse Protection 0 3A high interrupting capacity fuse between line and guard terminals Meter Movement Rugged taut band suspension Dimensions 7 7 x 5 2 x 3 75 196 x 132 x 95mm Weight 2 2 Ibs 1 kg Temperature Range 23 to 122 F 5 to 50 C Case High impact gray polycarbonate Terminals Color coded safety terminals guard terminal eliminates surface leakage errors Megohmmeter Model 1000N 1100N Control amp Connector Identification P 1 E e S 54 nO ot 2 so C Bat MEGOHMMETER OFF M v MODEL 1000N ON m ee 7 ON ce aiz HO We s Analog Measurement Scale 2 Battery Power Indicator Green lamp ON indicates batteries are good when PUSH TO TEST button is depressed Audible beep is also emitted approximately every 6 seconds 3 Mechanical Zero Adjust Selection Switch GUARD terminal blue Used to minimize the effect of leakage current Also used for the 109 range 6 LINE terminal black Connects to the equipment to be tested 7 EARTH terminal green Connects to ground for insulation testing 8 PUSH TO TEST button Lock ON by turning button a quarter turn to the right OFF Position Voltmeter position ON Position Test position with voltage present at o
31. utputs Megohmmeter Model 1000N 1100N Battery Replacement The Model 1000N is powered by eight 1 5V AA batteries To replace the batteries disconnect the instrument from any circuits verify the PUSH TO TEST button is in the OFF position and proceed as follows Access panel eorewe e Unscrew the four standard screws on the four corners of the battery pack and remove the battery pack Access panel e Replace the batteries observing the proper polarities e Replace the battery case taking care not to pinch the connecting wire and tighten the four screws AC Supply Module The optional AC supply module Cat 100 142 provides power to the Model 1000N at 110 or 220VAC The AC power supply module is designed to plug into the back portion of the instrument directly replacing the batteries The module is protected by a 0 1A slow blow fuse Note Cat 100 142 is supplied with 110V US plug e Unscrew the four screws on the corners of the back panel battery pack e Disconnect and remove the battery pack e Connect the AC supply module to the power supply connector e Place the AC supply module into the back of the instrument and tighten the four corner screws making sure not to pinch the wires of the power supply connector e With the tip of a screwdriver select the proper voltage with the 110 220 supply switch on the back panel of the AC supply module e Plug AC supply cord into the appropriate voltage rec
Download Pdf Manuals
Related Search