Manual - Test Equipment Depot
Contents
1. Dap AN P Ba MICROPROCESSOR CONTROLLED AUTO HOLD Test Current Range 1mA 20000 10mA 200 00 10mA 20 000 a 4o0mA __ 2000ma AC ft OF ud 100mA 200 0mo WO pc 20000 200 00 r 20 000 2000mO 200 0mo DIGITAL MILLIOHM METER orF rs KE SE C N10140 Current Injection Terminals Meet LVD amp EMC requirement Rotary Selector Switch Potential Injection Terminals Q Liquid Crystal Display Start Stop Test oS Q Over Temperature indicator Lit Over temperature or test stopped R O Resistance between the current leads too high fuse R O Resistance between the potential leads too high ACAUTION If NO TEST LED lit the current source is stopped MO 100 Milliohm Meter CONTENTS EN MBOUS EE 2 CAUTIONS AND PRECAUTIONS UNPACKING AND INSPECTION AAA 3 INTRODUCTION net MANLIUS eM EN er S 4 OPERATION onore teo dan tere E ene A Dad 6 Preparation For User terraniu RII EELER 6 Check the Battery emer EES A aIr TO vua Et tegen 6 Check the Current Regulation nennen 6 Check the Voltage Measurement nennen 6 Measuring BEA TES 7 uq 8 Supplied Potential Test Leads sssssssssseeseeeeeeneene nennen 8 Supplied Current Test Leads ccccecccececeeeeeceeeeeeeeeeeeeaeseeseeeeaeseeseeeeaeeeetenees 82. Test mur ape 99 Washington Street Depot WIERK y Phone 781 665 1400 1 800 517 8431 Toll Free 1 800 517 8431 AN AMPROBE MO 100 Milliohm Meter Users Manual Mode d emploi Bedienungshandbuch Manual d Uso Manual de uso AN AMPROBE IMO 100 Milliohm Meter Users Manual July 2009 Rev 1 2009 Amprobe Test Tools All rights reserved Printed in Taiwan Limited Warranty and Limitation of Liability Your Amprobe product will be free from defects in material and workmanship for 1 year from the date of purchase This warranty does not cover fuses disposable batteries or damage from accident neglect misuse alteration contamination or abnormal conditions of operation or handling Resellers are not authorized to extend any other warranty on Amprobe s behalf To obtain service during the warranty period return the product with proof of purchase to an authorized Amprobe Test Tools Service Center or to an Amprobe dealer or distributor See Repair Section for details THIS WARRANTY IS YOUR ONLY REMEDY ALL OTHER WARRANTIES WHETHER EXPRESS IMPLIED OR STAUTORY INCLUDING IMPLIED WARRANTIES OF FITNESS FOR A PARTICULAR PURPOSE OR MERCHANTABILITY ARE HEREBY DISCLAIMED MANUFACTURER SHALL NOT BE LIABLE FOR ANY SPECIAL INDIRECT INCIDENTAL OR CONSEQUENTIAL DAMAGES OR LOSSES ARISING FROM ANY CAUSE OR THEORY Since some states or countries do not allow the exclusion or limitation of an implied warranty or of incidental or cons
3. Thermal Effects SPECIFICATION ooo et teen ri re i di LL MA Re n e E LI io opa 10 Electrical zie RE Da OU Rem UH EE 10 Mechanical tisisiumeroosea enari AE COLONES OS es ead 10 Rated environmental conditions essent 11 MAINTENANCE AND REPAIR AAA 12 Battery Replacement 125i sender ev bsc Sanaa a ReR ERR HEP datka dai 12 Fus s Replacetmerit iubes redire e EO DS a D ne RE a ADEL TUR tne 13 SYMBOLS A Caution Refer to the explanation in this Manual A Caution Risk of Electric Shock Please remove all the test leads before performing maintenance A Cleaning battery replacement fuse replacement etc Conforms to relevant Australian standards CE Complies with European Directives Do not dispose of this clamp meter as unsorted municipal waste Contact a qualified recycler for disposal A WARNING Do not operate this instrument in the presence of gasoline natural gas propane or in other combustible atmospheres CAUTIONS AND PRECAUTIONS Refer to this manual before using the meter This instrument should only be used by a competent suitably trained person which fully understand the test amp measurement procedure Read the User s manual carefully and completely before using the instrument Fully understand the instructions before using this product Follow the instructions for every test Take all the necessary precautions Do not exceed the limits of thi
4. LCD will be sluggish AN Warning risk of electric shock UNPACKING AND INSPECTION Your shipping carton should include 1 1 1 1 1 If any MO 100 Milliohm Meter Shoulder Belt Test Lead Green Color Test Lead Red Color Test Lead Blue Color Test Lead Black Color Alkaline Battery SIZE AA 1 5V Spare Fuse 0 5A 250V User s Manual of the items are damaged or missing return the complete package to the place of purchase for an exchange INTRODUCTION The Milliohm Meter is a battery operated instrument wich supply a low current to the circuit under test with which stable accurate measurement of low resistance can be made still over a wide range of values Resolution on the lowest range is 100 ohm and on the highest range 1 ohm The meter has 5 measuring ranges from 200 0 milli ohm to 2000 ohms Measurements are displayed on a 21 digit custom liquid crystal display with large digits This instrument is powered from batteries only alkaline or rechargeable equivalent It has a regulated DC constant current source with current of 1mA 10mA and 100mA The instrument supply that current to the resistance being measured through the C1 and C2 terminals C1 being C2 being A The voltage drop across the resistance under test is measured by the potential terminals P1 and P2 P1 being P2 being Should the current regulation drops out the Rc LED will lit indicating that the r
5. equential damages this limitation of liability may not apply to you Repair All test tools returned for warranty or non warranty repair or for calibration should be accompanied by the following your name company s name address telephone number and proof of purchase Additionally please include a brief description of the problem or the service requested and include the test leads with the meter Non warranty repair or replacement charges should be remitted in the form of a check a money order credit card with expiration date or a purchase order made payable to Amprobe Test Tools In Warranty Repairs and Replacement All Countries Please read the warranty statement and check your battery before requesting repair During the warranty period any defective test tool can be returned to your Amprobe Test Tools distributor for an exchange for the same or like product Additionally in the United States and Canada In Warranty repair and replacement units can also be sent to a Amprobe Test Tools Service Center see address below Non Warranty Repairs and Replacement US and Canada Non warranty repairs in the United States and Canada should be sent to a Amprobe Test Tools Service Center Call Amprobe Test Tools or inquire at your point of purchase for current repair and replacement rates Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com MO 100 Milliohm Meter
6. esistance in the current circuit is too high Lowering the current by selecting a higher resistance range can solve the regulation Should the Rp LED lit that mean that the voltage measured on the resistance is too high and therefore over range The resistance is measured precisely when the RP and RC LEDs do not lit If anyone of these leds lit then the measurement can be inaccurate The meter has a built in custom 3Y2 digit liquid crystal display can be viewed in most lightning conditions This display indicates the differences conditions Hold m buzzer polarity condition of load or automatic decimal point change The instrument takes measurements for 10 seconds if the ON TEST Re button is depressed for less than 2 seconds If the same push button is pressed for more than 3 seconds the test will carry on for 60 seconds The tester switch OFF completely when the rotary switch is in the OFF position The tester Hold the last reading before stopping the test The tester is fuse protected and has a crowbar between C1 and C2 This crowbar is activated by voltage If the voltage is too high that crowbar will blow the fuse automatically to interrupt the circuit The voltage between P1 and P2 is also protected for over voltage but does not have a fuse The tester has a temperature shut down The temperature sensing is done on the current regulation transistor Should this over temperature LED lit allow the inst
7. ety plug which at one end have a crocodile alligator clip for connection to theresistance to be measured The other end plugs into the meter 4mm shrouded color coded sockets Supplied Current Test Leads e C1 test lead is of Green color shrouded 4mm safety plug which at one end have a crocodile alligator clip for connection to the resistance to be measured The other end plugs into the meter 4mm shrouded color coded sockets C2 test lead is of Black color shrouded 4mm safety plug which at one end have a crocodile alligator clip for connection to the resistance to be measured The other end plugs into the meter 4mm shrouded color coded sockets Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Thermal Effects Temperature can have a significant effect on the performance of a milliohm meter due to the temperature coefficient of the resistance under test and thermal EMF s across the dissimilar conductors Most conductors have a large temperature coefficient of resistance For example 0 4 C for copper A copper conductor that has a resistance of 10 00m ohm at 20 C will increase to 10 40m ohm at 30 C This change should be taken into account when making measurements Acurrent going through a resistance will also elevate its temperature So duration of the test can change the resistance When measuring the resistance of item such as current shunts which have
8. joints of dissimilar conductors thermal EMF can affect the accuracy of the measurement This condition can be detected if the reading alters when the leads are reversed To compensate for this effect the average of the two readings should be taken as the true measurement SPECIFICATION Electrical Measuring Ranges 0 200 0m ohms in steps of 10010 ohm 0 2000m ohms in steps of 1m ohm 0 20 00 ohms in steps of 10m ohm 0 200 0 ohms in steps of 100m ohm 0 2000 ohms in steps of 1 ohm Accuracy 0 5 of reading 2 digits over the Operating temperature range 15 C to 55 C with the supplied test leads Test Current 1mA gt 2000 ohms range 10mA gt 200 20 ohms ranges 100mA gt 2000m 200m ohms ranges Test Current Accuracy 0 196 Protection Fuses Supply 0 5 A HBC 5 x 20mm DIN Current 0 5 A HBC 5 x 20mm DIN Voltage 0 5 A HBC 5 x 20mm DIN Safety Complied with CE regulation Mechanical Case Size 110mm H X 250mm W X 190mm D Bump Test IEC68 2 29 Vibration Test IEC1010 clause 8 3 Drop Test IEC1010 clause 8 4 Impact Test IEC1010 Clause 8 2 Weight 1 542kg 10 Rated Environmental Conditions 1 Indoor Use 2 Pollution Degree 2 3 Altitude up to 2000 meter 4 Relative humidity 8096 max 5 Ambient temperature 0 C 40 C C EMC Conforms to EN61326 1 This product complies with requirements of the following European Community Directives 89 336 EEC Electro
9. magnetic Compatibility and 73 23 EEC Low Voltage as amended by 93 68 EEC CE Marking However electrical noise or intense electromagnetic fields in the vicinity of the equipment may disturb the measurement circuit Measuring instruments will also respond to unwanted signals that may be present within the measurement circuit Users should exercise care and take appropriate precautions to avoid misleading results when making measurements in the presence of electronic interference Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com MAINTENANCE AND REPAIR If there appears to be a malfunction during the operation of the meter the following steps should be performed in order to isolate the cause of the problem 1 Check the battery Replace the battery immediately when the symbol E 3l appears on the LCD 2 Review the operating instructions for possible mistakes in operating procedure Except for the replacement of the battery repair of the meter should be performed only by a Factory Authorized Service Center or by other qualified instrument service personnel The front panel and case can be cleaned with a mild solution of detergent and water Apply sparingly with a soft cloth and allow to dry completely before using Do not use aromatic hydrocarbons Gasoline or chlorinated solvents for cleaning BATTERY REPLACEMENT 1 Disconnect the test leads from the instrument and remove the ba
10. nt test leads The RC led should go off indicating that the current regulation is ok Check the Voltage Measurement Connect the potential leads to P1 and P2 Short the P1 and P2 The display should indicate 0000 Remove the short from P1 and P2and C1 and C2 Touching the potential test leads P1 to C1 and P2 to C2 the RP led should lit indicating an over voltage or over range This proving test can be repeated on all the ranges if need be You can also check the polarity indication of the milli voltmeter by touching the potential test leads P1 to C2 and P2 to C1 the RP LED should lit indicating an over voltage or over range The indicator should be indicating on the LCD showing the polarity change Total check can be done by shorting all the test leads together C1 C2 P1 P2 The display should indicate close to 0000 depending of the crocodiles clips used and how they are shorted Both RC and RP LED should be OFF indicating that everything work ok Measuring Perform the preliminary checks before proceeding with measurement and ensure that the precautions listed are observed Connect the test leads color coded to the instrument as shown The current test leads must always be outside of the potential test leads Please note that the shorter the potential test leads the better long potential test leads will pick up noise Screened test leads are recommended for better environmental noise rejection
11. rrent Circuit Fuse F2 Potential Circuit Fuse Fuse protection is provided on the potential terminals This fuse is situated under the Printed Circuit Board To access it you need to unscrew the four mounting screws which are holding the font panel Two of these screws are located under the foots and the two others are located inside the battery compartment The fuse is automatically blow by the crowbar should voltage be present on the resistance under test This is to prevent damage to the instrument If the preliminary tests does not lit R P this is indicative of this fuse being blown HBC 0 5A 250Vac Slow Blow Potential Circuit Fuse F1 Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com
12. rument to cool down for a while before proceeding further The milliohm meter with its measuring range of 100u ohms to 2000 ohms is suitable for a wide range of applications such as 1 Measuring the winding resistance of electric motors generators and transformers N Bond testing in mines aircraft railways ships domestic andindustrial wiring installations w Measuring the ring main continuity testing in industrial and domestic wiring installations 4 Measuring resistance in electronic equipment such as shunts pcb tracks switch and relay resistance ui Checking compression joints on overheads lines o Testing and maintenance of switchboard sub station equipment on such items as fuses joints contacts and bonds Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com OPERATION Preparation For Use When unpacked the tester should be inspected for any visible signs of damage and the preliminary checks described in the user s manual should be performed to ensure that it is operating correctly If there is any sign of damage or if the instrument does not operate correctly return it to your nearest supplier Check the Battery If the battery symbol is shown on the LCD then replace the batteries with new alkalines batteries before proceeding Check the Current Regulation Connect the current leads to C1 and C2 Select a range and short the curre
13. s instrument The tested circuit must be de energised and isolated before connections are made to it Do not use test leads probes or crocodiles aligators clips that are dirty damaged or have broken or cracked insulation Such accessories should be removed and repaired Immediately Always disconnect the test leads before replacing any fuse or battery Always replace the fuse with same type and rating ensure that they are correctly fitted on fuse terminals Double check the switch settings and leads connections before measuring Make a sketch to ensure proper operation and principle of measurement is correct and well understood Do not touch any exposed wiring connections or other live parts of an electrical circuit If in doubt check the circuit first for voltage before touching it Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Precautions Always ensure that the circuit to be measured is switched OFF isolated and completely de energized before connecting the test leads If it is probable that the instrument s protection has been impaired due to electrical mechanical or environmental damage it must not be used It should be returned to your nearest distributor or agent for checking and repair To prevent damage to the liquid crystal display the minimum storage temperature of 20 C must be observed It should also be noted that below 0 C the operation of the
14. ttery cover and the batteries 2 The tester s battery is situated under the tester 3 Replace with eight 1 5V AA light batteries taking care to observe correct polarity Alkaline batteries are recommended 4 Reinstall battery holder and the battery cover FUSES REPLACEMENT The maximum continuous voltage which can be applied across the potential and current leads is around 10 7V Applying more than that voltage will automatically blow their respective fuses However the crowbar trigger can be factory adjusted for your application We have specially selected that method to stop damaging the instrument should it be misused There are three fuses Power Supply Fuse The power supply fuse is situated under the tester Open the battery compartment and replace the fuse with the same type 0 5 A gt 24V Slow Blow Fuses 0 5A 250V Current Circuit Fuse Fuse protection is provided on the current terminals This fuse is situated under the Printed Circuit Board To access it you need to unscrew the four mounting screws which are holding the font panel Two os these screws are located under the foots and the two others are located inside the battery compartment The fuse is automatically blow by the crowbar should voltage be present on the resistance under test This is to prevent damage to the instrument It is indicative of this fuse being blown is the RC Led stays on HBC 0 5 A 250Vac Slow Blow Cu
15. warum EP rre ECCE MEME D Comp ress ion OB A Be Rb DC20V MICROPROCESSOR CONTROLLED AUTO HOLD Test Current Range ima 20000 TOMA 200 00 Ioma 20 00n R us Tooma 2000ma EE dl 20000 200 00 lamt 20 000 2000mO 200 0mo DIGITAL MILLIOHM METER orr Ce e X Test Leads The test leads supplied with the instrument are suitable for connecting to conductors up to 17mm in diameter or bus bars 17mm tick There will be instances where the item being measured require larger jaws and the user is advised to make up his own leads There will be occasions when longer leads are required due to the geometry of the item being tested Some guidance notes should as sit in the assembly of such leads Length of the potential leads should be as short as possible Insulated 16 0 2mm tinned copper wire is recommended The two potential leads should have the same length to minimize inaccuracies due to unbalance Supplied Potential Test Leads P1 test lead is of Red color shrouded 4mm safety plug which at one end have a crocodile alligator clip for connection to the resistance to be measured The other end plugs into the meter 4mm shrouded color coded sockets P2 test lead is of Blue color shrouded 4mm saf
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