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Contents
1. ss Charger socket input voltage Charger socket input current Battery charging current Overvoltage category Protection classification Pollution degree Protection degree DISDISV ra Dimensions w x h x d WEINE e uoc eun Reference conditions Reference temperature range Reference humidity range Operation conditions Working temperature range Maximum relative humidity Storage conditions Temperature range Maximum relative humidity Nominal altitude RS232 interface 39232 connector USB interface cere ececechcacacuchicacaduchics USB COMMECIOR vacicccadeveccvavavevcvevevens MEMO ACORN NTOERHONE Real time clock error Maximum lead resistance Technical specification 9 Vpc 6x1 5 V battery or accu size AA gt 25h gt 800 measurements of 500 mQ load 2 A test current amp 15 s measurement duration 12 V 10 96 400 mA max 250 mA internally regulated 600 V CAT III 300 V CAT IV double insulation 2 IP 40 128 x 64 dots matrix display with backlight 14 cm x 8 cm x 23 cm 0 8 kg without battery cells and accessories 25 C 5 C 402. MicroOhm 2A MI 3242 Instruction manual Version 1 0 Code no 20 752 011 S METREL Distributor Manufacturer METREL d d Ljubljanska cesta 77 1354 Horjul Slovenia web site http www metrel si e mail metrel metrel si O 2012 METREL No part of this publication may be reproduced or utilized in any form or by any means without permission in writing from METREL MI 3242 MicroOhm 2A Table of contents Table of contents t General descriptio ui eon Ove Io XO Eo Eu Uv aa Exe EMO HOME REN VOR Dr HEX REN OR ED NE IE SERRA EDS 5 1 1 Fe SLU S POCA T E 5 2 Safety and operational considerations eee eene een 6 2 1 Warnings and notes usada 6 22 Battery ANG CHANGING wusicedvonivstivoutawiddoniesteventoetiveninudiveniesieceulosuiaselastdesnivotucudeowss 8 2 2 1 New battery cells or cells unused for a longer period cooccccocccccnoconiconnncanonos 9 2 9 otandardas ap pile a a 10 3 Instrument descripcion ii di 11 3 1 Wires Sin cl TNR 11 Re COMMECIOR AMC RU T T MT 12 9 9 Barea AA 13 A A 14 o0 Display Orgaz a O ens e eeen E ET E E E 15 Battery and time INdIiCati0N ooccocncocnoonnconnccnnconoconononononononcnncnanonanonanonaninanonns 15 3 9 2 MESSA0C Ei tM PENES 15 3 5 3 HeD SGre cM 16 3 5 4 Backlight and contrast adjustments esses essen een nnns 17 4 Instrument operatio sc eset edes vos AAA E SDN
3. DOWN TAB MEM Exits back to measurements field without changes FUNCTION l SELECTOR Exits back to Main menu without changes DELETE FESULTS OBJECT eel Loci Baz LOC BIA Ho 242 CLEAR RESULT Figure 7 10 Dialog for confirmation 35 MI 3242 MicroOhm 2A Communication 8 Communication The instrument can communicate with the HVLink PRO PC software The following action is supported gt Saved results can be downloaded and stored to a PC A special communication program on the PC automatically identifies the instrument and enables data transfer between the instrument and the PC There are two communication interfaces available on the instrument USB or RS 232 he instrument automatically selects the communication mode according to the detected interface USB interface has priority How to transfer stored data R9 232 communication connect a PC COM port to the instrument PS 2 connector using the PS 2 RS232 serial communication cable USB communication connect a PC USB port to the instrument USB connector using the USB interface cable owitch on the PC and the instrument Run the HVLink PRO program The PC and the instrument will automatically recognize each other The instrument is prepared to download data to the PC Note a USB drivers should be installed on PC before using the USB interface Refer to USB installation instructions available on installation CD 36 MI 3242 MicroOhm 2A Maintenance 9
4. RH 70 RH 0 C 40 C 95 RH 0 C 40 C non condensing 20 C 70 C 90 RH 10 C 40 C 80 RH 40 C 60 C up to 2000m 115200 bps 1 start bit 8 data bits 1 stop bit PS 2 connector female 256000 bps type B 1500 storage locations 512 kB 50 ppm 100 mQ total C1 and C2 40
5. charged discharged Actual decreasing of capacity versus number of charging cycles depends on battery type This information is provided in the technical specification from battery manufacturer MI 3242 MicroOhm 2A Safety and operational considerations 2 3 Standards applied The MicroOhm 2A instruments are manufactured and tested in accordance with the following regulations Electromagnetic compatibility EMC EN 61326 Electrical equipment for measurement control and laboratory use EMC requirements Class A Safety LVD EN 61010 1 oafety requirements for electrical equipment for measurement control and laboratory use Part 1 General requirements EN 61010 2 030 Safety requirements for electrical equipment for measurement control and laboratory use Part 2 030 Particular requirements for testing and measuring circuits EN 61010 031 Safety requirements for electrical equipment for measurement control and laboratory use Part 031 Safety requirements for hand held probe assemblies for electrical measurement and test Note about EN and IEC standards a Text of this manual contains references to European standards All standards of EN 6XXXX e g EN 61010 series are equivalent to IEC standards with the same number e g IEC 61010 and differ only in amended parts required by European harmonization procedure 10 MI 3242 MicroOhm 2A Instrument description 3 Instrument description 3 1 Front panel The opera
6. Resistance measurement ranges and accuracy Test current accuracy 10 smoothed DC Test duration 1 s single mode Test MCN OG saser 4 wire measurement Note a All data regarding accuracy is given for nominal reference environment condition and forward and reverse measurements a Inductive mode will introduce an undefined error if an EMF is present on the test object a The error in operating conditions could be at most the error for reference conditions specified in the manual for each function 0 1 of measured value 1 digit unless otherwise specified in the manual for particular function Noise rejection 50 60 Hz on potential leads P1 P2 Additional error 1 4 mm R lt 500 m AA AR 100 mA 70 mArms Rx 10 Q lt 0 5 7 mArvs R lt 100 Q 38 MI 3242 MicroOhm 2A Technical specification 10 2 Measurement parameters 100 mA Max power output Output voltage 1 pO 199 9 Q Table 10 2 Measurement parameters 10 3 Voltage and frequency 10 3 1 Voltage PROS UIE Den das True r m s trms Nominal frequency range 0 Hz 14 Hz 500 Hz 10 3 2 Frequency Measuring range Hz Resolution Hz 10 0 99 9 0 100 500 qon Nominal voltage range 10V 550 V 39 MI 3242 MicroOhm 2A 10 4 General data Power supply voltage die state ERE EE REPRE Measurements
7. co RS OP eO RUE 18 4 1 wipes TT TI TT IM UmT 18 5 SENOS Men Unison 19 91 SEIS CHO MAN UAC Cc eoe Cem Cre cem tee tune tanium ende em ee e Ue aed 19 D A a EE EE EEEE5 5m pu EA ES Ea 20 S9 UIS oorr SR RE EINE MM EI MM RM MEME Iu 20 5 4 M jg E 21 S SOMA Cale ANG WMG M mU 21 ZO INSTUMENCINIO naasa cici n 22 6 Measurement nidad i n 23 6 1 Four wire Kelvin MethOd occocconioncoccocconioniononoocoononnonnononnonnonnononrennennonennennennos 23 6 2 Resistance MeasureMent coccoccocioncccocconioncnnoncnconnonnononnonnoncononnannonnonenrennennononos 24 6 2 1 OE MOJO Rene aR MO Re du le MM EI Md MA de 25 6 2 2 CONUNUOUS OG Er tes aiii 26 6 2 3 PROMO MV OO Cu AS 2 6 2 4 MUWE MOGE rene tabu touc ak O bio 28 6 9 Voltage LISMS wccorsvotavetevertestdonbneteutduotincyincuinusetoulesulueuiusizasticuletoueniveulemiusion 29 Data TRAINING esos ioo Eton bas aive ue soon aav dad 30 7 1 Memon org anizaUOi eR EE T 30 e DAS TII LI S SLM IURI a eee 30 Lo o lila le est TOS ll S aseene a 31 TA Recallng est FesullS sies e eH TREES EE HE De o E REDE e Eoo pA ee 32 LoS Clearing Stored data pai A IA A datado 33 1 5 1 Clearing complete memory content o oocccocccccnccconoconcconnononnonononanonannonannnannononnnnns 33 5 2 Clearing measurement s in selected loOCati0N o ccooccccnniconoconncconecononennnnnos 34 3 MI 3242 MicroOhm 2A Table of contents 1 5 3 Cle
8. object automatic discharge may not be done immediately Do not connect test terminals to external voltage higher than 600 V AC or DC in order not to damage the test instrument Notes related to measurement functions General a Warning 4 will appear on screen and the resistance test will not be performed if voltages higher than 8 V AC or DC are detected between test terminals There will be no warning if all terminals are at the same potential a PASS FAIL indication is enabled when limit is set Apply appropriate limit value for evaluation of measurement results WARNING OUT OF MEMORY The internal memory is full MI 3242 MicroOhm 2A Safety and operational considerations 2 2 Battery and charging The instrument uses six AA size alkaline or rechargeable Ni MH battery cells Nominal operating time is declared for cells with nominal capacity of 2100 mAh Battery condition is always displayed in the lower right display part In case the battery is too weak the instrument indicates this as shown in figure 2 1 This indication appears for a few seconds and then the instrument turns itself off Figure 2 1 Discharged battery indication The battery is charged whenever the power supply adapter is connected to the instrument The power supply socket polarity is shown in figure 2 2 Internal circuit controls charging and assures maximum battery lifetime Figure 2 2 Power supply socket polarity The instrument automa
9. small objects or very long for the larger high inductive objects Before the desired current for testing purpose can flow this energy requirement must be met W 1 2xLxI17 Inductive measurement l t plot Test 4 Start Stop p gt E i te ta t UA ADC p gt t Figure 6 8 Inductive Mode tc charging time depends on the size of the inductor td discharging time Note a The Inductive Mode can be primarily used for measuring Motor amp generator winding Power transformers Power inductors gt Wire and cable resistance Warnings a Do not touch the test object during the measurement or before it is fully discharged Risk of electric shock a When aresistance measurement has been performed on an inductive object automatic discharge may not be done immediately a High voltage can appear on test terminals when measuring inductive object 28 MI 3242 MicroOhm 2A Measurements 6 3 Voltage TRMS It is a simple function that continuously measures the voltage and frequency across C1 P1 C2 P2 connector Measured voltage and frequency in function VOLTAGE TRMS can be stored Test circuit for voltage measurement L2 4 gt E e ds T A o N mi LJ e N ufo summon umo mum summo mms SD UIT POIDS UN PD E UI e o lc ld m jn s mo o e PE Figure 6 9 Voltage TRMS connection Voltage TRMS procedure Select the VOLTAGE TRMS function
10. FUNCTION SELECTOR Returns to Main menu without changes Warning a Ifthe batteries are removed for more than 1 minute the set time and date will be lost 21 MI 3242 MicroOhm 2A Settings menu 5 6 Instrument info In this menu the following instrument data is shown instrument type model number firmware and hardware version Serial number calibration date INSTRUMENT INFO Figure 5 8 Instrument info menu Keys FUNCTION SELECTOR Returns to Main menu I TEST 22 MI 3242 MicroOhm 2A Measurements 6 Measurements 6 1 Four wire Kelvin method When measuring resistance 20 Q it is advisable to use a four wire measurement technique Figure 6 1 for achieving high accuracy By using this type of measurement configuration the test lead resistance is not included in the measurement and the need for lead calibrating and balancing is eliminated Rwire Figure 6 1 Four wire Kelvin method The measuring current is passed through the unknown resistance Rx using the C1 and C2 leads The placing of these leads is not critical but should always be outside the P1 and P2 leads The Voltage drop across the Rx is measured across P1 and P2 and these should be placed exactly at the points to be measured Note about poor connection a Most measurement errors are caused by poor or inconsistent connection of the object under test It is essential to ensure that the device under test has clean oxide and dirt fre
11. Insert the test lead connector in to the instrument Connect test probes or crocodile clips on C1 P1 and C2 P2 and connect it to the measuring points see figure 6 9 otore the result by pressing MEM key optional Figure 6 10 Voltage TRMS test result 29 MI 3242 MicroOhm 2A Data handling 7 Data handling 7 1 Memory organization Measurement results together with all relevant parameters can be stored in the instrument s memory After the measurement is completed results can be stored to the flash memory of the instrument together with the sub results and function parameters 7 2 Data structure The instruments memory place is divided into 3 levels each containing 199 locations The number of measurements that can be stored into one location is not limited RECALL RESULTS OBJECT Hil L CI Bae LOC aid Mo 1 4 WOLTAGE Figure 7 1 Data structure and measurement fields Data structure field Memory operation menu OBJECT bel 3 Loci g Data structure field LOC Bg a 1 level OBJECT aa OBJECT Default location name object and its successive number a 2 level Number of Results a 3 level Number of Results L C1 mu L Cz WB Measurement field No of selected test result No of all stored test results in selected location VOLTAGE Type of stored measurement in the selected location Ho 1 4 30 MI 3242 MicroOhm 2A Data handling 7 3 Storing test results After the comple
12. Maintenance Unauthorized persons are not allowed to open the MicroOhm 24A instrument There are no user replaceable components inside the instrument except the battery Warning a A Disconnect all measuring accessory and switch off the instrument before opening battery cover 9 1 Cleaning No special maintenance is required for the housing To clean the surface of the instrument use a soft cloth slightly moistened with soapy water or alcohol Then leave the instrument to dry totally before use Warnings a Do not use liquids based on petrol or hydrocarbons a Do not spill cleaning liquid over the instrument 9 2 Periodic calibration It is essential that the test instrument is regularly calibrated in order that the technical specification listed in this manual is guaranteed We recommend an annual calibration Only an authorized technical personnel can do the calibration Please contact your dealer for further information 9 3 Service For repairs under warranty or at any other time please contact your distributor 37 MI 3242 MicroOhm 2A Technical specification 10 Technical specifications 10 1 Resistance measurement Test current Resistance range Resolution Accuracy 0 000 9 999 mQ 1 uQ 2A 10 00 99 99 mQ 10 uQ 100 0 999 9 mQ 100 uQ 99 99 MO 0 999 9 mO 100 mA J 9999 Q 0 25 of reading 2 digits 19990 0 999 9 mO 1 000 9 999 Q ae 10 00 99 99 Q 100 0 19990 Table 10 1
13. arging in progress if power supply adapter is connected DE 26 Time indication hh mm Warning a Ifthe batteries are removed for more than 1 minute set time and date will be lost and Initial settings will be restored Note a Date and time is attached to each stored result 3 5 2 Message field In the message field warnings and messages are displayed Test result can be saved High voltage is present on terminals Measurement in progress 15 MI 3242 MicroOhm 2A Instrument description P1 P2 C1 or C2 terminal is not connected to the instrument or too high resistance is detected Low test current test current is out of defined limits Iset 10 Measurement result is within defined limits Measurement result is out of defined limits Measurement result is out of defined high limit Measurement result is out of defined low limit KFK S ma B 3 5 3 Help screens HELP Opens help screen Help menus are available in all functions The Help menu contains schematic diagrams for illustrating how to properly connect the instrument to the test object Press the HELP key in order to view the associated Help menu Keys in help menu UP DOWN Selects next previous help screen Function selector HELP Exits help menu HELP LM WINDING Figure 3 7 Examples of help screens 16 MI 3242 MicroOhm 2A Instrument description 3 9 4 Backlight and contrast adjustments With the BACKLIGHT EX key back
14. aring individual measurements oooccoccccccccconononncocnononnnconononnnonnononnonnnnnannnnononons 34 9 MalmenanCOr ER Ce eee we to is ais 37 IT 212 1019 mm mE 37 9 2 mi iiieelesezisgie s TTE 37 9 3 A M IM MM MM I E ELI A A 37 10 Technical SPecifica ton iii 38 10 1 Resistance measurement sssssssesem I III mem meh mehrerer eere nenne 38 10 2 Measurement parameters isisisi aa aa aaa 39 103 Voltage and TrequerieyLcu eene E E MEE UTERET eee es 39 JUN mn T oct 39 103 2 EAU CV esiroii aue b dores uitae neh eee aduana Fev dentutisakue uS tippen Deanna 39 104 General dala vet Pestvuscd Secauwdt A duae d Feud rac Rexe tasa Vus d Vedi A 40 MI 3242 MicroOhm 2A General description 1 General description 1 1 Features MI 3242 MicroOhm 2A is a portable lightweight 1 5 kg bidirectional low resistance ohmmeter using four wire Kelvin method to measure low resistances of Switches Relays Connectors Bus bars Power distribution cable joints Motor amp generator winding Power transformers Power inductors Rail track joints Wire and cable resistance Welding joints VV VVVVVVV VV The instrument is designed and produced with the extensive knowledge and experience acquired through many years of of working in this sector Available functions offered by the MicroOhm 2A meter Resistance measurement Four wire Kelvin method High Resolution 24 Bit 2 A ADC Wide measuring range 1 uQ 199 9 O Adjustable te
15. by pressing MEM key optional 24 MI 3242 MicroOhm 2A Measurements E inductive 16 mA 1 781 Tx 161 mA Figure 6 4 Examples of Resistance measurement results Note a Consider displayed warnings when starting the measurement 6 2 1 Single Mode Single mode makes a single bidirectional measurement The instrument will measure resistance in both directions thermal EMF elimination The main result displayed on the display is an average R ATR Single measurement l t plot Test Start gt E gt u ADC ADC E t Figure 6 5 Single Mode Note a The Single Mode can be primarily used for measuring Relays gt Switches gt Connectors gt Bus bars gt Power distribution cable joints gt Welding joints 25 MI 3242 MicroOhm 2A Measurements 6 2 2 Continuous Mode Continuous mode makes continuous bidirectional measurements The instrument will measure resistance in both directions thermal EMF elimination and repeating the measurements until the TEST key will be pressed The main result displayed on the R R display is an average of the last bidirectional measurement R oe The measurement is started and stopped by the user Continuous measurement l t plot Test 4 Start Stop E i t UA ADC ADC ADC ADC p t Figure 6 6 Continuous M
16. e contacts High resistance connection will cause errors and may prevent the selected current to flow because of the high resistance of C1 C2 loop Note a Ohm s law states that the current through a conductor between two points is directly proportional to the potential difference or voltage across the two points and inversely proportional to the resistance between them The mathematical equation that describes this relationship is U Volt R lohm U Volt pee Amer gt Rx ohm 23 MI 3242 MicroOhm 2A Measurements 6 2 Resistance measurement Test can be started from the Resistance window Before carrying out a test the parameters Mode and Current can be edited Figure 6 2 Resistance menu Test parameters for Resistance measurement Sub function Single Continuous Auto Inductive Test current 2 A 100 mA 10 mA Keys TAB Selects the field to be changed Alvy Modifies selected field TEST Start the resistance measurement Test circuits for Resistance measurement C1 P1 Rx P2 C2 Figure 6 3 Resistance measurement connection Resistance measurement procedure Select the RESISTANCE function Set the test parameters mode and test current Set limits optional See chapter 5 3 Limits settings Connect device under test to the instrument see figure 6 3 Press the TEST key to start the measurement Press the TEST key to stop the measurement not used in single mode Store the result
17. e significantly reduced during the initial charging discharging cycles of the batteries In this situation Metrel recommend the following procedure to improve the battery lifetime Procedure Notes gt Completely charge the battery At least 14h with in built charger This can be performed by using the gt Completely discharge the battery instrument normally until the instrument is fully discharged gt Repeat the charge discharge cycle Four cycles are recommended in order to at least 2 4 times restore the batteries to their normal capacity Notes a The charger in the instrument is a pack cell charger This means that the battery cells are connected in series during the charging The battery cells have to be equivalent same charge condition same type and age a One different battery cell can cause an improper charging and incorrect discharging during normal usage of the entire battery pack it results in heating of the battery pack significantly decreased operation time reversed polarity of defective cell a If no improvement is achieved after several charge discharge cycles then each battery cell should be checked by comparing battery voltages testing them in a cell charger etc lt is very likely that only some of the battery cells are deteriorated a The effects described above should not be confused with the normal decrease of battery capacity over time Battery also loses some capacity when it is repeatedly
18. light and contrast can be adjusted Click Toggles backlight intensity level Locks high intensity backlight level until power is turned off or the key is pressed again Keep pressed for 2s Bargraph for LCD contrast adjustment is displayed Keep pressed for 1 s LCD CONTRAST E Figure 3 8 Contrast adjustment menu Keys for contrast adjustment DOWN Reduces contrast UP Increases contrast TEST Accepts new contrast BACKLIGHT X Exits without changes 17 MI 3242 MicroOhm 2A Instrument operation 4 Instrument operation 4 1 Function selection For selecting test function the FUNCTION SELECTOR shall be used Keys Select test measurement function E RESISTANCE Resistance measurement VOLTAGE TRMS gt Voltage and frequency measurement SETTINGS General instrument settings UP DOWN Selects sub function in selected measurement function TAB Selects the test parameter to be set or modified TEST Runs selected test measurement function Keys in test parameter field UP DOWN Changes the selected parameter TAB Selects the next measuring parameter FUNCTION SELECTOR Exits test parameter field selection 18 MI 3242 MicroOhm 2A Settings menu 5 Settings menu In the Settings menu different parameters of the instrument can be viewed or set SETTINGS 11 35 INITIAL SETTINGS LIMITS SETTINGS MEMORY SET DATE TIME Figure 5 1 Settings menu Keys UP DOWN Select the setting to adju
19. mits Figure 5 4 Limits settings menu Parameters for Limits settings Limit Hi Resistance limit value DFF 1 00 uQ 10 00 pO 20 0 uQ 100 0 pO Limit Lo 0 200 mQ 1 000 mQ 2 00 mQ 10 00 mQ 20 0 mQ 100 0 mQ 0 200 Q 1 000 Q 2 00 Q 10 00 QO 20 0 Q 200 0 Q Keys UP DOWN Selects the High or Low limit to be modified TEST Enters Limits modification screen FUNCTION SELECTOR Returns to Main menu without changes Figure 5 5 Limits modifications 20 MI 3242 MicroOhm 2A Settings menu Keys in Limits modifications screen UP DOWN Modifies selected limit MEM Save selection and returns to Limits Settings menu FUNCTION SELECTOR Returns to Main menu without changes Note a Limits won t be saved if Hi limit value is lower than Lo limit value Not valid limits message will appear on screen during saving limits process 5 4 Memory Stored results can be recalled or deleted in this menu DELETE RESULTS CLEAR ALL MEMORY Figure 5 6 Memory menu Keys UP DOWN Selects option TEST Enters selected option FUNCTION SELECTOR Returns to Main menu without changes See chapter 7 Data handling for more information 5 5 Setting date and time Date and time can be set in this menu DHTE TIHME 11145 EE 28 2818 Figure 5 7 Date and time menu Keys TAB Selects the field to be changed UP DOWN Modifies selected field TEST Confirms selection and returns to Settings menu
20. oc1 Loc2 UP DOWN Selects number of selected location element 1 to 199 TEST Enters dialog box for deleting all measurements in selected location and its sub locations ons Had Exits back to Main menu without changes MEM Enters measurements field for deleting individual measurements Keys in dialog for confirmation to clear results in selected location TEST Deletes all results in selected location UP DOWN TAB MEM Returns to structure field without changes FUNCTION SELECTOR Exits back to Main menu without changes 7 5 3 Clearing individual measurements Select DELETE RESULTS in MEMORY menu DELETE FESULTS OBJECT ae Loci Baz LOC aid Ho 1 175 WOLTAGE Figure 7 9 Menu for clearing individual measurement measurement field selected Keys in delete results menu structure field selected TAB Selects the location element Object Loc1 Loc2 UP DOWN Selects number of selected location element 1 to 199 MEM Enters measurements field TEST FUNCTION Exits back to Main menu SELECTOR 34 MI 3242 MicroOhm 2A Data handling Keys in delete results menu measurements field selected UP DOWN Selects measurement TEST Opens dialog box for confirmation to clear selected measurement TAB Returns to structure field FUNCTION SELECTOR Exits back to Main menu without changes Keys in dialog for confirmation to clear selected result s TEST Deletes selected measurement result UP
21. ode Note a The Continuous Mode is especially helpful for troubleshooting 26 MI 3242 MicroOhm 2A Measurements 6 2 3 Auto Mode Automatic mode makes a single bidirectional measurement The instrument will measure resistance in both directions thermal EMF elimination and started a single measurement every time the P1 P2 C1 and C2 are connected to the test object The main result displayed on the display is an average of the last bidirectional measurement R R 2 To make another measurement simply break and remake contact with the test sample R Automatic measurement l t plot Test Start Stop gt t u A P1 P2 C1 C2 OK P1 P2 C1 C2 OK P1 P2 C1 C2 OK x t A p t UA ADC ADC ADC ADC p t Figure 6 7 Automatic Mode Note a The Automatic Mode can be primarily used for measuring Bus bars Note about thermal EMF A junction between two different metals produces a voltage related to a temperature difference thermocouple MicroOhm 2A eliminates the thermal EMF effect by measuring resistance in both directions I and l 27 MI 3242 MicroOhm 2A Measurements 6 2 4 Inductive Mode Inductive mode makes a single unidirectional measurement lt is intended for measuring resistance on inductive objects Depending on the size of the inductive object testing times could be very short for
22. side belt 2 Battery compartment cover 3 Fixing screw for battery compartment cover 4 Back side information label 5 Holder for inclined position of the instrument Figure 3 4 Battery compartment Legend 1 Battery cells Size AA alkaline or rechargeable NiMH 2 Serial number label 13 MI 3242 MicroOhm 2A Instrument description 3 4 Accessories The accessories consist of standard and optional accessories Optional accessories can be delivered upon request See attached list for standard configuration and options or contact your distributor or see the METREL home page http www metrel si Figure 3 5 Standard set of the instrument Instrument MI 3242 MicroOhm 2A Test lead 2 5 m 1 pcs black red Crocodile clip 4 pcs black red Test probe 2 pcs black omall soft carrying bag oet of NiMH battery cells 6pcs Power supply adapter RS232 PS2 serial cable USB cable PC SW HVLink PRO Instruction manual on CD Calibration certificate VV VV VV VV VV V WV 14 MI 3242 MicroOhm 2A Instrument description 3 9 Display organization zinele Function name Result field JA Test parameter field display Battery and time indication 3 5 1 Battery and time indication The indication indicates the charge condition of battery and connection of external charger Battery capacity indication Low battery l Battery is too weak to guarantee correct result Replace or recharge the battery cells l Rech
23. st current 10 mA 2 A Hi Lo limits Automatic thermal EMF elimination Noise rejection 50 60 Hz Four different measuring modes single continuous inductive automatic USB and RS232 communication TRMS voltage meter VN VVVVVVV N High over voltage category CAT III 600V A 128x64 dot matrix LCD offers easy to read results and all associated parameters The operation is straightforward and clear to enable the user to operate the instrument without the need for special training except reading and understanding this Instruction Manual Test results can be stored on the instrument PC software HVLink PRO that is supplied as a part of standard set enables transfer of measured results to PC where can be analysed or printed MI 3242 MicroOhm 2A Safety and operational considerations 2 Safety and operational considerations 2 1 Warnings and notes In order to maintain the highest level of operator safety while carrying out various tests and measurements Metrel recommends keeping your MicroOhm 24A instruments in good condition and undamaged When using the instrument consider the following general warnings a The A symbol on the instrument means Read the Instruction manual with special care for safe operation The symbol requires an action If the test equipment is used in a manner not specified in this user manual the protection provided by the equipment could be impaired Read this user manual carefully o
24. st or view SELECT LANGUAGE gt instrument language INITIAL SETTINGS factory settings LIMITS SETTINGS limit values selection MEMORY to recall or clear stored results SET DATE TIME gt date and time INSTRUMENT INFO basic instrument information TEST Confirms selection FUNCTION Returns to the Main menu SELECTOR 5 1 Selection language The instrument language can be set in this menu SELECT LANGUAGE ENGLISH SLOVENSKO DEUTSCH ESPAROL i Figure 5 2 Language menu Keys UP DOWN Selects the language TEST Confirms selection and returns to Settings menu FUNCTION SELECTOR Returns to Main menu without changes 19 MI 3242 MicroOhm 2A Settings menu 5 2 Initial settings In this menu the following instrument parameters can be set to their initial values all measurement parameters LCD settings gt language INITIAL SETTINGS Contrast Lariuade and Function E ae UE be set to default aE VES Figure 5 3 Initial settings menu Keys TAB Selects YES or NO Confirms selection TEST The instrument will restart with the default settings if YES is selected Returns to the Settings menu without changes if NO is selected FUNCTION SELECTOR Returns to Main menu without changes 5 3 Limits settings With High and Low limit the user is allowed to set limit resistance values Measured resistance is compared against those limits Result is validated only if it is within the given li
25. therwise the use of the instrument may be dangerous for the operator the instrument or for the equipment under test Do not use the instrument or any of the accessories if any damage is noticed Consider all generally known precautions in order to avoid risk of electric shock while dealing with hazardous voltages Do not use the instrument in supply systems with voltages higher than 600 V Service intervention or adjustment is only allowed to be carried out by competent authorized personnel Use only standard or optional test accessories supplied by your distributor The instrument comes supplied with rechargeable Ni MH battery cells The cells should only be replaced with the same type as defined on the battery compartment label or as described in this manual Do not use standard alkaline battery cells while the power supply adapter is connected otherwise they may explode Hazardous voltages exist inside the instrument Disconnect all test leads and switch off the instrument before opening the battery compartment MI 3242 MicroOhm 2A Safety and operational considerations A Warnings related to measurement functions Resistance voltage and frequency measurements n n a a Resistance measurement should only be performed on de energized objects Do not touch the test object during the measurement or before it is fully discharged Risk of electric shock When a resistance measurement has been performed on an inductive
26. tically recognizes the connected power supply adapter and begins charging Symbols l Indication of battery charging I Figure 2 3 Charging indication a A When connected to an installation the instruments battery compartment can contain hazardous voltage inside When replacing battery cells or before opening the battery compartment cover disconnect any measuring accessory connected to the instrument and turn off the instrument a Ensure that the battery cells are inserted correctly otherwise the instrument will not operate and the batteries could be discharged a Ifthe instrument is not to be used for a long period of time remove all batteries from the battery compartment a Alkaline or rechargeable Ni MH batteries size AA can be used Metrel recommends only using rechargeable batteries with a capacity of 2100mAh or above a Do not recharge alkaline battery cells MI 3242 MicroOhm 2A Safety and operational considerations a Use only power supply adapter delivered from the manufacturer or distributor of the test equipment to avoid possible fire or electric shock 2 2 1 New battery cells or cells unused for a longer period Unpredictable chemical processes can occur during the charging of new battery cells or cells that have been left unused for a longer period more than 3 months Ni MH and Ni Cd cells can be subjected to these chemical effects sometimes called the memory effect As a result the instrument operation time can b
27. tion of a test the results and parameters are ready for storing icon is displayed in the information field By pressing the MEM key the user can store the results Figure 7 2 Save test menu FREE 106 6 Memory available for storing results Keys in save test menu data structure field TAB Selects the location element Object Loc1 Loc2 UP DOWN Selects number of selected location element 1 to 199 MEM Saves test results to the selected location and returns to the measuring menu FUNCTION Exits back to Main menu without saving SELECTOR Notes a The instrument offers to store the result to the last selected location by default a If the measurement is to be stored to the same location as the previous one just press the MEM key twice 31 MI 3242 MicroOhm 2A Data handling 7 4 Recalling test results Press the MEM key in a main function menu when there is no result available for storing or select MEMORY in the SETTINGS menu RECALL RESULTS OBJECT H l L CI Bae LOC Hid Mo 44 VOLTAGE Figure 7 3 Recall menu structure field Figure 7 4 Recall menu measurements selected field selected Keys in recall memory menu structure field selected TAB Selects the location element Object Loc1 Loc2 UP DOWN Selects number of selected location element 1 to 199 MEM Enters measurements field TEST FUNCTION Exits back to Main menu SELECTOR Keys in recall memory menu measuremen
28. tor s panel is shown in Figure 3 1 below Legend 1 LCD 4 TEST 5 UP 6 DOWN 7 MEM Function selector 9 Backlight Contrast 10 ON OFF 12 HELP 13 TAB 2 FAIL 3 PASS Figure 3 1 Front panel 128 x 64 dots matrix display with backlight Starts testing confirms selected option Modifies selected parameter Store recall tests in memory of instrument Selects test function Changes backlight level and contrast Switches the instrument power on or off The instrument automatically turns off 15 minutes after the last key was pressed Accesses help menus Selects the parameters in selected function Red indicator indicates PASS FAIL of result Green indicator 17 MI 3242 MicroOhm 2A Instrument description 3 2 Connector panel Figure 3 2 Connector panel Legend 1 Testconnector Measuring inputs outputs 2 Protection cover 3 Charger socket For connection of external charger 4 USB connector Communication with PC USB 1 1 port Communication with printer o PS 2 connector Communication with PC RS 232 port Warnings a Maximum allowed voltage between any test terminal and ground is 600 V a Maximum allowed voltage between test terminals is 600 V a Maximum short term voltage of external power supply adapter is 14 V a Use original test accessories only 12 MI 3242 MicroOhm 2A Instrument description 3 3 Back side a oO Figure 3 3 Back side Legend 1 Inserts for
29. ts field selected UP DOWN Selects the stored measurement TAB Returns to structure field MEM View selected measurement results TEST FUNCTION Exits back to Main menu SELECTOR RESISTANCE CONT PAi Figure 7 5 Example of recalled measurement result Keys in recall memory menu measurement results are displayed UP DOWN Displays measurement results stored in selected location MEM Returns to measurements field TEST FUNCTION Exits back to Main menu SELECTOR 32 MI 3242 MicroOhm 2A Data handling 7 5 Clearing stored data 7 5 1 Clearing complete memory content Select CLEAR ALL MEMORY in MEMORY menu A warning will be displayed CLEAR ALL MEMORY All saved results Will be lost Figure 7 6 Clear all memory Keys in clear all memory menu TAB selects YES or NO TEST Confirms clearing memory if YES is selected Exits back without changes if NO is selected FUNCTION Exits back to Main menu without changes SELECTOR CLEARING MEMORY iia Figure 7 7 Clearing memory in progress 33 MI 3242 MicroOhm 2A Data handling 7 5 2 Clearing measurement s in selected location Select DELETE RESULTS in MEMORY menu DELETE FESULTS DELETE FESULTS OBJECT eal gt LOC BB OBJECT Hil LOC Bid Figure 7 8 Clear measurements menu structure field selected Ho 3 CLEAR RESULTS Keys in delete results menu structure field selected TAB Selects the location element Object L
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