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1. cc s ccccceceesesscecececeeserseaeeeeecs 37 MRU 200 OPERATING MANUAL Version 4 6 3 6 POWER SUPPLY 1 2 1221020202000020000000002000000020000000200000000000000000000000000000002000 39 6 1 MONITORING OF THE POWER SUPPLY VOLTAGE 2 10 1 en eene 39 6 2 REPLACEMENT OF 8 1001 01 ee en eene emen ne eren 39 6 3 FUSE REPLACEMENT oain n OE A A ete pter 40 6 4 CHARGING OF 22 40 6 5 DISCHARGING OF ACCUMULATORS ceeeeeene e een en nen en eene 42 6 6 GENERAL PRINCIPLES REGARDING USING NI MH ACCUMULATORS 42 7 CLEANING AND MAINTENANCE eere esee tna ta tuse 43 8 jUOnrn 43 9 DISMANTLING AND DISPOSAL eere eese tna n statu atn statu aine ta senno 43 10 TECHNICAL DATA reser eee En ie 44 10 1 BASIE DATA oen R P dy inei 44 10 2 ADDITIONAL DATA eee ewent 47 10 2 1 Influence of the serial interference voltage Uz upon earth resistance measurements for functions 4P clamp esses 47 10 2 2 Influence of the serial interference voltage Uz upon earth resistance measurements for function p eese eene entrent een eene eene 47 10 2 3 Influence of the auxiliary electrodes upon earth resistance measurements for function
2. Adamaged meter which is completely or partially out of order Ameter with damaged test leads insulation A meter stored for an excessive period of time in disadvantageous conditions e g exces sive humidity If the meter has been transferred from a cool to a warm environment of a high level of relative humidity do not realise measurements until the meter has been warmed up to the ambient temperature approximately 30 minutes Before measurements may commence make sure the test leads are connected to the appropri ate measurement sockets Do not operate a meter with an open or incorrectly closed battery accumulator compartment or power it from other sources than those specified in the present manual The meter s inputs are electronically protected from power surge as a result for example of ac cidental connection to the power supply source for all input combinations up to 276V for 30 seconds Repairs may be realised solely by an authorised service point The device complies with the following norms EN 61010 1 and EN 61557 1 4 5 Note The manufacturer reserves the right to modify the appearance accessories and technical data of the meter Note An attempt to install drivers in 64 bit Windows 8 may result in displaying In stallation failed message Cause Windows 8 by default blocks drivers without a digital signature Solution Disable the driver signature enforcement in Windows MRU 200 OPERA
3. OPERATION MANUAL EARTH RESISTANCE METER MRU 200 uoissiusueJ ejep pue Burseje pue WIN juawainseaw AjlAnsiseJ yes d jueuieunseeui dwejo jueuno SWY I juawaisnseaw juawainseaw eouejsiseJ quee dWEJO 0M H duej jueujeunseeui gde juawainseaw eouejsisa dp 80UEJSISO de eouejsisaJ dz uonoun jueujeJnseeui BU jo uonoejes HOLIMS NOILONNA siep oy Kejdsip eui jo wojoq 2 eui suoyng AejdsiQ 33O NO 1uBipioeq GOT Jeja jo sjueujjsnfpe Jeuonippe jo NNIN uonoejes uius uonounj eu ueeJos snolAeJd 029 OSA e Jo y JO uelis 44O NO Ajddns samog 5197 205 jexoos dey e jepun pod gsn pue 1exoos 00c NYIN yeyoos SSner OPERATING MANUAL EARTH RESISTANCE METER MRU 200 SONEL S A ul Wokulskiego 11 58 100 Swidnica Version 4 6 September 23 2014 The MRU 200 meter is a modern easy and safe measu
4. clamp eee ooo wawa eene eene nnne 47 10 2 4 Influence of the auxiliary electrodes upon earth resistance measurements Jor functi n pi o EE RO NE Tes 47 10 2 5 Influence of the auxiliary electrodes upon earth resistance measurements by means of the percussive method essen 48 10 2 6 Influence of the interference current Iz upon the result of the earth resistance measurement eese eene 48 10 2 7 Influence of interference current upon the result of the earth resistance measurement using double clamps eese 48 10 2 8 Influence of the relation of the resistance measured with clamp for the multiple earthing branch to the resultant resistance 3P clamp 48 10 2 9 Additional uncertainties in accordance with IEC 61557 4 2P 49 10 2 10 Additional uncertainties in accordance with IEC 61557 5 3P 4P SP Claffip 2 o aus EA echter dete i eer 49 EMUon 49 I1 l BASIC ACCESSORIES rody pnia yw 49 11 2 ADDITIONAL ACCESSORIES eee eee een eene eene nennen een 50 12 POSITIONS OF THE METER S COVER 22 200 0200000000000000000000000000000000 51 13 MANUFACTURER eres teens tne n etna tata tassa tasse teens inen tn an 51 4 MRU 200 OPERATING MANUAL Version 4 6 1 Safety The MRU 200 meter has been designed to realise measuremen
5. certainties calculated on the basis of the measured val ues NOISE The value of the interfering signal is too high the result may be distorted by additional uncertainty 18 MRU 200 OPERATING MANUAL Version 4 6 3 4 Measurement 4p The four pole method is recommended in the case of measurements of earth resistance of very low values It permits to eliminate the influence of the test leads resistance over the result of the measurement In order to evaluate the resistance of the ground it is recommended to use the dedi cated measurement function point 3 9 Disconnect the tested earth electrode for the object installation Turn the meter on Set the rotational function selector at 4P D R E ES 5 9 Connect the current electrode driver into ground to the H socket of the meter Connect the voltage electrode driver into ground to the S socket of the meter Connect the tested earth electrode to the E socket of the meter Connect the ES socket to the earth electrode In question below the E cable The tested earth electrode as well as the current electrode and voltage electrode should be aligned MRU 200 OPERATING MANUAL Version 4 6 19 The meter is ready for measurement The auxiliary display shows the value of the interference voltage and its fre quency The setting bar shows the mains frequency set in the MENU Press F1 to order to modify t
6. MANUAL Version 4 6 43 10 Technical data e The specified accuracy applies to meter terminals e The abbreviation m v in the basic uncertainty definition means the measured value 10 1 Basic data Interference voltage measurement Un RMS Range Resolution Basic uncertainty 0 100V 1V 2 m v 3 digits e measurement for fy 15 450 Hz e frequency of measurements minimum two measurements s Interference frequency measurement fn Range Resolution Basic uncertainty 15 450Hz 1Hz 1 m v 2 digits measurement for interference voltage gt 1V for interference voltage 1V the following is displayed f Measurement of connection and equipotential bonding resistance two cable method The measurement method technical in accordance with IEC 61557 5 Range of measurement in accordance with IEC 61557 4 0 0450 19 99 Range Resolution Basic uncertainty 0 000 3 9990 0 0010 2 m v 4 digits 4 00 39 990 0 010 40 0 399 90 0 10 2 m v 2 digits 400 39990 10 4 00 19 99kO 0 01kO 5 m v 2 digits n 0 000 0 0450 range uncertainty is unspecified Measurement of earth resistance 3 4 cable method The measurement method technical in accordance with IEC 61557 5 Range of measurement in accordance with IEC 61557 5 0 1000 19 99kO Range Resolution Basic uncertainty 0 000 3 9990 0 001
7. and the frequency complies with the value set in the MENU RE Uout Uncertainty O 25V 5 10 R Lau lt 500 50V 2 5 10 Rp Lau 25V 70 10 Ry Lau gt 50Q 2 2 50V 50 10 5 RJ Lau If the interference current exceeds 3A the possibility of measurement is blocked 10 2 7 Influence of interference current upon the result of the earth re sistance measurement using double clamps The MRU 200 meter may perform a measurement if the value of the interference current does not exceed 3A rms and the frequency complies with the value set in the MENU Re Uncertainty O 0 00 4 990 within the range of the basic uncertainty 5 00 19 90 5 10 Re La 20 0 149 90 6 107 Ry aw If the interference current exceeds 3A the possibility of measurement is blocked 10 2 8 Influence of the relation of the resistance measured with clamp for the multiple earthing branch to the resultant resistance 3P clamp Rc Uncertainty O 99 90 gt R 3 107 5 gt 99 90 gt R 610 5 48 MRU 200 OPERATING MANUAL Version 4 6 Rc O is the value of the resistance measured with clamps for the branch displayed by the device and Rw O is the value of the resultant multiple earth resistance 10 2 9 Additional uncertainties in accordance with IEC 61557 4 2P Influencing factor Symbol Additional uncertainty Loca
8. displayed again ENTER is pressed 9 Repeat the measurements see points 3 7 and 8 moving gt the voltage electrode by a couple of meters approaching it to and moving it away from the tested earth electrode m If the Re test results differ more than 396 then it is necessary to increase significantly the distance between the current electrode from the earth electrode in question and repeat the measurement Note A Earth resistance measurement may be realised if the interference voltage does not exceed 24V The interference voltage is measured up to 100V but over 50V is it signalled as hazardous Do not connect the meter to a voltage exceeding 100V Pay particular attention to the quality of the connection of the tested object with the test leads the contact area must be cleaned of paint rust etc If the resistance of the measurement probes is too high then the measurement of the RE earth electrode will be distorted by additional uncertainty A particularly high measurement uncertainty is generated if we measure a low value of the earth resistance with probes of a weak contact with the ground such a situation occurs often if the earth electrode is properly made and the upper layer of the ground is dry and characterised by a low conductivity Then the relation between the probe re sistance and the resistance of the measured earthing is very high and so is the case of the meas urement uncertainty which
9. 0 2 m v 4 digits 4 00 39 990 0 010 40 0 399 90 0 10 2 m v 2 digits 400 39990 10 4 00 19 99kO 0 01kO 5 m v 2 digits For 3 cable method in 0 000 0 0450 range uncertainty is unspecified 44 MRU 200 OPERATING MANUAL Version 4 6 Measurement of the auxiliary electrode resistance Range Resolution Basic uncertainty 0 9990 10 5 Re Ru Rs 8 1 00 9 99 0 01kQ digits 10 0 19 9kO 0 1kQ Measurement of multiple earth resistance with clamp three cable with clamp The measurement method technical in accordance with IEC 61557 5 Range of measurement in accordance with IEC 61557 5 0 1200 19990 Range Resolution Basic uncertainty 0 000 3 9990 0 0010 8 m v 4 digits 4 00 39 990 0 010 40 0 399 90 0 10 8 m v 3 digits 400 19990 10 n 0 000 0 0450 range uncertainty is unspecified Measurement of multiple earth resistance with double clamp Range Resolution Basic uncertainty 0 00 19 990 0 010 10 m v 3 digits 20 0 149 90 0 10 20 m v 3 digits Ground resistivity measurements The measurement method Wenners p 21 Range Resolution Basic uncertainty 0 0 199 90m 0 10m 200 19990m 10m Depends on the basic uncertainty of the Re 2 00 19 99kOm 0 01kOm AP measurement but 20 0 99 9kO0m 0 1kOm not less than 1 digit 100 999kOm 1kOm e di
10. 1 Set the rotational function selector at MEM 2 Connect the cable to the USB port of the computer and the USB socket of the meter 3 Start the programme 5 3 Data transmission with OR 1 radio module 1 Pod czy modu OR 1 do gniazda USB komputera PC 1 Connect OR 1 module to the USB socket of the PC 2 Start data filing programme 3 Select Wireless transmission in the main MENU of the meter MENU Measurement settings Meter settings Language Manufacturer info Edit Choice Choice Memory browsing Memory erasing ENTER Accept icon ___ _________ LI Choice gt 4 If a code change is necessary select Modify PIN code MRU 200 OPERATING MANUAL Version 4 6 37 ess transmission Mireless transmission Modifu PIM code Edit Choice o Choice Accept The same code must be entered in the computer programme It is used for securing transmission 6 To start transmission select Wireless transmission in the MENU or press F1 in the MEM posi tion The following messages will be displayed Establishing RF connection and then Active wire less connection If it is impossible to establish connection the message Wireless connection lost will appear Once the connection is established follow the programme manual for data filing Note A Standard PIN code for OR 1 is 123 38 MRU 200 OPERATING MANUA
11. 3 9 Earth resistivity measurements For the purpose of earth resistivity measurements which are used as a preliminary measure for the project of earthing systems or in geology there is a separate function which is selected by means of the rotational function selector earth resistivity measurements p The function is metrolo gically identical as the four pole earth resistance measurement but it includes an additional proce dure of storing of the distance between the electrodes The result of the measurement is the re sistance value which is calculated automatically in accordance with the following formula p which is used in the Wenner s measurement method The method in question assumes equal dis tances between electrodes 9 LL 4 5 Turn the meter Set the rotational function selector at p a L L lt gt gt gt Connect the four aligned and equally spacer probes which are driven into the ground to the meter and do so In accordance with the diagram above The meter is ready for measurement The auxiliary display shows the value of the interference voltage and its fre quency The setting bar shows the measurement voltage mains frequency set in the MENU and the distance be tween the electrodes Press F1 to change the measurement voltage MRU 200 OPERATING MANUAL Version 4 6 31 32 Use buttons W
12. EQUIPOTENTIAL BONDING 2P 13 3 2 CALIBRATION OF THE TEST LEADS ccecsessscecececsesssaeceeececeessaaececccecsensaseeseecesenes 14 3 2 1 E UHSqATm an me 14 3 2 2 Auto zeroing off OO SEO pictus A BOO WEOL i 15 3 3 MEASUREMENT 3P GA ver etre tii HUE 16 3 4 MEASUREMENT AP idei dte c UU E e tebe ieee RAE 19 3 5 MEASUREMENT 22 3 6 D WO CLAMP 5 21 4 442444120 01010000000000000000000000000000 24 3 7 MEASUREMENT 4P E E E E tis 26 3 8 CURRENT MEASUREMENT 1 4 000000 000000000000000000000000 29 3 0 EARTH RESISTIVITY MEASUREMENTS cscsscsssccecsessnsscecececeesesseseceeececsesssaeceeeeeeees 31 4 MEMORY de 34 4 1 SAVING OF THE MEASUREMENT RESULTS IN THE MEMORY ssssesscceeececsessnteeeeees 34 4 25 MEMORY ERASING eco teste e eeepc ee eerte 35 4 3 MEMORY BROWSING cccsessscecececsesssaececececeessaaeceeccecsesaueceecesesesauecesececeessaaeeeeess 36 5 DATA TRANSMISSION vessssssssscntsssnssesscsesensssnnssssncssonnssonassnsnsessessvasesentesenssesntesses 37 5 1 COMPUTER CONNECTION ACCESSORIEG sssscscsccecsesssstceeececsessaeceecceceessaseeeeeeeees 37 5 2 CONNECTION OF THE METER TO A COMPUTER ccscsesessscecececeesenssaeceeeceesentsaseeeecs 37 5 3 DATA TRANSMISSION WITH OR 1 RADIO MODULE
13. L Version 4 6 6 Power supply Note Instrument MRU 200 has been designed for use only with the supplied re chargeable batteries Using disposable instead of rechargeable batteries can take place only in emergency cases e g total discharge of batteries during field measurements of electric poles However a rapid discharge of disposa ble batteries several measurements and malfunction of the instrument at high instantaneous power consumption should be expected 6 1 Monitoring of the power supply voltage The level of the charge of the batteries or accumulators is currently indicated by the symbol in the right upper corner of the display Battery charged Battery low EHT Battery fully discharged Battery empty Battery fully discharged Measuring blocked 0 Shutdown meter Note The displayed BAT symbol means insufficient power supply voltage and the need to charge the ac cumulators Measurements realised with an insufficient meter power supply voltage are distorted with additional errors which are impossible to ascertain by the user and thus they cannot constitute a basis for a conclusion of correctness of the tested earthing system 6 2 Heplacement of accumulators The MRU 200 meter is equipped with a package of accumulators and charger The package of accumulators is placed in a compartment The charger is installed inside the meter casing and it may be used solely
14. OPERATING MANUAL Version 4 6 27 placed in such a manner than the angle between the gauging aligned amount to 60 The meter is ready for measurement The auxiliary display shows the value of the interference voltage and its frequen cy The setting bar shows the pulse build up time Press F1 in order to modify the pulse shape Impulse rising time M 4uns 18us O 8us 26us O 18us 358us Use buttons and W to set the pulse shape and press ENTER Press START In order for the test to commence measurement Read out the result ac Current electrode resistance a Voltage electrode resistance 4 Additional uncertainty caused by the resistance of the electrodes MRU 200 OPERATING MANUAL Version 4 6 The result is displayer for 20s It may be displayed again when ENTER is pressed Notes A Earth impedance measurement may be realised if the interference voltage does not exceed 24V The interference voltage is measured up to 100V but over 50V is it signalled as hazardous Do not connect the meter to a voltage exceeding 100V Impulse 8 20us is available from firmware version 2 04 Ru i Rs are measured by means of the low frequency method Pay particular attention to the quality of the connection of the tested object with the test leads the contact area must be cleaned of paint rust etc If the resistance of the measurement probes is too high then the measurement of the Ze ear
15. TING MANUAL Version 4 6 5 2 Menu The menu is available at any position of the knob MENU Press MENU MENU Measurement settings Meter settings x Lanauase choice Manufacturer info Edit Using buttons and W highlight a the required position Press ENTER to select the option 2 1 Wireless transmission ram Choice See chapter 5 3 2 2 Measurement settings 9 Measurement settinas Clamp calibration Earth resistivity settings Press ENTER to select the option 2 Using buttons and W highlight the required position 6 MRU 200 OPERATING MANUAL Version 4 6 2 2 1 Mains frequency It is necessary to determine the frequency of the mains which is the source of potential interfer ence in order to select the appropriate frequency of the measurement signal Solely measurements based upon the correct frequency of the measurement signal will guarantee the optimum interference filtering The meter is adapted for filtering of interference from 16 2 3Hz 50Hz 60Hz and 400Hz net works It also has the function of automatic specification of the parameter in question selection of the mains frequency AUTO which is based upon the result of measurements of the interference volt age realised before the earth resistance measurement The function is active if the interference volt age Uu 2 1V Otherwise the meter adopts the last frequency value selected from the MENU 5 Frequ
16. anguage choice e Use buttons Ak and W to select Language choice in the main MENU and press ENTER e Use buttons and W to select the language and press ENTER 2 5 Information on the manufacturer Use buttons and in order to select Product info and press ENTER 12 MRU 200 OPERATING MANUAL Version 4 6 3 Measurements Note During measurements the status bar is displayed 3 1 Measurement of earth connection and equipotential bonding 2P Note The measurement complies with the requirements specified in the norm EN 61557 4 U lt 24V I gt 200mA for R lt 10Q p M t Turn the meter on Set the rotational function selector at 2P 2 Connect the object being measured to the terminals S and E of the meter The meter is ready for measurement The auxiliary display shows the value of the interference voltage and its fre quency The setting bat shows the mains frequency set in the MENU MRU 200 OPERATING MANUAL Version 4 6 13 Press START In order for the test to commence R 3 8889 Read out the result fn 5SBHz Measurement Write pneum The result is displayer for 20s It may be displayed again ENTER is pressed Additional information displayed by the meter R gt 19 99kO Measurement range exceeded Un gt 40V and a con tinuous sonic signal The voltage on the measurement points exceeds 40V the measurement is blocked v Un g
17. arness to carry the device two pieces short and long WAPOZSZEKPL USB cable WAPRZUSB Cable to charge the accumulators from the car lighter socket WAPRZLAD12SAM Accumulator charger to be used in different countries WAZASZT Operating manual MRU 200 OPERATING MANUAL Version 4 6 49 11 2 Additional accessories Furthermore the manufacturer and authorised distributors offer the following elements which are not included in the basic accessories package WASONG80 WACEGN1BB e 80cm measurement probe to be driven into the ground Transmission clamp N 1 WACEGCSOKR WACEGF10KR Reception clamp C 3 e Flexible clamp F 1 WAFUTL3 WAPOJ1 e 80cm probe protective cover e Batteries compartment LSWGBMRU200 e Certificate of calibration 50 MRU 200 OPERATING MANUAL Version 4 6 12 Positions of the meter s cover The movable cover enables using the meter in various positions 224 1 Cover as the bottom of the meter 2 Cover used as a support 3 Cover in the position that enables convenient use of the meter suspended on the neck by means of hanging straps 13 Manufacturer The manufacturer of the device which also provides guarantee and post guarantee service is the following company SONEL S A ul Wokulskiego 11 58 100 Swidnica Poland tel 48 74 858 38 60 fax 48 74 858 38 09 E mail export sonel pl Web page www sonel pl Attention Service repairs must be realized solely
18. arth resistance by means of the clamp method is performed necis te tene TEA EE Ws 3 Arms Frequency of the measurement p 125Hz for the 16 2 3Hz 50Hz 400Hz and 150Hz for the 60Hz mains Measurement voltage and current for 2P U lt 24 Vrms 12200 mA for R lt 60 Measurement voltage for ve 3 Measurement current short circuit current for 3P 4P s s gt 200 mA Maximum resistance of measurement electrodes m 20 Signalling of insufficient clamp current lt 0 5 mA Power supply of the meter accumulator package type SONEL NiMH 4 8V 4 2 Ah parameters of AC adapter for the battery charge 100 V 240 V 50 Hz 60 Hz Number of measurements for R 2P 21500 10 2 measurement minute Number of measurements for Re gt 1200 100 Ru Rs21000 2 measurement minute Duration of a resistance measurement by means of the two pole method 6s Duration of a resistance and resistivity measurement by means of other methods 8s eo EYED a ner de e NE 288 x 223 x 75 mm Mass of the meter with accumulators we Working temperature icc EA act eotteadbtensoreh eo pee ee cp y sva auia Temp
19. at them it is recommended to charge the accumulators from time to time even if not in use 42 MRU 200 OPERATING MANUAL Version 4 6 Modern fast chargers detect both too low and too high a temperature of accumulators and react to the situation adequately Too low a temperature should prevent the start of the process of charging which might damage the accumulator irreparably An increase of the temperature of the accumulator is a signal to stop charging and is a typical phenomenon However charging at a high temperature of the environment apart from reducing the lifetime causes an accelerated increase of the temperature of the accumulator which will be not charged to its full capacity Remember that in the case of quick charging accumulators are charged to approximately 8096 of their capacity better results may be obtained if the process of charging is continued the charger goes then to the phase of charging with a low current and after next couple of hours the accumulators are charged to their full capacity Do not charge or use accumulators in extreme temperatures Extreme temperatures reduce the life time of batteries and accumulators Avoid placing devices powered from accumulators in very hot en vironments The nominal working temperature must be absolutely observed 7 Cleaning and maintenance NOTE Apply solely the maintenance methods specified by the manufacturer within the present manual The casing of the meter
20. by the manufacturer MRU 200 OPERATING MANUAL Version 4 6 51 52 Multifunction Electrical ALLONS Viele MRU 200 Earth Resistance and Resistivity Meti MIC 2 Insulation Resistance Meter Power quality analyzer CMM 40 Industrial multimeter MRU 20 Earth Resistance and Resistivity Meter Dalaloggi atalogging Light Meter DIT 500 IR thermometer MPI 505 Multifunction Electrical Installations Meter CMP 1006 Digital Clamp on multimeter MPI 502 Multifunction Electrical Installations MIC 2510 Insulation Resistance Meter MIC 30 Insulation Resistance Meter PAT 805 Portable appliance MMR 630 Microohmeters LKZ 700 Wire tracer MRU 200 OPERATING MANUAL Version 4 6 SONEL S A Wokulskiego 11 St 58 100 Swidnica Poland a 48 74 85 83 860 48 74 85 83 800 fax 48 74 85 83 808 http www sonel pl e mail export sonel pl
21. charge of the package is signalled with the following message Discharging of accumulators in progress 6 6 General principles regarding using Ni MH accumulators If you do not use the device for a prolonged period of time then it is recommended to remove the accumulators and store them separately Store the accumulators in a dry cool and well ventilated place and protect them from direct sunlight The temperature of the environment in the case of prolonged storage should not exceed 30 C If the accumulators are stored for a long time in a high temperature then the occurring chemical processes may reduce their lifetime Accumulators Ni MH resist normally 500 1000 charging cycles The accumulators reach their maxi mum capacity after being formatted 2 3 charge and discharge cycles The most important factor which influences the lifetime of an accumulator is the depth of discharge The deeper the discharge of the accumulator the shorter its lifetime The memory effect is limited in the case of Ni MH accumulator These accumulators may be charged at any point with no serious consequences However it is recommended to discharge them completely every few cycles During storage of Ni MH accumulators they are discharged at the rate of approximately 30 per month Keeping accumulators at high temperatures may accelerate this process even 100 In order to prevent excessive discharge of accumulators after which it would be necessary to form
22. depends on it What may be done then is to perform in accordance with the formulae specified in point 10 2 calculations which will permit to evaluate the influence of the measurement conditions It is also possible to improve the contact of the probe with the ground for example by means of moistening of the place when the probe is driven its driving into the ground in another place or using a 80 centimetre probe Check also the test leads and make sure the insulation is not damaged and the contacts test lead banana plug probe are not corroded or loosened In most cases the achieved resolution of the measurement is sufficient but it is necessary to be con scious of the uncertainty the measurement is burdened with If the resistance of H and S probes or one of them exceeds 19 9kO an appropriate message is dis played R H and R S electrodes resistance are higher than 19 9 kO Measurement impossi ble Manufacturers calibration doesn t include the resistance of test leads Displayed result is sum of measured object and test leads resistance Additional information displayed by the meter Re gt 19 99kO Measurement range exceeded ie and The voltage on the measurement points exceeds 40V meus Fu signa the measurement is blocked Un gt 24V The voltage on the measurement points exceeds 24V but lower than 40V the measurement is blocked The uncertainty of the electrode resistance 3096 Un LIMIT
23. encu choice Using buttons and W select the frequency and press ENTER to select the option 2 2 2 Calibration of the measurement clamp C 3 The clamp bought apart for a meter that was purchased before must be calibrated before it is used for the first time It may be periodically calibrated in order to avoid the influence of the ageing elements upon the resolution of measurements The procedure of calibration must be realized also after clamp has been replaced pes Having read the preliminary infor mation ENTER 2 Follow the displayed instructions MRU 200 OPERATING MANUAL Version 4 6 7 calibration Clamp Connect socket H with E Put clamps on wire Press TART 3 Once the calibration has been successfully concluded The following will be displayed Clamp calibration 28 44 000 CRLIBRRTION SUCCESS Press The meter has determined the correction factor for connected clamp The factor is saved in the memory also when the power supply of the meter is off until the following successful calibration of the clamp has been performed Note Make sure the test lead passes centrally through the clamp Additional information displayed by the meter Message Cause Procedure The clamp is not Check whether the connected clamp is connected to the device or ERROR CLAMP NOT CONNECTED whether iis placed CONNECTED TO H AND E SOCKET upon the test lad used by the meter to fo
24. ensation once for the given test leads It is also remembered once the meter has been turned off 3 3 Measurement 3P The basic kind of the earth resistance measurement is three pole measurement Disconnect the tested earth electrode for the object installation JM O J a spi 4 Turn the meter Set the rotational function selector at 3P Connect the current electrode driver into ground to the H socket of the meter Connect the voltage electrode driver into ground to the S socket of the meter Connect the tested earth electrode to the E socket of the meter The tested earth electrode as well as the current electrode and voltage electrode should be aligned 16 MRU 200 OPERATING MANUAL Version 4 6 The meter is ready for measurement The auxiliary display shows the value of the interference voltage and its fre quency The setting bar shows the mains frequency set in the MENU Press F1 to order to modify the measuring voltage e Choice Accept Use buttons W to set the measuring voltage and press ENTER Press START In order for the test to commence measurement Read out the result Current electrode resistance Voltage electrode resistance Additional uncertainty caused by the resistance of the electrodes Displayed when 5 gt 30 MRU 200 OPERATING MANUAL Version 4 6 17 The result is displayer for 20s It may be
25. er value of the dynamic resistance The impulse impedance is calculated on the basis of the following formula Where Us ls peak value of the current and voltage The impulse method is used to determine the resultant earth resistance Therefore the control measurement points must not be undone 26 MRU 200 OPERATING MANUAL Version 4 6 It is recommended to place the test leads in such a manner that the angle between them is at least 60 Note Measuring leads must be completely unrolled Otherwise the result of the measure may be wrong The following illustration explains the numbers which determine the shape of the pulse in ac cordance with EN 62305 1 Lightning protection Section 1 General Requirements T T gt t current amplitude pulse leading edge duration Ta time to semi spike The pulse shape is determined by the relation T T2 eg 4 10 Turn the meter on Set the rotational function selector at Connect the current electrode driver into ground to the H socket of the meter Connect the voltage electrode driver into ground to the S socket of the meter Connect the tested earth electrode to the E socket and the shield of the H ca ble Connect the ES socket to the earth electrode in question below the E cable The tested earth electrode and the current electrode and voltage electrode should be MRU 200
26. erature range suitable for initiating battery charging Temperatures at which loading is interrupted below 5 C and above or equal to 50 C MRU 200 OPERATING MANUAL Version 4 6 Reference temperature eee aaa aaa y 2Storage temperature na A nan UHR ES WOT WA ais O Aia Relative humidity a Relative humidity nominal b Quality standard cc The product meets EMC requirements according to the following standards DM ERE EN 61326 1 2006 and EN 61326 2 2 2006 10 2 Additional data Data regarding additional uncertainties are useful mainly in the case the meter is used under non standard conditions as well as for measurement laboratories for the purpose of calibration y z a b 10 2 1 Influence of the serial interference voltage Uz upon earth resistance measurements for functions 3P 4P 3P clamp R Additional uncertainty Q 25 107 8 42 10 SU E z 23 9990 5 107 R 2 107 U 10 2 2 Influence of the serial interference voltage Uz upon earth resistance measurements for function p 0 2 5 10 R 10 Ry U Uz W R 2 z L 10 2 3 Influence of the auxiliary electrodes upon earth resistance meas urements for function 3P 4P 3P clamp where Ru Rs Additional uncertainty 96 br
27. es within the range of the basic uncertainty 0 000 RH gt 5000Q R R 1 1 9 9990 Rs gt 5000 or 5 _ 200 H 5 107 12 9 4 107 Ru and Rs gt 500Q R 4 106 Ry 200 Rg gt RH lt 1kQ and Rss1kO within the range of the basic uncertainty gt 1 or R R 23 9990 Re gt 1kQ or 5 2004 H__ 5 107 R 4 107 Ru and Rs gt 1kQ R 10 Rg R 200 Rg O Rs Q and Ru O are values which are displayed by the device 10 2 4 Influence of the auxiliary electrodes upon earth resistance meas urements for function p Ru Rs Uncertainty 96 Rs within the range of the basic uncertainty MRU 200 OPERATING MANUAL Version 4 6 47 Rue 1kQ or Ry 300000 Re gt 1kQ or EC 3 32407 410 JR RZ RH and Rs gt 1kQ R Rg O Rs Q and Ru O are values which are displayed by the device 10 2 5 Influence of the auxiliary electrodes upon earth resistance meas urements by means of the percussive method RH Uncertainty lt 1500 0 0 1990 within the range of the basic uncertainty 0 0 4 90 Ru gt 1500 m 100 19 E 5 0 1990 R 100 7 10 Zg O and RH Q are values which are displayed by the device 10 2 6 Influence of the interference current lz upon the result of the earth resistance measurement 3P clamp The MRU 200 meter may perform a measurement if the value of the interference current does not exceed 3A rms
28. he measuring voltage Choice ENTER Accept Use buttons W to set the measuring voltage and press ENTER Press START In order for the test to commence measurement Read out the result Current electrode resistance Voltage electrode resistance Additional uncertainty caused by the resistance of the electrodes Rs 2 34kf Un 25U 50 Write MRU 200 OPERATING MANUAL Version 4 6 The result is displayer for 20s It may be displayed again ENTER is pressed 9 Repeat the measurements see points 3 7 and 8 moving 4 gt the voltage electrode by a couple of meters approaching it to and moving it away from the tested earth electrode f If the Re test results differ more than 3 then it is neces i sary to increase significantly the distance between the cur rent electrode from the earth electrode in question and re peat the measurement Note A Earth resistance measurement may be realised if the interference voltage does not exceed 24V The interference voltage is measured up to 100V but over 50V is it signalled as hazardous Do not connect the meter to a voltage exceeding 100V Pay particular attention to the quality of the connection of the tested object with the test leads the contact area must be cleaned of paint rust etc If the resistance of the measurement probes is too high then the measurement of the RE earth electrode will be distorted by additi
29. he ageing elements upon the resolution of measurements The clamp calibration option is in the MENU If the clamp current is insufficient an appropriate message is displayed Measured current is too low Measurement impossible Additional information displayed by the meter Re gt 149 90 Measurement range exceeded Un gt 40V and a con tinuous sonic signal The voltage on the measurement points exceeds 40V the measurement is blocked Un gt 24V The voltage on the measurement points exceeds 24V but lower than 40V the measurement is blocked NOISE The value of the interfering signal is too high the result may be distorted by additional uncertainty 3 7 Measurement The impulse method is applied in the case of measurement of the dynamic impedance of light ning arrester earthing systems It must not be used for the purpose of measurements of protective and working earthing systems Due to the high steepness of the test pulse leading edge the inductivity of the earth electrode highly influences its impedance Therefore the impedance of the earth electrode measured by means of the impulse method depends upon its length and the steepness of the test pulse leading edge The inductivity of the earth electrode causes a shift between the current spikes and the resultant voltage drop Hence extensive earth electrodes of a low resistance measured by means of the low frequency method may have a much high
30. igh measurement uncertainty is generated if we measure a low value of the earth resistance with probes of a weak contact with the ground such a situation occurs often if the earth electrode is properly made and the upper layer of the ground is dry and characterised by a low conductivity Then the relation between the probe re sistance and the resistance of the measured earthing is very high and so is the case of the meas urement uncertainty which depends on it What may be done then is to perform in accordance with the formulae specified in point 10 2 calculations which will permit to evaluate the influence of the measurement conditions It is also possible to improve the contact of the probe with the ground for example by means of moistening of the place when the probe is driven its driving into the ground in another place or using a 80 centimetre probe Check also the test leads and make sure the insulation is not damaged and the contacts test lead banana plug probe are not corroded or loosened In most cases the achieved resolution of the measurement is sufficient but it is necessary to be con scious of the uncertainty the measurement is burdened with If the resistance of H and S probes or one of them exceeds 19 9kO an appropriate message is dis played R H and R S electrodes resistance are higher than 19 9 kO Measurement impossi ble Additional information displayed by the meter p gt 999kOm Measuremen
31. ions G Use the buttons and to select 43 Memory browsing W Use the buttons and W to highlight Memory browsing 2 ENTER Press ENTER Memoru browsina Meas 5 7 Bank 2 2 Earth resistance 4p REu 5 88kf Rs 2 94k2 R 2 9 742 3 Use the buttons 4 and to select bank and the buttons and W to select a cell Note During a memory search empty cells and banks are unavailable Meas 1 20 means the first measurement in a group of 20 cells 21 99 are empty and unavailable The same principle refers to banks If the memory is not filled in a continuous manner then empty measurements and banks are skipped during browsing 36 MRU 200 OPERATING MANUAL Version 4 6 Remarks 5 Data transmission Data transmission is not possible during the charging of accumulators 5 1 Computer connection accessories What is necessary in order to operate the meter with a computer is additional accessories name ly a USB cable and appropriate software If the required accessories such have not been purchased along with the meter then they are available from the manufacturer or an authorised distributor The accessories may be used in case of many devices manufactured by SONEL S A which are equipped with the USB interface Detailed information regarding software is available from the manufacturer or an authorised dis tributor 5 2 Connection of the meter to a computer
32. may be cleaned with a soft damp cloth using all purpose detergents Do not use any solvents or cleaning agents which might scratch the casing powders pastes etc Clean the probe with water and dry it Before the probe is stored for a prolonged period of time it is recommended to grease it with any machine lubricant The reels and test leads should be cleaned with water and detergents and then dried The electronic system of the meter does not require maintenance 8 Storage In the case of storage of the device the following recommendations must be observed Disconnect all the test leads from the meter Clean the meter and all its accessories thoroughly Wind the long test leads onto the reels In the case the meter is to be stored for a prolonged period of time the batteries must be re moved from the device e In order to prevent a total discharge of the accumulators in the case of a prolonged storage charge them from time to time 9 Dismantling and disposal Worn out electric and electronic equipment should be gathered selectively i e it must not be placed with waste of another kind Worn out electronic equipment should be sent to a collection point in accordance with the law of worn out electric and electronic equipment Before the equipment is sent to a collection point do not dismantle any elements Observe the local regulations concerning disposal of packages worn out batteries and accumula tors MRU 200 OPERATING
33. nce of test leads Displayed result is sum of measured object and test leads resistance Additional information displayed by the meter Re gt 19 99kO Measurement range exceeded 1 aa The voltage on the measurement points exceeds 40V ie signa the measurement is blocked Un gt 24V The voltage on the measurement points exceeds 24V but lower than 40V the measurement is blocked The uncertainty of the electrode resistance 3096 Un LIMIT certainties calculated on the basis of the measured val ues NOISE The value of the interfering signal is too high the result may be distorted by additional uncertainty MRU 200 OPERATING MANUAL Version 4 6 21 3 5 Measurement 3p clamp gt X 2 gt Turn the meter on Set the rotational function selector at 3P R 40 HO gt UM Connect the current electrode driver into ground to the H socket of the meter Connect the voltage electrode driver into ground to the S socket of the meter Connect the tested earth electrode to the E socket of the meter The tested earth electrode as well as the current electrode and voltage electrode should be aligned Snap the clamp on the tested earth electrode below the E cable connection Earth resistance 5 Choice ENTER Accept The meter is ready for measurement The auxiliary display shows
34. off the setting bar display Use buttons and to set the dis play of the setting bar measurement parameters press ENTER UH GU fuz 11 8 Ru 4 87kf R 2 9789 2 54 ENTER Write START Measurement Visible bar Hidden bar 10 MRU 200 OPERATING MANUAL Version 4 6 2 3 5 Date and time Date time a 83 09 2009 88 44 v ec hoice 2 1 Use buttons 4 and p to select the value to be modified Day month hour minute 3 ENTER Use buttons and to set G the value Once the date and time have been set press 2 3 6 Battery discharging The procedure is fully described in chapter 6 4 2 3 7 Programme update NOTE The function is designed to be used solely by those users who are familiar with computer equipment The guarantee does not cover faults caused by incorrect application of this function NOTE Before you proceed to programming charge the accumulators During programming do not turn the meter off or disconnect the transmission ca ble Before you proceed to updating the programme download from the manufacturers web page www sonel pl the meter programming software install it in the computer and connect the meter to the computer Having chosen the Program update in the MENU proceed in accordance with the instructions displayed by the programme MRU 200 OPERATING MANUAL Version 4 6 11 2 4 L
35. on displayed by the meter 2 gt 1990 Measurement range exceeded Mad and KR The voltage on the measurement points exceeds 40V INUOUS p signa the measurement is blocked Un gt 24V The voltage on the measurement points exceeds 24V but lower than 40V the measurement is blocked The uncertainty of the electrode resistance 3096 Un LIMIT certainties calculated on the basis of the measured val ues NOISE The value of the interfering signal is too high the result may be distorted by additional uncertainty 3 8 Current measurement The present function facilitates measurements of the current effective value using measurement clamp It may be used for example for the purpose of measurements of the leakage current in the in stallation in question It is possible to choose between two types of clamps C 3 or F 1 which differ in regard to diameter and measured current range see Technical Data MRU 200 OPERATING MANUAL Version 4 6 29 Turn the meter on Set the rotational function selector at I Current me Press F1 to select type of clamp Choice Accept 4 TR Use buttons to select the type of clamp and press Measurements are continuous and there is no possibility of their being saved Flexible clamp F 1 may be used solely for the purpose of measurements of currents 1A Notes 30 MRU 200 OPERATING MANUAL Version 4 6
36. onal uncertainty A particularly high measurement uncertainty is generated if we measure a low value of the earth resistance with probes of a weak contact with the ground such a situation occurs often if the earth electrode is properly made and the upper layer of the ground is dry and characterised by a low conductivity Then the relation between the probe re sistance and the resistance of the measured earthing is very high and so is the case of the meas urement uncertainty which depends on it What may be done then is to perform in accordance with the formulae specified in point 10 2 calculations which will permit to evaluate the influence of the measurement conditions It is also possible to improve the contact of the probe with the ground for example by means of moistening of the place when the probe is driven its driving into the ground in another place or using a 80 centimetre probe Check also the test leads and make sure the insulation is not damaged and the contacts test lead banana plug probe are not corroded or loosened In most cases the achieved resolution of the measurement is sufficient but it is necessary to be con scious of the uncertainty the measurement is burdened with f the resistance of H and S probes or one of them exceeds 19 9 an appropriate message is dis played R H and R S electrodes resistance are higher than 19 9 kO Measurement impossi ble Manufacturers calibration doesn t include the resista
37. r place or using a 80 centimetre probe Check also the test leads and make sure the insulation is not damaged and the contacts test lead banana plug probe are not corroded or loosened In most cases the achieved resolution of the measurement is sufficient but it is necessary to be con scious of the uncertainty the measurement is burdened with If the resistance of H and S probes or one of them exceeds 19 9kQ an appropriate message is dis played R H and R S electrodes resistance are higher than 19 9 kO Measurement impossi ble Manufacturer s calibration doesn t include the resistance of test leads Displayed result is sum of measured object and test leads resistance Additional information displayed by the meter gt 19990 Measurement range exceeded Un gt 40V and a con tinuous sonic signal M Un gt 24V The voltage on the measurement points exceeds 24V but lower than 40V the measurement is blocked NOISE The value of the interfering signal is too high the result may be distorted by additional uncertainty The uncertainty of the electrode resistance 3096 Un LIMIT certainties calculated on the basis of the measured val ues Excessive interfering current the measurement error may exceed the basic error The voltage on the measurement points exceeds 40V the measurement is blocked gt 3 6 Two clamp measurement Two clamp measurements are applied where the
38. rce the pas sage of current ERROR WIRE NOT CONNECTED No wire Revise the connec TO H AND E TERMINAL tions CALIBRATION ABORTED PRESS ENTER 8 MRU 200 OPERATING MANUAL Version 4 6 Message Cause Procedure ERROR CALIBRATION Incorrect calibra Check the quality of COEFFICIENT OUT OF RANGE tion factor the connections CALIBRATION ABORTED PRESS ENTER and or replace the clamp 2 2 3 Earth resistivity settings 9 2 Earth resistivity settings Result Distance unit unit fm m D aft Ll tft m 4 Choice Accept 2 3 Meter settings LCD Backlight Ruto off settings Display settings Date time Software uparade Edit Choice 2 3 1 LCD contrast Using the buttons and W set the contrast value and press ENTER LCD contrast Battery discharging Using buttons V 4 and P select the result and the distance unit and press ENTER to confirm MRU 200 OPERATING MANUAL Version 4 6 2 3 2 LCD Backlight LCD Backlight Accept pm Choice gt to confirm ENTER Use W to set the time for LCD Q backlight shut off and press ENTER 2 3 3 AUTO OFF settings The setting determines the time before the automatic turning off of the device when it is not in use Use buttons and to set the time or AUTO OFF disable press ENTER 2 3 4 Display settings The setting permits to turn on
39. re is no possibility of using ground driven elec trodes NOTE The two clamp method may be used solely in the case of multiple earthing measurements 24 MRU 200 OPERATING MANUAL Version 4 6 Turn the meter on Set the rotational function selector at R R Connect the transmission clam to sockets H and E while the measurements clamp should be connected to the clamp socket Snap the transmission clamp and measurement clamp on the tested earth elec trode AT east 30cm from each other l1 1 4mA fuz The meter is ready for measurement The auxiliary display shows the value of the leakage current passing through the clamp and its frequency Measurement eee Press START In order for the test to com mence measurement R 8 849 Read out the result fn 58Hz Write The result is displayer for 20s It may be displayed again ENTER is pressed MRU 200 OPERATING MANUAL Version 4 6 25 Notes A Measurements may be performed in the presence of interference current not exceeding 3A rms and whose frequency complies with the value set in the MENU A Flexible clamp must not be used for this measurement The clamps are not the part of meter basic accessories you have to purchase them apart The clamp must be calibrated before it is used for the first time It may be periodically calibrated in order to avoid the influence of t
40. ring device Please acquaint yourself with the present manual in order to avoid measuring errors and prevent possible problems related to opera tion of the meter 2 MRU 200 OPERATING MANUAL Version 4 6 TABLE OF CONTENTS 1 SAFETY e 5 2 MENU e 3 6 221 WIRELESS TRANSMISSION itt eee coo S epe ie cie ea eaa xb ee cates o 6 2 2 MEASUREMENT SETTINGS ccessessscecccecsessuececececsessnaececececceseaeaecececeesenseaeeeeeceenes 6 2 2 1 Mains frequency te ee A ERE R AL ER SS 7 22 2 Calibration of the measurement clamp 3 7 2 2 3 Earth resistivity settings etc 9 2 3 METER SETTINGS onere rH RETE EE PRESS OW A A 9 2 3 1 TEC D E LOWE 9 2 3 2 LCD s t edle ERR ERE e ae E 10 2 3 3 AUTO OFF settings ida de Ge dede ee i eds e 10 2 3 4 Display Settings ai eee t b ree eee t ge eed 10 2 3 5 Date and time 11 2 3 6 Battery discharging 4 O O OO te eee 11 2 27 Programme update ic Ro 11 2 4 LANGUAGE CHOICE w eei eee peer eX ERR E 12 2 5 INFORMATION ON THE MANUFACTURER sssessssesececeesensececececeesenssaeceeececsesnsaeeeeecs 12 3 MEASUREMENTS ssssscccssssscscesscssvsacesocssnssosencsdbsctedntcssenceesssovecsesseesnstsesedesiecevessseas 13 3 1 MEASUREMENT OF EARTH CONNECTION AND
41. rtment instead of batter jes The ambient tem It is not possible to charge the perature is lower accumulators correctly in such a than 10 C temperature Place the meter in a warm place and commence the Battery temperature too charging mode anew low The present message may be displayed also in the case of deep discharging of the accumu lators It is then recommended to try to turn the charger repeatedly A damaged or The message is displayd for a deeply discharged while and then the precharge accumulator pack process begins again If after Precharge error age Several attempts the message Battery temperature too high is displayed replace the pack age MRU 200 OPERATING MANUAL Version 4 6 41 6 5 Discharging of accumulators In order to guarantee proper functioning of the accumulators charge indications and prolong their durability it is recommended to charge them from zero from time to time Proceed as follows in order to discharge the accumulators Press MENU and highlight Meter settings Press ENTER settings 13 33 Meter LCD contrast LCD Backlight Ruto off settings Display settings Date time Battery discharging Software uparade Edit A ETE Choice 2 1 Use buttons to select Battery discharging and press ENTER ENTER Read the displayed text and accept Discharging which may last up to 10 hours depending on the level of the
42. s the previous ones 4 1 Saving of the measurement results in the memory ENTER Once the measurement has finished press ENTER Memory write Memory write 5 98 Bank 2 18 UN BU i Earth resistance 4p 6 8 Rs 2 34kf Meas 7 99 Bank 2 18 Meas R 2 9748 4 gt Bank Empty cell Occupied cell Selection of the measure cell is realised by means of the buttons and W Bank May be selected with the buttons 4 and gt To save press ENTER O Should you intend to save data In an occupied cell the following message will be dis played Memory write Cell occupied Overwrite ENTER Accept Choice 4 Once the option has been selected with the buttons 4 and gt press ENTER 34 MRU 200 OPERATING MANUAL Version 4 6 42 Memory erasing Note During the process of memory erasing the progress bar is being displayed Memory browsing Memory erasing ENTER Accept Choice ENTER Memory erasing Memory erase Bank erase Measurement erase Accept Choice Turn the meter on Set the rotational function selector at MEM Using the buttons and W highlight Memory erasing Press ENTER MRU 200 OPERATING MANUAL Version 4 6 35 complete Memory erase Bank erase 7 or Measurement erase Follow the displayed instruct
43. stance between measurement probes L 1 50m MRU 200 OPERATING MANUAL Version 4 6 Measurement of leakage damage current rms Range Resolution Basic uncertainty 0 1 99 9mA 0 1mA 8 m v 5 digits 100 999mA 1mA 8 m v 3 digits 5 m v 5 digits 1 00 4 99A 2 0 01A PD unspecified 5 00 9 99A12 0 01A 10 0 99 9 12 0 1A 5 m v 5 digits 100 300A 1A clamp diameter 52mm C 3 flexible clamp F 1 frequency range 45 400Hz Earth resistance measurement by means of the impulse method Range Resolution Basic uncertainty 0 0 99 90 0 10 100 1990 10 impulse shape 4 10us or 10 350us impulse measurement current approximately 1A spike voltage approximately 1500V 2 5 m v 3 cyfry Other technical data Kind of insulation 2 22 002 7 double in accordance with EN 61010 1 and IEC 61557 Measurement Category Em IV 300V lt 2000m above sea level IV 255V lt 3000m above sea level EN 61010 1 compliant Protection grade of the casing in accordance with EN 60529 IP54 Maximum interference voltage AC DC at which a measurement may be performed 24 V Maximum measured interference 100 V Maximum interference current at which a measurement of the e
44. t 24V The voltage on the measurement points exceeds 24V vi but lower than 40V the measurement is blocked NOISE The value of the interfering signal is too high the result may be distorted by additional uncertainty 3 2 Calibration of the test leads In order to eliminate the influence of the resistance of the test leads over the result of the meas urement it is possible to realise its compensation auto zeroing In order to do so the measurement function 2P includes the AUTOZERO subfunction 3 2 1 Auto zeroing on 9 BR T Turn the meter on Set the rotational function selector at 2P 2 Q Press F1 3 Follow the displayed instructions 14 MRU 200 OPERATING MANUAL Version 4 6 Compensation To eliminate wire resistance short circuit its endings and press START To disable compensation disconnect measurement endings and press START sd Exit Compensation 21 3500 Compensation succeeded Press Auto zeroing is signalled by the legend AUTOZERO on the right hand side of the display 3 2 2 Auto zeroing off Turn the meter on o Set the rotational function selector at 2P 2 Press F1 6 3 Separate the test leads Press START START MRU 200 OPERATING MANUAL Version 4 6 15 Once the auto zeroing function has been turned off the legend AUTOZERO will be no long er displayed Note It is sufficient to realize comp
45. t range exceeded Muni and a The voltage on the measurement points exceeds 40V eos a signa the measurement is blocked Un gt 24V The voltage on the measurement points exceeds 24V but lower than 40V the measurement is blocked The uncertainty of the electrode resistance 3096 Un LIMIT certainties calculated on the basis of the measured val ues NOISE The value of the interfering signal is too high the result may be distorted by additional uncertainty MRU 200 OPERATING MANUAL Version 4 6 33 4 Memory The MRU 200 meters are equipped with a memory whose capacity is 990 results of resistance measurements Individual measurements are saved in memory cells The whole memory is divided into 10 banks with 99 cells each Each result may be saved in a cell of a defined number and in the selected bank so the user of the meter may at their own discretion assign numbers of the cells to individual measurement points and the numbers of the banks to individual objects realise measure ments in any order and repeat them without loosing other data The memory of the results of the measurements is not deleted when the meter is turned on so they may be read further on or transmitted to the computer The number of the current cell and the bank is not modified either It is recommended to delete the memory once the data have been read or before a new series of measurements is realised New measurements may be saved in the same cells a
46. th elec trode will be distorted by additional uncertainty A particularly high measurement uncertainty is gen erated if we measure a low value of the earth resistance with probes of a weak contact with the ground such a situation occurs often if the earth electrode is properly made and the upper layer of the ground is dry and characterised by a low conductivity Then the relation between the probe re sistance and the resistance of the measured earthing is very high and so is the case of the meas urement uncertainty which depends on it What may be done then is to perform in accordance with the formulae specified in point 10 2 calculations which will permit to evaluate the influence of the measurement conditions It is also possible to improve the contact of the probe with the ground for example by means of moistening of the place when the probe is driven its driving into the ground in another place or using a 80 centimetre probe Check also the test leads and make sure the insulation is not damaged and the contacts test lead banana plug probe are not corroded or loosened In most cases the achieved resolution of the measurement is sufficient but it is necessary to be con scious of the uncertainty the measurement is burdened with If the resistance of H and S probes or one of them exceeds 1kQ an appropriate message is dis played R H and R S electrodes resistance are higher than 1 kO Measurement impossible Additional informati
47. the value of the interference voltage and its frequen cy The setting bar shows the mains fre quency set in the MENU Press F1 to ordered to modify the meas uring voltage 22 MRU 200 OPERATING MANUAL Version 4 6 Use buttons W to set the meas uring voltage and press ENTER Press START in order for the test to commence measurement Earth resistance 5 28 Read out the result a Current electrode resistance a Voltage electrode resistance Ri 3 5 212 4 Additional uncertainty caused by the resistance of the electrodes fn 58Hz Measurement Write to memory The result is displayer for 20s It may be displayed again ENTER is pressed 7 Repeat the measurements see points 2 and 5 moving the gt voltage electrode by a couple of meters approaching it to and moving it away from the tested earth electrode If the Re test results differ more than 3 then it is necessary to increase significantly the distance between the current elec trode from the earth electrode in question and repeat the gaug ing Notes Flexible clamp must not be used for this measurement A Earth resistance measurement may be realised if the interference voltage does not exceed 24V The interference voltage is measured up to 100V but over 50V is it signalled as hazardous Do not connect the meter to a voltage exceeding 100V The clamps are not the part of meter basic accessories
48. tion Ei 096 Power supply voltage E2 0 not displayed Rx3 9990 0 3digits C R gt 3 9990 and Mm Temperature Es lt 1kQ aD eager 0 07 C Reiko 0 2 digits C 10 2 10 Additional uncertainties in accordance with IEC 61557 5 3P 4P 3P clamp Influencing factor Symbol Additional uncertainty Location 0 Power supply voltage E2 0 DHE not displayed R lt 3 999 Q 0 3digits C R gt 3 9990 and ue Temperature Es lt 1kO 0 2digits C 0 07 C 0 2 digits C In accordance with formula In Serial interference voltage E4 10 2 1 Uz 3V 50 60 400 16 2 3Hz Resistance of electrodes and E In accordance with the formula in auxiliary earth electrodes 5 10 2 3 11 Accessories 11 1 Basic accessories 30 cm probes 4 pieces WASONG30 2 2 metre black test lead with banana plugs at one end with a test prod WAPRZ2X2BLBB 25 metre blue WAPRZ025BUBBSZ and red WAPRZ025REBBSZ test leads 2 pieces with banana plugs at both ends wound upon reels which permit to elongate the test leads for the purpose of measurements of extensive earthing systems 1 2 metre red test lead WAPRZ1X2REBB 50 metre yellow shielded test lead wound upon a reel with banana plugs at both ends WAPRZO50YEBBSZE Black crocodile clip WAKROBL20K01 Red crocodile clip WAKRORE20K02 Vice WAZACIMA1 Rechargeable batteries WAAKUO7 Meter protective cover WAFUTL2 H
49. to charge the original accumulators It is powered from an external power supply It is also possible to use a car lighter socket MRU 200 OPERATING MANUAL Version 4 6 39 WARNING If the test leads are left in the sockets during replacement of the batteries or the package of accumulators there is a risk of electric shock with a dangerous voltage In order to replace the package of accumulators it is necessary to do the following e Remove all the test leads from the sockets and turn the meter off Remove the four screws of the accumulators batteries compartment in the lower part of the casing Remove the compartment Insert the compartment in the meter Replace the four screws of the accumulators batteries compartment NOTE Do not use the meter when the accumulator compartment is removed or open or power it from other sources than those mentioned in the present manual 6 3 Fuse replacement Remove the battery compartment to get access to two replaceable fuses FST 250Vac 1A 5x20mm and 2A 250Vac time delay fuse 5x20mm If the instrument or battery charger does not work before sending it for servicing check the fuses and if they are blown replace them with identical ones The fuses are placed in holders near the centre of the cavity To remove the fuses use a narrow tool e g a screwdriver 6 4 Charging of accumulators Charging commences once the power supply has been connected
50. to set the measuring voltage and press ENTER Press START to commerce measure ment The meter will activate the mode of selection of the distance between probes Use buttons W to set the dis tance between probes and press ENTER In order to commerce meas urement Read out the result 4 Current electrode resistance Voltage electrode resistance 4 Additional uncertainty caused by the resistance of the electrodes MRU 200 OPERATING MANUAL Version 4 6 The result is displayer for 20s It may be displayed again ENTER is pressed Notes A Earth resistance measurement may be realised if the interference voltage does not exceed 24V The interference voltage is measured up to 100V but over 50V is it signalled as hazardous Do not connect the meter to a voltage exceeding 100V Calculations are based upon the assumption that the distances between the specific measurement electrodes are equal the Wenner s method If this is not the case the earthing resistance measure ment must be realised by means of the four pole method and calculations must be performed individ ually Pay particular attention to the quality of the connection of the tested object with the test leads the contact area must be cleaned of paint rust etc If the resistance of the measurement probes is too high then the measurement of the RE earth electrode will be distorted by additional uncertainty A particularly h
51. to the meter regardless of the fact whether the meter is on or off During charging the screen looks as it is presented in the follow ing illustration The accumulators are charged in accordance with the algorithm of quick charge this process permits to reduce the duration of charging to approximately four hours The end of the process of charging is signalled by Charging concluded In order to turn the device off remove the power supply plug of the charger 40 MRU 200 OPERATING MANUAL Version 4 6 Operating mode Messages regarding the process of charging Battery charging 22 06 Charge progress Charging Progress the changing interior symbolizes charging Note As a result of interferences in the network it is possible that the process of charging of accumulators will finish too fast In the case too short a time of charging is detected it is necessary to remove the plug of the charger and start charging anew Additional information displayed by the meter Message Cause Proceeding Excessive voltage Check the contacts of the accu at the accumulator mulator package Should the package during problem persist replace the charging package No communication Check the contacts of the accu with the accumula mulator package Should the tor controller or bat problem persist replace the Battery connection error No pattery teries compartment package Put the accumulators put in compa
52. ts whose results determine the safety conditions of the installation Therefore in order to provide conditions for correct operation and the correctness of the obtained results the following recommendations must be observed Before you proceed to operate the meter acquaint yourself thoroughly with the present manual and observe the safety regulations and specifications determined by the producer The MRU 200 meter has been designed for the purpose of measurements of earth connection and equipotential bonding ground resistivity as well as clamps current measurements Any ap plication that differs from those specified in the present manual may result in a damage to the de vice and constitute a source of danger for the user The device must be operated solely by appropriately qualified personnel with relevant certificates to realise measurements of electric installation Operation of the meter realised by unauthorised personnel may result in damage to the device and constitute a source of danger for the user Using this manual does not exclude the need to comply with occupational health and safety regu lations and with other relevant fire regulations required during the performance of a particular type of work Before starting the work with the device in special environments e g potentially fire risk explosive environment it is necessary to consult it with the person responsible for health and safety It is unacceptable to operate the following
53. you have to purchase them apart MRU 200 OPERATING MANUAL Version 4 6 23 The clamp must be calibrated before it is used for the first time It may be periodically calibrated in order to avoid the influence of the ageing elements upon the resolution of measurements The clamp calibration option is in the MENU Pay particular attention to the quality of the connection of the tested object with the test leads the contact area must be cleaned of paint rust etc If the resistance of the measurement probes is too high then the measurement of the RE earth electrode will be distorted by additional uncertainty A particularly high measurement uncertainty is generated if we measure a low value of the earth resistance with probes of a weak contact with the ground such a situation occurs often if the earth electrode is properly made and the upper layer of the ground is dry and characterised by a low conductivity Then the relation between the probe re sistance and the resistance of the measured earthing is very high and so is the case of the meas urement uncertainty which depends on it What may be done then is to perform in accordance with the formulae specified in point 10 2 calculations which will permit to evaluate the influence of the measurement conditions It is also possible to improve the contact of the probe with the ground for example by means of moistening of the place when the probe is driven its driving into the ground in anothe

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