Sonel MRU-200 Operating Manual
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Sonel MRU-200 Operating Manual

Earth resistance meter
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Summary of Contents for Sonel MRU-200

  • Page 3: Operating Manual

    OPERATING MANUAL EARTH RESISTANCE METER MRU-200 SONEL S. A. ul. Wokulskiego 11 58-100 Świdnica Version 5.0 February 22, 2017...
  • Page 4 The MRU-200 meter is a modern, easy and safe measuring 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. MRU-200 OPERATING MANUAL Version 5.0...

  • Page 5: Table Of Contents

    AVING OF THE MEASUREMENT RESULTS IN THE MEMORY ....................41 EMORY ERASING ..................... 42 EMORY BROWSING DATA TRANSMISSION ..................43 ..............43 OMPUTER CONNECTION ACCESSORIES ............43 ONNECTION OF THE METER TO A COMPUTER OR-1 ..........43 ATA TRANSMISSION WITH RADIO MODULE MRU-200 OPERATING MANUAL Version 5.0...
  • Page 6 Additional uncertainties in accordance with IEC 61557-5 (3P, 4P, 3P + clamp) ....................56 ACCESSORIES ..................... 56 11.1 ................... 56 ASIC ACCESSORIES 11.2 ................. 57 DDITIONAL ACCESSORIES POSITIONS OF THE METER’S COVER ............58 MANUFACTURER ....................59 MRU-200 OPERATING MANUAL Version 5.0...

  • Page 7: Safety

     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.

  • Page 8: Menu

    The menu is available at any position of the knob. Press MENU. Using buttons highlight the required position. Press ENTER to select the option. Wireless transmission See chapter 5.3. Measurement settings Using buttons highlight the required position. Press ENTER to select the option. MRU-200 OPERATING MANUAL Version 5.0...

  • Page 9: Mains Frequency

    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. Calibration of hard clamps Having read the preliminary infor- mation ENTER. Follow the displayed instructions. MRU-200 OPERATING MANUAL Version 5.0...
  • Page 10 Calibration of flexible clamps (using ERP-1 adapter) After reading the intro- ductory information press ENTER. Follow on-screen prompts displayed by the meter and short H and E sockets with a wire. MRU-200 OPERATING MANUAL Version 5.0...
  • Page 11 Wrap the clamps around the wire referred to in sec. (up to 4 times). Use FLEX and TURNS buttons on ERP-1 adapter to select the clamps and number of wraps, according to the actual situation around the wire referred to in sec. MRU-200 OPERATING MANUAL Version 5.0...
  • Page 12 ERROR: CLAMP NOT CONNECTED whether it is placed OR NOT PUT ON WIRE upon the test lead CONNECTED TO H AND E SOCKET! used by the meter to force the pas- sage of current. MRU-200 OPERATING MANUAL Version 5.0...

  • Page 13: Earth Resistivity Settings

    ENTER 2.2.3 Earth resistivity settings Using buttons select the result and the distance unit and press ENTER to confirm. Meter settings 2.3.1 LCD contrast Using the buttons set the contrast value and press ENTER. MRU-200 OPERATING MANUAL Version 5.0...

  • Page 14: Lcd Backlight

    AUTO-OFF disable, press ENTER. 2.3.4 Display settings The setting permits to turn on/off the setting bar display. Use buttons to set the dis- play of the setting bar (measurement parameters), press ENTER. Visible bar Hidden bar MRU-200 OPERATING MANUAL Version 5.0...

  • Page 15: Date And Time

    Before you proceed to updating the programme, download from the manufacturer’s 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.

  • Page 16: Measurements

    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 5.0...

  • Page 17: Calibration Of The Test Leads

    (auto-zeroing). In order to do so the measurement function 2P includes the AUTOZERO subfunction. 3.2.1 Auto-zeroing on Turn the meter on. Set the rotational function selector at 2P. Press F1. Follow the displayed instructions. MRU-200 OPERATING MANUAL Version 5.0...

  • Page 18: Auto-Zeroing Off

    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. Set the rotational function selector at 2P. Press F1. Separate the test leads. Press START. MRU-200 OPERATING MANUAL Version 5.0...

  • Page 19: Measurement 3P

    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. MRU-200 OPERATING MANUAL Version 5.0...
  • Page 20 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 δ>30% MRU-200 OPERATING MANUAL Version 5.0...
  • Page 21 The uncertainty of the electrode resistance > 30%. (Un- LIMIT! certainties calculated on the basis of the measured val- ues) The value of the interfering signal is too high, NOISE! the result may be distorted by additional uncertainty. MRU-200 OPERATING MANUAL Version 5.0...

  • Page 22: Measurement 4P

    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 5.0...
  • Page 23 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 MRU-200 OPERATING MANUAL Version 5.0...
  • Page 24 The uncertainty of the electrode resistance > 30%. (Un- LIMIT! certainties calculated on the basis of the measured val- ues) The value of the interfering signal is too high, NOISE! the result may be distorted by additional uncertainty. MRU-200 OPERATING MANUAL Version 5.0...

  • Page 25: Measurement 3P + Clamp

    The auxiliary display shows the value of the interference voltage and its frequen- cy. The setting bar shows the mains fre- quency set in the MENU. Press button F2 to select measurement with C-3 clamp. MRU-200 OPERATING MANUAL Version 5.0...
  • Page 26 Read out the result. Current electrode resistance Voltage electrode resistance Additional uncertainty caused by the resistance of the electrodes. The result is displayer for 20s. It may be displayed again ENTER is pressed. MRU-200 OPERATING MANUAL Version 5.0...
  • Page 27 "R_H and R_S electrodes resistance are higher than 19.9 kΩ! 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. MRU-200 OPERATING MANUAL Version 5.0...

  • Page 28: Measurement 3P + Erp-1 Adapter

    The tested leg of the pole, the current electrode and the voltage electrode should be arranged in one line. Clamps should be attached to the tested leg of the pole below the connection point of E lead. Select voltage measurement as described in par. 3.5. MRU-200 OPERATING MANUAL Version 5.0...
  • Page 29 Press F2 button to select the measurement in ERP-1. buttons to select the meas- urement with ERP-1, press ENTER. Press F3 button to select the number of pole legs. MRU-200 OPERATING MANUAL Version 5.0...
  • Page 30 ENTER. Press START. Follow the command on the screen and fix the clamps to the first leg (if not already done). To start the measurement, press START push-button again. MRU-200 OPERATING MANUAL Version 5.0...

  • Page 31: Two-Clamp Measurement

    Two-clamp measurement Two-clamp measurements are applied where there 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. MRU-200 OPERATING MANUAL Version 5.0...
  • Page 32 Press START In order for the test to com- mence measurement. Read out the result. The result is displayer for 20s. It may be displayed again ENTER is pressed. MRU-200 OPERATING MANUAL Version 5.0...

  • Page 33: Measurement 4P

    The impulse method is used to determine the resultant earth impedance. Therefore the control measurement points must not be undone. It is recommended to place the test leads in such a manner that the angle between them is at least 60°. MRU-200 OPERATING MANUAL Version 5.0...
  • Page 34 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 placed in such a manner than the angle between the gauging aligned amount to 60°. MRU-200 OPERATING MANUAL Version 5.0...
  • Page 35 Read out the result. Current electrode resistance Voltage electrode resistance Additional uncertainty caused by the resistance of the electrodes. The result is displayer for 20s. It may be displayed again when ENTER is pressed. MRU-200 OPERATING MANUAL Version 5.0...

  • Page 36: Current Measurement

    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 several types of clamps, which differ in regard to diameter and measured current range (see Technical Data). MRU-200 OPERATING MANUAL Version 5.0...
  • Page 37 ENTER. Notes: - Measurements are continuous and there is no possibility of their being saved. - Flexible clamp F series may be used solely for the purpose of measurements of currents > 1A. MRU-200 OPERATING MANUAL Version 5.0...

  • Page 38: Earth Resistivity Measurements

    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 5.0...
  • Page 39 Press START to commerce measure- ment. The meter will activate the mode of selection of the distance between probes. Use buttons to set the dis- tance between probes and press ENTER In order to commerce meas- urement. MRU-200 OPERATING MANUAL Version 5.0...
  • Page 40 - If the resistance of H and S probes or one of them exceeds 19,9kΩ, an appropriate message is dis- played: "R_H and R_S electrodes resistance are higher than 19.9 kΩ! Measurement impossi- ble!". MRU-200 OPERATING MANUAL Version 5.0...
  • Page 41 The uncertainty of the electrode resistance > 30%. (Un- LIMIT! certainties calculated on the basis of the measured val- ues) The value of the interfering signal is too high, NOISE! the result may be distorted by additional uncertainty. MRU-200 OPERATING MANUAL Version 5.0...

  • Page 42: Memory

    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...

  • Page 43: Memory Erasing

    Memory erasing Note: - During the process of memory erasing the progress bar is being displayed. Turn the meter on. Set the rotational function selector at MEM. Using the buttons highlight “Memory erasing”. Press ENTER. MRU-200 OPERATING MANUAL Version 5.0...

  • Page 44: Memory Browsing

    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. MRU-200 OPERATING MANUAL Version 5.0...

  • Page 45: Data Transmission

    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 authorized distributor. The accessories may be used in case of many devices manufactured by SONEL S.A. which are equipped with the USB interface.
  • Page 46 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 SONEL READER programme manual for data filing.

  • Page 47: Power Supply

    Replacement of accumulators The MRU-200 meter is equipped with a package of NiMH 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 to charge the original accumulators.

  • Page 48: Fuse Replacement

    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. MRU-200 OPERATING MANUAL Version 5.0...
  • Page 49 The message is displayd for a deeply discharged while and then the precharge accumulator pack- process begins again. If after Precharge error several attempts the message: Battery temperature too high! is displayed, replace the pack- age. MRU-200 OPERATING MANUAL Version 5.0...

  • Page 50: Discharging Of Accumulators

    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 format them, it is recommended to charge the accumulators from time to time (even if not in use). MRU-200 OPERATING MANUAL Version 5.0...

  • Page 51: Cleaning And Maintenance

    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 MANUAL Version 5.0...

  • Page 52: Technical Data

    0,000...3,999Ω * 0,001Ω ±(2% m.v. + 4 digits) 4,00…39,99Ω 0,01Ω 40,0…399,9Ω 0,1Ω ±(2% m.v. + 2 digits) 400…3999Ω 1Ω 4,00…19,99kΩ 0,01kΩ ±(5% m.v. + 2 digits) * For 3-cable method in 0,000...0,045Ω range uncertainty is unspecified. MRU-200 OPERATING MANUAL Version 5.0...
  • Page 53 0,1Ωm 0,0..199,9Ωm 1Ωm 200..1999Ωm Depends on the basic un- certainty of the R 4P me- 0,01kΩm 2,00..19,99kΩm asurement but not less than ±1 digit. 0,1kΩm 20,0..99,9kΩm 100..999kΩm 1kΩm  distance between measurement probes (L): 1...50m MRU-200 OPERATING MANUAL Version 5.0...
  • Page 54 Signalling of insufficient clamp current for ................. ≤0,5 mA m) Power supply of the meter ......accumulator package type SONEL NiMH 4,8V 4,2 Ah n) parameters of AC adapter for the battery charge ......100 V…240 V, 50 Hz…60 Hz o) Number of measurements for R 2P ........

  • Page 55: Additional Data

    >1kΩ or >3,999Ω           >1kΩ or    >1kΩ and R [Ω], R [Ω] and R [Ω] are values which are displayed by the device. MRU-200 OPERATING MANUAL Version 5.0...

  • Page 56: Influence Of The Auxiliary Electrodes Upon Earth Resistance Measurements For Function Ρ

     >1 50 Ω 0,0…4,9Ω     5,0…199Ω        [Ω] and R [Ω] are values which are displayed by the device. MRU-200 OPERATING MANUAL Version 5.0...

  • Page 57: Influence Of The Interference Current I

    3P+clamp 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. Uncertainty [] ...

  • Page 58: Additional Uncertainties In Accordance With Iec 61557-5 (3P, 4P, 3P + Clamp)

     Harness 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) – WAZASZ7,  Operating manual. MRU-200 OPERATING MANUAL Version 5.0...

  • Page 59: Additional Accessories

    Transmission clamp N-1 into the ground WACEGC3OKR WACEGF1AOKR  Flexible clamp F-1A  Reception clamp C-3 WACEGF3AOKR WACEGF2AOKR  Flexible clamp F-2A  Flexible clamp F-3A WACEGF4AOKR WACEGFS2OKR  Flexible clamp F-4A  Flexible clamp FS-2 MRU-200 OPERATING MANUAL Version 5.0...

  • Page 60: Positions Of The Meter's Cover

    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 MRU-200 OPERATING MANUAL Version 5.0...

  • Page 61: Manufacturer

    SONEL S.A. ul. Wokulskiego 11 58-100 Świdnica 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 by the manufacturer. MRU-200 OPERATING MANUAL Version 5.0...
  • Page 62 NOTES MRU-200 OPERATING MANUAL Version 5.0...

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