Sonel MRU-30 Operation Manual
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Sonel MRU-30 Operation Manual

Earth resistance meter
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Summary of Contents for Sonel MRU-30

  • Page 3: Operating Manual

    OPERATING MANUAL EARTH RESISTANCE METER MRU-30 SONEL S. A. Wokulskiego 11 Str., 58-100 Świdnica, Poland Version 1.03 April 2017...
  • Page 4 The MRU-30 meter is a modern, high quality, easy to use and safe measuring device. Please ac- quaint yourself with the present manual in order to avoid measuring errors and prevent possible prob- lems related to operation of the meter.

  • Page 5: Table Of Contents

    POWER SUPPLY OF THE METER ..............40 ............40 ONITORING THE POWER SUPPLY VOLTAGE ........... 41 HARGING THE RECHARGEABLE BATTERY PACK ..........42 ENERAL PRINCIPLES OF USING BATTERIES CLEANING AND MAINTENANCE ..............43 STORAGE ......................43 DISMANTLING AND DISPOSAL ..............43 MRU-30 OPERATING MANUAL version 1.03...
  • Page 6 (3P + clamp) .... 48 12.2.6 Additional uncertainties in accordance with IEC 61557-5 (3p, 4p) ... 48 ACCESSORIES ..................... 49 13.1 ................... 49 TANDARD ACCESSORIES 13.2 ................. 49 DDITIONAL ACCESSORIES MANUFACTURER ....................50 TESTING AND CALIBRATION LABORATORY ........... 51 MRU-30 OPERATING MANUAL version 1.03...

  • Page 7: Safety

     The MRU-30 meter has been designed for the purpose of measurements of earth connection and equipotential bonding, and also ground resistivity, Any application that differs from those specified in the present manual may result in a damage to the device and constitute a source of danger for the user.

  • Page 8: Turning The Meter On And Activating Screen Backlit

    SET/SEL button pressed. When the Fn screen is displayed use to set mains frequency – 50 Hz or 60 Hz (50 Hz is set as default). buttons to enter the screen with audio message settings: bEEP. MRU-30 OPERATING MANUAL version 1.03...
  • Page 9 (dashes - Auto-OFF is disabled). This function turns off the meter automati- cally after the certain (set by user) period of time. buttons to enter the screen where the unit of length can be se- lected: diSt. MRU-30 OPERATING MANUAL version 1.03...
  • Page 10 7. After changing the parameters, you may exit SETUP menu: Press ENTER button to memorize settings (not applicable for Update screen) or use ESC button to go to the measurement screen without confirming the changes. MRU-30 OPERATING MANUAL version 1.03...

  • Page 11: Measurements

    ρ modes, before starting the measurement with the In 2P, 3P, 4P, 3P+C, R cont START button, MRU-30 is monitoring the voltage present on the measurement points (between E and other sockets). The value of the interfering voltage is dis- played on screen.

  • Page 12: Measurement Of Earth Connection And Equipotential Bonding (2P)

    25 V or 50 V. Press ENTER to confirm settings or press ESC to exit without saving the changes. Connect test leads according to the drawing. The meter is ready for measurement. Press START to commence measure- ment. MRU-30 OPERATING MANUAL version 1.03...

  • Page 13: Measurement 3P

    ‘NOISE!’ too high value, so the result may be distorted by additional uncertainty. Measurement 3P The basic type of the earth resistance measurement is three-pole measurement. Disconnect the tested earth electrode for the object installation. MRU-30 OPERATING MANUAL version 1.03...
  • Page 14 Connect the voltage electrode driven 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. The meter is ready for measurement. MRU-30 OPERATING MANUAL version 1.03...
  • Page 15 (such a situation occurs often if the earth electrode is properly made and the upper layer of the ground is dry and characterized by a low conductivity). Then the relation between the probe re- MRU-30 OPERATING MANUAL version 1.03...

  • Page 16: Measurement 4P

    It permits to eliminate the influence of the test leads resistance over the result of the measurement. In order to evaluate the resistivity of the ground it is recommended to use the dedicat- ed measurement function (point 4.9). Disconnect the tested earth electrode for the object installation. MRU-30 OPERATING MANUAL version 1.03...
  • Page 17 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 elec- trode should be aligned. MRU-30 OPERATING MANUAL version 1.03...
  • Page 18 If the R test results differ more than 3%, then it is necessary to significantly increase the distance between the current electrode from the earth elec- trode in question and repeat the measurement. MRU-30 OPERATING MANUAL version 1.03...
  • Page 19 30%. (Uncertainties calculated on the basis of the meas- % value ured values.) The resistance of H and S electrodes, or one of them ex- and R or R along ceeds 19,9 kΩ, the proper measurement is not possible. with Ω value MRU-30 OPERATING MANUAL version 1.03...

  • Page 20: Measurement 3 P + Clamp

    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. Attach the clamp around the tested earth electrode below the E cable connec- tion. MRU-30 OPERATING MANUAL version 1.03...
  • Page 21 ER – additional uncertainty caused by the re- sistance of the electrodes – interfering (noise) voltage – leakage current. The result is displayed for 20 s. It may be displayed again when ENTER is pressed. MRU-30 OPERATING MANUAL version 1.03...
  • Page 22 ‘NOISE!’ and xxV, >40V and a continuous sonic Where xx is the value of interfering voltage. The voltage signal , ‘NOISE!’ on the measurement points exceeds 40 V, the measure- ment is blocked. MRU-30 OPERATING MANUAL version 1.03...

  • Page 23: Two-Clamp Measurement

    The me- ter is in the mode of noise voltage meas- urement between measurement points and also it measures the current flowing through the receiving clamp. Connect test leads according to the drawing. MRU-30 OPERATING MANUAL version 1.03...
  • Page 24 Press START to commence measure- ment. Upon completing the measurement read out the result and the value of the leakage current. The result is displayed for 20 s. It may be displayed again when ENTER is pressed. MRU-30 OPERATING MANUAL version 1.03...

  • Page 25: Calibration Of The Measurement Clamp C-3

    The procedure of calibration must be carried out also after replacing clamp with the new one. While in mode (LED is on) press SET/SEL button to enter the screen where the clamps calibration can be per- formed. MRU-30 OPERATING MANUAL version 1.03...
  • Page 26 When the donE is displayed on the screen, the clamp calibration procedure is completed. MRU-30 OPERATING MANUAL version 1.03...

  • Page 27: Measurement Of Earth Connection And Equipotential Bonding (200Ma)

    << >> button to start the meas- urement of R (LED is on). CONT 200mA The meter is in the mode of noise voltage measurement between measurement points. Connect test leads according to the drawing. MRU-30 OPERATING MANUAL version 1.03...
  • Page 28 The result is displayed for 20 s. It may be displayed again when ENTER is pressed. Additional information displayed by the meter R>1999Ω Measurement range exceeded. >100V, >100V and a continuous sonic signal The voltage on the measurement points exceeds 100 V, the measurement is blocked. , ‘NOISE!’ and MRU-30 OPERATING MANUAL version 1.03...

  • Page 29: Calibration Of The Test Leads For Rcont Measurement

    Flashing AUTO-ZERO message indicates the readiness to com- mence the test leads calibration procedure. Connect test leads according to the drawing. Short-circuit the test leads connected to ‘E’ and ‘S’ sockets. Press START button. MRU-30 OPERATING MANUAL version 1.03...

  • Page 30: Earth Resistivity Measurement

    . From 1 to 50 m, with 1 m step, or from 1 to 150 ft, with 1 ft step. MRU-30 OPERATING MANUAL version 1.03...
  • Page 31 Connect the voltage electrode driven into ground to the S socket of the meter, Connect the voltage electrode driven into ground to the ES socket of the meter, Connect the current electrode driven into ground to the E socket of the meter. The meter is ready for measurement. MRU-30 OPERATING MANUAL version 1.03...
  • Page 32 (such a situation occurs often if the earth electrode is properly made and the upper layer of the ground is dry and characterized by a low conductivity). Then the relation between the probe re- MRU-30 OPERATING MANUAL version 1.03...
  • Page 33 Flashing symbols E or ES or H or S, or two of them, or three, or all of them at the same time – one or two or three or four test leads are disconnected from the measure- ment sockets. MRU-30 OPERATING MANUAL version 1.03...

  • Page 34: Memory Of Measurement Results

    Memory of measurement results The MRU-30 meter has memory divided into 10 banks of 99 cells each. Thanks to dynamic memory allocation, each of the memory cells can contain different quantity of single measurement results, depending on the needs. Optimal use of the memory can be ensured in this way. Each measurement result can be stored in a memory cell marked with a selected number and in a selected memory bank.
  • Page 35 - After the measurement, its result is shown on the display for 20 s or until:  the measurement function is changed,  Auto-OFF function is activated,  the meter detects interference voltage> 40 V,  one of the following operations is performed: MRU-30 OPERATING MANUAL version 1.03...

  • Page 36: Viewing Memory Data

    - Viewing test results components is disabled for R and 2P measurements. CONT Deleting memory data You can delete the entire memory or its individual cells or banks. 5.3.1 Deleting cell data << >> to browse the memory: MEM (LED is on). MRU-30 OPERATING MANUAL version 1.03...
  • Page 37 Press ENTER button again to delete the selected cell. After deleting the cell, the meter beeps three times. Press ESC to can- cel and return to memory browsing more MRU-30 OPERATING MANUAL version 1.03...

  • Page 38: Deleting Bank Data

    5.2. Set the cell number as ‘- -’ (before “01’) below screen will appear. then symbol ? will be displayed to indi- cate the readiness for deleting. Press ENTER button. MRU-30 OPERATING MANUAL version 1.03...

  • Page 39: Deleting The Whole Memory

    The content of the bank has been deleted. 5.3.3 Deleting the whole memory << >> to browse the memory: MEM (LED is on). Set the bank number as ‘- -’ (before ‘0’)... MRU-30 OPERATING MANUAL version 1.03...
  • Page 40 Press ENTER again. After deleting the memory, the meter beeps three times. Press ESC to cancel and return to memory browsing mode. The entire contents of the memory has been deleted. MRU-30 OPERATING MANUAL version 1.03...

  • Page 41: Data Transmission

    USB cable and appropriate software. If the required accessories have not been purchased along with the meter, then they are available from the manufacturer or an authorized distributor. The accessories may be used with other devices manufactured by SONEL S.A. which are equipped with the USB interface, or other (depending on the device).

  • Page 42: Firmware Update

    No battery symbol on screen (with charger connected) indicates that the battery is either disconnected or corrupted. Rechargeable batteries completely discharged. The meter switches off automati- cally after 5 seconds. MRU-30 OPERATING MANUAL version 1.03...

  • Page 43: Charging The Rechargeable Battery Pack

    Charging the rechargeable battery pack CAUTION! The MRU-30 meter is powered from SONEL battery pack, which includes NiMH 9.6 V batteries and it may be replaced only by the manufacturer's service department. Battery charger is installed inside the meter and cooperates only with the manufacturer’s rechargeable battery pack.

  • Page 44: General Principles Of Using Ni-Mh Batteries

    - Do not charge or use batteries in extreme temperatures. Extreme temperatures reduce the lifetime of batteries. Avoid placing devices powered from batteries in very hot environments. The nominal working temperature must be absolutely observed. MRU-30 OPERATING MANUAL version 1.03...

  • Page 45: 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 accumulators. MRU-30 OPERATING MANUAL version 1.03...

  • Page 46: Technical Specifications

    200 Ω…1999 Ω 1 Ω ±5% m.v. 2000 Ω…9999 Ω 1 Ω ±8% m.v. Measurement of the auxiliary electrode resistance Range Resolution Basic uncertainty 0...999 Ω 1Ω ±(5% (R 1,00...9,99 kΩ 0,01kΩ 8 digits) 10,0…19,9 kΩ 0,1kΩ MRU-30 OPERATING MANUAL version 1.03...
  • Page 47 1 Ωm uncertainty of the R 4P measurement 1,00..9,99 kΩm 0,01 kΩm not less than ±1 digit. 10,0..99,9 kΩm 0,1 kΩm 100..999 kΩm 1 kΩm  distance between measurement probes (L): 1...50 m or 1…150 ft MRU-30 OPERATING MANUAL version 1.03...
  • Page 48 Signalling of insufficient clamp current for ................. ≤0,5 mA m) Power supply of the meter ......rechargeable batteries type SONEL NiMH 9,6 V 2 Ah n) Parameters of AC adapter for the battery charger ......100 V…240 V, 50 Hz…60 Hz ........

  • Page 49: Additional Data

    3P+clamp The MRU-30 meter may perform a measurement, if the value of the interference current does not exceed 3 A rms and the frequency complies with the value set in the MENU.

  • Page 50: Influence Of Interference Current On The Result Of The Earth Resistance Measurement Using Double Clamps

    12.2.4 Influence of interference current on the result of the earth resistance measurement using double clamps The MRU-30 meter may perform a measurement, if the value of the interference current does not exceed 3 A rms and the frequency complies with the value set in the MENU.

  • Page 51: Accessories

     Power supply adaptor Z7 – WAZASZ7,  Calibtation certificate,  Operating manual,  Sonel CD with software and drivers. 13.2 Additional accessories Furthermore, the manufacturer and authorized distributors offer the following elements which are not included in the basic accessories package:...

  • Page 52: Manufacturer

    SONEL S. A. Wokulskiego 11 str. 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 carried out solely by the manufacturer. MRU-30 OPERATING MANUAL version 1.03...

  • Page 53: Testing And Calibration Laboratory

    15 Testing and Calibration Laboratory Research and Calibration Laboratory of SONEL SA offers calibration of the following instruments used for electrical/non-electrical measurements: meters for electrical protective measurements: insulation resistance, impedance and resistance of short-circuit loops, earthing resistances and earth resistivity, RCD parameters and multi-...
  • Page 54 NOTES MRU-30 OPERATING MANUAL version 1.03...

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