Sonel MRU-200-GPS Operation Manual
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Sonel MRU-200-GPS Operation Manual

Earth/ground resistance meter
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  • Page 3: Operating Manual

    OPERATING MANUAL EARTH/GROUND RESISTANCE METER MRU-200-GPS SONEL TEST & MEASUREMENT, Inc. Santa Clara, Ca. USA SONEL S. A. Świdnica, Poland Version 1.06 Apr 12, 2017...
  • Page 4 +1 408 898 2215 CAUTION: Equipment changes or modifications not expressly approved by SONEL TEST & MEASUREMENT Inc., the party responsible for FCC compliance, could void the user’s au- thority to operate the equipment, and could create a hazardous condition.

  • Page 5: Table Of Contents

    AVING MEASUREMENT RESULTS IN THE MEMORY ....................43 RASING EMORY ..................... 44 EMORY BROWSING DATA TRANSMISSION ..................45 ..............45 OMPUTER CONNECTION ACCESSORIES ............45 ONNECTION OF THE METER TO A COMPUTER ..........45 ATA TRANSMISSION WITH LUETOOTH MODULE MRU-200-GPS OPERATING MANUAL Version 1.06...
  • Page 6 Additional uncertainties in accordance with IEC 61557-5 (3P, 4P, 3P + clamp) ....................57 ACCESSORIES ..................... 58 11.1 ................... 58 ASIC ACCESSORIES 11.2 ................. 58 DDITIONAL ACCESSORIES POSITIONS OF THE METER’S COVER ............60 MANUFACTURER ....................60 MRU-200-GPS OPERATING MANUAL Version 1.06...

  • Page 7: Safety

    • The MRU-200-GPS meter has been designed to test and measure the resistance of earth/ground connections and equipotential bonding, measure ground resistivity, as well as measure current. Any application that differs from those specified in this manual may result in damage to the de- vice and injury to the user.

  • Page 8: Menu

    Press MENU. Using buttons highlight the required position. Press ENTER to select the option. Wireless transmission See chapter 5.3. GPS settings Using buttons select GPS on or off. Press ENTER to select the op- tion. MRU-200-GPS OPERATING MANUAL Version 1.06...

  • Page 9: Measurement Settings

    = AUTO), by running a series of measurements to determine the level of local interference prior to performing the earth resistance measurement. The AUTO function is active if the interference voltage is ≥ 1V. Otherwise the meter adopts the last frequency value selected from the MENU. MRU-200-GPS OPERATING MANUAL Version 1.06...

  • Page 10: Calibration Of The Current Clamps

    Re- calibrate again after a clamp or probe has been replaced. Calibration of hard clamps Select Clamp calibration in 2.3 above and press ENTER. Follow the instructions. When calibration completes the display shows: MRU-200-GPS OPERATING MANUAL Version 1.06...
  • Page 11 Follow on-screen prompts displayed by the meter and short H and E sockets with a wire. Connect ERP-1 adapter to the terminal of the clamps. Turn ERP-1 adapter ON. Connect flexible clamps to ERP-1 adapter. MRU-200-GPS OPERATING MANUAL Version 1.06...
  • Page 12 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. MRU-200-GPS OPERATING MANUAL Version 1.06...

  • Page 13: Earth Resistivity Settings

    ERROR: CALIBRATION tion factor the connections COEFFICIENT OUT OF RANGE. and/or replace the CALIBRATION ABORTED. PRESS clamp. ENTER 2.3.3 Ground resistivity settings Using buttons select the desired op- tions for distance units and press ENTER. MRU-200-GPS OPERATING MANUAL Version 1.06...

  • Page 14: Meter Settings

    ON time, or AUTO-OFF disable, then press ENTER. 2.4.4 Display settings turn the Settings bar display that shows measurement parameters on or off use but- tons to select Yes or No, press ENTER. MRU-200-GPS OPERATING MANUAL Version 1.06...

  • Page 15: Date And Time

    Do not turn the meter off or disconnect the USB cable during the firmware update. Before updating the meter firmware download the latest meter software version from www.sonel.pl or www.soneltest.com. Save the file in the computer in a known folder or location, and MRU-200-GPS OPERATING MANUAL Version 1.06...

  • Page 16: Language Choice

    EN 61557-4 (U<24V, I>200mA or R≤10Ω). Turn the meter on. Set the rotary function selector switch at 2P. Connect the earth ground system to be measured to the terminals S and E of the meter. MRU-200-GPS OPERATING MANUAL Version 1.06...
  • Page 17 The voltage on the measurement points exceeds 24V >24V! but lower than 40V, the measurement is cancelled. The value of the interfering signal is too high, NOISE! the result may be distorted by additional uncertainty. MRU-200-GPS OPERATING MANUAL Version 1.06...

  • Page 18: Calibration Of The Test Leads

    2P. Press F1. Follow the displayed instructions. Once the auto-zero compensation has concluded the following will be displayed: Auto-zeroing enabled is indicated by AUTOZERO shown on the right-hand side of the display. MRU-200-GPS OPERATING MANUAL Version 1.06...

  • Page 19: Auto-Zeroing Off

    Measurement 3P The basic kind of the earth resistance measurement is three-pole measurement. Disconnect the earth ground electrode for the installation that is to be tested. MRU-200-GPS OPERATING MANUAL Version 1.06...
  • Page 20 The meter is ready for measurement. The auxiliary display shows the value of the interference voltage and its fre- quency. The settings bar shows the mains frequency set in the MENU. Press F1 to select the measuring voltage. MRU-200-GPS OPERATING MANUAL Version 1.06...
  • Page 21 If after several measurements, the R test results differ more than 3%, then significantly increase the distance between the current probe from the earth electrode under test, and repeat the measurement procedure again. MRU-200-GPS OPERATING MANUAL Version 1.06...
  • Page 22 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-GPS OPERATING MANUAL Version 1.06...

  • Page 23: Measurement 4P

    Connect the earth ground electrode under test to the E socket of the meter. Connect the ES socket to the earth ground electrode under test below the E cable. Align all electrodes in a straight line. MRU-200-GPS OPERATING MANUAL Version 1.06...
  • Page 24 Press F1 to select the measuring voltage. buttons to set the measuring voltage and press ENTER. Press START to begin measure- ment. View the result. Current probe resistance Voltage probe resistance Additional uncertainty caused by the resistance of the probes. MRU-200-GPS OPERATING MANUAL Version 1.06...
  • Page 25 19.9 kΩ! Measurement impossi- message: "R and R 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-GPS OPERATING MANUAL Version 1.06...

  • Page 26: Measurement 3P + Clamp

    Position the current clamp on the earth ground electrode under test below the E cable connection. The meter is ready for measurement. The auxiliary display shows the value of the interference voltage and its frequen- cy. The settings bar shows the mains frequency set in the MENU. MRU-200-GPS OPERATING MANUAL Version 1.06...
  • Page 27 Press button F2 to select measurement with a C-3 current clamp. buttons to select C-3 clamp and press ENTER. Press F1 to select the measuring volt- age. buttons to set the measur- ing voltage and press ENTER. MRU-200-GPS OPERATING MANUAL Version 1.06...
  • Page 28 3%, then significantly increase the distance between the current electrode from the earth electrode under test, and repeat the measurement procedure again. Notes: Flexible Rogowski current probes must not be used for this measurement. MRU-200-GPS OPERATING MANUAL Version 1.06...
  • Page 29 The uncertainty of the electrode resistance > 30%. (Un- LIMIT! certainties calculated on the basis of the measured val- ues) Excessive interfering current, the measurement error may >max exceed the basic error MRU-200-GPS OPERATING MANUAL Version 1.06...

  • Page 30: Measurement 3P + Erp-1 Adapter

    Attach the current probe around the pylon leg under test below the connection point of E as shown. Select voltage measurement as described in par. 3.5. Press F2 button to select the measurement for ERP-1. MRU-200-GPS OPERATING MANUAL Version 1.06...
  • Page 31 ERP-1, press ENTER. Press F3 button to select the number of pylon legs. MRU-200-GPS OPERATING MANUAL Version 1.06...
  • Page 32 After 5 seconds the meter transfers the R1 result to the window on the right side of the display and displays a message to attach the current probe around the next leg of the pylon. MRU-200-GPS OPERATING MANUAL Version 1.06...

  • Page 33: Two-Clamp Measurement

    Two-clamp measurements are used 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. Turn the meter on. Set the rotary function se- lector switch at MRU-200-GPS OPERATING MANUAL Version 1.06...
  • Page 34 The result is displayed for 20s. It may be displayed again when ENTER is pressed. Notes: 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. MRU-200-GPS OPERATING MANUAL Version 1.06...

  • Page 35: Measurement 4P (Impulse Method)

    Measuring leads must be completely unwound. Otherwise the result of the measurement may be incorrect. 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). MRU-200-GPS OPERATING MANUAL Version 1.06...
  • Page 36 Connect the earth ground electrode under test to the ES socket below the E ca- ble as shown. It is recommended to place the test leads in such a manner that the angle be- tween them is at least 60° - see diagram below. MRU-200-GPS OPERATING MANUAL Version 1.06...
  • Page 37 The settings bar shows the pulse shape; i.e. rise-time and duration. Press F1 to modify the pulse shape. Use buttons to select the pulse shape and press ENTER. MRU-200-GPS OPERATING MANUAL Version 1.06...
  • Page 38 It is also possible to im- prove the contact of probes by moistening where the probe is driven, or driving probes into other loca- MRU-200-GPS OPERATING MANUAL Version 1.06...

  • Page 39: Current Measurement

    The current measurement function simply measures current with a current clamp or probe. It may be used for example for measurement of leakage current in an installation. Sonel offers several types of clamps and probes, with various diameters and current ranges (see Technical Data).

  • Page 40: Earth Resistivity Measurements

    The result gives the resistivity value which is calculated auto- matically in accordance with the following formula: ρ = 2LR , (Wenner’s measurement method.) The method assumes equal distances between electrodes. Turn the meter on. Set the rotary function selector switch at ρ. MRU-200-GPS OPERATING MANUAL Version 1.06...
  • Page 41 Press F1 to change the measurement voltage. buttons to select the measuring voltage and press ENTER. Press START to begin measurement. The meter display will first request se- lecting of the distance between probes. MRU-200-GPS OPERATING MANUAL Version 1.06...
  • Page 42 Earth ground resistance measurement may be performed successfully if the in- terference 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. MRU-200-GPS OPERATING MANUAL Version 1.06...

  • Page 43: Memory

    Memory The MRU-200-GPS meters are equipped with a memory to store up to 990 results of resistance measurements. Individual measurements are saved in memory cells. The memory is divided into 10 banks of 99 cells each. Each result may be saved in a cell of a defined number, and in a selected bank.

  • Page 44: Saving Measurement Results In The Memory

    Banks are selected is via the buttons. To save press ENTER. If the cell is occupied, the following message will be displayed: Once the option has been selected with the buttons and press ENTER. MRU-200-GPS OPERATING MANUAL Version 1.06...

  • Page 45: Erasing Memory

    Erasing Memory Note: - During the process of erasing memory the progress bar is displayed. Turn the meter on. Set the rotary function selector switch at MEM. Using the buttons highlight “Erasing memory”. Press ENTER. MRU-200-GPS OPERATING MANUAL Version 1.06...

  • Page 46: Memory Browsing

    “Meas. 1/20” means the first measurement in a group of 20; cells 21 to 99 are empty. 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-GPS OPERATING MANUAL Version 1.06...

  • Page 47: Data Transmission

    - Data transmission is not possible during the charging of the batteries. Computer connection accessories The meter can be connected to a computer via the supplied USB cable, using the Sonel Reader software. The software can also be downloaded from www.soneltest.com or www.sone.pl.
  • Page 48 Set the required code with the cursors. Note: Standard pin for Bluetooth is "123". - The data transmission may be interrupted using the ESC button. - With the USB cable active the wireless transmission is not possible. MRU-200-GPS OPERATING MANUAL Version 1.06...

  • Page 49: Power Supply

    Replacement of batteries The MRU-200-GPS meter is equipped with a package of NiMH batteries and a charger. The bat- teries insert into the battery compartment. The charger is built in to the meter, and must be used only to charge the original batteries.

  • Page 50: Fuse Replacement

    During charging the screen shows the battery symbol. The batteries are quick-charged; the charge time to full charge is approximately four hours. Full charge is indicated by: Charging con- cluded. To turn the device off remove the power supply plug of the power adapter. MRU-200-GPS OPERATING MANUAL Version 1.06...

  • Page 51: Discharging Of Batteries

    Discharging of batteries To guarantee proper functioning of the batteries and charge-level indications, and prolong battery life, it is recommended to periodically discharge them completely and then re-charge them. To first discharge the batteries: MRU-200-GPS OPERATING MANUAL Version 1.06...

  • Page 52: General Principles Regarding 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 or very cold environments. Ob- serve the nominal working temperature: -10 to 50 C / 14 to 122 F. MRU-200-GPS OPERATING MANUAL Version 1.06...

  • Page 53: Cleaning And Maintenance

    10.1 Basic data Interference voltage measurement99 U (RMS) Range Resolution Basic uncertainty ±(2% m.v. + 3 digits) 0 to 100V  measurement for f 15 to 450 Hz  frequency of measurements – minimum two measurements/s MRU-200-GPS OPERATING MANUAL Version 1.06...
  • Page 54 * For 3-cable method in 0.000 to 0.045Ω range uncertainty is unspecified. Measurement of the auxiliary electrode resistance Range Resolution Basic uncertainty 0 to 999Ω 1Ω ±(5% (R ) + 8 dig- 1.00 to 9.99kΩ 0.01kΩ its) 10.0 to 19.9kΩ 0.1kΩ MRU-200-GPS OPERATING MANUAL Version 1.06...
  • Page 55 100 … 300A 1,2,3,4 – current clamp (diameter 52mm / 2.2ins) – C-3 – flexible Rogowski probe – F-1 – flexible Rogowski probe – FS-2 – flexible Rogowski probe – FSX-3  frequency range: 45 to 400Hz MRU-200-GPS OPERATING MANUAL Version 1.06...
  • Page 56 Maximum resistance of measurement electrodes ..............20 k Insufficient clamp current level ..................≤0,5 mA m) Power supply of the meter ........battery package type SONEL NiMH 4,8V 4,2 Ah n) AC adapter battery charger ..............100 V to 240 V, 50 H / 60 Hz o) Number of measurements for R 2P ........

  • Page 57: Additional Data

    ≤1 kΩ i R ≤1 kΩ within the range of the basic uncertainty >1 kΩ or >3,999 Ω           >1 kΩ or    >1 kΩ and R MRU-200-GPS OPERATING MANUAL Version 1.06...

  • Page 58: Influence Of The Auxiliary Electrodes Upon Earth Resistance Measurements For Function Ρ

    R  zakl ≤50     R  zakl     R  zakl >50     R  zakl If the interference current exceeds 3A the measurement is cancelled. MRU-200-GPS OPERATING MANUAL Version 1.06...

  • Page 59: Influence Of Interference Current Upon The Result Of The Earth Resistance Measurement Using Double Clamps

    R>3.999Ω and ±0.2digits/°C Temperature <1kΩ ±0.07%/°C R≥1kΩ ±0.2 digits/°C In accordance with formula In Serial interference voltage 10.2.1 (V =3V 50/60/400/16 2/3Hz) Resistance of electrodes and In accordance with the formula in auxiliary earth electrodes 10.2.3 MRU-200-GPS OPERATING MANUAL Version 1.06...

  • Page 60: Accessories

     Adapter to charge the battery from a 12V vehicle lighter socket – WAPRZLAD12SAM  Charger / AC adapter (for different countries) – WAZASZ7  Operating manual 11.2 Additional accessories Additional accessories are available from Sonel and authorized distributors: WASONG80 WACEGN1BB ...
  • Page 61 WACEGFS2OKR WACEGFSX3OKR   Flexible clamp FSX-3 Flexible clamp FS-2 WAWALXL3 WAFUTL3   80cm probe protective cover Case XL3 for the meter and accessories WAPOJ1 LSWGBMRU200  Certificate of calibration  Batteries compartment MRU-200-GPS OPERATING MANUAL Version 1.06...

  • Page 62: Positions Of The Meter's Cover

    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 performed only by an authorized Sonel service center. MRU-200-GPS OPERATING MANUAL Version 1.06...

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