METREL MI 3290 Instruction Manual
  1. Manuals
  2. Brands
  3. METREL Manuals
  4. Measuring Instruments
  5. MI 3290
  6. Instruction manual

METREL MI 3290 Instruction Manual

Earth analyser
Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
Earth Analyser
MI 3290
Instruction manual
Version 1.3.4, Code No. 20 752 597

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the MI 3290 and is the answer not in the manual?

Questions and answers

Related Manuals for METREL MI 3290

Summary of Contents for METREL MI 3290

  • Page 1 Earth Analyser MI 3290 Instruction manual Version 1.3.4, Code No. 20 752 597...
  • Page 2 The trade names Metrel , Smartec , Eurotest , Auto Sequence are trademarks registered in Europe and other countries. No part of this publication may be reproduced or utilized in any form or by any means without permission in writing from METREL.
  • Page 3 i. About the instruction manual  This Instruction manual contains detailed information on the Earth Analyser, its key features, functionalities and use.  It is intended for technically qualified personnel responsible for the product and its use.  Please note that LCD screenshots in this document may differ from the actual instrument screens in details due to firmware variations and modifications.

  • Page 4: Table Of Contents

    MI 3290 Earth Analyser Table of contents Table of contents General Description .................... 8 Features ......................8 Safety and operational considerations ............. 9 Warnings and notes ..................9 Battery and charging of Li-ion battery pack ..........11 2.2.1 Precharge .................... 12 Li –...
  • Page 5 MI 3290 Earth Analyser Table of contents 8.9.5 Adding a new Workspace ..............36 8.9.6 Opening a Workspace ................. 37 8.9.7 Deleting a Workspace / Export ............37 8.9.8 Importing a Workspace ................ 38 8.9.9 Exporting a Workspace ................ 38 8.10...
  • Page 6 MI 3290 Earth Analyser Table of contents 11.7 Earth Potential [Us] ................... 101 11.7.1 Potential Measurement ..............102 11.7.2 Step and Touch Voltages Theory ............106 11.8 Pylon Ground Wire Test (PGWT) ............. 108 11.8.1 PGWT Measurement ................. 108 11.9 Current [I] ....................
  • Page 7 Appendix C – Functionality and placing of test probes ........147 Appendix D – Pulse and 3-pole example ............151 Appendix E – Programming of Auto Sequences® on Metrel ES Manager ..152 Appendix F – The balancing procedure .............. 159...

  • Page 8: General Description

    1 General Description 1.1 Features Earth Analyser (MI 3290) is a Multi-function, portable battery (Li-ion) or mains powered test instrument with excellent IP protection: IP65 (case closed), IP54 (case opened), intended for diagnosing of: Earth Resistance, Earth Impedance, Selective Earth Impedance, Specific Earth Resistance, Earth Potential, DC Resistance, AC Impedance and Impulse Impedance.

  • Page 9: Safety And Operational Considerations

    2.1 Warnings and notes In order to maintain the highest level of operator safety while carrying out various tests and measurements Metrel recommends keeping your Earth Analyser instruments in good condition and undamaged. When using the instrument, consider the following general warnings: ...
  • Page 10 MI 3290 Earth Analyser Safety and operational considerations Warnings related to measurement functions: Working with the instrument Use only standard or optional test accessories supplied by your distributor!  Always connect accessories to the test equipment and to the test object before starting ...

  • Page 11: Battery And Charging Of Li-Ion Battery Pack

    MI 3290 Earth Analyser Safety and operational considerations 2.2 Battery and charging of Li-ion battery pack The instrument is designed to be powered by rechargeable Li-ion battery pack or with mains supply. The LCD contains an indication of battery condition and the power source (upper left section of LCD).

  • Page 12: Precharge

    MI 3290 Earth Analyser Safety and operational considerations Typical charging profile which is also used in this instrument is shown in Figure 2.4. Current Regulation LOWV CH/8 Precharge Fastcharge Safety Time Time Figure 2.4: Typical charging profile where: ........Battery charging voltage ........
  • Page 13 MI 3290 Earth Analyser Safety and operational considerations Typical charging time is 3 hours in the temperature range of 5°C to 60°C. Charge Charge Charge Suspended Suspended ch/8 Temperature Figure 2.7: Typical charging current vs temperature profile where: ........Cold temperature threshold (typ. -15°C) ........

  • Page 14: Li - Ion Battery Pack Guidelines

    MI 3290 Earth Analyser Safety and operational considerations 2.2.2 Li – ion battery pack guidelines Li – ion rechargeable battery pack requires routine maintenance and care in their use and handling. Read and follow the guidelines in this Instruction manual to safely use Li – ion battery pack and achieve the maximum battery life cycles.

  • Page 15: Standards Applied

    MI 3290 Earth Analyser Safety and operational considerations 2.3 Standards applied The Earth Analyser instrument is manufactured and tested in accordance with the following regulations: Electromagnetic compatibility (EMC) EN 61326 Electrical equipment for measurement, control and laboratory use – EMC requirements Class A...

  • Page 16: Terms And Definitions

    MI 3290 Earth Analyser Terms and definitions 3 Terms and definitions For the purposes of this document and instrument Earth Analyser, the following definitions apply. Index: Unit: Description: [Ω] Earth resistance of complete system. [Ω] Earth impedance of complete system.

  • Page 17: Instrument Description

    MI 3290 Earth Analyser Instrument description 4 Instrument description 4.1 Instrument casing The instrument is housed in a plastic box that maintains the protection class defined in the general specifications. 4.2 Operator’s panel The operator’s panel is shown in Figure 4.1 below.
  • Page 18 MI 3290 Earth Analyser Instrument description Flex clamp 4 input terminal CLAMP Iron clamp input terminal Keypad (see section 6.1 General meaning of keys) USB communication port (standard USB connector - type B) Input power supply socket (type C7) Warnings! Do not connect test terminals (H, S, ES, E) to an external voltage higher than 300 V ...

  • Page 19: Accessories

    See attached list for standard configuration and options or contact your distributor or see the METREL home page: http://www.metrel.si. MI 3290 Earth Analyser is available in multiple sets with a combination of different accessories and measurement functions. The functionality of an existing set can be expanded by ordering additional accessory and license keys.

  • Page 20: Instrument Operation

    MI 3290 Earth Analyser Instrument operation 6 Instrument operation The Earth Analyser instrument can be manipulated via a keypad or touch screen. 6.1 General meaning of keys Cursor keys are used to: select appropriate option;  decrease, increase the selected parameter.

  • Page 21: Virtual Keyboard

    MI 3290 Earth Analyser Instrument operation 6.3 Virtual keyboard Figure 6.1: Virtual keyboard Toggle case between lowercase and uppercase. Active only when alphabetic characters’ keyboard layout selected. Backspace Clears last character or all characters if selected (If held for 2 s, all characters are selected).

  • Page 22: Display And Sound

    MI 3290 Earth Analyser Instrument operation 6.4 Display and sound 6.4.1 Battery and time indication The battery indication indicates the charge condition of battery and connection of external charger. Battery capacity indication. Low battery. Recharge the battery cells. Battery is full.
  • Page 23 MI 3290 Earth Analyser Instrument operation Previous screen view. Next screen view. Previous screen result or increase parameter. Next screen result or decrease parameter. Edit chart (zoom in or zoom out, and move cursor). Opens help screen. Views results of measurement.

  • Page 24: Sound Indication

    MI 3290 Earth Analyser Instrument operation Test leads resistance in Ω - Meter (200 mA and 7 mA) measurement is compensated. Low test current through Iron or Flex clamps. Results may be impaired. See chapter 15.10 Influence of low test current through clamps.

  • Page 25: Help Screens

    MI 3290 Earth Analyser Instrument operation 6.4.5 Help screens Opens help screen. Help menus are available in all functions. The Help menu contains schematic diagrams for illustrating proper connection of the instrument to the test object. After selecting the measurement, you want to perform, press the HELP key in order to view the associated Help menu.

  • Page 26: Main Menu

    MI 3290 Earth Analyser Main menu 7 Main menu 7.1 Instruments main menu From the Main menu different main operation menus can be selected. Figure 7.1: Main menu Options in main menu: Single Tests Menu with single tests, see chapter 11 Tests and Measurements for more information.

  • Page 27: General Settings

    MI 3290 Earth Analyser General Settings 8 General Settings In the General settings menu general parameters and settings of the instrument can be viewed or set. Figure 8.1: General settings menu Options in General Settings menu: Language Language Instrument language selection. Refer to chapter 8.1 more information.

  • Page 28: Language

    MI 3290 Earth Analyser General Settings 8.1 Language In this menu the language of the instrument can be set. Figure 8.2: Language menu 8.2 Power Save In this menu different options for decreasing power consumption can be set. Figure 8.3: Power save menu Brightness Setting level of LCD brightness level.

  • Page 29: Date And Time

    MI 3290 Earth Analyser General Settings 8.3 Date and time In this menu the date and time of the instrument can be set. Figure 8.4: Setting date and time 8.4 Instrument profiles In this menu the instrument profile can be selected from the available ones.

  • Page 30: Settings

    MI 3290 Earth Analyser General Settings Before deleting the selected profile user is asked for confirmation. Expands control panel / open more options. 8.5 Settings In this menu different general parameters can be set. Figure 8.6: Settings menu Available selection Description Keys &...

  • Page 31: Initial Settings

    MI 3290 Earth Analyser General Settings 8.6 Initial Settings In this menu the instrument settings, measurement parameters and limits can be set to initial (factory) values. Figure 8.7: Initial settings menu Warning: Following customized settings will be lost when setting the instruments to initial settings: Measurement limits and parameters.

  • Page 32: Auto Sequence® Groups

    MI 3290 Earth Analyser General Settings 8.8 Auto Sequence® groups The Auto Sequences® in Earth Analyser can be organized in lists of Auto Sequences®. In a list, a group of similar Auto Sequences® is stored. The Auto Sequence® groups menu is intended to manage with different lists of Auto Sequences®...

  • Page 33: Selecting A List Of Auto Sequences

    MI 3290 Earth Analyser General Settings 8.8.3 Selecting a list of Auto Sequences® Procedure A list of Auto Sequences® can be selected  from the Auto Sequence® groups menu. Enters option for selecting a list. Selected list of Auto Sequences® is marked ...

  • Page 34: Workspace Manager

    8.9.1 Workspaces and Exports The works with MI 3290 can be organized and structured with help of Workspaces and Exports. Exports and Workspaces contain all relevant data (measurements, parameters, limits, structure objects) of an individual work.

  • Page 35: Operations With Workspaces

    MI 3290 Earth Analyser General Settings 8.9.3 Operations with Workspaces Only one Workspace can be opened in the instrument at the same time. The Workspace selected in the Workspace Manager will be opened in the Memory Organizer. Figure 8.11: Workspaces menu Options Marks the opened Workspace in Memory Organizer.

  • Page 36: Adding A New Workspace

    MI 3290 Earth Analyser General Settings 8.9.5 Adding a new Workspace Procedure New Workspaces can be added from the  Workspace Manager screen. Enters option for adding a new Workspace.  Keypad for entering name of a new Workspace is displayed after selecting New.

  • Page 37: Opening A Workspace

    MI 3290 Earth Analyser General Settings 8.9.6 Opening a Workspace Procedure Workspace can be selected from a list in  Workspace manager screen. Opens a Workspace in Workspace manager.  The opened Workspace is marked with a blue dot. The previously opened Workspace will close automatically.

  • Page 38: Importing A Workspace

    MI 3290 Earth Analyser General Settings Workspace / Export is removed from the  Workspace / Export list. 8.9.8 Importing a Workspace Select an Export file to be imported from  Workspace Manager Export list. Enters option Import.  Before the import of the selected file the user is asked for confirmation.
  • Page 39 MI 3290 Earth Analyser General Settings Enters option Export.  Before exporting the selected Workspace, the user is asked for confirmation. Workspace is exported to Export file and is added to the list of Exports. Note:   If an Export file with the same name already...

  • Page 40: User Accounts

    MI 3290 Earth Analyser General Settings 8.10 User accounts The demand to sign in can prevent from unauthorized persons to work with the instrument. In this menu user accounts can be managed:  Setting if signing in to work with the instrument is required or not.

  • Page 41: Changing User Password, Signing Out

    MI 3290 Earth Analyser General Settings Sign in with selected user name. Enter the password and confirm. The user password consists of an up to 4 digit number. Administrator signing in The Account manager menu is accessed by selecting Account manager in Sign in menu or User profile menu.

  • Page 42: Managing Accounts

    MI 3290 Earth Analyser General Settings 8.10.3 Managing accounts Figure 8.15: Account manager menu Options The Account manager menu is accessed by selecting Account manager in Sign in menu or User profile menu. The account manager password must be entered and confirmed first.
  • Page 43 MI 3290 Earth Analyser General Settings Enters procedure for changing the account manager (administrator) password. To change the password the actual and then the new password should be entered and confirmed. Enters menu for editing user accounts. Figure 8.16: Edit accounts menu Options Opens the window for adding a new user.

  • Page 44: Memory Organizer

    MI 3290 Earth Analyser Memory Organizer 9 Memory Organizer Memory Organizer is a tool for storing and working with test data. 9.1 Memory Organizer menu Earth Analyser instrument has a multi-level structure. The hierarchy of Memory organizer in the tree is shown on Figure 9.1. The data is organized according to the project, object (building, power station, sub-station, transmission tower, …) and device under test (lightning rod, grounding rod,...

  • Page 45: Structure Items

    MI 3290 Earth Analyser Memory Organizer at least one single test in the Auto Sequence® was carried out and there were no other passed or failed single tests. empty Auto Sequence® with empty single tests 9.1.2 Structure items Each Structure item has: an icon ...

  • Page 46: Operations In Tree Menu

    MI 3290 Earth Analyser Memory Organizer Note: There is no status indication if all measurement results under each structure item /sub-item  have passed or if there is an empty structure item / sub-item (without measurements). 9.1.4 Operations in Tree menu In the Memory organizer different actions can be taken with help of the control panel at the right side of the display.
  • Page 47 MI 3290 Earth Analyser Memory Organizer 9.1.4.2 Operations on Structure items The structure item must be selected first. Figure 9.4: A structure project is selected in the Tree menu Options Starts a new measurement. Type of measurement (Single test or Auto Sequence®) should be selected first. After proper type is selected, the instrument goes to Single Test or Auto Sequence®...
  • Page 48 MI 3290 Earth Analyser Memory Organizer Renames a Structure item. Selected Structure item can be renamed via keypad. Refer to chapter 9.1.4.13 Rename a Structure item for more information. 9.1.4.3 View / Edit parameters and attachments of a Structure The parameters and their content are displayed in this menu. To edit the selected parameter, tap on it or press tab key followed by enter key to enter menu for editing parameters.
  • Page 49 MI 3290 Earth Analyser Memory Organizer Comments Complete comment (not shorted) attached  to the structure object can be seen on this screen. 9.1.4.4 Add a new Structure item This menu is intended to add new structure item in the tree menu. A new structure item can be selected and then added in the tree menu.
  • Page 50 MI 3290 Earth Analyser Memory Organizer 9.1.4.5 Add a new measurement In this menu new empty measurements can be set and then added in the structure tree. The type of measurement, measurement function and its parameters are first selected and then added under the selected Structure item.
  • Page 51 MI 3290 Earth Analyser Memory Organizer New empty measurement is added under  the selected Structure project. 9.1.4.6 Clone a Structure item In this menu selected structure item can be copied (cloned) to same level in the structure tree. Cloned structure item have same name as original.
  • Page 52 MI 3290 Earth Analyser Memory Organizer 9.1.4.7 Clone a measurement By using this function a selected empty or finished measurement can be copied (cloned) as an empty measurement to the same level in the structure tree. Procedure  Select the measurement to be cloned.
  • Page 53 MI 3290 Earth Analyser Memory Organizer The Paste structure menu is displayed. Before copying it can be set which sub- elements of the selected structure item will  be copied too. Refer to chapter 9.1.4.9 Cloning and Pasting sub-elements of...
  • Page 54 MI 3290 Earth Analyser Memory Organizer 9.1.4.10 Copy & Paste a measurement In this menu selected measurement can be copied to any allowed location in the structure tree. Procedure  Select the measurement to be copied.  Select Copy in Control panel.
  • Page 55 MI 3290 Earth Analyser Memory Organizer  A confirmation window will appear. Selected structure item sub- elements are removed.  Returns to the tree menu without changes.  Structure without deleted structure item. 9.1.4.12 Delete a measurement In this menu selected measurement can be deleted.
  • Page 56 MI 3290 Earth Analyser Memory Organizer  Structure without deleted measurement. 9.1.4.13 Rename a Structure item In this menu selected Structure item can be renamed. Procedure  Select the structure item to be renamed. Select Rename in Control panel. Virtual keypad will appear on screen. Enter ...
  • Page 57 MI 3290 Earth Analyser Memory Organizer Measurement is recalled.  Parameters and limits can be viewed but cannot be edited.  Select Retest in Control panel. Measurement retest starting screen is  displayed. Parameters and limits can be viewed and ...

  • Page 58: Single Tests

    MI 3290 Earth Analyser Single Tests 10 Single tests Single measurements and tests can be selected in the main Single tests menu or in Memory organizer’s main and sub-menus. 10.1 Selection modes In Single tests main menu four modes for selecting single tests are available.

  • Page 59: Single Test Screens

    MI 3290 Earth Analyser Single Tests This selection mode fastest working with the keypad. Groups of single tests are organized in a row. For the selected group all single tests are displayed and easy accessible with up /down keys. 10.1.1 Single test screens In the Single test screens measuring results, sub-results, limits and parameters of the measurement are displayed.

  • Page 60: Setting Parameters And Limits Of Single Tests

    MI 3290 Earth Analyser Single Tests Result field: main result(s)  sub-result(s)  PASS / FAIL indication  number of screens  Warning symbols and message field 10.1.2 Setting parameters and limits of single tests Procedure Select the test or measurement.

  • Page 61: Single Test Result Screen

    MI 3290 Earth Analyser Single Tests Accepts a new parameter or limit value and exits Set value menu. Accepts the new parameters and limit  values. 10.1.3 Single test result screen Figure 10.2: Single test result screen Example of 4 -pole measurement Options (after measurement is finished) Starts a new measurement.

  • Page 62: Graph View

    MI 3290 Earth Analyser Single Tests and limits of single tests for more information how to change measurement parameters and limits. long on Enters cross selector to select test or measurement. 10.1.4 Graph view Figure 10.3: Graph result screen (Example of 4 –pole sweep measurement) Options Plot edit.

  • Page 63: Recall Single Test Result Screen

    MI 3290 Earth Analyser Single Tests 10.1.5 Recall single test result screen Figure 10.4: Recalled results of selected measurement, example of 4 -pole measurement recalled results Options Retest Enters starting screen for a new measurement. Opens menu for changing parameters and limits of selected measurements.

  • Page 64: Single Test (Visual Test) Screens

    MI 3290 Earth Analyser Single Tests 10.1.6 Single test (Visual Test) screens Visual Test can be treated as a special class of tests. Items to be visually checked are displayed. In addition on-line statuses and other information are displayed. Selected Visual Test...

  • Page 65: Single Test (Visual Test) Screen During Test

    MI 3290 Earth Analyser Single Tests 10.1.8 Single test (Visual Test) screen during test Figure 10.7: Visual Test screen during test Options (during test) Selects item Applies a pass to the selected item or group of items. Applies a fail to the selected item or group of items.

  • Page 66: Single Test (Visual Test) Result Screen

    MI 3290 Earth Analyser Single Tests 10.1.9 Single test (Visual Test) result screen Figure 10.8: Visual Test result screen Options (after Visual Test is finished) Starts a new Visual Test. Saves the result. A new Visual Test was selected and started from a Structure object in the structure tree: The Visual Test will be saved under the selected Structure object.

  • Page 67: Single Test (Visual Test) Memory Screen

    MI 3290 Earth Analyser Single Tests 10.1.10 Single test (Visual Test) memory screen Figure 10.9: Visual Test memory screen Options Retest Enters starting screen and starts the new Visual test. Set cursor for viewing data on multiple pages.

  • Page 68: Tests And Measurements

    MI 3290 Earth Analyser Tests and Measurements 11 Tests and Measurements 11.1 Visual tests Visual test are used as guidance to maintain safety standards prior testing. To use those visual tests please select VISUAL under Single tests. Visual tests are prepared to make all safety checks before starting the test.
  • Page 69 MI 3290 Earth Analyser Tests and Measurements High voltages can occur if neutrals are disconnected from energized Pass/Fail/Clear/Checked equipment. Table 11.3: Visual Test – Hazards During Test After Test Reminder No. Description Values All test leads promptly removed after the test is completed.

  • Page 70: Earth Measurements [Ze And Re]

    Main installation earthing arrangements, lightning systems, local earthings, soil resistivity, etc. can be verified with the Earth tester. The MI 3290 Earth Analyser is able to carry out Earth measurement using different methods. The appropriate one is selected by the operator depending on the particular earthing system to be tested.

  • Page 71: Pole Measurement

    MI 3290 Earth Analyser Tests and Measurements 11.2.1 2 – pole Measurement The two-pole measurement can be used if there is a well-grounded auxiliary terminal available (e.g. source/ distribution earthings via the neutral conductor, water pipeline…). The main advantage of this method is that no test probes are needed for the test. The method is fast and relatively reliable.
  • Page 72 MI 3290 Earth Analyser Tests and Measurements Test can be started from the 2 - pole measurement window. Before carrying out a test the following parameters (Test Mode, Test Voltage, Test Frequency, Distance and Limit (Ze)) can be edited. Figure 11.9: 2 - pole measurement menu Test parameters for 2 –...

  • Page 73: Pole Measurement

    MI 3290 Earth Analyser Tests and Measurements 11.2.2 3 – pole Measurement The three-pole measurement is the standard earthing test method. It is the only choice if there is no well earthed auxiliary terminal available. The measurement is performed with two earthing probes.
  • Page 74 MI 3290 Earth Analyser Tests and Measurements Test can be started from the 3 - pole measurement window. Before carrying out a test the following parameters (Test Mode, Test Voltage, Test Frequency, Distance and Limit (Ze)) can be edited. Figure 11.13: 3 - pole measurement menu Test parameters for 3 –...

  • Page 75: Pole Measurement

    MI 3290 Earth Analyser Tests and Measurements 11.2.3 4 – pole Measurement The advantage for using of four-pole test is that the leads and contact resistances between measuring terminal E and tested item do not influence the measurement. MI 3290 Earth Analyser...
  • Page 76 MI 3290 Earth Analyser Tests and Measurements Test can be started from the 4 - pole measurement window. Before carrying out a test, the following parameters (Test Mode, Test Voltage, Test Frequency, Distance and Limit (Ze)) can be edited. Figure 11.17: 4 - pole measurement menu Test parameters for 4 –...

  • Page 77: Selective (Iron Clamp) Measurement

    MI 3290 Earth Analyser Tests and Measurements 11.2.4 Selective (Iron Clamp) Measurement This measurement is applicable for measuring selective earth resistances of individual earthing points in an earthing system. The earthing rods do not need to be disconnected during measurement. 4-pole wiring is used for this measurement.
  • Page 78 MI 3290 Earth Analyser Tests and Measurements Test can be started from the Selective (Iron Clamp) measurement window. Before carrying out a test the following parameters (Test Mode, Clamp Type, Test Frequency, Distance and Limit (Zsel)) can be edited. Figure 11.21: Selective (Iron Clamp) measurement menu...

  • Page 79: Clamps Measurement

    MI 3290 Earth Analyser Tests and Measurements 11.2.5 2 Clamps Measurement This measurement system is used when measuring earth impedances of grounding rods, cables, under- earth connections, etc. The measuring method needs a closed loop to be able to generate test currents. It is especially suitable for use in urban areas because there is usually no possibility to place the test probes.
  • Page 80 MI 3290 Earth Analyser Tests and Measurements Test can be started from the 2 Clamps measurement window. Before carrying out a test the following parameters (Measurement Clamp Type, Test Frequency, Generator Clamp Type and Limit (Ze)) can be edited. Figure 11.25: 2 Clamps measurement menu...

  • Page 81: Hf-Earth Resistance (25 Khz) Measurement

    MI 3290 Earth Analyser Tests and Measurements 11.2.6 HF-Earth Resistance (25 kHz) Measurement If the tested objects have in addition to a local earthing also a remote earthing, like overhead grounding wires (OHGW) or both side grounded shielded underground cable or any other galvanic connection to remote grounding, a measurement of local earthing with classic 3 or 4 pole method is not possible without disconnecting the remote grounding.
  • Page 82 MI 3290 Earth Analyser Tests and Measurements Notes: Automatic compensation of inductive components.  Explanation: The impedance Ze is measured and the value of the earth resistance Re is then derivated out of that impedance. Overhead grounding wire (OHGW) of tower 1 and 2.
  • Page 83 MI 3290 Earth Analyser Tests and Measurements Notes:  Consider displayed warnings when starting the measurement!  High noise currents and voltages in earth could influence the measurement results. The tester displays the “noise” warning in this case. Notes (Probes): ...

  • Page 84: Selective (Flex Clamps 1 - 4) Measurement

    MI 3290 Earth Analyser Tests and Measurements 11.2.7 Selective (Flex Clamps 1 - 4) Measurement This measurement is applicable for measuring selective earth resistances of individual earthing points of an earthing system - Typical example is a pillar of the power line. The connection to remote earthing (OHGW) rods does not need to be disconnected during the measurement.
  • Page 85 MI 3290 Earth Analyser Tests and Measurements Refer to Appendix F – The balancing procedure for more information on sub-procedure of the Selective Flex method. Test can be started from the Selective (Flex Clamps 1-4) measurement window. Before carrying out a test the following parameters (Test Mode, Test Frequency, Number of turns F1 - F4, Distance and Limit (Z ) can be edited.

  • Page 86: Passive (Flex Clamps) Measurement

    MI 3290 Earth Analyser Tests and Measurements Notes:  Consider displayed warnings when starting the measurement!  High noise currents and voltages in earth could influence the measurement results. The tester displays the “noise” warning in this case.  When measuring at high frequencies use the guard terminal and shielded cable (H).
  • Page 87 MI 3290 Earth Analyser Tests and Measurements where: ........Total selected earth impedance ........ Selected Earth impedance sel1-4/1 ........Inductive current or grounding wire current ........Measured current with Flex clamp f1-4 ........Test voltage between S and E terminal Note: “Inductive current”...
  • Page 88 MI 3290 Earth Analyser Tests and Measurements Figure 11.39: Example of Figure 11.40: Example of Passive (Flex Clamps) Passive (Flex Clamps) measurement result – Z measurement result - Z sel1-4 Notes:  Consider displayed warnings when starting the measurement! ...

  • Page 89: Specific Earth Resistance Measurements [Ρ]

    / ft 20 / 40 V Table 11.41: Available Specific Earth Resistance measurements in the MI 3290 11.3.1 General on specific earth What is Specific Earth Resistance? It is the resistance of ground material shaped as a cube 1 m × 1 m × 1 m, where the measurement electrodes are placed at the opposite sides of the cube, see the figure below.

  • Page 90: Wenner Method Measurement

    MI 3290 Earth Analyser Tests and Measurements 11.3.2 Wenner method Measurement Place the four earth probes on a straight line, at a distance a from one another and at a depth b < a/20. Distance a must be between 0.1 m and 49.9 m. Connect the cables to the probes, then to terminals H, S, ES, and E.
  • Page 91 MI 3290 Earth Analyser Tests and Measurements Test can be started from the Wenner method measurement window. Before carrying out a test the following parameters (Test Voltage, Distance (a) and Limit (ρ)) can be edited. Figure 11.44: Wenner method measurement menu...

  • Page 92: Schlumberger Method Measurement

    MI 3290 Earth Analyser Tests and Measurements 11.3.3 Schlumberger method Measurement Place the two earth probes (ES and S) at a distance d from one another and place the second two earth probes (E and H) at a distance a from ES and S probes. All probes must be placed on a straight line and to a depth of b, considering the condition b <<...
  • Page 93 MI 3290 Earth Analyser Tests and Measurements Test can be started from the Schlumberger method measurement window. Before carrying out a test the following parameters (Test Voltage, Distance (a), Distance (d) and Limit (ρ)) can be edited. Figure 11.47: Schlumberger method measurement menu...

  • Page 94: Impulse Impedance [Zp]

    MI 3290 Earth Analyser Tests and Measurements 11.4 Impulse Impedance [Zp] The impulse impedance of an earthing system is a useful parameter, to predict the behaviour in transient conditions, as it provides a direct relationship between the peak potential rise and the peak current rise.
  • Page 95 MI 3290 Earth Analyser Tests and Measurements Test can be started from the Impulse measurement window. Before carrying out a test the parameters (Distance and Limit (Zp)) can be edited. Figure 11.50: Impulse measurement menu Test parameters for Impulse: Distance (r) Distance between E and S probe (user defined).

  • Page 96: Dc Resistance [R]

    2-wire 7 mA Table 11.52: Available DC Resistance measurements in the MI 3290 11.5.1 Ω - Meter (200 mA) Measurement The resistance measurement is performed in order to assure that the protective measures against electric shock through earth bond connections are effective. The resistance measurement is performed with DC current of 200 mA.

  • Page 97: Ω - Meter (7 Ma) Measurement

    MI 3290 Earth Analyser Tests and Measurements Ω - Meter (200 mA) measurement procedure: Select the Ω - Meter (200 mA) measurement function.  Set the test parameter (limit).  Connect the test leads to the instrument.  Compensate the leads (optional).
  • Page 98 MI 3290 Earth Analyser Tests and Measurements Test parameters for Ω - Meter (7 mA): Sound [On, Off] Limit value selection: [OFF, 1 Ω – 15.0 kΩ] Limit (R) Ω - Meter (7 mA) measurement procedure: Select the Ω - Meter (7 mA) measurement function.

  • Page 99: Ac Impedance [Z]

    MI 3290 Earth Analyser Tests and Measurements 11.6 AC Impedance [Z] An impedance vector consists of a real part (resistance, R) and an imaginary part (reactance, X) as shown in Figure 11.60. Z = R + jX = [��] φ...
  • Page 100 MI 3290 Earth Analyser Tests and Measurements Test can be started from the Impedance Meter measurement window. Before carrying out a test the following parameters (Test Mode, Test Frequency, Test Voltage and Limit (Z)) can be edited. Figure 11.62: Impedance Meter measurement menu...

  • Page 101: Earth Potential [Us]

    MI 3290 Earth Analyser Tests and Measurements 11.7 Earth Potential [Us] An earthing electrode / grid deployed into ground have a certain resistance, depending on its size, surface (oxides on the metal surface) and the soil resistivity around the electrode. The earthing resistance is not concentrated in one point but is distributed around the electrode.

  • Page 102: Potential Measurement

    MI 3290 Earth Analyser Tests and Measurements 11.7.1 Potential Measurement Local potential differences can be simply measured using 3 – pole wiring and setting up step size (m or ft), test frequency and direction ϕ. MI 3290 Earth Analyser fset...
  • Page 103 MI 3290 Earth Analyser Tests and Measurements Test can be started from the Potential measurement window. Before carrying out a test the following parameters can be edited. Figure 11.70: Potential Figure 11.71: Potential Figure 11.72: Potential measurement menu measurement menu...
  • Page 104 MI 3290 Earth Analyser Tests and Measurements Potential measurement (Straight line) step setting: Figure 11.73: Potential measurement (Straight line) step setting Options (during execution of Potential measurement (Straight Line)) Starts measurement step at selected distance “d”. Increase or decrease parameter “d”.
  • Page 105 MI 3290 Earth Analyser Tests and Measurements Figure 11.76: Example of Potential Figure 11.77: Example of Potential measurement result (X-Y) measurement result (GPS) Notes:  Consider displayed warnings when starting the measurement!  High noise currents and voltages in earth could influence the measurement results. The tester displays the “noise”...

  • Page 106: Step And Touch Voltages Theory

    MI 3290 Earth Analyser Tests and Measurements 11.7.2 Step and Touch Voltages Theory Step Voltage The measurement is performed between two ground points at a distance of 1 m as shown on Figure. The metal plates (S2053) simulates the feet. The voltage between the probes is measured by a voltmeter (MI 3295M) with an internal resistance of 1 kΩ...
  • Page 107 Save results (optional).  Notes:  Consider displayed warnings when starting the measurement!  MI 3290 is only a current source! For the voltage measurement Um and for the step, touch calculation the user must use the MI 3295M instrument.

  • Page 108: Pylon Ground Wire Test

    MI 3290 Earth Analyser Tests and Measurements 11.8 Pylon Ground Wire Test (PGWT) 11.8.1 PGWT Measurement The PGWT measurement is performed to check the overhead grounding wire connection. MI 3290 Earth Analyser Igen fset Ig_w Ig_w overhead grounding wire tower 1...
  • Page 109 MI 3290 Earth Analyser Tests and Measurements Test can be started from the Pylon Ground Wire Test window. Before carrying out a test the Following parameters (Test Mode, Frequency and Number of turns F1 – F4) can be edited. Figure 11.84: Pylon Ground Wire Test menu...

  • Page 110: Current [I]

    45 Hz – 1,5 kHz RMS 49,9 A (1 turn) Table 11.87: Available Current RMS measurements in the MI 3290 Iron Clamp Meter RMS This function is intended for measurement of AC currents (leakage currents, loads currents, noise currents) using iron current clamp.

  • Page 111: Iron Clamp Meter Rms Measurement

    MI 3290 Earth Analyser Tests and Measurements 11.9.1 Iron Clamp Meter RMS Measurement Test can be started from the Iron Clamp Meter RMS measurement window. Before carrying out a test the following parameters (Measurement Clamp Type and Limit (Ic)) can be edited.

  • Page 112: Flex Clamp Meter Rms Measurement

    MI 3290 Earth Analyser Tests and Measurements 11.9.2 Flex Clamp Meter RMS Measurement Test can be started from the Flex Clamp Meter RMS measurement window. Before carrying out a test the following parameters (Number of turns F1 - F4) can be edited.

  • Page 113: Voltage [V]

    Voltage Meter RMS cont. 40 Hz – 4,5 kHz RMS 55 V Table 11.94: Available Voltage RMS measurements in the MI 3290 Voltage Meter RMS This function is intended for measurement of voltage noise using H, S, ES to E connection terminals.

  • Page 114: Checkbox

    55 Hz 1,5 kHz 20/40 V If1, If2, If3, If4 Table 11.97: Available Checkbox measurements in the MI 3290 Note:  The Checkbox feature should be used to ensure that the meter is reading correctly between calibrations but should not be regarded as a substitute for a full manufacturer’s calibration on the unit.

  • Page 115: Check V - Meter Measurement

    MI 3290 Earth Analyser Tests and Measurements 11.11.1 Check V - Meter Measurement Test can be started from the Check V-Meter measurement window. Before carrying out a test the following parameters (Test Voltage and Test Frequency) can be edited. Output terminals H, S, ES and E must be opened.

  • Page 116: Check A - Meter Measurement

    MI 3290 Earth Analyser Tests and Measurements 11.11.2 Check A - Meter Measurement Test can be started from the Check A-Meter measurement window. Before carrying out a test the following parameters (Test Voltage and Test Frequency) can be edited. Output terminals H and E must be shorted using reference A-meter.

  • Page 117: Check Iron, Flex Clamps Measurement

    MI 3290 Earth Analyser Tests and Measurements 11.11.3 Check Iron, Flex Clamps Measurement Test can be started from the Check Iron, Flex Clamps measurement window. Before carrying out a test the following parameters (Measurement Clamp Type, Test Voltage, Test Frequency and Number of turns F1 –...

  • Page 118: Auto Sequences

    Auto Sequence® can be stored in the memory together with all related information. Auto Sequence® can be pre-programmed on PC with the Metrel ES Manager software and uploaded to the instrument. On the instrument parameters and limits of individual single test in the Auto Sequence can be changed / set.

  • Page 119: Organization Of Auto Sequence

    MI 3290 Earth Analyser Auto Sequences® 12.2 Organization of Auto Sequence® An Auto Sequence® is divided into three phases: Before starting the first test, the Auto Sequence® view menu is shown (unless it was  started directly from the Main Auto Sequence® menu). Parameters and limits of individual measurements can be set in this menu.
  • Page 120 MI 3290 Earth Analyser Auto Sequences® Auto Sequence® view menu (measurement is selected) Parameters and limits of Name of Auto Sequence selected single test Header Options Single Test Figure 12.3: Auto Sequence® view menu – measurement selected Options Selects single test.

  • Page 121: Step By Step Executions Of Auto Sequence

    MI 3290 Earth Analyser Auto Sequences® 12.2.2 Step by step executions of Auto Sequence® While the Auto Sequence® is running, it is controlled by pre-programmed flow commands. Examples of actions controlled by flow commands are: pauses during the test sequence ...

  • Page 122: Auto Sequence® Result Screen

    MI 3290 Earth Analyser Auto Sequences® 12.2.3 Auto Sequence® result screen After the Auto Sequence® is finished the Auto Sequence® result screen is displayed. At the left side of the display, the single tests and their statuses in the Auto Sequence® are shown. In the middle of the display the header of the Auto Sequence®...
  • Page 123 MI 3290 Earth Analyser Auto Sequences® Options in menu for viewing details of Auto Sequence® results Details of selected single test in Auto Sequence® are displayed. Opens menu for viewing parameters and limits of selected measurements. Refer to chapter 10.1.2 Setting parameters and limits of single tests for more information.

  • Page 124: Auto Sequence Memory Screen

    MI 3290 Earth Analyser Auto Sequences® 12.2.4 Auto sequence memory screen In Auto Sequence® memory screen details of the saved Auto Sequence® can be viewed and a new Auto Sequence® can be restarted. Figure 12.9: Auto Sequence® memory screen Options Retest the Auto Sequence®.

  • Page 125: Communication

    Tree structure and Auto Sequences® from Metrel ES Manager PC software can be  uploaded to the instrument. Metrel ES Manager is PC software running on Windows 7, Windows 8, Windows 8.1 and Windows 10. There are two communication interfaces available on the instrument: USB and Bluetooth.

  • Page 126: Maintenance

    The firmware upgrade requires internet access and can be carried out from the Metrel ES Manager software with a help of special upgrading software – FlashMe that will guide you through the upgrading procedure.

  • Page 127: Technical Specifications

    MI 3290 Earth Analyser Technical specifications 15 Technical specifications 15.1 Earth [Ze] 15.1.1 2, 3, 4 - pole Measurement principle ......... Voltage / Current measurement Earth Test frequency Measuring range Resolution Uncertainty (* See notes) 0,010  … 1,999 ...

  • Page 128: Selective (Iron Clamp)

    MI 3290 Earth Analyser Technical specifications 15.1.2 Selective (Iron Clamp) Measurement principle: ....... Voltage / Current (external Iron Clamp) measurement Selective Earth Test frequency Measuring range Resolution Uncertainty (* See notes) Impedance 0,010  … 1,999  0,001  2,00  … 19,99 ...

  • Page 129: Clamps

    MI 3290 Earth Analyser Technical specifications 15.1.3 2 Clamps Measurement principle: ....... Measurement of resistance in closed loops using two iron current clamps Loop Impedance Measuring range Resolution Uncertainty 0,00  … 9,99  0,01  (5 % of reading + 2 digits) 10,0 ...

  • Page 130: Hf Earth Resistance (25 Khz)

    MI 3290 Earth Analyser Technical specifications 15.1.5 HF Earth Resistance (25 kHz) Measurement principle ......... Current / Voltage measurement Earth Resistance Measuring range Resolution Uncertainty 0,0  … 19,9  0,1  (3 % of reading + 2 digits) 20  … 299 ...

  • Page 131: Selective (Flex Clamps 1 - 4)

    MI 3290 Earth Analyser Technical specifications 15.1.6 Selective (Flex Clamps 1 - 4) Measurement principle: ....... Voltage / Current (external Flex Clamp) measurement Total Earth Test frequency Measuring range Resolution Uncertainty (* See notes) Impedance 0,010  … 1,999 ...

  • Page 132: Specific Earth Resistance Measurements [Ρ]

    MI 3290 Earth Analyser Technical specifications 15.2 Specific Earth Resistance Measurements [ρ] 15.2.1 Wenner and Schlumberger method Measurement principle ......... Voltage / Current measurement Specific Earth Measuring range Resolution Uncertainty 0,00 m … 19,99 m 0,01 m 20,0 m … 199,9 m 0,1 m...

  • Page 133: Earth Potential [Us]

    = �� ∗ (�� /�� �� �� ���������� ������ 15.3.2 S&T Current Source Measurement principle ......... Current (MI 3290) / Voltage measurement (MI 3295M) MI 3290 (current source) Current Measuring range Resolution Uncertainty 0,0 mA … 99,9 mA 0,1 mA (2 % of reading + 2 digits)

  • Page 134: Impulse Impedance [Zp]

    Max noise interference voltage on terminals H, S and E ....1 V rms spark gap Output terminals Figure 15.1: Simplified circuit of impulse generator in the MI 3290 where: G ..............High voltage source R1 ..............Charging resistor C ..............Energy storage capacitor R2, R4 .............

  • Page 135: Dc Resistance [R]

    MI 3290 Earth Analyser Technical specifications 15.5 DC Resistance [R] 15.5.1 Ω - Meter (200mA) Measurement principle: ....... Voltage (dc) / Current (dc) measurement DC Resistance Measuring range Resolution Uncertainty (* See note) 0,00  … 19,99  0,01 ...

  • Page 136: Ω - Meter (7Ma)

    MI 3290 Earth Analyser Technical specifications 15.5.2 Ω - Meter (7mA) Measurement principle: ....... Voltage (dc) / Current (dc) measurement DC Resistance Measuring range Resolution Uncertainty (* See note) 0,0  … 199,9  0,1  200  … 999 ...

  • Page 137: Ac Impedance [Z]

    MI 3290 Earth Analyser Technical specifications 15.6 AC Impedance [Z] 15.6.1 Impedance Meter Measurement principle: ....... Voltage (ac) / Current (ac) measurement AC Impedance Test frequency Measuring range Resolution Uncertainty 0,00  … 19,99  0,01  20,0  … 199,9 ...

  • Page 138: Flex Clamps Meter Rms

    MI 3290 Earth Analyser Technical specifications 15.7.2 Flex Clamps Meter RMS Measurement principle: ....... Current measurement (RMS) Current RMS Measuring range Resolution Uncertainty (* See note) 10 mA … 99,9 mA 0,1 mA 100 mA … 999 mA 1 mA (8 % of reading + 3 digits)

  • Page 139: Voltage [V]

    MI 3290 Earth Analyser Technical specifications 15.8 Voltage [V] 15.8.1 Voltage Meter RMS Measurement principle: ....... Voltage (RMS) / frequency measurement Voltage RMS Measuring range Resolution Uncertainty (* See note) 0,00 V … 9,99 V 10 mV (1 % of reading + 3 digits) Uh, Us, Ues 10,00 V …...

  • Page 140: Influence Of The Auxiliary Electrodes

    MI 3290 Earth Analyser Technical specifications 15.9 Influence of the auxiliary electrodes Definition of Rc, Rp and Ra: Rc ............. Impedance of auxiliary current probes (Rh + Re) Rp ............. Impedance of auxiliary potential probes (Rs + Res) Ra ............. Earth resistance Measurement function ........

  • Page 141: Influence Of Low Test Current Through Clamps

    MI 3290 Earth Analyser Technical specifications 15.10 Influence of low test current through clamps In large systems the measured partial current is only a small portion of the test current through the current clamp. The measuring uncertainty for small currents of and immunity against noise currents must be considered.

  • Page 142: Influence Of Noise

    MI 3290 Earth Analyser Technical specifications 15.11 Influence of noise Definition of noise: Injection of series interference (voltage / current) with system frequencies of: 16 2/3 Hz, 50 Hz, 60 Hz, 400 Hz or d.c. (frequencies by IEC 61557-5). Measurement function ........2, 3, 4 – pole, Selective (Iron, Flex Clamp),...

  • Page 143: Digital Filtering Technique

    MI 3290 Earth Analyser Technical specifications 15.11.1 Digital filtering technique The Earth Analyser uses a high - resolution 52k SPS (samples per second) analog to digital converter to obtain all the different analog signals like input voltage (Uh), current (ie)… to digital results.

  • Page 144: General Data

    MI 3290 Earth Analyser Technical specifications 15.13 General data Battery power supply ........14,4 V DC (4,4 Ah Li-ion) Battery charging time ........typical 4,5 h (deep discharge) Mains power supply ........90-260 V , 45-65 Hz, 100 VA Over-voltage category ........300 V CAT II Battery operation time: Idle state ............

  • Page 145: Appendix A - Structure Objects

    Appendix A – Structure objects MI 3290 Earth Analyser Appendix A – Structure objects Structure elements used in Memory Organizer are instrument’s Profile dependent. Figure A.1: Memory organizer hierarchy Symbol Default name Parameters: Node name of project, description of project;...

  • Page 146: Appendix B - Profiles Selection Table

    Appendix B – Profiles Selection Table MI 3290 Earth Analyser Appendix B – Profiles Selection Table Available profiles and measurement functions for the Earth Analyser: Profile Measurement functions available ARAB ARAA ARAC ARAD Code Name MI 3290 GF MI 3290 GL...

  • Page 147: Appendix C - Functionality And Placing Of Test Probes

    Appendix C –Functionality and placing of test probes MI 3290 Earth Analyser Appendix C – Functionality and placing of test probes For a standard earthing resistance two test probes (voltage and current) are used. Because of the voltage funnel it is important that the test electrodes are placed correctly. More information about principles described in this document can be found in the handbook: Grounding, bonding, and shielding for electronic equipment and facilities.
  • Page 148 Appendix C –Functionality and placing of test probes MI 3290 Earth Analyser Figure C.2: Definition of parameter a Straight-line placement Figure C.3:Straight-line placement After the maximum dimension a of an earthing system is defined then measurements can be performed by proper placement of test probes. A measurement with three placements of test probe S (S’’, S, S’) is intended to verify that the selected distance d1 is long enough.
  • Page 149 Appendix C –Functionality and placing of test probes MI 3290 Earth Analyser Measurement 2 Distance from earthing electrode E/ES to voltage probe S shall be:        Measurement 3 Distance from earthing electrode E/ES to voltage probe S shall be: ...
  • Page 150  METREL test equipment displays appropriate warnings in this case, according to IEC 61557-5. All METREL Earth testers measure accurate at probe resistances far beyond the limits in IEC 61557-5. Figure C.6: Different measured voltage drops at low and high probe resistance...

  • Page 151: Appendix D - Pulse And 3-Pole Example

    Appendix D –Pulse and 3-pole example MI 3290 Earth Analyser Appendix D – Pulse and 3-pole example Test objects description and schematics wiring diagram: Test Object Ro 1  50  200  1 µH 1  50  200 ...

  • Page 152: Appendix E - Programming Of Auto Sequences® On Metrel Es Manager

    Appendix E – Programming of Auto Sequences® on Metrel ES Manager The Auto Sequence® Editor is a part of the Metrel ES Manager software. In Auto Sequence® Editor an Auto Sequence® can be pre-programmed and organized in groups, before uploaded to the instrument.
  • Page 153 MI 3290 Earth Analyser Appendix F - The balancing procedure Figure E.2: Example Auto Sequence® header Figure E.3: Example of a measurement step Figure E.4: Example Auto Sequence® result part Managing groups of Auto Sequences® The Auto Sequences® can be divided into different user defined groups of Auto Sequences®.
  • Page 154 MI 3290 Earth Analyser Appendix F - The balancing procedure Saves / Saves as the opened Group of Auto Sequences® to a file. Creates a new file (Group of Auto Sequences®). Closes the file (Group of Auto Sequences®). Group of Auto Sequence® view options: Expand all folders / subfolders / Auto Sequences®.
  • Page 155 MI 3290 Earth Analyser Appendix F - The balancing procedure Auto Sequence® name: Edit Auto Sequence® name DOUBLE CLICK Folder name: Edit folder name Drag and drop of the selected Auto Sequence® or Folder / Subfolder moves it to a new location: “Drag and drop”...
  • Page 156 The Result step contains the Result screen flow command by default. Other Flow commands can also be added to the Result step. Single tests Single tests are the same as in Metrel ES Manager Measurement menu. Limits and parameters of the measurements can be set. Results and sub-results can’t be set. Flow commands Flow commands are used to control the flow of measurements.
  • Page 157 MI 3290 Earth Analyser Appendix F - The balancing procedure Options: Adding a measurement step By double clicking on a Single test a new measurement step will appear as the last of measurement steps. It can also be dragged and dropped on the appropriate position in the Auto Sequence®.
  • Page 158 MI 3290 Earth Analyser Appendix F - The balancing procedure Show picture browse for image path Duration Number in seconds, infinite no entry Buzzer mode Passed or failed measurement is indicated with beeps. Pass – double beep after the test ...

  • Page 159: Appendix F - The Balancing Procedure

    In such case, the local earthing current I has to be measured separately with the method as f_sum described in IEEE 81-2012 Ch. 8.2.2.6 and implemented in MI 3290 Earth Analyser (measurements with multiple flex clamps). The following relations are valid: ��...
  • Page 160 Distance (R) value for the distance between E and H has to be entered. These balanced positions are calculated by MI 3290 if the balancing procedure is started by selecting the button in the control panel of the Selective (Flex clamps 1-4) measurement: Balancing procedure is enabled only if single Test Mode is selected.
  • Page 161 MI 3290 Earth Analyser Appendix F - The balancing procedure Balancing procedure will return: = 32 m and r = 139 m The user has to decide on which position he will put the S probe. Usually the S position is used but if this position is already within the irregular area (to close to tested object), then the S position can be used but this requires longer cables.
  • Page 162 MI 3290 Earth Analyser Appendix F - The balancing procedure Balancing procedure ends with two results and r Select one with commit with the selected result. Results must be in the range of 1 – 1000 to be valid. The selected result is automatically saved ...

Table of Contents