METREL MI 3288 Instruction Manual
  1. Manuals
  2. Brands
  3. METREL Manuals
  4. Test Equipment
  5. MI 3288
  6. Instruction manual

METREL MI 3288 Instruction Manual

Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
EI Tester
MI 3288
Instruction manual
Version 1.2.2, Code No. 20 753 190

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the MI 3288 and is the answer not in the manual?

Questions and answers

Related Manuals for METREL MI 3288

Summary of Contents for METREL MI 3288

  • Page 1 EI Tester MI 3288 Instruction manual Version 1.2.2, Code No. 20 753 190...
  • 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 Metrel reserve the right to make technical modifications without notice as part of the further development of the product. ➢ MI 3288 instrument 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 4: Table Of Contents

    MI 3288 EI Tester 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 3288 EI Tester Table of contents 8.9.2 Workspace Manager main menu ............. 37 8.9.3 Operations with Workspaces ..............38 8.9.4 Operations with Exports ................38 8.9.5 Adding a new Workspace ................. 39 8.9.6 Opening a Workspace ................40 8.9.7 Deleting a Workspace / Export ..............
  • Page 6 MI 3288 EI Tester Table of contents 11.7 Insulation Resistance Measurement [Riso] ............. 99 11.7.1 Insulation Resistance measurement ............100 11.7.2 Diagnostic Test ..................101 11.7.3 Varistor Test ................... 105 11.8 Current [I] ...................... 106 11.8.1 Current Clamp Meter ................107 12 Auto Sequences®...
  • Page 7 – Profiles Selection Table ..............140 Appendix B – Functionality and placing of test probes ........141 Appendix C – Programming of Auto Sequences® on Metrel ES Manager ..145 Appendix D Auto Sequence® Editor workspace ............... 145 Managing groups of Auto Sequences® ............146 Auto Sequences®...

  • Page 8: General Description

    1 General description 1.1 Features EI (Earth – Insulation) Tester (MI 3288) is a Multi-function, portable battery (Li-ion) test instrument with excellent IP protection IP54, intended for: Voltage and frequency measurement (TRMS), Insulation resistance measurement up to 2,5 kV, Earth resistance and impedance, Specific earth resistance, Earth potential and continuity (7 mA, 200 mA) measurement.

  • 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 MI 3288 instruments in good condition and undamaged. When using the instrument, consider the following general warnings: ▪...
  • Page 10 MI 3288 EI Tester Safety and operational considerations This equipment should be recycled as electronic waste. 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 3288 EI Tester 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 3288 EI Tester 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 3288 EI Tester Safety and operational considerations Typical charging time is 3 hours (Battery type: 18650T22A2S2P) 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: ........

  • Page 14: Li - Ion Battery Pack Guidelines

    MI 3288 EI Tester 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 3288 EI Tester Safety and operational considerations 2.3 Standards applied The MI 3288 instrument is manufactured and tested in accordance with the following regulations: Electromagnetic compatibility (EMC) EN 61326 - 1 Electrical equipment for measurement, control and laboratory use – EMC requirements – Part 1: General requirements...

  • Page 16: Terms And Definitions

    MI 3288 EI Tester Terms and definitions 3 Terms and definitions For the purposes of this document and instrument MI 3288, the following definitions apply. Index: Unit: Description: [Ω] Earth resistance of complete system. [Ω] Earth impedance of complete system.

  • Page 17: Instrument Description

    MI 3288 EI Tester Instrument description 4 Instrument description 4.1 Operator’s panel The operator’s panel is shown in Figure 4.1 below. Figure 4.1: The operator’s panel Colour TFT display with touch screen SAVE Stores actual measurement result(s) CURSOR Navigate in menus Start / stop selected measurement.

  • Page 18: Connector Panel

    MI 3288 EI Tester Instrument description 4.2 Connector panel Figure 4.2: Connector panel Test connector Protection cover Protection cover – PS/2 communication port Charger socket USB communication port Communication with PC USB port PS/2 communication port Communication with PC RS232 serial port...

  • Page 19: Back Side

    MI 3288 EI Tester Instrument description 4-wire test accessory (Earth measurements, Step and Touch voltage): E (blue) terminal for the earth electrode ❑ terminal for the probe placed nearest to the earth electrode ES (red) ❑ potential terminal (A 1597 and metal plates)
  • Page 20 MI 3288 EI Tester Instrument description Figure 4.4: Battery and fuse compartment Type: 4400 mAh (18650T22A2S2P) 1 Li-ion battery pack Type: 8800 mAh (18650T22A2S4P) 2 Fuse F2 FF 2 A / 1000 V (breaking capacity 50 kA) 3 SD card slot Figure 4.5: Bottom view...

  • Page 21: Secure Attachment Of The Strap

    MI 3288 EI Tester Instrument description 4.3.1 Secure attachment of the strap You can choose between two methods: Figure 4.6: First method Figure 4.7: Alternative method Please perform periodical check attachment.

  • Page 22: Accessories

    See attached list for standard configuration and options or contact your distributor or see the METREL home page: http://www.metrel.si. MI 3288 tester 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 accessories and license keys.

  • Page 23: Instrument Operation

    MI 3288 EI Tester Instrument operation 6 Instrument operation The MI 3288 instrument can be manipulated via a keypad or touch screen. 6.1 General meaning of keys Cursor keys are used to: select appropriate option. ❑ Run key is used to: confirm selected option;...

  • Page 24: Virtual Keyboard

    MI 3288 EI Tester Instrument operation Long press (touch surface with fingertip for at least 1 s) is used to: select additional keys (virtual keyboard); ❑ long select test or measurement using cross selector. ❑ Tap Escape icon is used to: return to previous menu without changes;...

  • Page 25: Display And Sound

    MI 3288 EI Tester 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 26 MI 3288 EI Tester Instrument operation Opens help screen. Views results of measurement. Starts test leads compensation in Ω - Meter (200 mA and 7 mA) measurement. Search in Memory Organizer / Auto Sequences® menu. Pass ticker in Visual test.

  • Page 27: Sound Indication

    MI 3288 EI Tester Instrument operation Test leads resistance in Ω - Meter (200 mA and 7 mA) measurement is compensated. Fuse F2 is broken. Low test current through Iron or Flex clamps. Results may be impaired. See chapter 15.9 Influence of low test current through clamps.

  • Page 28: Bluetooth

    MI 3288 EI Tester Instrument operation HV+ - HV- ............0 V … >2999 kV 6.4.5 Bluetooth Bluetooth communication inactive. Bluetooth communication active. 6.4.6 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.

  • Page 29: Main Menu

    MI 3288 EI Tester 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 30: General Settings

    MI 3288 EI Tester 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 Instrument language selection. Refer to chapter 8.1 Language for more information.

  • Page 31: Language

    MI 3288 EI Tester 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 32: Date And Time

    MI 3288 EI Tester 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 33: Settings

    MI 3288 EI Tester 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 Description...

  • Page 34: Initial Settings

    MI 3288 EI Tester 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 35: Auto Sequence® Groups

    General Settings 8.8 Auto Sequence® groups The Auto Sequences® in MI 3288 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® that are stored on the microSD card.

  • Page 36: Selecting A List Of Auto Sequences

    MI 3288 EI Tester 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 ...

  • Page 37: Workspace Manager

    8.9.1 Workspaces and Exports The works with MI 3288 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 38: Operations With Workspaces

    MI 3288 EI Tester General Settings Displays a list of Workspaces. 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.

  • Page 39: Adding A New Workspace

    MI 3288 EI Tester General Settings Imports a new Workspace from Export. Refer to 8.9.8 Importing a Workspace for more information. 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.

  • Page 40: Opening A Workspace

    MI 3288 EI Tester 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 41: Importing A Workspace

    MI 3288 EI Tester 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 42 MI 3288 EI Tester 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...

  • Page 43: User Accounts

    MI 3288 EI Tester 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 44: Changing User Password, Signing Out

    MI 3288 EI Tester 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 45: Managing Accounts

    MI 3288 EI Tester General Settings The user can change its password. The actual password must be entered first followed by the new password. Enters the Account manager menu. 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.
  • Page 46 MI 3288 EI Tester 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 47: Setting Black-Box Password

    MI 3288 EI Tester General Settings 8.10.4 Setting Black-box password Black-box password can be set by administrator from the Account manager menu. Set Black- box password is valid for all users. Default Black-box password is empty (disabled). Options Add or edit Black-box password. Enter to modify.

  • Page 48: Memory Organizer

    MI 3288 EI Tester Memory organizer 9 Memory Organizer Memory Organizer is a tool for storing and working with test data. 9.1 Memory Organizer menu EI Tester instrument has a multi-level structure. The hierarchy of Memory organizer in the tree is shown on Figure 9.1.

  • Page 49: Structure Items

    MI 3288 EI Tester 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 50: Operations In Tree Menu

    MI 3288 EI Tester Memory organizer 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 51 MI 3288 EI Tester 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.
  • Page 52 MI 3288 EI Tester Memory organizer Cut & Paste a Structure. Selected Structure with child items (sub-structures and measurements) can be moved to any allowed location in structure tree. Refer to chapter 9.1.4.10 Cut & Paste a Structure item with sub-items for more information.
  • Page 53 MI 3288 EI Tester Memory organizer  Select Comments in Control panel. 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 54 MI 3288 EI Tester Memory organizer A list of available structure items is displayed. Select one from a list. Arrow indicates the position where structure item will be inserted.  Child item to the currently selected structure item. Structure item located in the same level.
  • Page 55 MI 3288 EI Tester 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 56 MI 3288 EI Tester 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 items have same name as original.
  • Page 57 MI 3288 EI Tester 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 58 MI 3288 EI Tester 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 selected structure item for more information.
  • Page 59 MI 3288 EI Tester Memory organizer 9.1.4.10 Cut & Paste a Structure item with sub-items In this menu selected Structure item with sub-items (sub-structures and measurements) can be cut and pasted (moved) to any allowed location in the structure tree.
  • Page 60 MI 3288 EI Tester Memory organizer  Select Copy in Control panel. Select the location where measurement  should be pasted.  Select Paste in Control panel. A new (empty) measurement is displayed in selected Structure item.  Note: The Paste command can be executed ❑...
  • Page 61 MI 3288 EI Tester Memory organizer  Structure without deleted structure item. 9.1.4.13 Delete a measurement In this menu selected measurement can be deleted. Procedure  Select a measurement to be deleted.  Select Delete in Control panel.  A confirmation window will appear.
  • Page 62 MI 3288 EI Tester Memory organizer 9.1.4.14 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.
  • Page 63 MI 3288 EI Tester Memory organizer Measurement retest starting screen is  displayed. Parameters and limits can be viewed and  edited. Select Run in Control panel to retest the  measurement. Results / sub-results after re-run of  recalled measurement.

  • Page 64: Single Tests

    MI 3288 EI Tester 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 three modes for selecting single tests are available.

  • Page 65: Single Test Screens

    MI 3288 EI Tester Single tests Last 9 made different single tests are displayed. 10.1.1 Single test screens In the Single test screens measuring results, sub-results, limits and parameters of the measurement are displayed. In addition, on-line statuses, warnings and other info are displayed.

  • Page 66: Setting Parameters And Limits Of Single Tests

    MI 3288 EI Tester Single tests 10.1.2 Setting parameters and limits of single tests Procedure Select the test or measurement. The test can be entered from: Single tests menu or ❑  Memory organizer menu once the ❑ empty measurement was created under selected structure.

  • Page 67: Single Test Result Screen

    MI 3288 EI Tester Single tests 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. Saves the result.

  • Page 68: Recall Single Test Result Screen

    MI 3288 EI Tester Single tests long on Enters cross selector to select test or measurement. 10.1.4 Recall single test result screen Figure 10.3: Recalled results of selected measurement, example of 4 -pole measurement recalled results Options Retest Enters starting screen for a new measurement.

  • Page 69: Single Test (Visual Test) Start Screen

    MI 3288 EI Tester Single tests Selected Visual Test Overall status Item Options Child item Status fields Figure 10.4: Visual Test screen organisation 10.1.6 Single test (Visual Test) start screen Figure 10.5: Visual Test screen organisation Options (before Visual Test screen was opened in Memory organizer or from Single test main...

  • Page 70: Single Test (Visual Test) Screen During Test

    MI 3288 EI Tester Single tests 10.1.7 Single test (Visual Test) screen during test Figure 10.6: 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 71: Single Test (Visual Test) Result Screen

    MI 3288 EI Tester Single tests Goes to the result screen. 10.1.8 Single test (Visual Test) result screen Figure 10.7: 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 72: Single Test (Visual Test) Memory Screen

    MI 3288 EI Tester Single tests 10.1.9 Single test (Visual Test) memory screen Figure 10.8: Visual Test memory screen Options Retest Enters starting screen and starts the new Visual test. Set cursor for viewing data on multiple pages.

  • Page 73: Tests And Measurements

    MI 3288 EI Tester Tests and Measurements 11 Tests and Measurements 11.1 Visual tests Visual tests 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 74 MI 3288 EI Tester Tests and Measurements After Test Reminder No. Description Values All test leads promptly removed after the test is completed. Pass/Fail/Clear/Checked Table 11.3: Visual Test – After Test Reminder Safety Precautions (IEEE 81tm /5) No. Description Values Ground electrode tests precautions.

  • Page 75: Voltage And Frequency Measurements [U/F]

    MI 3288 EI Tester Tests and Measurements 11.2 Voltage and Frequency Measurements [U/f] Voltage measurement is common function, for example, when locating installation faults or, as a safety measure, before starting any installation adaptation activity. 11.2.1 Voltage Meter It is a simple function that continuously measures the DC and AC voltage and frequency across HV+ and HV- terminals.
  • Page 76 MI 3288 EI Tester Tests and Measurements Figure 11.5: Example of Voltage Meter measurement result Warning! ❑ Do not connect test terminals to external voltage higher than 1000 V a.c. or d.c., in order not to damage the test instrument! Note: ❑...

  • Page 77: Earth Measurements [Ze And Re]

    Main installation earthing arrangements, lightning systems, local earthings, soil resistivity, etc. can be verified with the EI Tester. The MI 3288 is able to carry out Earth measurements using different methods. The appropriate one should be selected by the operator, depending on the particular earthing system to be tested.
  • Page 78 MI 3288 EI Tester Tests and Measurements �� [��] ��−�� �� = [��] �� >> �� where �� �� �� �� [��] �� ........Earth impedance ........Earth resistance (excluding reactance) ........Impedance of auxiliary current probe (H) ........Injected test current ........

  • Page 79: Pole Measurement

    MI 3288 EI Tester Tests and Measurements ❑ 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 related to probes: ❑...
  • Page 80 MI 3288 EI Tester 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 11.10: 3 - pole measurement menu Test parameters for 3 –...

  • Page 81: Pole Measurement

    MI 3288 EI Tester Tests and Measurements 11.3.3 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 3288...

  • Page 82: Selective (Iron Clamp) Measurement

    MI 3288 EI Tester Tests and Measurements Figure 11.13: 4 - pole measurement menu Test parameters for 4 – pole: Test Mode Test mode: [single] Test Set test frequency: [55 Hz, 82 Hz, 94 Hz, 105 Hz, 111 Hz, 128 Hz, 164 Hz]...
  • Page 83 MI 3288 EI Tester Tests and Measurements MI 3288 fset H - auxiliary current probe S - probe E a r t h Figure 11.15: Selective (Iron Clamp) example During the measurement a sinusoidal current I is injected into the earth through an auxiliary current probe (H).

  • Page 84: Clamps Measurement

    MI 3288 EI Tester Tests and Measurements Figure 11.16: Selective (Iron Clamp) measurement menu Test parameters for Selective (Iron Clamp): Test Mode Test mode: [single] Test Set test frequency: [55 Hz, 82 Hz, 94 Hz, 105 Hz, 111 Hz, 128 Hz, 164 Hz]...
  • Page 85 MI 3288 EI Tester Tests and Measurements MI 3288 fset E a r t h Figure 11.18: 2 Clamps example The driver (generator) clamp injects a voltage in the earthing system. The injected voltage generates a test current in the loop. If the total loop earth impedance of the electrodes Z...
  • Page 86 MI 3288 EI Tester Tests and Measurements Test parameters for 2 Clamps: Measurement Clamp type Measurement clamp type: [A1281] Test Frequency Set test frequency: [82 Hz, 94 Hz, 105 Hz, 111 Hz, 128 Hz, 164 Hz] Generator Clamp type Generator clamp type: [A1019] Limit value selection [OFF, Custom, 0.1 Ω...

  • Page 87: Specific Earth Resistance Measurements[Ρ]

    / ft 20 / 40 V Table 11.6: Available Specific Earth Resistance measurements in the MI 3288 11.4.1 General on specific earth What is Specific Earth Resistance? It is the resistance of ground material shaped as a cube 1 × 1 × 1 m, where the measurement electrodes are placed at the opposite sides of the cube, see the figure below.

  • Page 88: 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 4-wire Earth test cable to the MI 3288 and terminals H, S, ES, and E using the probe wires to the probes. MI 3288...
  • Page 89 MI 3288 EI Tester Tests and Measurements Test parameters for Wenner method: Test Voltage Set test voltage: [20 V or 40 V] Length Unit Set the length unit: [m or ft] Set the distance between earth probes: [0.1 m – 49.9 m] or [1 ft – 200 ft] Distance a Limit (ρ)

  • Page 90: Schlumberger Method Measurement

    << a,d. Distance d must be between 0.1 m and 24.9 m and the distance a must be a>2*d. Connect the 4-wire Earth test cable to the MI 3288 and terminals H, S, ES, and E using the probe wires to the probes. MI 3288...
  • Page 91 MI 3288 EI Tester Tests and Measurements Test can be started from the Schlumberger method measurement window. Before carrying out a test the following parameters (Test Voltage, Unit, Distance a, Distance d and Limit (ρ)) can be edited. Figure 11.26: Schlumberger method measurement menu...

  • Page 92: Earth Potential [Us]

    MI 3288 EI Tester Tests and Measurements 11.5 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 93: Step And Touch Measurement

    MI 3288 EI Tester Tests and Measurements 11.5.1 Step and Touch Measurement Step Voltage The measurement is performed between two ground points at a distance of 1 m as shown on Figure. The metal plates (S2053) simulate the feet. The voltage between the probes is measured by a voltmeter with an external resistance of 1 kΩ...
  • Page 94 MI 3288 EI Tester Tests and Measurements During the measurement a sinusoidal current Igen is injected into the earth through an auxiliary probe (H). The resistance of the auxiliary probe (H) should be as low as possible in order to inject a high test current.

  • Page 95: Dc Resistance [R]

    ��[����������] Note about thermal EMF: ❑ A junction between two different metals produces a voltage related to a temperature difference (thermocouple). MI 3288 eliminates the thermal EMF effect by measuring resistance in both directions of current flow +I and -I.

  • Page 96: Ω - Meter (200 Ma) Measurement

    MI 3288 EI Tester Tests and Measurements 11.6.1 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 3288 EI Tester Tests and Measurements Wait until the test result is displayed on the screen. ❑ Save results (optional). ❑ Note: ❑ Consider displayed warnings when starting the measurement! 11.6.2 Ω - Meter (7 mA) Measurement In general, this function serves as standard  - meter with a low testing current. The measurement is performed continuously without polarity reversal.
  • Page 98 MI 3288 EI Tester Tests and Measurements Press the Run key to start the measurement. ❑ Wait until the test result is displayed on the screen. ❑ Press the Run key to stop the measurement. ❑ Save results (optional). ❑...

  • Page 99: Insulation Resistance Measurement [Riso]

    MI 3288 EI Tester Tests and Measurements 11.7 Insulation Resistance Measurement [Riso] The purpose of insulation tests Insulating materials are important parts of almost every electrical product. The material’s properties depend not only on its compound characteristics but also on temperature, pollution, moisture, ageing, electrical and mechanical stress, etc.

  • Page 100: Insulation Resistance Measurement

    MI 3288 EI Tester Tests and Measurements 2-wire MI 3288 Guard Figure 11.42: Insulation resistance example (IR, DD, SV, WS - Test) In the example following insulation resistance is measured: �� [��] ���� Riso = = [��] �� [��] ����...

  • Page 101: Diagnostic Test

    MI 3288 EI Tester Tests and Measurements Figure 11.44: Example of Insulation Resistance measurement result Warnings: ❑ Refer to Warnings chapter for safety precautions! ❑ Do not touch the test object during the measurement or before it is fully discharged!
  • Page 102 MI 3288 EI Tester Tests and Measurements Wait for the object under test to discharge. ❑ Save results (optional). ❑ Figure 11.46: Example of Diagnostic Test result Warnings: ❑ Refer to Warnings chapter for safety precautions! ❑ Do not touch the test object during the measurement or before it is fully discharged! Risk...
  • Page 103 MI 3288 EI Tester Tests and Measurements DAR value Tested material status < 1 Bad insulation 1 ≤ DAR ≤1.25 Acceptable insulation > 1.4 Very good insulation Note: ❑ When determining Riso (30 s) pay close attention to the capacitance of the test objects. It has to be charged-up in the first time section (30 s).
  • Page 104 MI 3288 EI Tester Tests and Measurements C........Capacitance of test object. U........Test voltage. A high re-absorption current shows that the insulation has been contaminated, usually by moisture. Typical values of dielectric discharge are shown in table. DD value Tested material status >...

  • Page 105: Varistor Test

    MI 3288 EI Tester Tests and Measurements 11.7.3 Varistor Test A voltage ramp starts from 50 V and rises with a slope of 80 V/s. The measurement ends when the defined end voltage is reached or if the test current exceeds the set trigger value. Test can be started from the Varistor Test window.

  • Page 106: Current [I]

    1000 A A1609 3000 A Table 11.10: Available Current measurements in the MI 3288 A1281 AC current clamp The A 1281 multi range current clamps are designed for measuring alternating currents on low and medium power installations: (50 mA … 1000 A). Clamps have four current ranges 0.5 A, 5 A, 100 A and 1000 A, which are selected directly on master instrument.

  • Page 107: Current Clamp Meter

    MI 3288 EI Tester Tests and Measurements 11.8.1 Current Clamp Meter Measurement can be started from the Current Clamp Meter window. Before carrying out a measurement the following parameters (Clamp Type and Clamp Range) can be edited. Figure 11.52: Current Clamp Meter menu...

  • Page 108: Auto Sequences

    The results of an 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 109: Searching In Auto Sequences® Menu

    Auto Sequences® MI 3288 EI Tester 12.1.2 Searching in Auto Sequences® menu In Auto Sequence® menu it is possible to search for Auto Sequences® on base of their Name or Short code. Procedure Search function is available from the ...

  • Page 110: Organization Of Auto Sequences® In Auto Sequences® Menu

    Auto Sequences® MI 3288 EI Tester Figure 12.1: Search results screen (left), Auto Sequence selected (right) Options Next page. Previous page. Goes to location in Auto Sequences® menu. Goes to Auto Sequence® view menu. Starts the selected Auto Sequence®. Note: Search result page consist of up to 50 results.
  • Page 111 Auto Sequences® MI 3288 EI Tester Options The original Auto Sequence®. A shortcut to the original Auto Sequence®. Enters menu for more detail view of selected Auto Sequence®. This option should also be used if the parameters / limits of the selected Auto Sequence®...

  • Page 112: Organization Of Auto Sequence

    Auto Sequences® MI 3288 EI Tester 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 113: Step By Step Executions Of Auto Sequence

    Auto Sequences® MI 3288 EI Tester Options Selects single test. Opens menu for changing parameters and limits of selected measurements. Refer to chapter 10.1.2 Setting parameters and limits of single tests for more information how to change measurement parameters and limits.

  • Page 114: Auto Sequence® Result Screen

    Auto Sequences® MI 3288 EI Tester Figure 12.6: Auto Sequence® – example of a finished measurement with options for proceeding Options (during execution of an Auto Sequence®) Proceeds to next step in the test sequence. Repeats the measurement. Displayed result of a single test will not be stored.
  • Page 115 Auto Sequences® MI 3288 EI Tester Figure 12.7: Auto Sequence® result screen Options Start Test Starts a new Auto Sequence®. View results of individual measurements. The instrument goes to menu for viewing details of the Auto Sequence®. Saves the Auto Sequence® results.
  • Page 116 Auto Sequences® MI 3288 EI Tester 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 117: Auto Sequence Memory Screen

    Auto Sequences® MI 3288 EI Tester 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 12.10: Auto Sequence® memory screen Options Retest the Auto Sequence®.

  • Page 118: 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 8, Windows 8.1 and Windows 10. There are three communication interfaces available on the instrument: RS-232, USB and Bluetooth.

  • Page 119: Maintenance

    Maintenance 14 Maintenance Unauthorized persons are not allowed to open the MI 3288 instrument. There are no user replaceable components inside the instrument, except the battery and fuse under back cover. Figure 14.1: Position of screws to open battery / fuse compartment 14.1 Fuse replacement...

  • Page 120: Battery Pack Insertion / Replacement

    MI 3288 EI Tester Maintenance 14.2 Battery pack insertion / replacement Procedure:  Remove the battery pack from battery compartment.  Remove foam if were inserted under the battery pack.  Press to unlock the connector (1) and pull the wires (2) to disconnect the battery pack from the instrument.

  • Page 121: Cleaning

    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 122: Technical Specifications

    MI 3288 EI Tester Technical specifications 15 Technical specifications 15.1 Voltage and frequency [U/f] 15.1.1 Voltage Meter RMS Measurement principle: ....... Voltage measurement (True r.m.s.) Display range Uac.......... 0.000 V … >750 V Voltage Measuring range Resolution Uncertainty Freq. range: 15 Hz … 99 Hz 0.000 V …...

  • Page 123: Current [I]

    MI 3288 EI Tester Technical specifications 15.2 Current [I] 15.2.1 Iron (A 1281) and Flex (A 1227, A 1609) current clamp Measurement principle: ....... Current measurement (RMS) Current Type Range Measuring range Display range Resolution Overall Uncertainty (* See notes) 0.5 A...

  • Page 124: Earth [Ze]

    MI 3288 EI Tester Technical specifications 15.3 Earth [Ze] 15.3.1 2, 3, 4 - pole Measurement principle ........ Voltage / Current measurement Display range Ze ..........(0.000 Ω … >19.99 kΩ) Earth Test frequency Measuring range Resolution Uncertainty (* See notes) 0.010 ...

  • Page 125: Selective (Iron Clamp)

    MI 3288 EI Tester Technical specifications 15.3.2 Selective (Iron Clamp) Measurement principle: ....... Voltage / Current (external Iron Clamp) measurement Display range Zsel ......... (0.000 Ω … >19.99 kΩ) Selective Earth Test frequency Measuring range Resolution Uncertainty (* See notes) Impedance 0.010 ...

  • Page 126: Clamps

    MI 3288 EI Tester Technical specifications 15.3.3 2 Clamps Measurement principle: ....... Measurement of resistance in closed loops using two iron current clamps Display range Ze ..........(0.000 Ω … >100 Ω) Loop Impedance Measuring range Resolution Uncertainty 0.000  … 1.999 ...

  • Page 127: Specific Earth Resistance Measurements [Ρ]

    MI 3288 EI Tester Technical specifications 15.4 Specific Earth Resistance Measurements [ρ] 15.4.1 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 128: Earth Potential [Us]

    MI 3288 EI Tester Technical specifications 15.5 Earth Potential [Us] 15.5.1 Step and Touch Measurement principle: ....... Current /Voltage measurement Step and Touch Measuring range Resolution Uncertainty 0.1 V … 199.9 V 0.1 V calculated value (consider uncertainty 200 V … 999 V...

  • Page 129: Dc Resistance [R]

    MI 3288 EI Tester Technical specifications 15.6 DC Resistance [R] 15.6.1 Ω - Meter (200mA) Measurement principle: ....... Voltage (dc) / Current (dc) measurement Display range R..........0.000  … >1.99 k DC Resistance Measuring range Resolution Uncertainty (* See note) 0.020 ...

  • Page 130: Ω - Meter (7Ma)

    MI 3288 EI Tester Technical specifications 15.6.2 Ω - Meter (7mA) Measurement principle: ....... Voltage (dc) / Current (dc) measurement Display range R..........0.0  … >999 k DC Resistance Measuring range Resolution Uncertainty (* See note) 0.0  … 199.9 ...

  • Page 131: Insulation Resistance Measurement [Riso]

    MI 3288 EI Tester Technical specifications 15.7 Insulation Resistance Measurement [Riso] 15.7.1 Insulation Resistance - (IR, DD, - Test) Measurement principle: ....... Voltage (dc) / Current (dc) measurement Display range Riso ......... 0 k … >100 G* (Un and R dependent) Resistance (Measurement ranges and accuracy for Un = 2.5 kV)
  • Page 132 MI 3288 EI Tester Technical specifications DC Current Display range I ..........0.00nA … 5.0mA DC Current Measuring range Resolution Uncertainty 2.0 mA … 5.0 mA 0.1 mA 10 A 0.20 mA … 1.99 mA (1 % of reading + 3 digits) 20 A …...

  • Page 133: Varistor Test

    MI 3288 EI Tester Technical specifications Figure 15.1: Generator capability vs resistance 15.7.2 Varistor test Measurement principle: ....... Voltage (dc) / Current (dc) measurement; dc voltage ramp. Display range Uac.......... 0.0 V … >1563 V Voltage Measuring range Resolution Uncertainty 0.0 V …...

  • Page 134: Influence Of The Auxiliary Electrodes

    MI 3288 EI Tester Technical specifications 15.8 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 135: Influence Of Noise

    MI 3288 EI Tester Technical specifications 15.10 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),...

  • Page 136: Digital Filtering Technique

    Technical specifications 15.10.1 Digital filtering technique The MI 3288 uses a high - resolution 7k 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 137: General Data

    MI 3288 EI Tester Technical specifications 15.12 General data Battery power supply ........7.2 V DC (4.4 Ah or 8.8 Ah Li-ion pack) Battery charging time ........typical 3 h (4400 mAh Li-ion pack, type: 18650T22A2S2P) typical 4.5 h (8800 mAh Li-ion pack, type: 18650T22A2S4P) Charger socket input voltage ......
  • Page 138 MI 3288 EI Tester Technical specifications Storage conditions: Temperature range ........-10 °C … 70 °C Maximum relative humidity......90 %RH (-10 C … 40 C) 80 %RH (40 C … 60 C) USB communication: USB ..............USB 2.0 Hi speed interface Connector .............

  • Page 139: Appendix A - Structure Objects

    Appendix A – Structure objects MI 3288 EI Tester Appendix A – Structure objects Structure elements used in Memory Organizer are instrument’s Profile dependent. Figure A.2: Memory organizer hierarchy Symbol Default name Parameters: Node Project name of project, description of project;...

  • Page 140: Appendix B - Profiles Selection Table

    Appendix B – Profile Selection Table MI 3288 EI Tester Appendix B – Profiles Selection Table Available profiles and measurement functions for the MI 3288: Profile Measurement functions available AVAB Code Name MI 3288 EI Group Icon • Voltage and Frequency Meter Voltage •...

  • Page 141: Appendix C - Functionality And Placing Of Test Probes

    Appendix C – Functionality and placing of test probes MI 3288 EI Tester 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 142 Appendix C – Functionality and placing of test probes MI 3288 EI Tester 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.
  • Page 143 Appendix C – Functionality and placing of test probes MI 3288 EI Tester Distance from earthing electrode E/ES to voltage probe S shall be: ❑ In case of a properly selected d1 the result of measurements 2 and 3 are symmetrical around the result of measurement 1.
  • Page 144 ❑ 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.5: Different measured voltage drops at low and high probe resistance...

  • Page 145: Appendix D - Programming Of Auto Sequences® On Metrel Es Manager

    Programming 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. D.1 Auto Sequence® Editor workspace To enter Auto Sequence®...

  • Page 146: Managing Groups Of Auto Sequences

    Appendix D – Programming of Auto Sequences®… MI 3288 EI Tester appropriate Single tests (measurements, inspections and custom inspections) and Flow commands and setting their parameters, arbitrary Auto Sequences® can be created. Figure D.2: Example of an Auto Sequence® header Figure D.3: Example of a measurement step...
  • Page 147 Appendix D – Programming of Auto Sequences®… MI 3288 EI Tester Opens starting Auto Sequence Editor screen. Opens a file (Group of Auto Sequences®). Creates a new file (Group of Auto Sequences®). Saves / Saves as the opened Group of Auto Sequences® to a file.

  • Page 148: Auto Sequences® Name, Description And Image Editing

    Appendix D – Programming of Auto Sequences®… MI 3288 EI Tester Auto Sequence®: Creates shortcut to selected Auto Sequence® Double click on the object name allows name edit: Auto Sequence® name: Edit Auto Sequence® name DOUBLE CLICK Folder name: Edit folder name Drag and drop of the selected Auto Sequence®...

  • Page 149: Search Within Selected Auto Sequence® Group

    The Result step contains the Result screen flow command by default. Other Flow commands can also be added to the Result step. D.3.2 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.

  • Page 150: Flow Commands

    Appendix D – Programming of Auto Sequences®… MI 3288 EI Tester D.3.3 Flow commands Flow commands are used to control the flow of measurements. Refer to chapter D.5 Description of flow commands for more information. D.3.4 Number of measurement steps Often the same measurement step has to be performed on multiple points on the device under test.

  • Page 151: Description Of Flow Commands

    Appendix D – Programming of Auto Sequences®… MI 3288 EI Tester D.5 Description of flow commands Double click on inserted Flow Command opens menu window, where text or picture can be entered, external commands can be activated and parameters can be set.

  • Page 152: Custom Inspection Programming

    Appendix D – Programming of Auto Sequences®… MI 3288 EI Tester Auto Sequence® results are stored in the momentary Auto Save workspace. A new Node with the date and time will be created. Under the Node Auto Sequence® results or (if Appliance info flow command is set) a new appliance and Auto Sequence®...
  • Page 153 Appendix D – Programming of Auto Sequences®… MI 3288 EI Tester Opens existing Custom Inspection Data file. By selecting, menu for browsing to location of *.indf file containing one or more Custom Inspections data appear on the screen. Selected file is opened in dedicated tab marked with file name.

  • Page 154: Applying Custom Inspections

    D.6.2 Applying Custom Inspections Custom inspections can be applied in Auto Sequences®. Direct assignment of Custom inspection to the Metrel ES manager structure objects is not possible. After custom created Inspection Data file is opened, available inspections are listed in Custom Inspections tab of Single test area of Auto Sequence®...
  • Page 155 After confirmation of selection, new Inspection Data file is opened and list of available Custom Inspections is changed. Note: If Metrel ES Manager Work scope is changed,  opened Inspection Data file remains active and available Custom Inspections remains the same.

Table of Contents