METREL MicroOhm 2A MI 3242 Instruction Manual
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METREL MicroOhm 2A MI 3242 Instruction Manual

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MicroOhm 2A
MI 3242
Instruction manual
Version 1.0, Code no 20 752 011

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Summary of Contents for METREL MicroOhm 2A MI 3242

  • Page 1 MicroOhm 2A MI 3242 Instruction manual Version 1.0, Code no 20 752 011...
  • Page 2 Mark on your equipment certifies that this equipment meets the requirements of the EU (European Union) concerning safety and electromagnetic compatibility regulations © 2012 METREL 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: Table Of Contents

    MI 3242 MicroOhm 2A Table of contents Table of contents General description....................5 Features ......................5 Safety and operational considerations..............6 Warnings and notes ..................6 Battery and charging ..................8 2.2.1 New battery cells or cells unused for a longer period ........... 9 Standards applied ...................10 Instrument description..................11 Front panel ......................11 Connector panel ....................12...
  • Page 4 MI 3242 MicroOhm 2A Table of contents 7.5.3 Clearing individual measurements ..............34 Maintenance......................37 Cleaning ......................37 Periodic calibration ..................37 Service ......................37 Technical specifications...................38 10.1 Resistance measurement................38 10.2 Measurement parameters ................39 10.3 Voltage and frequency..................39 10.3.1 Voltage ........................ 39 10.3.2 Frequency ......................39 10.4 General data....................40...

  • Page 5: General Description

    MI 3242 MicroOhm 2A General description 1 General description 1.1 Features MI 3242 MicroOhm 2A is a portable, lightweight (< 1.5 kg) bidirectional low resistance ohmmeter using four wire Kelvin method to measure low resistances of:  Switches  Relays ...

  • Page 6: 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 MicroOhm 2A instruments in good condition and undamaged. When using the instrument, consider the following general warnings: symbol on the instrument means »Read the Instruction manual...
  • Page 7 MI 3242 MicroOhm 2A Safety and operational considerations Warnings related to measurement functions: Resistance, voltage and frequency measurements Resistance measurement should only be performed on de-energized objects!  Do not touch the test object during the measurement or before it is fully ...

  • Page 8: Battery And Charging

    If the instrument is not to be used for a long period of time, remove all batteries  from the battery compartment. Alkaline or rechargeable Ni-MH batteries (size AA) can be used. Metrel  recommends only using rechargeable batteries with a capacity of 2100mAh or above.

  • Page 9: New Battery Cells Or Cells Unused For A Longer Period

    Ni-Cd cells can be subjected to these chemical effects (sometimes called the memory effect). As a result the instrument operation time can be significantly reduced during the initial charging/discharging cycles of the batteries. In this situation, Metrel recommend the following procedure to improve the battery lifetime: Procedure Notes Completely charge the battery.

  • Page 10: Standards Applied

    MI 3242 MicroOhm 2A Safety and operational considerations 2.3 Standards applied The MicroOhm 2A instruments are 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 Safety (LVD) EN 61010-1...

  • Page 11: Instrument Description

    MI 3242 MicroOhm 2A Instrument description 3 Instrument description 3.1 Front panel The operator’s panel is shown in Figure 3.1 below. Figure 3.1: Front panel Legend: 128 x 64 dots matrix display with backlight. TEST Starts testing / confirms selected option Modifies selected parameter.

  • Page 12: Connector Panel

    MI 3242 MicroOhm 2A Instrument description 3.2 Connector panel Figure 3.2: Connector panel Legend: 1 Test connector Measuring inputs / outputs 2 Protection cover 3 Charger socket For connection of external charger 4 USB connector Communication with PC USB (1.1) port Communication with printer 5 PS/2 connector Communication with PC RS-232 port...

  • Page 13: Back Side

    MI 3242 MicroOhm 2A Instrument description 3.3 Back side Figure 3.3: Back side Legend: Inserts for side belt Battery compartment cover Fixing screw for battery compartment cover Back side information label Holder for inclined position of the instrument Figure 3.4: Battery compartment Legend: Battery cells Size AA, alkaline or rechargeable NiMH...

  • Page 14: Accessories

    The accessories consist of standard and optional accessories. Optional accessories can be delivered upon request. See attached list for standard configuration and options or contact your distributor or see the METREL home page: http://www.metrel.si. Figure 3.5: Standard set of the instrument Instrument MI 3242 MicroOhm 2A ...

  • Page 15: Display Organization

    MI 3242 MicroOhm 2A Instrument description 3.5 Display organization Function name Result field Test parameter field Figure 3.6: Typical function Message field display Battery and time indication 3.5.1 Battery and time indication The indication indicates the charge condition of battery and connection of external charger.

  • Page 16: Help Screens

    MI 3242 MicroOhm 2A Instrument description P1, P2, C1 or C2 terminal is not connected to the instrument or too high resistance is detected. Low test current (test current is out of defined limits Iset -10%). Measurement result is within defined limits. Measurement result is out of defined limits.

  • Page 17: Backlight And Contrast Adjustments

    MI 3242 MicroOhm 2A Instrument description 3.5.4 Backlight and contrast adjustments ☼ With the BACKLIGHT ( ) key backlight and contrast can be adjusted. Click Toggles backlight intensity level. Locks high intensity backlight level until power is turned off or Keep pressed for 1 s the key is pressed again.

  • Page 18: Instrument Operation

    MI 3242 MicroOhm 2A Instrument operation 4 Instrument operation Function selection For selecting test function the FUNCTION SELECTOR shall be used. Keys: Select test / measurement function: FUNCTION <RESISTANCE> Resistance measurement. SELECTOR <VOLTAGE TRMS> Voltage and frequency measurement. <SETTINGS> General instrument settings. UP/DOWN Selects sub-function in selected measurement function.

  • Page 19: Settings Menu

    MI 3242 MicroOhm 2A Settings menu 5 Settings menu In the Settings menu different parameters of the instrument can be viewed or set. Figure 5.1: Settings menu Keys: UP/DOWN Select the setting to adjust or view: <SELECT LANGUAGE> instrument language; <INITIAL SETTINGS>...

  • Page 20: Initial Settings

    MI 3242 MicroOhm 2A Settings menu Initial settings In this menu the following instrument parameters can be set to their initial values: all measurement parameters;  LCD settings;  language;  Figure 5.3: Initial settings menu Keys: Selects YES or NO Confirms selection.

  • Page 21: Memory

    MI 3242 MicroOhm 2A Settings menu Keys in Limits modifications screen: UP/DOWN Modifies selected limit. Save selection and returns to Limits Settings menu. FUNCTION Returns to Main menu without changes. SELECTOR Note: Limits won’t be saved if Hi limit value is lower than Lo limit value. “Not valid limits” ...

  • Page 22: Instrument Info

    MI 3242 MicroOhm 2A Settings menu 5.6 Instrument info In this menu the following instrument data is shown: instrument type;  model number;  firmware and hardware version;  serial number;  calibration date.  Figure 5.8: Instrument info menu Keys: FUNCTION SELECTOR...

  • Page 23: Measurements

    MI 3242 MicroOhm 2A Measurements 6 Measurements 6.1 Four wire Kelvin method When measuring resistance <20 Ω it is advisable to use a four wire measurement technique (Figure 6.1), for achieving high accuracy. By using this type of measurement configuration the test lead resistance is not included in the measurement, and the need for lead calibrating and balancing is eliminated.

  • Page 24: Resistance Measurement

    MI 3242 MicroOhm 2A Measurements 6.2 Resistance measurement Test can be started from the Resistance window. Before carrying out a test the parameters (Mode and Current) can be edited. Figure 6.2: Resistance menu Test parameters for Resistance measurement Mode Sub-function [Single, Continuous, Auto, Inductive] Current Test current [2 A, 100 mA, 10 mA] Keys:...

  • Page 25: Single Mode

    MI 3242 MicroOhm 2A Measurements Figure 6.4: Examples of Resistance measurement results Note: Consider displayed warnings when starting the measurement!  6.2.1 Single Mode Single mode makes a single bidirectional measurement. The instrument will measure resistance in both directions (thermal EMF elimination). The main result displayed on ...

  • Page 26: Continuous Mode

    MI 3242 MicroOhm 2A Measurements 6.2.2 Continuous Mode Continuous mode makes continuous bidirectional measurements. The instrument will measure resistance in both directions (thermal EMF elimination) and repeating the measurements until the TEST key will be pressed. The main result displayed on the ...

  • Page 27: Auto Mode

    MI 3242 MicroOhm 2A Measurements 6.2.3 Auto Mode Automatic mode makes a single bidirectional measurement. The instrument will measure resistance in both directions (thermal EMF elimination) and started a single measurement every time the P1, P2, C1 and C2 are connected to the test object. The main result displayed on the display is an average of the last bidirectional measurement ...

  • Page 28: Inductive Mode

    MI 3242 MicroOhm 2A Measurements 6.2.4 Inductive Mode Inductive mode makes a single unidirectional measurement. It is intended for measuring resistance on inductive objects. Depending on the size of the inductive object, testing times could be very short for small objects or very long for the larger, high inductive objects.

  • Page 29: Voltage Trms

    MI 3242 MicroOhm 2A Measurements 6.3 Voltage TRMS It is a simple function that continuously measures the voltage and frequency across C1, P1 – C2, P2 connector. Measured voltage and frequency in function VOLTAGE TRMS can be stored. Test circuit for voltage measurement Figure 6.9: Voltage TRMS connection Voltage TRMS procedure Select the VOLTAGE TRMS function.

  • Page 30: Data Handling

    MI 3242 MicroOhm 2A Data handling 7 Data handling 7.1 Memory organization Measurement results together with all relevant parameters can be stored in the instrument’s memory. After the measurement is completed, results can be stored to the flash memory of the instrument, together with the sub-results and function parameters. 7.2 Data structure The instrument’s memory place is divided into 3 levels each containing 199 locations.

  • Page 31: Storing Test Results

    MI 3242 MicroOhm 2A Data handling 7.3 Storing test results After the completion of a test the results and parameters are ready for storing ( icon is displayed in the information field). By pressing the MEM key, the user can store the results.

  • Page 32: Recalling Test Results

    MI 3242 MicroOhm 2A Data handling 7.4 Recalling test results Press the MEM key in a main function menu when there is no result available for storing or select MEMORY in the SETTINGS menu. Figure 7.3: Recall menu - structure field Figure 7.4: Recall menu - measurements selected field selected...

  • Page 33: Clearing Stored Data

    MI 3242 MicroOhm 2A Data handling 7.5 Clearing stored data 7.5.1 Clearing complete memory content Select CLEAR ALL MEMORY in MEMORY menu. A warning will be displayed. Figure 7.6: Clear all memory Keys in clear all memory menu: Selects YES or NO. TEST Confirms clearing memory (if YES is selected).

  • Page 34: Clearing Measurement(S) In Selected Location

    MI 3242 MicroOhm 2A Data handling 7.5.2 Clearing measurement(s) in selected location Select DELETE RESULTS in MEMORY menu. Figure 7.8: Clear measurements menu (structure field selected) Keys in delete results menu (structure field selected): Selects the location element (Object / Loc1 / Loc2). UP / DOWN Selects number of selected location element (1 to 199).
  • Page 35 MI 3242 MicroOhm 2A Data handling Keys in delete results menu (measurements field selected): UP / DOWN Selects measurement. Opens dialog confirmation clear selected TEST measurement. Returns to structure field. FUNCTION Exits back to Main menu without changes. SELECTOR Keys in dialog for confirmation to clear selected result(s): TEST Deletes selected measurement result.
  • Page 36 MI 3242 MicroOhm 2A Communication 8 Communication The instrument can communicate with the HVLink PRO PC software. The following action is supported:  Saved results can be downloaded and stored to a PC. A special communication program on the PC automatically identifies the instrument and enables data transfer between the instrument and the PC.

  • Page 37: Maintenance

    MI 3242 MicroOhm 2A Maintenance 9 Maintenance Unauthorized persons are not allowed to open the MicroOhm 2A instrument. There are no user replaceable components inside the instrument, except the battery. Warning: Disconnect all measuring accessory and switch off the instrument ...

  • Page 38: Technical Specifications

    MI 3242 MicroOhm 2A Technical specification Technical specifications 10.1 Resistance measurement Test current Resistance range Resolution Accuracy 0.000 … 9.999 mΩ 1 µΩ 10.00 … 99.99 mΩ 10 µΩ 100.0 … 999.9 mΩ 100 µΩ 0.00 … 99.99 mΩ 10 µΩ 100.0 …...

  • Page 39: Measurement Parameters

    MI 3242 MicroOhm 2A Technical specification 10.2 Measurement parameters Test current: 100 mA 10 mA Max. power output: 0,2 W 20 mW max. Output voltage: Limits: 1 μΩ … 199.9 Ω Table 10.2: Measurement parameters 10.3 Voltage and frequency 10.3.1 Voltage Measuring range (V) Resolution (V)

  • Page 40: General Data

    MI 3242 MicroOhm 2A Technical specification 10.4 General data (6  1.5 V battery or accu, size AA) Power supply voltage......9 V Idle state ........... > 25 h Measurements ........> 800 measurements of 500 m  load @ 2 A test current &...

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