METREL TeraOhm 5kV Plus User Manual
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METREL TeraOhm 5kV Plus User Manual

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TeraOhm 5kV Plus
MI 3201
User Manual
Version 1.6 Code No. 20 751 272

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Summary of Contents for METREL TeraOhm 5kV Plus

  • Page 1 TeraOhm 5kV Plus MI 3201 User Manual Version 1.6 Code No. 20 751 272...
  • Page 2 Mark on your equipment certifies that this equipment meets the requirements of the EU (European Union) concerning safety and interference causing equipment regulations © 2008 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 3201 TeraOhm 5 kV Plus Table of contents Table of contents General introduction ................... 4 Features ..................... 4 Applied Standards ..................4 Instrument Description..................5 Instrument Casing ..................5 Operator’s Panel ..................5 Connectors ....................6 Accessories ....................7 Test leads....................

  • Page 4: General Introduction

    General introduction 1 General introduction 1.1 Features The TeraOhm 5kV Plus Tester is a portable battery / mains powered test instrument intended for the testing of Insulation Resistance by using high test voltages of up to 5kV. The instrument is designed and produced with the extensive knowledge and experience acquired through many years of working in this sector.

  • Page 5: Instrument Description

    MI 3201 TeraOhm 5 kV Plus Instrument Description 2 Instrument Description 2.1 Instrument Casing The instrument is housed in a plastic box that maintains the protection class defined in the general specifications. 2.2 Operator’s Panel The operator’s panel is shown in Fig. 1 below. Fig.

  • Page 6: Connectors

    MI 3201 TeraOhm 5 kV Plus Instrument Description 2.3 Connectors The TeraOhm 5 kV Tester contains the following connections: Connection of test leads to four banana safety sockets (Fig. 2), Mains supply cable connection to the mains socket and communication socket (USB and RS232) (Fig.

  • Page 7: 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. 2.5 Test leads The standard length of test leads is 2m, optional lengths are 8m and 15m. For more details see attached list for standard configuration and options or contact your distributor or see the METREL home page: http://www.metrel.si.

  • Page 8: High Voltage Shielded Test Tips With High Voltage Alligator Clips

    MI 3201 TeraOhm 5 kV Plus Instrument Description 2.5.1 High voltage shielded test tips with High voltage alligator clips Application notes: These test leads is designed for diagnostic testing of insulation and also for hand held testing of insulation. Insulation ratings: High voltage banana connector (red, black): 10kV d.c (basic insulation);...

  • Page 9: Warnings

    In order to reach the highest level of operator’s safety while carrying out various measurements and tests using the TeraOhm 5kV Plus Tester, as well as to ensure that the test equipment remains undamaged, it is necessary to consider the following...
  • Page 10 MI 3201 TeraOhm 5 kV Plus Warnings  Do not touch any conductive parts of equipment under test during the test.  Make sure that the tested object is disconnected (mains voltage disconnected) before starting the Insulation Resistance measurement!  Do not touch the tested object whilst testing it, risk of electric shock! ...

  • Page 11: Performing Measurements

    MI 3201 TeraOhm 5 kV Plus Performing measurements 4 Performing measurements 4.1 Switching on the instrument Auto-calibration The instrument is switched ON by pressing the ON/OFF key. After turning on, the instrument will execute the auto-calibration (Fig. 4). Note: If batteries are defective or missing and the instrument is powered from mains supply, the instrument will not turn ON.

  • Page 12: Configuration

    MI 3201 TeraOhm 5 kV Plus Performing measurements bottom left angle of LCD screen the plug character and the flashing battery indicator will appear to indicate that the batteries are charging. Note: If batteries are defective or missing, the charger will not work. In lower left corner of LCD screen only plug character will be appeared (without battery indicator).

  • Page 13: Setup

    MI 3201 TeraOhm 5 kV Plus Performing measurements Fig. 5a. Configuration menu Parameter Value Note Memory clear Clear all memory locations Filter Fil1, Fil2, Fil3, Selection of noise rejecting filter, see the chapter Fil0 5.3. Filter Option DIAG. 0%..90% Adjustment of start of the timer in the Starting time DIAGNOSTIC TEST functions, according to the nominal voltage Unominal.
  • Page 14 MI 3201 TeraOhm 5 kV Plus Performing measurements Parameter Value Note Contrast 0%..100% Adjustment of the LCD contrast Time Set real time (hour: minute) Date Set current date (day-month-year) Com Port RS 232 2400, Set communication mode and rate. RS 232 4800, RS 232 9600, RS 232 19200, USB 115000...

  • Page 15: Measurements

    MI 3201 TeraOhm 5 kV Plus Measurements 5 Measurements 5.1 General Information about High DC voltage testing 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 16 MI 3201 TeraOhm 5 kV Plus Measurements and R - the surface resistivity (position of optional guard connection) iss1 iss2 – the actual insulation resistance of material – capacitance of material - represents polarization effects. Fig. 8 shows typical currents for that circuit. = overall test current (I test test...
  • Page 17 In general, insulators that are in good condition will show a “high” polarization index while insulators that are damaged will not. Note that this rule is not always valid. Refer to Metrel’s handbook Insulation Testing Techniques for more information. General applicable values:...
  • Page 18 MI 3201 TeraOhm 5 kV Plus Measurements and reaches the final test voltage with a slope that keeps the charging current under the limit of the current threshold. The test duration normally takes 1 min. Withstanding voltage test or dielectric test is usually applied for: Type (acceptance) tests when a new product is being prepared for manufacture, Routine (production) tests for the verification of safety on each product, Maintenance and after service tests for any equipment where insulation system can...

  • Page 19: Guard Terminal

    MI 3201 TeraOhm 5 kV Plus Measurements 5.2 Guard terminal The purpose of the GUARD terminal is to lead away potential leakage currents (e.g. surface currents), which are not a result of the measured insulation material itself but are a result of surface contamination and moisture. This current interferes with the measurement i.e.

  • Page 20: Filter Options

    MI 3201 TeraOhm 5 kV Plus Measurements 5.3 Filter options Filters are built in to reduce the influence of noise on measurement results. This option enables more stable results especially when dealing with high Insulation Resistances (Insulation Resistance, Diagnostic Test, Step Voltage). In these functions, the status of the filter option is shown in the top right corner of the LCD screen.

  • Page 21: Voltage Measurement

    MI 3201 TeraOhm 5 kV Plus Measurements 5.4 Voltage measurement Selecting this function displays the following states (initial state and state with results after completion of the measurement). See fig. 10 below. Fig. 10. Voltage function display states Measurement procedure: Connect the test leads to the instrument and to the measured source.

  • Page 22: Insulation Resistance Measurement

    MI 3201 TeraOhm 5 kV Plus Measurements 5.5 Insulation Resistance measurement Selecting this function displays the following states (initial state and state with results after the completion of the measurement). Fig 11 shows states when Graph R(t) is disabled. Initial display – numerical mode Display with results - numerical mode Fig.
  • Page 23 MI 3201 TeraOhm 5 kV Plus Measurements Measurement procedure: Connect the test leads to the instrument and to the test object. Select INSULATION RESISTANCE function in MAIN MENU. Press the START/STOP key and release it, continuous measurement will begin. Wait until the test result has stabilized then press the START/STOP key again to stop the measurement or, if enabled, wait for the set timer runs out.
  • Page 24 MI 3201 TeraOhm 5 kV Plus Measurements Setting up parameters for Insulation Resistance test: Press the SELECT key, the set-up menu will appear on the display, see the Fig 13. Select the parameter (line) to be set using the  and ...
  • Page 25 MI 3201 TeraOhm 5 kV Plus Measurements Fig. 15. Set-up menu of the Graph R(t) Notes: If the Timer is OFF is not possible to Enable the Graph R(t). The time duration of Graph R(t) is equal to the value of Timer. The Timer value could be very long (up to 100 minutes), so the Special automatic decimation algorithm is use to write the Graph R(t) to the LCD.

  • Page 26: Diagnostic Test

    MI 3201 TeraOhm 5 kV Plus Measurements 5.6 Diagnostic Test Selecting this function displays the following states (initial state and state with results after the completion of the measurement). ). Fig. 16 shows states when Graph R(t) is disabled. Initial display – numerical mode Display with results –...
  • Page 27 MI 3201 TeraOhm 5 kV Plus Measurements Diagnostic test is a long duration test for evaluating the quality of the insulation material under test. The results of this test enable the decision to be made on the preventive replacement of the insulation material. DIELECTRIC ABSORPTION RATIO (DAR) DAR is ratio of Insulation Resistance values measured after 15s and after 1 minute.
  • Page 28 MI 3201 TeraOhm 5 kV Plus Measurements   PI    Note: When determining Riso (1min) pay close attention to the capacitance of the object under test. It has to be charged-up in the first time section (1 min). Approximate maximum capacitance using: ...
  • Page 29 MI 3201 TeraOhm 5 kV Plus Measurements Measurement procedure: Select DIAGNOSTIC TEST function in MAIN MENU. Connect the test leads to the instrument and to the measured object. Press the START/STOP key to start the measurement. Wait until set timer runs out, the result is displayed. Wait until the object under test has discharged The result can optionally be saved by pressing the MEM key twice, see the chapter 6.1.
  • Page 30 MI 3201 TeraOhm 5 kV Plus Measurements Legend of displayed symbols: DIAGNOSTIC TEST Name of selected function SETTING PARAMETERS: Unominal 5000V Set test voltage – step 25 V Time1 01min Time node to take R1min result Time2 02min Time node to take R2min result and calculate DAR Time node to take R3min result and Time3...
  • Page 31 MI 3201 TeraOhm 5 kV Plus Measurements Fig. 21. Set-up menu of the Graph R(t) Notes: The time duration of Graph R(t) is equal to the value of Timer 3. The Timer value could be very long (up to 100 minutes), so the Special automatic decimation algorithm is use to write the Graph R(t) to the LCD.

  • Page 32: Step Voltage Insulation Resistance Testing

    MI 3201 TeraOhm 5 kV Plus Measurements 5.7 Step Voltage Insulation Resistance testing Selecting this function displays the following states (initial state and state with results after the completion of the measurement). Fig. 22 shows states when Graph R(t) is disabled.
  • Page 33 MI 3201 TeraOhm 5 kV Plus Measurements In this test, the insulation is measured in five equal time periods with test voltages from one fifth of the final test voltage up to full scale (see the Fig. 24). This function illustrates the relationship of a materials Insulation resistance and its applied voltage Measurement procedure: Connect the test leads to the instrument and to the test object.
  • Page 34 MI 3201 TeraOhm 5 kV Plus Measurements Notes: Timer information is displayed from the start of the measurement until the completion of each step measurement. Timer information shows the complete measurement period after the completion of the measurement. A high-voltage warning symbol appears on the display during the measurement to warn the operator of a potentially dangerous test voltage.
  • Page 35 MI 3201 TeraOhm 5 kV Plus Measurements Fig. 27. Set-up menu of the Graph R(t) Notes: The time duration of Graph R(t) is equal to the value of Step Time Multiplied by 5. The Timer value could be very long (up to 150 minutes), so the Special automatic decimation algorithm is use to write the Graph R(t) to the LCD.

  • Page 36: Withstanding Voltage

    MI 3201 TeraOhm 5 kV Plus Measurements 5.8 Withstanding voltage This function offers Withstanding Voltage test of insulation material. It covers two types of tests: a) Breakdown voltage testing of high voltage device, e.g. transient suppressors b) DC withstanding voltage test for insulation coordination purposes. Both functions require breakdown current detection.
  • Page 37 MI 3201 TeraOhm 5 kV Plus Measurements Legend of displayed symbols: WITHSTANDING VOLTAGE DC Name of selected function 1000V Start test voltage 5000V Stop test voltage 5275V Actual test voltage – measured value I=0.001mA Actual test current – measured value Timer information tm:01min 00s Measuring procedure:...
  • Page 38 MI 3201 TeraOhm 5 kV Plus Measurements Set-up parameters for Withstanding Voltage: Press the SELECT key, (the set-up menu (Fig. 30) appears on display); Select the parameter (line) to be set using the  and  keys; Adjust the parameter using the  and  keys or skip to the next sub-parameter by pressing the SELECT key (if there are two or more sub-parameters) and repeat the adjustment.

  • Page 39: Working With Your Results

    MI 3201 TeraOhm 5 kV Plus Working with your Results 6 Working with your Results 6.1 Storing, Recalling and Clearing Results The instrument contains battery supported storage memory to retain results when power is disconnected. This enables the test engineer to make the measurements and then to recall them later on.
  • Page 40 MI 3201 TeraOhm 5 kV Plus Working with your Results Function List of stored data Voltage Function name Measured voltage Frequency of the measured voltage Ser. number of stored result Date * Time * Insulation resistance Function name Measured insulation resistance value Set test voltage Actual test voltage - measured value Actual test current - measured value...

  • Page 41: Transferring Data To A Pc

    MI 3201 TeraOhm 5 kV Plus Working with your Results Step voltage Function name Last measured insulation resistance Set test voltage Actual test voltage - measured value Actual test current - measured value Capacitance of the tested object Complete duration of the measurement First step measured resistance with its nominal voltage First step actual test voltage - measured value Second step measured resistance with its nominal voltage...

  • Page 42: Maintenance

    MI 3201 TeraOhm 5 kV Plus Maintenance 7 Maintenance 7.1 Inspection To maintain the operator’s safety and to ensure the reliability of the instrument it is advisable to inspect the instrument on a regular basis. Check that the instrument and its accessories are not damaged.
  • Page 43 MI 3201 TeraOhm 5 kV Plus Maintenance  Turn the power off and disconnect any measurement accessories or mains supply cable connected to the instrument before opening the battery cover to avoid electric shock.  Remove the battery cover.  All six cells have to be replaced and they have to be of the same type. ...

  • Page 44: Cleaning

    MI 3201 TeraOhm 5 kV Plus Measurements 7.4 Cleaning Use a soft cloth, slightly moistened with soapy water or spirit to clean the surface of the instrument and leave the instrument to dry totally before using it. Notes!  Do not use liquids based on petrol or hydrocarbons! ...

  • Page 45: Specifications

    MI 3201 TeraOhm 5 kV Plus Specifications 8 Specifications 8.1 Measurement specifications Note: All data regarding accuracy is given for nominal (reference) environment condition. Insulation resistance Nominal test voltage: 250 V to 5 kV, steps by 25V Current capability of test generator: >1 mA Short-circuit test current: 5 mA10%...
  • Page 46 MI 3201 TeraOhm 5 kV Plus Specifications Noise current rejection (resistive load) Fil0 Fil1 Fil2 Fil3 Generator Capability vs Resistance [ M ] Utest=5kV Dielectric absorption ratio DAR Display range DAR Resolution Accuracy 0.01  9.99 (5% of reading + 2digits) 0.01 10.0 ...
  • Page 47 MI 3201 TeraOhm 5 kV Plus Specifications Display range Test voltage (V) Resolution Accuracy 0  5500 V (3 % of reading + 3 V) Withstanding voltage DC DC test voltage: Voltage value: 250V to 5kV, steps 25V. Accuracy: -0 / +10 % + 20 V. Display range Test voltage (V) Resolution Accuracy...

  • Page 48: General Specifications

    MI 3201 TeraOhm 5 kV Plus Specifications 8.2 General specifications Battery power supply ........7.2 V DC (6 × 1.2V NiMH C size) Mains power supply ........90-260 45-65 (300V CAT III) Protection classification ......... double insulation Over-voltage category ........600 V CAT IV Pollution degree..........

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