METREL MI 3125 Instruction Manual
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METREL MI 3125 Instruction Manual

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MI 3125
Instruction manual
Version 1.4, Code no. 20 751 753

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Summary of Contents for METREL MI 3125

  • Page 1 InstaltestCOMBO MI 3125 Instruction manual Version 1.4, Code no. 20 751 753...
  • Page 2 (European Union) concerning safety and electromagnetic compatibility regulations © 2009 METREL The trade names Metrel, Smartec, Instaltest, Autosequence are trademarks registered or pending in Europe and other countries. No part of this publication may be reproduced or utilized in any form or by any means...

  • Page 3: Table Of Contents

    Sound warnings ....................16 3.4.6 Help screens ....................... 16 3.4.7 Backlight and contrast adjustments ..............17 Instrument set and accessories...............18 3.5.1 Standard set MI 3125..................18 3.5.2 Optional accessories................... 18 Instrument operation....................19 Function selection ...................19 Settings ......................20 4.2.1 Language ......................20 4.2.2...
  • Page 4 MI 3125 InstaltestCOMBO Table of contents Maintenance......................47 Fuse replacement....................47 Cleaning ......................47 Periodic calibration ..................47 Upgrading the instrument ................47 Service ......................48 Technical specifications ..................49 Insulation resistance..................49 Continuity ......................49 Ω 7.2.1 Resistance R LOW ................... 49 RCD testing .....................50 7.3.1 General data ....................... 50 7.3.2...

  • Page 5: Preface

    In order for operator to be familiar enough with performing measurements in general and their typical applications it is advisable to read Metrel handbook Guide for testing and verification of low voltage installations. The instrument is equipped with the entire necessary accessory for comfortable testing.

  • 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 Instaltest 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 3125 InstaltestCOMBO Warnings and notes Warnings related to measurement functions: Insulation resistance Insulation resistance measurement should only be performed on de-energized objects! Do not touch the test object during the measurement or before it is fully discharged! Risk of electric shock!
  • Page 8 MI 3125 InstaltestCOMBO Warnings and notes Continuity functions If voltages of higher than 10 V (AC or DC) is detected between test terminals, the continuity resistance test will not be performed. Before performing a continuity measurement, where necessary, compensate test lead resistance.

  • Page 9: 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-Cd or Ni-MH batteries (size AA) can be used. Metrel recommends only using rechargeable batteries with a capacity of 2100mAh or above.

  • Page 10: 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 11: Standards Applied

    MI 3125 InstaltestCOMBO Standards applied 2.3 Standards applied The Instaltest 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 B (Hand-held equipment used in controlled EM environments)

  • Page 12: Instrument Description

    MI 3125 InstaltestCOMBO Front panel 3 Instrument description 3.1 Front panel Figure 3.1: Front panel Legend: 1 LCD 128 x 64 dots matrix display with backlight. 2 TEST Starts measurements. TEST Acts also as the PE touching electrode. 3 UP Modifies selected parameter.

  • Page 13: Connector Panel

    MI 3125 InstaltestCOMBO Connector panel 3.2 Connector panel Figure 3.2: Connector panel Legend: 1 Test connector Measuring inputs / outputs 2 Protection cover 3 Charger socket 4 PS/2 connector Serial port for upgrading the instrument. Warnings! Maximum allowed voltage between any test terminal and ground is 600 V!

  • Page 14: Back Side

    MI 3125 InstaltestCOMBO Back side 3.3 Back side Figure 3.3: Back side Legend: Side belt Battery compartment cover Fixing screw for battery compartment cover Back panel information label Holder for inclined position of the instrument Magnet for fixing instrument close to tested item (optional) Figure 3.4: Battery compartment...

  • Page 15: Display Organization

    MI 3125 InstaltestCOMBO Display organization 3.4 Display organization Function name Result field Test parameter field Message field Terminal voltage Figure 3.5: Typical function monitor display Battery indication 3.4.1 Terminal voltage monitor The terminal voltage monitor displays on-line the voltages on the test terminals and information about active test terminals.

  • Page 16: Result Field

    MI 3125 InstaltestCOMBO Display organization RCD tripped-out during the measurement (in RCD functions). Instrument is overheated. The measurement is prohibited until the temperature decreases under the allowed limit. High electrical noise was detected during measurement. Results may be impaired. L and N are changed.

  • Page 17: Backlight And Contrast Adjustments

    MI 3125 InstaltestCOMBO Display organization Figure 3.6: Examples of help screens 3.4.7 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 the Keep pressed for 1 s key is pressed again.

  • Page 18: Instrument Set And Accessories

    MI 3125 InstaltestCOMBO Instrument set and accessories 3.5 Instrument set and accessories 3.5.1 Standard set MI 3125 Instrument Short instruction manual Calibration Certificate Mains measuring cable Test lead 3 x1.5 m 3x test probe 3x crocodile clip Set of NiMH battery cells Power supply adapter CD with instruction manual, and “Guide for testing and verification of low...

  • Page 19: Instrument Operation

    MI 3125 InstaltestCOMBO Function selection 4 Instrument operation 4.1 Function selection For selecting test function the FUNCTION SELECTOR shall be used. Keys: Select test / measurement function: <VOLTAGE TRMS> Voltage and frequency and phase sequence. <Zline> Line impedance. <Zloop> Fault loop impedance.

  • Page 20: Settings

    MI 3125 InstaltestCOMBO Settings 4.2 Settings Different instrument options can be set in the SETTINGS menu. Options in both models are: Selection of language, Setting the instrument to initial values, Selection of reference standard for RCD test, Entering Isc factor, Commander support.

  • Page 21: Initial Settings

    MI 3125 InstaltestCOMBO Settings 4.2.2 Initial settings In this menu the instrument settings and measurement parameters and limits can be set to initial (factory) values. Figure 4.3: Initial settings dialogue Keys: TEST Restores default settings. Function selectors Exits back to main function menu without changes.

  • Page 22: Rcd Standard

    MI 3125 InstaltestCOMBO Settings 4.2.3 RCD standard In this menu the used standard for RCD tests can be set. Figure 4.4: Selection of RCD test standard Keys: UP / DOWN Selects standard. TEST Confirms selected standard. Function selectors Exits back to main function menu.

  • Page 23: Isc Factor

    MI 3125 InstaltestCOMBO Settings Maximum test times related to selected test current for general (non-delayed) RCD Standard ½×I 2×I 5×I ΔN ΔN ΔN ΔN EN 61008 / EN 61009 300 ms 300 ms 150 ms 40 ms EN 60364-4-41 1000 ms...
  • Page 24 MI 3125 InstaltestCOMBO Settings Keys: UP / DOWN Selects commander option. TEST Confirms selected option. Function selectors Exits back to main function menu. Note: This option is intended to disable the commander’s remote keys. In the case of high EM interfering noise the operation of the commander’s key can be irregular.

  • Page 25: Measurements

    MI 3125 InstaltestCOMBO Compensation of test leads resistance 5 Measurements 5.1 Compensation of test leads resistance This chapter describes how to compensate the test leads resistance in R LOWΩ, and SOCKET test. Compensation is required to eliminate the influence of test leads resistance and the internal resistances of the instrument on the measured resistance.

  • Page 26: Voltage, Frequency And Phase Sequence

    MI 3125 InstaltestCOMBO Voltage, frequency, phase sequence 5.2 Voltage, frequency and phase sequence Voltage and frequency measurement is always active in the terminal voltage monitor. In the special VOLTAGE TRMS menu the measured voltage, frequency and information about detected three-phase connection can be stored. Phase sequence measurement conforms to the EN 61557-7 standard.
  • Page 27 MI 3125 InstaltestCOMBO Voltage, frequency, phase sequence Voltage measurement procedure Select the VOLTAGE TRMS function using the function selector switch. Connect test cable to the instrument. Connect test leads to the item to be tested (see figures 5.6 and 5.7).

  • Page 28: Insulation Resistance

    MI 3125 InstaltestCOMBO Insulation resistance 5.3 Insulation resistance The Insulation resistance measurement is performed in order to ensure safety against electric shock through insulation. It is covered by the EN 61557-2 standard. Typical applications are: Insulation resistance between conductors of installation,...
  • Page 29 MI 3125 InstaltestCOMBO Insulation resistance Insulation resistance measuring procedure Select the function using the function selector switch. Set the required test voltage. Enable and set limit value (optional). Disconnect tested installation from mains supply (and discharge insulation as required). Connect test cable to the instrument and to the item to be tested (see figure 5.10).

  • Page 30: Resistance Of Earth Connection And Equipotential Bonding

    MI 3125 InstaltestCOMBO Resistance of earth connection 5.4 Resistance of earth connection and equipotential bonding The resistance measurement is performed in order to ensure that the protective measures against electric shock through earth connections and bondings are effective. Two sub-functions are available: R LOWΩ...

  • Page 31: R Lowω, 200 Ma Resistance Measurement

    MI 3125 InstaltestCOMBO Resistance of earth connection 5.4.1 R LOWΩ, 200 mA resistance measurement The resistance measurement is performed with automatic polarity reversal of the test voltage. Test circuit for R LOWΩ measurement Figure 5.13: Connection of universal test cable plus optional extension lead Resistance to earth connection and equipotential bonding measurement procedure Select continuity function using the function selector switch.

  • Page 32: Testing Rcds

    MI 3125 EurotestCOMBO Testing RCD 5.5 Testing RCDs Various test and measurements are required for verification of RCD(s) in RCD protected installations. Measurements are based on the EN 61557-6 standard. The following measurements and tests (sub-functions) can be performed: Contact voltage,...

  • Page 33: Contact Voltage (Rcd Uc)

    MI 3125 EurotestCOMBO Testing RCD Connections for testing RCD Figure 5.18: Connecting the plug commander and the universal test cable 5.5.1 Contact voltage (RCD Uc) A current flowing into the PE terminal causes a voltage drop on earth resistance, i.e.

  • Page 34: Trip-Out Time (Rcdt)

    MI 3125 EurotestCOMBO Testing RCD Contact voltage Uc RCD type Rated I ΔN proportional to 1.05×I ΔN 2×1.05×I ΔN ≥ 30 mA 1.4×1.05×I ΔN Both models 2×1.4×1.05×I ΔN < 30 mA 2×1.05×I ΔN 2×2×1.05×I ΔN Table 5.1: Relationship between Uc and I Δ...

  • Page 35: Trip-Out Current (Rcd I)

    MI 3125 EurotestCOMBO Testing RCD Displayed results: t ...Trip-out time, Uc..Contact voltage for rated I ΔN 5.5.3 Trip-out current (RCD I) A continuously rising residual current is intended for testing the threshold sensitivity for RCD trip-out. The instrument increases the test current in small steps through...

  • Page 36: Rcd Autotest

    MI 3125 EurotestCOMBO Testing RCD Displayed results: I ...Trip-out current, Contact voltage at trip-out current I or end value in case the RCD didn’t trip, t ...Trip-out time. 5.5.4 RCD Autotest RCD autotest function is intended to perform a complete RCD test (trip-out time at different residual currents, trip-out current and contact voltage) in one set of automatic tests, guided by the instrument.
  • Page 37 MI 3125 EurotestCOMBO Testing RCD Result examples: Step 1 Step 2 Step 3 Step 4 Step 5 Step 6 Step 7 Step 8 Figure 5.22: Individual steps in RCD autotest Bottom Figure 5.23: Two parts of result field in RCD autotest...
  • Page 38 MI 3125 EurotestCOMBO Testing RCD Displayed results: x1 ..Step 1 trip-out time ( I Δ N, 0º), x1 ..Step 2 trip-out time (I Δ N, 180º), x2 ..Step 3 trip-out time (2 × I Δ N, 0º), x2 ..Step 4 trip-out time (2 × I Δ N, 180º), x5 ..Step 5 trip-out time (5 ×...

  • Page 39: Fault Loop Impedance And Prospective Fault Current

    MI 3125 EurotestCOMBO Fault loop impedance 5.6 Fault loop impedance and prospective fault current Fault loop is a loop comprised by mains source, line wiring and PE return path to the mains source. The instrument measures the impedance of the loop and calculates the short circuit current.
  • Page 40 MI 3125 EurotestCOMBO Fault loop impedance Fault loop impedance measurement procedure Select the Zloop Zs rcd subfunction using the function selector switch and keys Select test parameters (optional). Connect test cable to the Instaltest Combo. Connect test leads to the item to be tested (see figure 5.25 and 5.18 ).

  • Page 41: Line Impedance And Prospective Short-Circuit Current

    MI 3125 EurotestCOMBO Line impedance 5.7 Line impedance and prospective short-circuit current Line impedance is measured in loop comprising of mains voltage source and line wiring. It is covered by requirements of the EN 61557-3 standard. See chapter 4.1 Function selection for instructions on key functionality.
  • Page 42 MI 3125 EurotestCOMBO Line impedance Line to neutral Line to line Figure 5.29: Examples of line impedance measurement result Displayed results: Z ....Line impedance, ....Prospective short-circuit current, Lim ..Low limit prospective short-circuit current value or high limit line impedance value for the UK version.

  • Page 43: Socket Outlet Test

    MI 3125 EurotestCOMBO Socket outlet test 5.8 Socket outlet test The Socket outlet test is an alternative test method for performing Polarity / Correct connections and PE conductor test on sockets as specified in the AS / NZS 3017. A sequence of four tests is carried out automatically:...
  • Page 44 MI 3125 EurotestCOMBO Socket outlet test Socket test measurement procedure Select the SOCKET function using the function selector switch. Select test parameters (optional). Connect test cable to the instrument. Compensate the test leads resistance (if necessary, see section 5.1 ).

  • Page 45: Pe Test Terminal

    MI 3125 EurotestCOMBO PE test terminal 5.9 PE test terminal It can happen that a dangerous voltage is applied to the PE wire or other accessible metal parts. This is a very dangerous situation since the PE wire and MPEs are considered to be earthed.
  • Page 46 MI 3125 EurotestCOMBO PE test terminal PE terminal test procedure Connect test cable to the instrument. Connect test leads to the item to be tested (see figures 5.37 and 5.38 ). Touch PE test probe (the TEST key) for at least one second.

  • Page 47: Maintenance

    MI 3125 EurotestCOMBO Maintenance 6 Maintenance Unauthorized persons are not allowed to open the Instaltest Combo instrument. There are no user replaceable components inside the instrument, except the battery and fuse under rear cover. 6.1 Fuse replacement There is a fuse under back cover of the Instaltest Combo instrument.

  • Page 48: Service

    MI 3125 EurotestCOMBO Maintenance Figure 6.1: Interface connection for data transfer over PC COM port 6.5 Service For repairs under warranty, or at any other time, please contact your distributor.

  • Page 49: Technical Specifications

    MI 3125 EurotestCOMBO Technical specification 7 Technical specifications 7.1 Insulation resistance Insulation resistance (nominal voltages 50 V , 100 V and 250 V Measuring range according to EN61557 is 0.25 M Ω ÷ 199.9 M Ω . Measuring range (M Ω ) Resolution (M Ω...

  • Page 50: Rcd Testing

    MI 3125 EurotestCOMBO Technical specification Open-circuit voltage......6.5 VDC ÷ 9 VDC Measuring current......min. 200 mA into load resistance of 2 Ω Test lead compensation.....up to 5 Ω The number of possible tests ....> 2000, with a fully charged battery Automatic polarity reversal of the test voltage.

  • Page 51: Trip-Out Time

    MI 3125 EurotestCOMBO Technical specification 7.3.3 Trip-out time Complete measurement range corresponds to EN 61557 requirements. Maximum measuring times set according to selected reference for RCD testing. Measuring range (ms) Resolution (ms) Accuracy 0.0 ÷ 40.0 ± 1 ms 0.0 ÷ max. time * ±...

  • Page 52: Rcd Selected

    MI 3125 EurotestCOMBO Technical specification Prospective fault current (calculated value) Measuring range (A) Resolution (A) Accuracy 0.00 ÷ 9.99 0.01 10.0 ÷ 99.9 Consider accuracy of fault 100 ÷ 999 loop resistance measurement 1.00k ÷ 9.99k 10.0k ÷ 23.0k The accuracy is valid if mains voltage is stabile during the measurement.

  • Page 53: Socket Test (Rln, Rlpe, Rnpe, Rpe)

    MI 3125 EurotestCOMBO Technical specification Prospective short-circuit current (calculated value) Measuring range (A) Resolution (A) Accuracy 0.00 ÷ 0.99 0.01 1.0 ÷ 99.9 Consider accuracy of line 100 ÷ 999 resistance measurement 1.00k ÷ 99.99k 100k ÷ 199k 1000 Test current (at 230 V)...... 6.5 A (10 ms) Nominal voltage range......

  • Page 54: Online Terminal Voltage Monitor

    MI 3125 EurotestCOMBO Technical specification Nominal voltage range...... 10 V ÷ 550 V 7.7.4 Online terminal voltage monitor Measuring range (V) Resolution (V) Accuracy 10 ÷ 550 ± (2 % of reading + 2 digits) 7.8 General data (6 × 1.5 V battery or accu, size AA) Power supply voltage......

  • Page 55: A Appendix A - Fuse Table

    MI 3125 EurotestCOMBO Appendix A A Appendix A - Fuse table A.1 Fuse table - IPSC Fuse type NV Rated Disconnection time [s] current Min. prospective short- circuit current (A) 32.5 22.3 18.7 15.9 65.6 46.4 38.8 31.9 18.7 102.8 56.5...
  • Page 56 MI 3125 EurotestCOMBO Appendix A 919.2 464.2 266.9 1217.2 821.7 663.3 319.1 1567.2 1133.1 964.9 836.5 447.9 2075.3 1429 1195.4 1018 585.4 Fuse type B Rated Disconnection time [s] current Min. prospective short- circuit current (A) Fuse type C Rated...
  • Page 57 MI 3125 EurotestCOMBO Appendix A Fuse type D Rated Disconnection time [s] current Min. prospective short- circuit current (A) 10.8 21.6 32.4 70.2 86.4 172.8...

  • Page 58: B Appendix B - Accessories For Specific Measurements

    MI 3125 EurotestCOMBO Appendix B B Appendix B - Accessories for specific measurements The table below presents standard and optional accessories required for specific measurement. The accessories marked as optional may also be standard ones in some sets. Please see attached list of standard accessories for your set or contact your distributor for further information.
  • Page 59 MI 3125 EurotestCOMBO Appendix B...
  • Page 60 MI 3125 EurotestCOMBO Appendix B...

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