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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 LOW

Ω

, 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.

The

symbol is displayed if the compensation was carried out successfully.

Circuits for compensating the resistance of test leads

N/L2

L/L1

PE/L3

N/L2

PE/L3

prolongation lead

Figure 5.1: Shorted test leads

Compensation of test leads resistance procedure

Select R LOW

Ω

, or SOCKET test function.

Connect

test cable to the instrument and short the test leads together (see

figure

5.1

Press

TEST

to perform

resistance measurement.

Press the

CAL

key to compensate leads resistance.

Figure 5.2: Results with old calibration

values

Figure 5.3: Results with new calibration

values

Note:

The highest value for lead compensation is 5

. If the resistance is higher the

compensation value is set back to default value.

is displayed if no calibration value is stored.

Summary of Contents for EurotestCOMBO MI 3125

Page 1: ...InstaltestCOMBO MI 3125 Instruction manual Version 1 4 Code no 20 751 753 ...

Page 2: ...ipment meets the requirements of the EU 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 without permission in writing from METREL ...

Page 3: ...sories 18 3 5 1 Standard set MI 3125 18 3 5 2 Optional accessories 18 4 Instrument operation 19 4 1 Function selection 19 4 2 Settings 20 4 2 1 Language 20 4 2 2 Initial settings 21 4 2 3 RCD standard 22 4 2 4 Isc factor 23 4 2 5 Commander support 23 5 Measurements 25 5 1 Compensation of test leads resistance 25 5 2 Voltage frequency and phase sequence 26 5 3 Insulation resistance 28 5 4 Resistanc...

Page 4: ...c 50 7 3 3 Trip out time 51 7 3 4 Trip out current 51 7 4 Fault loop impedance and prospective fault current 51 7 4 1 No disconnecting device or FUSE selected 51 7 4 2 RCD selected 52 7 5 Line impedance and prospective short circuit current 52 7 6 Socket test RLN RLPE RNPE RPE 53 7 7 Voltage frequency and phase rotation 53 7 7 1 Phase rotation 53 7 7 2 Voltage 53 7 7 3 Frequency 53 7 7 4 Online te...

Page 5: ...sistance tests RCD testing Fault loop RCD trip lock impedance measurements Line impedance Phase sequence The graphic display with backlight offers easy reading of results indications measurement parameters and messages Two LED Pass Fail indicators are placed at the sides of the LCD The operation of the instrument is designed to be as simple and clear as possible and no special training except for ...

Page 6: ...nown precautions in order to avoid risk of electric shock while dealing with hazardous voltages Do not use the instrument in supply systems with voltages higher than 550 V Service intervention or adjustment is only allowed to be carried out by a competent authorized personnel Use only standard or optional test accessories supplied by your distributor Consider that older accessories and some of the...

Page 7: ...re the cause of the fault is eliminated before proceeding with any activity SOCKET test Use Resistance box A 1195 only for testing with lines disconnected from main supply Notes related to measurement functions General The indicator means that the selected measurement cannot be performed because of irregular conditions on input terminals Insulation resistance continuity functions can only be perfo...

Page 8: ... when trip out time is out of allowable time period Z LOOP The low limit prospective short circuit current value depends on fuse type fuse current rating fuse trip out time and impedance scaling factor The specified accuracy of tested parameters is valid only if the mains voltage is stable during the measurement Fault loop impedance measurements will trip an RCD The measurement of fault loop imped...

Page 9: ...ly recognizes the connected power supply adapter and begins charging Symbols Indication of battery charging Figure 2 3 Charging indication When connected to an installation the instruments battery compartment can contain hazardous voltage inside When replacing battery cells or before opening the battery fuse compartment cover disconnect any measuring accessory connected to the instrument and turn ...

Page 10: ...e the batteries to their normal capacity Notes The charger in the instrument is a pack cell charger This means that the battery cells are connected in series during the charging The battery cells have to be equivalent same charge condition same type and age One different battery cell can cause an improper charging and incorrect discharging during normal usage of the entire battery pack it results ...

Page 11: ...ms up to 1000 VAC and 1500 VAC Equipment for testing measuring or monitoring of protective measures Part 1 General requirements Part 2 Insulation resistance Part 3 Loop resistance Part 4 Resistance of earth connection and equipotential bonding Part 6 Residual current devices RCDs in TT and TN systems Part 7 Phase sequence Part 10 Combined measuring equipment Other reference standards for testing R...

Page 12: ... CAL Calibrates test leads in Continuity functions 6 Function selectors Selects test function 7 Backlight Contrast Changes backlight level and contrast Switches the instrument power on or off The instrument automatically turns off 15 minutes after the last key was pressed 8 ON OFF In RCD Auto toggles between top and bottom parts of results field 9 HELP Accesses help menus 10 TAB Selects the parame...

Page 13: ... 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 Maximum allowed voltage between test terminals is 600 V Maximum short term voltage of external power supply adapter is 14 V ...

Page 14: ...ixing screw for battery compartment cover 4 Back panel information label 5 Holder for inclined position of the instrument 6 Magnet for fixing instrument close to tested item optional Figure 3 4 Battery compartment Legend 1 Battery cells Size AA alkaline or rechargeable NiMH NiCd 2 Serial number label 3 Fuse M 0 315 A 250 V ...

Page 15: ...e used for selected measurement L and PE are active test terminals N terminal should also be connected for correct input voltage condition 3 4 2 Battery indication The indication indicates the charge condition of battery and connection of external charger Battery capacity indication Low battery Battery is too weak to guarantee correct result Replace or recharge the battery cells Recharging in prog...

Page 16: ...est leads resistance in Continuity measurement is compensated 3 4 4 Result field Measurement result is inside pre set limits PASS Measurement result is out of pre set limits FAIL Measurement is aborted Consider displayed warnings and messages 3 4 5 Sound warnings Continuous sound Warning Dangerous voltage on the PE terminal is detected 3 4 6 Help screens HELP Opens help screen Help menus are avail...

Page 17: ... Toggles backlight intensity level Keep pressed for 1 s Locks high intensity backlight level until power is turned off or the key is pressed again Keep pressed for 2 s Bargraph for LCD contrast adjustment is displayed Figure 3 7 Contrast adjustment menu Keys for contrast adjustment DOWN Reduces contrast UP Increases contrast TEST Accepts new contrast Function selectors Exits without changes ...

Page 18: ... 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 voltage installations handbook Soft hand strap RS232 PS2 cable 3 5 2 Optional accessories See the attached sheet for a list of optional accessories that are available on request from your distributor ...

Page 19: ...est SETTINGS General instrument settings UP DOWN Selects sub function in selected measurement function TAB Selects the test parameter to be set or modified TEST Runs selected test measurement function Keys in test parameter field UP DOWN Changes the selected parameter TAB Selects the next measuring parameter FUNCTION SELECTOR Toggles between the main functions General rule regarding enabling param...

Page 20: ...d for RCD test Entering Isc factor Commander support Figure 4 1 Options in Settings menu Keys UP DOWN Selects appropriate option TEST Enters selected option Function selectors Exits back to main function menu 4 2 1 Language In this menu the language can be set Figure 4 2 Language selection Keys UP DOWN Selects language TEST Confirms selected language and exits to settings menu Function selectors E...

Page 21: ...he default setup is listed below Instrument setting Default value Contrast As defined and stored by adjustment procedure Isc factor 1 00 RCD standards EN 61008 EN 61009 Language English Function Sub function Parameters limit value R ISO No limit Utest 500 V Low Ohm Resistance R LOWΩ No limit SOCKET No limit Z LINE Fuse type none selected Z LOOP Fuse type none selected Zs rcd Fuse type none selecte...

Page 22: ...t times according to EN 60364 4 41 IΔN IΔN 2 IΔN 5 IΔN General RCDs non delayed tΔ 999 ms tΔ 999 ms tΔ 150 ms tΔ 40 ms Selective RCDs time delayed tΔ 999 ms 130 ms tΔ 999 ms 60 ms tΔ 200 ms 50 ms tΔ 150 ms Trip out times according to BS 7671 IΔN IΔN 2 IΔN 5 IΔN General RCDs non delayed tΔ 1999 ms tΔ 300 ms tΔ 150 ms tΔ 40 ms Selective RCDs time delayed tΔ 1999 ms 130 ms tΔ 500 ms 60 ms tΔ 200 ms 5...

Page 23: ...S NZ IV 1000 ms 1000 ms 200 ms 150 ms 4 2 4 Isc factor In this menu the Isc factor for calculation of short circuit current in Z LINE and Z LOOP measurements can be set Figure 4 5 Selection of Isc factor Keys UP DOWN Sets Isc value TEST Confirms Isc value Function selectors Exits back to main function menu Short circuit current Isc in the supply system is important for selection or verification of...

Page 24: ...ommander 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: ...pensating the resistance of test leads N L2 L L1 L L1 PE L3 N L2 PE L3 prolongation lead Figure 5 1 Shorted test leads Compensation of test leads resistance procedure Select R LOWΩ or SOCKET test function Connect test cable to the instrument and short the test leads together see figure 5 1 Press TEST to perform resistance measurement Press the CAL key to compensate leads resistance Figure 5 2 Resu...

Page 26: ...o the EN 61557 7 standard See chapter 4 1 Function selection for instructions on key functionality Figure 5 4 Voltage in single phase system Test parameters for voltage measurement There are no parameters to set Connections for voltage measurement L3 L2 L1 N PE N L2 N L2 L L1 L L1 PE L3 PE L3 result 1 2 3 result 2 1 3 Figure 5 5 Connection of universal test cable and optional adapter in three phas...

Page 27: ... Figure 5 8 Examples of voltage measurement in three phase system Displayed results for single phase system Uln Voltage between phase and neutral conductors Ulpe Voltage between phase and protective conductors Unpe Voltage between neutral and protective conductors f frequency Displayed results for three phase system U12 Voltage between phases L1 and L2 U13 Voltage between phases L1 and L3 U23 Volt...

Page 28: ...e rooms walls and floors Insulation resistance of ground cables Resistance of semi conductive antistatic floors See chapter 4 1 Function selection for instructions on key functionality Figure 5 9 Insulation resistance Test parameters for insulation resistance measurement Uiso Test voltage 50 V 100 V 250 V 500 V 1000 V Limit Minimum insulation resistance OFF 0 01 MΩ 200 MΩ Test circuits for insulat...

Page 29: ...pply and discharge insulation as required Connect test cable to the instrument and to the item to be tested see figure 5 10 Press the TEST key to perform the measurement double click for continuous measurement and later press to stop the measurement After the measurement is finished wait until tested item is fully discharged Figure 5 11 Example of insulation resistance measurement result Displayed...

Page 30: ...gainst electric shock through earth connections and bondings are effective Two sub functions are available R LOWΩ Earth bond resistance measurement according to EN 61557 4 200 mA See chapter 4 1 Function selection for instructions on key functionality Figure 5 12 200 mA RLOW Ω Test parameters for resistance measurement TEST Resistance measurement sub function R LOWΩ Limit Maximum resistance OFF 0 ...

Page 31: ... measurement procedure Select continuity function using the function selector switch Set sub function to R LOWΩ Enable and set limit optional Connect test cable to the instrument Compensate the test leads resistance if necessary see section 5 1 Disconnect from mains supply and discharge installation to be tested Connect the test leads to the appropriate PE wiring see figure 5 13 Press the TEST key...

Page 32: ...mA 500 mA 1000 mA type RCD type test current waveform plus starting polarity MUL Multiplication factor for test current 1 2 5 IΔN Ulim Conventional touch voltage limit 25 V 50 V Notes Ulim can be selected in the Uc sub function only The instrument is intended for testing of General non delayed and S elective time delayed RCDs which are suited for Alternating residual current AC type marked with sy...

Page 33: ...imit voltage The contact voltage is measured with a test current lower than IΔN to avoid trip out of the RCD and then normalized to the rated IΔN Contact voltage measurement procedure Select the RCD function using the function selector switch Set sub function Uc Set test parameters if necessary Connect test cable to the instrument Connect test leads to the item to be tested see figure 5 18 Press t...

Page 34: ...sion Figure 5 19 Example of contact voltage measurement results Displayed results Uc Contact voltage Rl Fault loop resistance 5 5 2 Trip out time RCDt Trip out time measurement verifies the sensitivity of the RCD at different residual currents Trip out time measurement procedure Select the RCD function using the function selector switch Set sub function RCDt Set test parameters if necessary Connec...

Page 35: ...Note AC 0 2 IΔN 1 1 IΔN Sine A IΔN 30 mA 0 2 IΔN 1 5 IΔN A IΔN 10 mA 0 2 IΔN 2 2 IΔN Pulsed Both models Maximum test current is IΔ trip out current or end value in case the RCD didn t trip out Trip out current measurement procedure Select the RCD function using the function selector switch Set sub function RCD I Set test parameters if necessary Connect test cable to the instrument Connect test lea...

Page 36: ...elect the RCD function using the function selector switch Set sub function AUTO Set test parameters if necessary Connect test cable to the instrument Connect test leads to the item to be tested see figure 5 18 Press the TEST key to perform the test Start of test Test with IΔN 0 step 1 RCD should trip out Re activate RCD Test with IΔN 180 step 2 RCD should trip out Re activate RCD Test with 2 IΔN 0...

Page 37: ...EurotestCOMBO Testing RCD 37 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 Top Bottom Figure 5 23 Two parts of result field in RCD autotest ...

Page 38: ...rip out current 0º I Step10 trip out current 180º Uc Contact voltage for rated IΔN Notes The autotest sequence is immediately stopped if any incorrect condition is detected e g excessive Uc or trip out time out of bounds Auto test is finished without x5 tests in case of testing the RCD type A with rated residual currents of IΔn 300 mA 500 mA and 1000 mA In this case auto test result passes if all ...

Page 39: ...ction selection for instructions on key functionality Figure 5 24 Fault loop impedance Test parameters for fault loop impedance measurement Test Selection of fault loop impedance sub function Zloop Zs rcd Fuse type Selection of fuse type NV gG B C K D Fuse I Rated current of selected fuse Fuse T Maximum breaking time of selected fuse Lim Minimum short circuit current for selected fuse See Appendix...

Page 40: ...t current value or high limit fault loop impedance value for the UK version Prospective fault current ISC is calculated from measured impedance as follows Z k Un I SC SC where Un Nominal UL PE voltage see table below ksc Correction factor for Isc see chapter 4 2 6 Un Input voltage L PE 115 V 100 V UL PE 160 V 230 V 160 V UL PE 264 V Notes High fluctuations of mains voltage can influence the measur...

Page 41: ... of selected fuse FUSE T Maximum breaking time of selected fuse Lim Minimum short circuit current for selected fuse See Appendix A for reference fuse data Connections for measurement of line impedance L1 L2 L3 N PE RE Ro L PE N L L1 N L2 PE L3 N L2 L L1 PE L3 Figure 5 28 Phase neutral or phase phase line impedance measurement connection of plug commander and universal test cable Line impedance mea...

Page 42: ...ion Prospective short circuit current is calculated as follows Z k Un I SC SC where Un Nominal L N or L1 L2 voltage see table below ksc Correction factor for Isc see chapter 4 2 6 Un Input voltage range L N or L1 L2 115 V 100 V UL N 160 V 230 V 160 V UL N 264 V 400 V 264 V UL N 440 V Note High fluctuations of mains voltage can influence the measurement results the noise sign is displayed in the me...

Page 43: ...g the trailing lead All three test leads must be connected during the test Usually the circuit is terminated with the Resistance box A 1195 at the switchboard side See chapter 4 1 Function selection for instructions on key functionality Figure 5 34 Socket test Test parameters for socket test LIMITS Rln Rlpe Rnpe Resistances No limit socket Switch ON and Switch OFF LIMIT Rpe Maximum resistance OFF ...

Page 44: ...orm the measurement Figure 5 36 Examples of Socket test result Displayed results Rln Resistance between L and N terminals Rlpe Resistance between L and PE terminals Rnpe Resistance between N and PE terminals Rpe Resistance of PE conductor between socket PE terminal and PE bar in the switchboard Notes Take care about correct termination at the switchboard side All three test leads are usually conne...

Page 45: ...g see examples below When touching the TEST key in all functions that require mains supply the user automatically performs this test Examples for application of PE test terminal L1 N PE Reversed phase and protection conductors T MOST DANGEROUS SITUATION HE Figure 5 37 Reversed L and PE conductors application of plug commander L1 N Reversed phase and protection conductors MOST DANGEROUS SITUATION P...

Page 46: ...ted to phase voltage the warning message is displayed instrument buzzer is activated and further measurements are disabled in Z LOOP and RCD functions Warning If dangerous voltage is detected on the tested PE terminal immediately stop all measurements find and remove the fault Notes In the SETTINGS and VOLTAGE TRMS menus the PE terminal is not tested PE test terminal does not operate in case the o...

Page 47: ...hapter 3 3 Back panel 6 2 Cleaning No special maintenance is required for the housing To clean the surface of the instrument use a soft cloth slightly moistened with soapy water or alcohol Then leave the instrument to dry totally before use Warnings Do not use liquids based on petrol or hydrocarbons Do not spill cleaning liquid over the instrument 6 3 Periodic calibration It is essential that the ...

Page 48: ...MI 3125 EurotestCOMBO Maintenance 48 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: ...DC 500 VDC 1000 VDC Open circuit voltage 0 20 of nominal voltage Measuring current min 1 mA at RN UN 1 kΩ V Short circuit current max 3 mA The number of possible tests 1200 with a fully charged battery Auto discharge after test Specified accuracy is valid if universal test cable is used while it is valid up to 100 MΩ if tip commander is used Specified accuracy is valid up to 100 MΩ if relative hum...

Page 50: ... 1 2 IΔN 1 IΔN 2 IΔN 5 RCD IΔ IΔN mA AC A AC A AC A AC A AC A 10 5 3 5 10 20 20 40 50 100 9 9 30 15 10 5 30 42 60 84 150 212 9 9 100 50 35 100 141 200 282 500 707 9 9 300 150 105 300 424 600 848 1500 n a 9 9 500 250 175 500 707 1000 1410 2500 n a 9 9 1000 500 350 1000 1410 2000 n a n a n a 9 9 n a not applicable AC type sine wave test current A type pulsed current 7 3 2 Contact voltage RCD Uc Meas...

Page 51: ...EN 61557 requirements Measuring range IΔ Resolution IΔ Accuracy 0 2 IΔN 1 1 IΔN AC type 0 05 IΔN 0 1 IΔN 0 2 IΔN 1 5 IΔN A type IΔN 30 mA 0 05 IΔN 0 1 IΔN 0 2 IΔN 2 2 IΔN A type IΔN 30 mA 0 05 IΔN 0 1 IΔN Trip out time Measuring range ms Resolution ms Accuracy 0 300 1 3 ms Contact voltage Measuring range V Resolution V Accuracy 0 0 19 9 0 1 0 15 of reading 10 digits 20 0 99 9 0 1 0 15 of reading T...

Page 52: ...lution Ω Accuracy 0 00 9 99 0 01 10 0 99 9 0 1 5 of reading 10 digits 100 999 1 1 00k 9 99k 10 10 of reading Accuracy may be impaired in case of heavy noise on mains voltage Prospective fault current calculated value Measuring range A Resolution A Accuracy 0 00 9 99 0 01 10 0 99 9 0 1 100 999 1 1 00k 9 99k 10 10 0k 23 0k 100 Consider accuracy of fault loop resistance measurement Nominal voltage ra...

Page 53: ... 3 digits 20 0 199 9 0 1 200 1999 1 5 of reading 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 500 with a fully charged battery Automatic polarity reversal of the test voltage 7 7 Voltage frequency and phase rotation 7 7 1 Phase rotation Nominal system voltage range 100 VAC 550 VAC Nominal f...

Page 54: ... classification double insulation Pollution degree 2 Protection degree IP 40 Display 128x64 dots matrix display with backlight Dimensions w h d 14 cm 8 cm 23 cm Weight 1 0 kg without battery cells Reference conditions Reference temperature range 10 C 30 C Reference humidity range 40 RH 70 RH Operation conditions Working temperature range 0 C 40 C Maximum relative humidity 95 RH 0 C 40 C non conden...

Page 55: ...3488 5 2970 8 2529 9 1354 5 250 6032 4 4399 6 3615 3 2918 2 1590 6 315 7766 8 6066 6 4985 1 4096 4 2272 9 400 10577 7 7929 1 6632 9 5450 5 2766 1 500 13619 10933 5 8825 4 7515 7 3952 7 630 19619 3 14037 4 11534 9 9310 9 4985 1 710 19712 3 17766 9 14341 3 11996 9 6423 2 800 25260 3 20059 8 16192 1 13545 1 7252 1 1000 34402 1 23555 5 19356 3 16192 1 9146 2 1250 45555 1 36152 6 29182 1 24411 6 13070 ...

Page 56: ...250 250 250 250 250 63 315 315 315 315 315 Fuse type C Disconnection time s 35m 0 1 0 2 0 4 5 Rated current A Min prospective short circuit current A 0 5 5 5 5 5 2 7 1 10 10 10 10 5 4 1 6 16 16 16 16 8 6 2 20 20 20 20 10 8 4 40 40 40 40 21 6 6 60 60 60 60 32 4 10 100 100 100 100 54 13 130 130 130 130 70 2 16 160 160 160 160 86 4 20 200 200 200 200 108 25 250 250 250 250 135 32 320 320 320 320 172 ...

Page 57: ...80 480 Fuse type D Disconnection time s 35m 0 1 0 2 0 4 5 Rated current A Min prospective short circuit current A 0 5 10 10 10 10 2 7 1 20 20 20 20 5 4 1 6 32 32 32 32 8 6 2 40 40 40 40 10 8 4 80 80 80 80 21 6 6 120 120 120 120 32 4 10 200 200 200 200 54 13 260 260 260 260 70 2 16 320 320 320 320 86 4 20 400 400 400 400 108 25 500 500 500 500 135 32 640 640 640 640 172 8 ...

Page 58: ...commander A 1270 Probe test lead 4m A 1012 Socket test Universal test cable Plug commander A 1272 Resistance box A 1195 Voltage frequency Universal test cable Tip commander A 1270 Line impedance Universal test cable Plug commander A 1272 Mains measuring cable Tip commander A 1270 Three phase adapter A 1111 Fault loop impedance Universal test cable Plug commander A 1272 Mains measuring cable Tip co...

Page 59: ...MI 3125 EurotestCOMBO Appendix B 59 ...

Page 60: ...MI 3125 EurotestCOMBO Appendix B 60 ...

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