Earth - Insulation Tester MI 2088 User Manual
Contents
1. Q Q Display range Resolution Accuracy 0 00 19 99 0 01 p Oft Oft 20 0 199 9 0 1 2 of r 3D 0 00 19 99 0 01 200 999 1 20 0 199 9 0 1 1 00k 1 99k 10 200 1999 1 2 00k 19 99k 10 Additional specification 20 0k 199 9k 0 1k 200k 999k Additional error at lowest noise current where nC a lt 8ft indication is already displayed valid at max ratio 1k Rtot Rpart 72 10 of r 10D 200k 1999k Noise current indication nC gt 2 4A approx a gt 8ft Additional error of resistance ratio Rpartial Rtotal 1 Distance between test rods 1 up to 30 mor Rpartial resistance measured with clamp 1 up to 60 ft Rtotal resistance of earthig system Indication in case of low clamp current lt 0 5 mA Voltage a c d c Automatic test of noise current yes Additional clamp error is to be considered Display range Resolution Accuracy U V V O 600 1 2 of r 2D Earth Resistance using two clamps Nominal frequency range 45 65 Hz d c Meas range RE 0 08 100 Q Display range Resolution Accuracy RE Q Q Current True RMS 0 00 19 99 0 01 10 of r 2D 20 0 100 0 0 1 20 of r Display range Resolution Accuracy Distance between test clamps gt 30 cm A A 0 0m 99 9m 0 1m 5 of r 3D Ad2. Fig 10 High Limit adjustment menu and the table of available high limit values o Use the 7 and J keys to set required High Limit Value Individual strike will increase decrease the value for one step while continuous pressure will increase decrease it continuously If test results are not to be compared with High Limit Value at all then press the CLR key no will be displayed instead of set value Press the SELECT key again after seting limit value to return to Continuity initial menu Step 3 o Compensate test leads if they have not been compensated yet or if already compensated test leads have been exchanged How to carry out the compensation Short test leads see the figure below 5 a Fig 11 Shorted test leads Press the START key and release it in order to carry out regular measurement Result close to 0 Q will be displayed Press the CAL key and release it displayed result will alter to 0 00 Q and C mark will appear indicating the compensation was successfully accomplished Test instrument is thus ready to be used o In order to annul potential compensation follow in this step described procedure at open test leads C mark will dissapear after finishing the procedure indicating the compensation has not been effected Compensation effected in this function will be considered in CONTINUITY function too MI 2088 Earth Insulation Tester Measurement instructio
3. Farth Insulation Tester Me METREL REARTH OC 4 a RE Earth Insulation Tester MI 2088 User Manual Version 1 0 Code no 20 750 325 S amp METREL Distributor Manufacturer METREL d d Ljubljanska cesta 77 1354 Horjul Slovenia web site http www metrel si e mail metrel metrel si Mark on your equipment certifies that this equipment meets the requirements of the EU European Union concerning safety and interference causing equipment regulations O 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 MI 2088 Earth Insulation Tester Table of contents 1 EPO o U ei Lo En nn a ARDE non E RE O REAR RARA RR 4 1 1 GenstakdeSCribtoncas 5 052 200202005 ne A ns sebo RAR ere naiss ta 4 12 VV AMINO EAEE he gaba EGO AR a aka a ne hy A lable e anca 5 1 3 List of parameters measurable by the Earth Insulation Tester 6 1 4 Standards apple estou cee readers totaal eed tate uaa ees teed ad odode 6 2 INSTEUMENT GESCHPTION inner ne aaa uai a aa Ara as 7 Zul MONb panel ee A teeth PR APROPRIAR DE cite RO RR 7 2 2 Connector DAME ERA nn CN thee tread te 9 2 BONO SIREN rca a Seat ne a et a chee ats 10 2 4 Standard ACCESSONIOS ss nn rene nda gas dp da 11 2 5 Oplional ACCESSOTIOS san ne a aE a ana entrent Essen 11 2 6 Ways of carrying the instrument 11 3 Meas
4. Notes o Do not use liquids based on petrol or hydrocarbons o Do not spill cleaning liquid over the instrument 46 MI 2088 Earth Insulation Tester Maintenance 5 4 Periodic calibration It is essential that all measurement instruments are regularly calibrated For occasional daily use we recommend an annual calibration to be carried out When the instrument is used continuously every day we recommend that calibration is carried out every sixth months 5 5 Service Repairs under or out of waranty time Please contact your distributor for further information Distributor s address Producer s address METREL d d Ljubljanska 77 SI 1354 Horjul Tel 386 1 75 58 200 Fax 386 1 75 49 226 E mail metrel metrel si http www metrel si Unauthorised person is not allowed to open the Earth Insulation Tester There are no user replacable components inside the instrument except the fuse refer to paragraph 5 2 Fuses 47 MI 2088 Earth Insulation Tester Technical specification 6 Technical specification 6 1 Functions Insulation Resistance Meas range Riso Un gt 250V 0 008 29 9k MQ Display range Resolution Accuracy Riso Q MQ Un gt 250V 0 000M 1 999M 0 001 2 00M 19 99M 0 01 2 of r 20 0M 199 9M__ 0 1 2D 200M 1999M 1 1 ofr 2 00G 19 99G 10 1GQ ofr 20 0G 29 9G 100 2 of r 2D Specified accuracy is valid if Universal test cable is us
5. RS 232 communication Stored results can be transfered to PC where final test protocol will be formed PC SW Earthlso Link enclosed in Standard set is needed for this operation How to transfer stored results Connect the Earth Insulation Tester to PC as shown on the figure below Fig 34 Connection of the Earth Insulation Tester to PC Instal and run PC SW Earth Link Set the Earth Insulation Tester to RS232 mode pressing the RS232 key Use the Earthlso Link commands on PC to transfer stored results from Earth Insulation Tester to PC 42 MI 2088 Earth Insulation Tester Memory and other operations 4 5 Reset of the instrument If any malfunction is noticed when dealing with the Earth Insulation Tester it is advicable RESET of the instrument to be carried out In that case all setable parameters will be set to their initial values see the table below Stored results will not be erased How to reset the instrument Switch OFF the instrument Press the CLR key and keep it pressed while switching ON the instrument rES message will be displayed for a while meaning RESET function has been completed Compensation of test leads Rt200mA Annuled Distance a between test pEARTH 1m 1ft rods High limit of RE value all REARTH functions no Test voltage R INS 500 V Low limit of RINS value R INS no High limit of Breakdown varistor TEST no voltage Low limit of Breakd
6. body with back belt only it can be simply moved from side to front position for measurement purpose and The instrument can be used even placed back again in soft carrying bag test cable connected to the instrument throught the side aperture 11 MI 2088 Earth Insulation Tester Measurement instructions 3 Measurement instructions 3 1 Insulation Resistance There are different objects where Insulation Resistance is to be measured in order to assure safety of electric installation and appliances Let s list a few examples Insulation Resistance between installation conductors L1 L2 L3 N PE all combinations Insulation Resistance of non conductive rooms walls and floors Insulation Resistance of ground cables Resistance of semiconductive antistatic floors For additional general information concerning Insulation Resistance measurement refer to enclosed handbook Measurements on electric installations in practice and theory Warnings e Make sure tested object to be deenergized mains voltage disconnected before starting the measurement e When measuring Insulation Resistance between conductors all loads must be disconnected and all switches closed e Do not touch tested object while testing it risk of electric schock e Do not connect test terminals to external voltage higher than 600 V a c or d c in order not to damage the test instrument e In case of capacitive test object capacitive c
7. 1 Storing of test results Notes o In order test result not to be influenced by connected loads tested Over voltage Device must be removed from installation before testing it o If the Over voltage Protection Device to be tested is not possible to be removed from installation permanent connection make sure to disconnect all other elements connected to installation which may influence on test result o bat message displayed during or after finishing the measurement means batteries are too weak to guarantee correct result Replace the batteries 38 MI 2088 Earth Insulation Tester Memory and other operations 4 Memory and other operations 4 1 Storing of test results All test results can be stored for later documentation purpose except Voltage and CONTINUITY measurements auxiliary functions How to store displayed test result Once test result is displayed the following procedure is to be realized Last used MEM code is offered blinking Slect MEM code where result is to be stored to MEM 1 upto 255 can be selected Store displayed result under selected MEM code Result is thus stored note down used MEM code for later recognition of stored result Main result potential subresults and potential function parameters as well as Function identification number see teh figure below are stored whenever Store procedure is effected More test results regardless of test function can be stored unde
8. Set Low Limit Insulation Resistance Value Later will test results be compared with the set limit value and if lower they will be equiped with mark How to set the Low Limit Value o Press the SELECT key after seting nominal test voltage to enter Low Limit Value adjustment menu see the figure below MI 2088 Earth Insulation Tester Measurement instructions Step MQ 0 01 ini 0 10 1 0 05 1 10 See lt pt Q Available low limit values MQ 0 00 0 10 g 10 1000 10 Last set Low limit value is blinking Fig 6 Low Limit Value adjustment menu and the table of available limit values o Use the 7 and J keys to set required Low Limit Value Individual strike will increase decrease the value for one step while continuous pressure will increase decrease it continuously If test results are not to be compared with Low Limit Value at all then press the CLR key no will be displayed instead of set value o Press the SELECT key again after seting limit value to return to Insulation Resistance initial menu Step 4 Connect test cable to tested object according to the figure below L1I o L2 e L3 o N o PEi mse s tMt rr switched off mains voltage vie Ti f See 0 Cm 225 C E o disconnec ted loads Fig 7 Connection of Split test leads left side and Tip Commander right side Step 5 Pre
9. decrease the value for one step while continuous pressure will increase decrease it continuously If test results are not to be compared with Low Limit Value at all then press the CLR key no will be displayed instead of set value e Press the SELECT key again after seting the limit values to return to Varistor Test initial menu Step 4 o Connect Split test leads to tested Varistor Over voltage Protection Device according to the figure below Fig 31 Connection of Split test leads 37 MI 2088 Earth Insulation Tester Measurement instructions Step 5 o Press the START key and release it Test voltage starts to rise 500 V s and as soon as varistor s forward current reaches the value of 1 mA Breakdown Voltage is defined at that current the voltage will be displayed Generator will stop to generate test voltage o Check the Breakdown voltage scaled to a c value called Uac presing the DISPLAY key Uac Ubreakdown main result 1 6 Meaning of the Uac voltage Protection devices intended for a c network are usually dimensioned approx 20 of nominal mains voltage above peak value of nominal mains voltage Example Nominal mains voltage Un 230V Upeak 230V 1 41 324V Ubreakdown Upeak 0 2 Un Un 1 6 368V Uac voltage may be directly compared with the voltage declared on tested protection device o Store displayed result for documentation purpose see instructions how to store itin chapter 4
10. measurement will not be carried out after pressing START key but the voltage will be displayed equiped with mark Beep warning sound will be effected too If resistance of current or potential probe is too high gt 4 k Q 100 RE or gt 50 kQ whichever is lower test result will be equiped with mark and rC or rP message If resistance of both current and potential probes is too high rCP message will be displayed If test result is out of measurement range for example open test leads then gt 999 kom a lt 8m gt 1999 kOm a gt 8m or gt 999 kOft a lt 8ft gt 1999 kOft a gt 8m message will be displayed bat message displayed during or after finishing the measurement means batteries are too weak to guarantee correct result Replace the batteries 33 MI 2088 Earth Insulation Tester Measurement instructions 3 7 Current True RMS For general information concerning the measurement refer to enclosed handbook Measurements on electric installations in practice and theory Warning Do not attach any external voltage between C1 and C2 P test terminals How to carry out the measurement Step 1 Connect current current 1000 1 test clamp to Earth Insulation Tester see the figure 27 Be aware that low range test clamp supplied by METREL can cover the range 0 5 mA up to 200 A while standard range test clamp can measure within 10 mA and 200 A o Set function switch to
11. supply the instrument approx 50 hours at the ratio measurement pause 5s 25s Notes o Insert batteries correctly otherwise test instrument will not operate and batteries may be discharged see the figure 35 for correct battery polarity o Transfer stored results to PC before removing the batteries o The results will be lost when the batteries are removed and all setable parameters will be set to their initial values after replacing the batteries see the paragraph 4 5 Reset of the instrument In order not to loose stored data follow the next procedure when replacing the batteries o Switch OFF the instrument o Replace the batteries within one minute e Switch ON the instrument Clr mem message will not be displayed indicating stored data has not been erased 5 2 Fuses There is one fuse under battery compartment cover see the figure 35 It is intended to protect internal circuitry of the test instrument if test tips are connected to mains voltage by mistake when function switch in R 200mA or CONTINUITY position Fuse type M 0 315A 250V 20 x 5 mm Check the fuse if FUS message is displayed Warning o Replace blown fuse with original one only otherwise the instrument may be damaged and or operater s safety impaired 5 3 Cleaning Use soft patch slightly moistened with soap water or alcohol to clean the surface of Earth Insulation Tester and leave the instrument to dry totally before using it
12. CURRENT clamp position the following menu will be displayed m E Fig 26 Current function initial menu Step 2 Connect test clamp to tested object according to the figure below Leakage current Phase current Fig 27 Connection of test clamp 34 MI 2088 Earth Insulation Tester Measurement instructions Step 3 o Press the START key and release it Measurement starts to run continuous measurement result is currently displayed o Press the START key again after finishing the current measurement last result will stay displayed o Store displayed result for documentation purpose see instructions how to store itin chapter 4 1 Storing of test results Note o bat message displayed during or after finishing the measurement means batteries are too weak to guarantee correct result Replace the batteries 35 MI 2088 Earth Insulation Tester Measurement instructions 3 8 Varistor Over voltage Protection Devices For general information concerning the measurement refer to enclosed handbook Measurements on electric installations in practice and theory How to carry out the Breakdown voltage measurement Step 1 o Connect Split test leads to Earth Insulation Tester o Set function switch to varistor TEST position the following menu will be displayed Fig 28 Varistor Test initial menu Step 2 o Set High Limit Breakdown Varistor Voltage Later will test results be compared wi
13. G 6 V 4 x 1 5 V IEC LR 14 Fig 3 Bottom side Legend 1 Nylon strip it serves the operater to carry the instrument hung on his neck 2 Auxiliary nylon strip it serves the operater to fix the instrument along his body 3 Plastic cover it fixes nylon strip to the instrument There is a screw under the cover left and right which is to be unscrewed when opening the instrument for service or calibration purpose Screw unscrew it to remove carrying strip or to open the instrument Label with measurement ranges Battery fuse compartment cover Screw unscrew it to replace batteries or blown fuse Rubber foot o NOAOA MI 2088 Earth Insulation Tester Instrument description 2 4 Standard accessories See attached sheet to compare received set of accessories with listed one 2 5 Optional accessories See attached sheet to check the list of available optional accessories which may be supplied upon request 2 6 Ways of carrying the instrument As the Earth Insulation Tester is equiped with two carrying belts neck and back various possibilities of carrying the instrument are available Operater can choose appropriate one on basis of his operation see the following examples The instrument is hung The instrument is hung around operator s neck around operator s neck and only quick placingand fixed to his body with back displacing belt stable position The instrument is fixed to operator s
14. arnings yes Dimensions w x h x d 26 5 x 11 x 18 5 cm Weight without accessories with batteries 1 7kg Display LCD with backlight Memories over 1000 measurements Computer connection Protection classification double insulation Over voltage chateg CATIII 300V or CATII 600 V Polution degree 2 Degree of protection eree IP 44 Working temp range 0 40 C Nominal reference temp range 10 30 C Max humidity ss 85 RH 0 40 C Nominal reference hum range 40 60 RH Auto power off yes 90
15. ation activity Warning Do not connect test terminals to external voltage higher than 600 V a c or d c in order not to damage the test instrument How to carry out the measurement Step 1 Connect test cable Split test leads or Tip Commander to Earth Insulation Tester Set function switch to RINS VOLTAGE position Insulation Resistance initial menu will be displayed see the figure 4 Step 2 o Press the DISPLAY key and release it measurement starts to run result will be currently displayed as follows Fig 8 Voltage measurement Step 4 o Connect test cable to tested terminals and follow displayed result Step 5 o Press the DISPLAY key again and release it after finishing the Voltage measurement Insulation Resistance initial menu see the figure 4 will be displayed again MI 2088 Earth Insulation Tester Measurement instructions Instead of pressing DISPLAY key it is also possible to start Insulation Resistance measurement directly pressing the START key o Store displayed result for documentation purpose see instructions how to store itin chapter 4 1 Storing of test results Notes o AC effective value or DC voltage up to 600V can be measured Polarity in case of DC voltage will not be displayed o If measured voltage is higher than 600V gt 600V message will be displayed o bat message displayed during or after finishing the measurement means batteries are too weak to guara
16. ction switch to REARTH 2 clamps position menu according to the figure 17 will be displayed Step 2 o Set High limit Earth Resistance value follow Step 2 on page 22 Value 1 up to 100 Q in steps of 1 Q can be set Step 3 o Connect test clamps to the instrument and to tested object according to the figure below fo o nd mem QE mit ooo IA T r Make sure the distance between test clamps is at least 30 cm otherwise test result a may not be correct RE Ni RE1 Fig 22 Connection of two test clamps Step 4 o Press the START key and release it The measurement starts to run continuous measurement results are currently displayed o Press the START key again after finishing the measurement last result will stay displayed o Store displayed result for documentation purpose see instructions how to store itin chapter 4 1 Storing of test results 29 MI 2088 Earth Insulation Tester Measurement instructions Notes In case of present external voltage higher than 19 V a c d c between H and E or ES and S test terminals the Earth Resistance measurement will not be carried out after pressing START key but the voltage will be displayed equiped with P mark Beep warning sound will be effected too In case of the ratio Noise current Measurement current gt 100 nC noise current message will be displayed indicating test result may not be correct The value of noise current may be also measured i
17. ditional error at lowest noise current where nC 100m 999m 1m indication is already displayed 10 of r 10D 1 00 9 99 0 01 5 of r Noise current indication nC starts to be 10 0 99 9 0 1 displayed at Inoise Isignal gt 100 100 200 1 Additional clamp error is to be considered Input resistance 100Q 1W Measurement principle current clamp 1A 1mA Specific Earth Resistance resistivity Nominal frequency 50 60 Hz All technical data listed under four lead method are valid except display range table see addapted one below Display range Resolution Accuracy p Qm Qm 0 00 19 99 0 01 20 0 199 9 0 1 200 1999 1 Consider 2 00k 19 99k 10 accuracy of RE 20 0k 199 9k 0 1k measurement 200k 999k 2naR a lt 8m Pta 1k 200k 1999k a gt 8m Additional clamp error is to be considered Varistor over voltage protection devices Breakdown voltage Display range Resolution Accuracy U v V O 1000 1 5 of r 10V Measurement principle d c voltage ramp Test voltage slope 500 V s Treshold current 1 mA 49 MI 2088 Earth Insulation Tester Technical specification 6 2 General characteristics Power supply 6 Vd c 4 x 1 5V battery IEC LR14 Automatic comparation of test result with set high and low limit value ii yes Vizual and sound w
18. ed while it is valid up to 200 MQ if Tip Commander is used Meas range Riso Un lt 250V 0 012 199 9 MQ Display range Resolution Accuracy Riso Q MQ Un lt 250V 0 000M 1 999M 0 001 2 00M 19 99M 0 01 5 of r 20 0M 199 9M 0 1 SD Display range Resolution Test voltage V V 0 1200 1 Accuracy 2 of r 3D Nom test voltage 50 1000Vd c in steps of 10 V Current capability of test generator at Ut st S UN ovine tannins gt imA Short circuit test current lt 3 mA Automatic discharge of tested object yes Continuity of protection conductors Meas range R ecrccccccrccecenee 0 08 1999 Q Display range Resolution Accuracy R 9 Q 0 00 19 99 0 01 2 of r 2D 20 0 199 9 0 1 3 of r 200 1999 1 Open terminal test voltage 4 7 Vd c Short circuit test current gt 200 mA Compensation of test leads up to 5 9 yes Soundisignal a kan a Ls en En Reine yes Automatic polarity exchange yes Measurement mode single measurement Continuity Display range Resolution R 9 9 Accuracy 0 0 199 9 0 1 3 of r 3D 200 1999 1 Open terminal test voltage 4 7 Vd c Short circ
19. f test result is out of measurement range open test leads gt 1999 Q message will be displayed bat message displayed during or after finishing the measurement means batteries are too weak to guarantee correct result Replace the batteries 21 MI 2088 Earth Insulation Tester Measurement instructions 3 4 Continuity The function is intended to be used especially when arranging terminal to terminal connections mentaining and reparing electric equipment carrying out auxiliary measurements etc The function operates continuously and serves as ordinary Q meter with low test current For additional general information concerning Continuity measurement refer to enclosed handbook Measurements on electric installations in practice and theory Warning e If test tips are connected to mains voltage during the measurement is running fuse M 0 315 A 250 V mounted in vertikal plastic cilinder under battery cover will blow see the chapter 5 2 Fuses How to carry out the measurement Step 1 o Connect test cable Split test leads or Tip Commander to Earth Insulation Tester o Set function switch to CONTINUITY position the following menu will be displayed O e Resistance of test leads has been compensated in R 200mA function Fig 14 Continuity initial menu Step 2 o Press the START key and release it Measurement starts to run continuous measurement results are currently displayed Step 3 Connec
20. ial menu Step 2 o Set distance a between test rods The distance must be equal to the one used in practical measurement otherwise test result will not be correct How to set the distance Press the SELECT key to enter Distance Value adjustment mode the following menu will be displayed 31 MI 2088 Earth Insulation Tester Measurement instructions Last set distance a is blinking Available Step distances m ft m it Fig 24 Distance value adjustment menu o Use the 7 and J keys to set appropriate Distance a Individual strike will increase decrease the value for one step while continuous pressure will increase decrease it continuously o Press the SELECT key after seting the distance value to return to Earth Resistivity initial menu Step 3 Connect test leads to the instrument and to test rods according to the figure below a 20 max Y Fig 25 Connection of standard 20 m long test leads Step 4 Press the START key and keep it pressed until result is stabilized then release the key Last result will stay displayed Store displayed result for documentation purpose see instructions how to store it in chapter 4 1 Storing of test results 32 MI 2088 Earth Insulation Tester Measurement instructions Notes In case of present external voltage higher than 19 V a c d c between H and E or ES and S test terminals the Earth Resistivity
21. imit Earth Resistance Value follow Step 2 on page 22 Value 1 up to 100 Q in steps of 1 Q can be set Step 3 o Connect test leads and Low range test clamp to the instrument and to tested object according to the figure below Fig 21 Connection of standard 20 m long test leads and clamp 19 Make sure to connect test clamp under the E test terminal otherwise parallel resistance of all other electrodes RE1 up to RE3 will be measured Step 4 o Press the START key and keep it pressed until result is stabilized then release the key Last result will stay displayed 27 MI 2088 Earth Insulation Tester Measurement instructions o Check resistances of current and potential probe pressing the DISPLAY key rP and then value of potential probe will be displayed automatically followed by rC and then value of current probe After a while main result will automatically be displayed again o Store displayed result for documentation purpose see instructions how to store itin chapter 4 1 Storing of test results Notes o In case of present external voltage higher than 19 V a c d c between H and E or ES and S test terminals the Earth Resistance measurement will not be carried out after pressing START key but the voltage will be displayed equiped with P mark Beep warning sound will be effected too o If resistance of current or potential probe is too high gt 4 k Q 100 RE or gt 50 kQ whichever is lower test
22. n CURRENT function If test result is out of measurement range open test leads gt 99 9 message will be displayed If the current measured with clamp is lower than 0 5 mA LC low current message will be displayed indicating test result may not be correct bat message displayed during or after finishing the measurement means batteries are too weak to guarantee correct result Replace the batteries 30 MI 2088 Earth Insulation Tester Measurement instructions 3 6 Specific Earth Resistance It is advisable to measure Earth Resistivity when defining parameters of earthing system required length and surface of earth electrodes most appropriate depth of installing earthing system etc in order to reach more accurate calculations For additional general information concerning Earth Resistivity measurement refer to enclosed handbook Measurements on electric installations in practice and theory Different units are used for Earth Resistivity parameter namely o Qm European countries o Oft The United States That is why the Earth Insulation Tester offers both units as well as both units for inserted distance a m ft between test rods See the procedure how to select appropriate unit on page 40 How to carry out the measurement Step 1 o Set function switch to p EARTH position the following menu will will be displayed a Set distance between test rods Fig 23 Earth Resistivity init
23. n switch Description position Earth Resistance RE REARTH Four test terminals classic four lead method Two test rods Partial Earth Resistance RE REARTH Four test terminals classic four lead method plus clamp Two test rods test clamp One test clamp Earth Resistance RE REARTH Two test clamps two test clamps 2 clamps Earth Resistivity p pEARTH Four test terminals Four test rods Continuity R of protection Test current gt 200 mA d c conductors R 200mA Single measurement Auto polarity reverse Continuity Rx CONTINUITY Test current lt 7 mA Continuous measurement Insulation Resistance Ri RINS VOLTAGE Test voltage 50 1000 V Voltage RINS VOLTAGE AC or DC voltage 0 600 V Varistor Over voltage Device varistor Test Rising test voltage Breakdown Voltage Ub 0 1000 V Treshold current 1 mA Low range Current CURRENT Test clamp Load Current CURRENT Test clamp 1 4 Standards applied Earth Insulation Tester is designed according to European safety standard e EN61010 1 EMC noise and immunity according to European standards EN 50081 1 EN 50082 1 Measurements according to European standard EN 61557 e Insulation Resistance Part 2 Resistance of Earth connection and Equipotential bonding e Earth Resistance Part 5 Part 4 Instrument description MI 2088 Earth Insulation Tester 2 Instrument description 2 1 Front panel Fig 1 F
24. ns Step 4 Connect test leads to tested object according to the figures below MPEC Main Potential Equalizing Collector PCC x Protection Conductor Collector Doo jo oo Fig 12 Connection of Split test leads and extra test lead lt lt e ms Fig 13 Connection of Tip Commander and extra test lead Step 5 Press the START key and release it Measurement will be carried out and result displayed afterwards Each measurement is accomplished in two steps polarity is reversed between the two steps automatically Higher partial result will be displayed The result will be equiped with beep sound signal if lower than set High limit value Check lover partial result pressing the DISPLAY key Store displayed result for documentation purpose see instructions how to store itin chapter 4 1 Storing of test results 20 MI 2088 Earth Insulation Tester Measurement instructions Notes In case of present external voltage higher than 9 V a c d c between test terminals the Continuity measurement will not be carried out after pressing START key but the voltage will be displayed equiped with mark Beep warning sound will be effected too If resistance value higher than 5 Q measured with not compensated instrument is displayed compensation will not be carried out after pressing CAL key even more already effected compensation will be annuled C mark will disappear I
25. nt menu and the table of available limit values See explanation for above listed available limit values in enclosed handbook Measurements on electric installations in practice and theory under paragraph 5 7 4 Earth Resistance external test voltage o Use the 7 and keys to set required High Limit Value Individual strike will increase decrease the value for one step while continuous pressure will increase decrease it continuously If test results are not to be compared with High Limit Value at all then press the CLR key no will be displayed instead of set value o Press the SELECT key again after seting limit value to return to Earth Resistance initial menu Step 3 o Connect test leads to the instrument and to tested object according to the figures below ay NX gt 5d d Fig 19 Connection of standard 20 m long test leads 25 MI 2088 Earth Insulation Tester Measurement instructions Ste ERE Fig 20 Connection of optional 50 m long test leads p4 Press the START key and keep it pressed until result is stabilized then release the key Last result will stay displayed Check resistances of current and potential test rod pressing the DISPLAY key rP and then value of potential probe will be displayed automatically followed by rC and then value of current probe After a while main result will automatically be displayed again Store displayed result for documentation purpose see instructions ho
26. ntee correct result Replace the batteries MI 2088 Earth Insulation Tester Measurement instructions 3 3 Continuity of Protection Conductors Continuity of protection conductors is to be measured before mains voltage is connected to tested installation new or adapted installations Max allowed resistance value depends on the power of connected loads used installation system TN TT etc For additional general information concerning Continuity measurement refer to enclosed handbook Measurements on electric installations in practice and theory Warning o Make sure tested object to be deenergized mains voltage disconnected before starting the measurement How to carry out the measurement Step 1 o Connect test cable Split test leads or Tip Commander to Earth Insulation Tester o Set function switch to R 200mA position the following menu will be displayed Cy santa Resistance of test leads has been compensated Fig 9 Continuity initial menu Step 2 o Set High Limit Resistance Value Later will test results be compared with the set limit value and if higher they will be equiped with mark How to set the High Limit Value o Press the SELECT key to enter High Limit adjustment menu see the figure below MI 2088 Earth Insulation Tester Measurement instructions as Last set High Limit Value is blinking Q Available high limit Step BIA values Q 92 0 0 20 0 0 1
27. o blink Select appropriate unit using the T or key o Press the SELECT key again to abandom Frequency and Unit selection menu the instrument is ready for regular measurements New selection is also offered after each reseting of the instrument see the procedure in chapter 4 5 Reset of the instrument 44 MI 2088 Earth Insulation Tester Maintenance 5 Maintenance 5 1 Batteries A Disconnect test cable and switch off the instrument before removing battery compartment cover Hazardous voltage under the battery compartment cover Battery condition is currently displayed see the battery condition mark in the left upper corner of display Fully dark battery mark presents full capacity batteries Follow the battery condition even during carrying out measurements Results obtained with low battery voltage the results may be incorrect will be marked with bat mark after finishing the measurement Replace all four batteries when the battery mark is empty in static mode no measurement is running or when the battery mark trips to empty frame just temporarily while a measurement is running Nominal power supply voltage is 6 Vd c Use four 1 5 V alkaline batteries type IEC LR14 dimensins diameter 26 mm hight 50 mm Fuse M 0 315 A 250 V 20 x 5 mm Fig 35 Correct polarity of inserted batteries 45 MI 2088 Earth Insulation Tester Maintenance One set of full capacity batteries can
28. ompensation of reactive power long tested cable etc automatic discharge of the object may not be done immediatelly after finishing the measurement Falling voltage will be displayed in that case do not disconnect test leads until the voltage drops below 50V How to carry out the measurement Step 1 o Connect test cable Split test leads or Tip Commander to Earth Insulation Tester o Set function switch to RINS VOLTAGE position the following menu will be displayed 12 MI 2088 Earth Insulation Tester Measurement instructions UNE Last set nominal test voltage Actual test voltage U is displayed during the a UN 150v measurement Fig 4 Insulation Resistance initial menu Step 2 o Set Nominal Test Voltage How to set the Test Voltage o Press the SELECT key and release it to enter Test voltage adjustment mode the following menu will be displayed Last set Nominal test voltage is blinking Available nominal Step ES MAL test voltages V V 50 1000 10 Fig 5 Test voltage adjustment menu and the table of available nominal test voltages o Use the 7 and J keys to set required nominal test voltage Individual strike will increase decrease the voltage for one step while continuous pressure will increase decrease it continuously the value will stop for a while when reaching standard value like 100 250 or 500 V enabling the operater to depress used key Step 3 o
29. own varistor TEST no voltage High limit R value R 200mA no Table 1 Initial values of setable parameters Note o After performing reset function CLR key the instrument will automatically enter Frequency and Unit selection procedure see the next page 43 MI 2088 Earth Insulation Tester Memory and other operations 4 6 General setings Usually there are noise voltages currents present on measured objects caused by mains voltage somewhere in near or far neighbourhood Mains voltage frequency is different in different countries 50 Hz in European countries etc 60 Hz in the United States etc In order test results to be stabile and correct regardless of present noise itis necessary to insert nominal frequency of mains system On basis of set frequency will the Earth Insulation Tester automatically adjust integrating timing in order to reach high immunity against mains noise The frequency once set will stay set even after replacing batteries How to insert the frequency of mains voltage 50 60 Hz and the unit of Specific Earth Resistance parameter Qm Oft o Switch OFF the instrument o Press the SELECT key and keep it pressed while switching ON the instrument until 50 or 60 value last selected starts to blink Select appropriate frequency of mains voltage using the T or key e Press the SELECT key unit m or ft last selected used in Earth Resistivity measurement starts t
30. r the same MEM code This will be done simply effecting double click to SAVE key Function identification numbers Fig 32 Function identification numbers Notes Each result can be stored only once FUL message will be displayed in case all memory locations are occupied 39 MI 2088 Earth Insulation Tester Memory and other operations 4 2 Recalling of stored results Stored results can be displayed whenever needed for visual check Main result potential subresult and potential function parameter can be recalled How to recall stored results MEM code will be offered blinking Function identification RCL number of last result stored under offered MEM code will be displayed Set MEM code Function identification number will follow set MEM code currently MEM code will stop blinking Check main result subresult and function parameter hidden behind displayed Function identification number Move to other test results stored under the same MEM code Function identification number must be displayed set by DISPLAY key before using the T and J keys DISPLAY behind displayed Function identification number MEM code starts blinking again repeat the whole procedure to SELECT recall results stored under other MEM codes Check main result subresult and function parameter hidden If there is no stored result at all no message will be displayed for a while after pressing RCL key If there is no
31. rement using three different methods The appropriate one is to be selected by the operater on basis of concrete earthing system to be tested Main advantages of Internal generator system against external mains test voltage one are o Test instrument operates autonomously regardless of present or not present mains voltage o Partial Earth Resistances can be measured using test clamp without mechanical disconnection of tested electrode o Probeless measurement can be done using two test clamps For additional general information concerning Earth Resistance measurement refer to enclosed handbook Measurements on electric installations in practice and theory How to carry out Earth Resistance measurement using standard four lead test method Step 1 o Set function switch to REARTH position the following menu will be displayed Fig 17 Earth Resistance initial menu Step 2 o Set High Limit Earth Resistance Value Later will test results be compared with the set limit value and if higher they will be equiped with mark How to set the High Limit Value 24 MI 2088 Earth Insulation Tester Measurement instructions o Press the SELECT key to enter High Limit Value adjustment mode the following menu will be displayed Available High Step limit values Q Q 1 100 1 AE 166 250 500 833 1666 E 2500 5000 Last set High limit value is blinking Fig 18 Limit adjustme
32. result will be equiped with mark and rC or rP message If resistance of both current and potential probes is too high rCP message will be displayed o If test result is out of measurement range open test leads gt 1 99 kQ message will be displayed o If the current measured with clamp is lower than 0 5 mA LC low current message will be displayed indicating test result may not be correct the result is still correct if Rtot Rpart lt 100 Where RIDE scott Total Earth Resistance measured when function switch is in REARTH position Rpa tsssi Partial Earth Resistance measured with clamp when function switch is in REARTH clamp position o In case of present noise current higher than approx 2 4 A in clamp loop nC noise current message will be displayed indicating test result may not be correct The value of noise current may be also measured in CURRENT function o bat message displayed during or after finishing the measurement means batteries are too weak to guarantee correct result Replace the batteries 28 MI 2088 Earth Insulation Tester Measurement instructions How to carry out Earth Resistance measurement using two test clamps For detailed general instruction concerning this type of measuremens refer to enclosed handbook Measurements on electric installations in practice and theory High acquintance is required to measure Earth resistance this way correctly Step 1 o Set fun
33. roduction 1 Introduction Congratulations on your purchase of the Earth Insulation Tester and its accessories produced by METREL d d We are glad to be able to offer high professional test equipment for carrying out absolute measurement of Earth Resistances and Insulation Resistances on installations in buildings The equipment was designed and produced on basis of rich experiences acquired through more years long period of dealing with Earth Resistance and Electric installation test equipment 1 1 General description The Earth Insulation Tester is high professional multifunctional portable test instrument It is intended for carrying out Earth Resistance Insulation Resistance and Continuity of Protection Conductors measurements according to European standard EN 61557 It can also do various other tests and measurements The instrument is equiped with all accessories necessary for comfortable carrying out the tests It is kept in a soft carrying bag separated from enclosed accessories Electronic part of the Earth Insulation Tester is produced in SMD technology which demands practically no service interventions Custom designed LCD display with backlight offers easy to read main results as well as a wide range of subresults parameters and messages Operatio is simple and clear operater does not need to attend any special training except to read this Instruction Manual to operate the instrument In order the operater
34. ront panel MI 2088 Earth Insulation Tester Instrument description Legend 1 ON OFF key to switch ON or OFF the instrument Auto OFF will occure automatically 10 minutes after last strike to any key or function switch rotation RS 232 key to communicate with PC LAMP key to turn ON or OFF display backlight The backlight once switched ON will switch OFF automatically 20 seconds after last strike to any key or function switch rotation RCL key to recall stored results SAVE key to store test results START key to start any measurement except Voltage automatic start CLR key to erase stored results DISPLAY key to e Check current and potential probe resistances rC and rP in p EARTH R EARTH and R EARTH one clamp functions e Switch between Voltage and Insulation Resistance measurement when function switch in RINS VOLTAGE position e Check Uac voltage in Varistor test function e Check lower partial result in R 200mA function 9 LCD with backlight 10 Function switch to select appropriate parameter to be tested 11 Belt slot to fix carrying belt 12 CAL key to compensate resistance of test leads in R 200mA function 13 J key to decrease setable parameter value 14 7 key to increase setable parameter value 15 SELECT key to select set function parameters as follows e Earth resistivity function Distance a between test rods e Earth Resistance functions High limit value of test result e Insulation Resistance func
35. ss the START key and keep it pressed until result is stabilized then release the key Last result will stay displayed o Store displayed result for documentation purpose see instructions how to store itin chapter 4 1 Storing of test results 14 switches 9 9 4 MI 2088 Earth Insulation Tester Measurement instructions Notes In case of present external voltage higher than 30 V a c d c between test terminals the Insulation Resistance measurement will not be carried out after pressing START key but the voltage will be displayed equiped with mark Beep warning sound will be effected too Tested object is discharged automatically after finishing the measurement actual voltage is displayed during discharging until the voltage drops below 30 V If test result is out of measurement range open test leads or good isolation gt 29 9 GQ message will be displayed UN gt 250 V or gt 200 MQ UN lt 250 V Positive pole of test voltage is attached to red test lead Split test leads or to commander test tip Tip Commander bat message displayed during or after finishing the measurement means batteries are too weak to guarantee correct result Replace the batteries MI 2088 Earth Insulation Tester Measurement instructions 3 2 Voltage Voltage measurement is common function often often for example when locating installation faults or as a safety measure before starting any installation adapt
36. stored result under set MEM code no message will be displayed for a while whenever the code is changed Organisation of memory locations under a certain MEM code is presented on the figure below 40 MI 2088 Earth Insulation Tester Memory and other operations DISPLAY q N 3 i Example Earth Resistance Two clamp method _3 DISPLAY AV PORAI E T N 2 Example Continuity of Protection 23 Conductors 3 DISPLAY AV PBR se N 1 nu E Example Insulation Resistance _5 DISPLAY AV DISPLAY q E no aaa Example Specific Earth Resistance _3 DISPLAY Fig 33 Organisation of memory locations 41 MI 2088 Earth Insulation Tester Memory and other operations 4 3 Erasing of stored results Two modes of erasing stored results are available namely All stored results can be erased in one step A certain stored result only can be erased How to erase all stored results Press the CLR key Clr ALL MEM message starts to blink Confirm erasing pressing the CLR key again all stored results will be erased How to erase only a certain stored result Recall a certain result to be erased following the procedure described in paragraph 4 2 Recalling of stored results Press the CLR key Clr MEM message starts to blink Confirm erasing pressing the CLR key again Only result displayed before CLR key was pressed will be erased The procedure may be repeated in order to erase other stored results too 4 4
37. t test leads to tested object according to the figures below and follow displayed result or sound information result is accompanied with sound signal if displayed value is lower than 209 22 mai MI 2088 Earth Insulation Tester Measurement instructions if Fig 16 Connection of Tip Commander Press the START key again after finishing the measurement last result will stay displayed Store displayed result for documentation purpose see instructions how to store itin chapter 4 1 Storing of test results Notes In case of present external voltage higher than 9 V a c d c between test terminals the Continuity measurement will not start after pressing START key but the voltage will be displayed equiped with mark Beep warning sound will be effected too If test result is out of measurement range open test leads gt 1999 message will be displayed Positive pole of test voltage is attached to red test lead Split test leads or to commander test tip Tip Commander Compensation of test leads effected in R 200mA function will be considered in this function too bat message displayed during or after finishing the measurement means batteries are too weak to guarantee correct result Replace the batteries 23 MI 2088 Earth Insulation Tester Measurement instructions 3 5 Earth Resistance internal generator The Earth Insulation Tester is able to carry out Earth Resistance measu
38. th the set limit value and if higher they will be equiped with mark How to set the High Limit Value o Press the SELECT key to enter High Limit Value adjustment mode the following menu will appear N Last set High limit value is blinking lt nr ce Available Step a El values V V a O 1000 10 Fig 29 High limit value adjustment menu and the table of available limit values 36 MI 2088 Earth Insulation Tester Measurement instructions o Use the 7 and J keys to set required High Limit Value Individual strike will increase decrease the value for one step while continuous pressure will increase decrease it continuously If test results are not to be compared with High Limit Value at all then press the CLR key no will be displayed instead of set value Step 3 o Set Low Limit Breakdown Varistor Voltage Later will test results be compared with the set limit value and if lower they will be equiped with mark How to set the Low Limit Value o Press the SELECT after seting the High Limit Value to enter Low Limit Value adjustment mode the following menu will be displayed Last set Low limit value is blinking Available Step values V V TNT RE 0 1000 10 g Fig 30 Low limit value adjustment menu and the table of available limit values e Use the and J keys to set required Low Limit Value Individual strike will increase
39. tion Nominal test voltage and Low limit value of test result e Varistor Breakdown voltage function Low and High limit value of test result e Continuity of Protection Conductors function R 200mA High limit value of test result e General setings Immunity against mains noise signal nominal mains frequency 50 Hz 60 Hz is to be inserted and Earth resistivity unit Qm or Ot D o NOAA MI 2088 Earth Insulation Tester Instrument description 2 2 Connector panel e Use original test cables only e Max allowed voltage between main test terminals and ground is 300V e Max allowed voltage between main test terminals is 600V e Max allowed voltage between main test terminals and C1 C2 P test terminals is 300V e Max continuous current to C1 C2 P test terminals is 0 3A Do not attach any external voltage between these two terminals Uallowed OV Fig 2 Connector panel Legend 1 Main test connector 2 RS 232 connector to connect Earth Insulation Tester to PC 3 Clamp C1 test terminal 4 Clamp C2 P test terminal MI 2088 Earth Insulation Tester Instrument description 2 3 Bottom side DISCONNECT ALL TEST LEADS AND SWITCH OFF INSTRUMENT BEFORE REMOVING THE BATTERY FUSE COVER HAZARDOUS VOLTAGE POWER SUPPLY 6 V 4 x 1 5 V IEC LR 14 VOR PA a DES BATTERIE SICHERUNGSFACH ALLE ZULEITUNGEN ITFERNEN UND DAS GERAT AUSSCHALTEN ERAT EN SEPAHRUCHE SPANNUNG STROMVERSORGUN
40. to be familiar enough with measurements covered by the Earth Insulation Tester purpose of each measurement measurement principle limit values etc it is advisable to read the enclosed handbook Measurements on electric installations in theory and practice Professional PC SW enables simple transfer of test results and other parameters to PC as well as simple and quick forming of final protocols MI 2088 Earth Insulation Tester Introduction 1 2 Warnings In order to reach high operater s safety while carrying out various measurements and tests using the Earth Insulation Tester as well as to keep the test equipment undamaged it is necessary to consider the following general warnings If the test equipment is used in manner not specified in this Instruction Manual the protection provided by the equipment may be impaired Do not use the instrument and accessories if any damage is noticed In case of blown fuse follow the instructions in this Instruction Manual to replace it Service intervention or calibration procedure is allowed to be carried out only by a competent authorized person Consider all generally known precautions in order to avoid risk of electric shock while dealing with hazardous voltages Use only standard or optional test cables supplied by your dealer MI 2088 Earth Insulation Tester Introduction 1 3 List of parameters measurable by the Earth Insulation Tester Parameter Functio
41. uit test current lt 7 mA Sound signal R gt 20Q seses yes Measurement mode continuous measurement Earth Resistance four lead method Meas range RE seenen 0 11 19 99k Q Display range Resolution Accuracy Q Q 0 00 19 99 0 01 20 0 199 9 0 1 2 of r 3D 200 999 1 1 000 1 999 1 2 00k 19 99k 10 5 ofr Additional spike resistance error at Rc max or Rp max 3 of r 10D REMAX eet anse aa 4kQ 100RE or 50kQ whichever is lower RO Max 22555 tite mentir 4kQ 100RE or 50kQ whichever is lower Additional error at 10 V voltage noise 50 Hz 5 of r 10D Open terminal test voltage 40 Va c Test voltage shape sine wave Test voltage frequency 125 150 Hz Short circuit test current lt 20 mA Automatic test of current and potential test probe resistance yes Automatic test of voltage noise yes Earth Resistance using one clamp in combination with four lead method All technical data listed under four lead method are valid except display and meas ranges see adapted ones below Meas range RE ee 0 11 1 99k Q Display range Resolution Accuracy 48 MI 2088 Earth Insulation Tester Technical specification
42. urement instructions nnnernennnnnnneennenennes 12 3 1 INSUAIONR SIS RANCE SRE RS A net cate aes 12 Se VOO RER PEO ee RR a Ta Ee nr ROT eee 16 3 3 Continuity of Protection Conductors erra 18 924 CONNU Se en cr ice RO Co nodos Bei reu Rea bad 22 3 6 Specific Earth Resistance assaut quote dado ieee ened fe nette 31 Sars C rrent Trus RMS ES So near sient SAR nest nu As 34 3 8 Varistor Over voltage Protection Devices 36 4 Memory and other operations 39 Ato Storing ORIGSEMOSUING inene nr Ant en ada Lares E 39 4 2 Recalling of stored results unicas as ias o quina asa cbs eee aiden a eee ee teen tee 40 4 3 Erasing of stored TeSuitS cars acasos aA Nan Aer Aaa 42 4 4 RS 232 communication a RE edt he ich i tei Sle hed RS 42 4 5 Reset of the instrument xa Ses ne nee den entend tee niet eee 43 46 General SCUNOS nair a E ee NN En on rss 44 D MAT NANCE soient tement a eut a nn toan rot den Mantes entente ci aura oia lt be tuile 45 Dat 2 LUS AS SP nica radi E A 45 LOVING IU Eos lt 1 pO eR RMT eR a aa E 46 53 Cleaning ee eee eee me eee ee ee ee ee re ae ee ee ere eee 46 DA Penodie CANDPANONE EEE ne ne en Ne On Ne te tete 47 abc ADVICE EE O a ae inal vtec ta 47 6 Technical SPECICATION ssh naine tentant bd id 48 Gil PUNGIONS esne e a a oo a ara GvandianmancaahssunsesDecatecavecias 48 6 2 General characteristics 2 2552 uiestenhusss natale ein ni lient fs 50 MI 2088 Earth Insulation Tester Int
43. w to store itin chapter 4 1 Storing of test results Notes In case of present external voltage higher than 19 V a c d c between H and E or ES and S test terminals the Earth Resistance measurement will not be carried out after pressing START key but the voltage will be displayed equiped with I mark Beep warning sound will be effected too If resistance of current or potential rod is too high gt 4 k Q 100 RE or gt 50 kQ whichever is lower test result will be equiped with mark and rC or rP message If resistance of both current and potential probes is too high rCP message will be displayed If test result is out of measurement range open test leads gt 19 99 kQ message will be displayed bat message displayed during or after finishing the measurement means batteries are too weak to guarantee correct result Replace the batteries 26 MI 2088 Earth Insulation Tester Measurement instructions How to carry out Earth Resistance measurement partial resistance using standard four lead test method in combination with test clamp For detailed general instruction concerning this type of measuremens refer to enclosed handbook Measurements on electric installations in practice and theory High acquintance is required to measure Earth resistance this way correctly Step 1 o Set function switch to REARTH clamp position menu according to the figure 17 will be displayed Step 2 o Set High L
Download Pdf Manuals
Related Search