Home

Megger DET3TC User Guide

1. I c F ET Potential stake y4 Vg Electrode under test DET3TC 128Hz Potential stake Electrode under test DET4TC2 DETATCR2 Set the rotary selector switch to the position The ground noise voltage reading will be displayed as shown in Figure 10 Figure 10 example ground noise voltage reading DET4 display shown www actoolsupply com 30 www actoolsupply com Note B The instrument will display the warning triangle and an excessive noise voltage indicator above 40 V pk pk 14 Vrms B The instrument will display the warning triangle and an over range condition above 100 V Measurement of ground noise voltage DET3TA 1 Ensure the rotary selector switch is in the OFF position 2 Connect the instrument as shown in Figure 11 Figure 11 instrument connection for measuring ground noise voltage Potential stake V4 Wg Electrode under test oF Set the rotary selector switch to the V position 4 The ground noise voltage reading will be indicated on the scaleplate as shown in Figure 12 Figure 12 example ground noise voltage reading 100 www actoolsupply com 31 www actoolsupply com Two terminal resistance measurement DET3TC DET3TD DET4TD2 DET4TR2 DET4TC2 and DET4TCR2 1 Ensure the rotary selector switch is in the OFF position PA Connect the instrument as shown in Figure 13 Figure 13 instrument connection for measuring two terminal r
2. instrument will auto power down LI C O C O L 3 L 3 Battery status indication DET4TR2 and DET4TCR2 The battery condition indicator is displayed whilst the instrument is switched on as shown Full battery charge shown immediately after charging LL Enna mE PEE mmm Nearly fully battery charge LI L 3 L 3 L 3 P d Some change remaining but instrument may auto power down at any time LIL EI L 3 Cc a ral 19 www actoolsupply com www actoolsupply com pe AK 0 battery charge remaining instrument will auto power BA down Note If the DET4TR2 and DET4TCR2 s rechargeable batteries are replaced with alkaline batteries the instrument may automatically disable its charging circuit to prevent inadvertent charging of non rechargeable cells Follow the instructions Re enabling the DET4TR2 and DET4TCR2 charger circuit to switch the charger back on when the NiMH cells are re inserted Battery status indication DET3TA 1 Set the rotary selector switch to the L Hh position 2 Press and hold the BIS button 3 The battery charge level will be indicated on the scaleplate as shown in Figure 1 Figure 1 battery charge level indicator 25 10 100 4 Release the MESE button Battery charging DETATR2 and DETATCR2 When the battery status indicator shows a nearly
3. 13 www actoolsupply com www actoolsupply com DET3TD Test lead connections at LCD display rear Megger DET3TD Resistance measurement settings 2P and 3P Selector switch IN Voltage measurement settings EN 25 V 50 V output voltage select button Test button Output voltage Ruptured fuse Warning refer to indicator indicator user manual Battery charge kOe 7 range V X b Ground noise voltage indicator OK high under Potential B Current probe resistance range E OK or high indicator Resistance indicator OK or high MAX 100V CAT IV i l r Test lead connections at rear of instrument 14 www actoolsupply com www actoolsupply com DET4TD2 LCD display Test lead connections at rear Resistance measurement settings 2P 3P and 4P Megger DETATO2 Selector switch Voltage measurement Test button 25 V 50 V output settings voltage select button Output voltage Ruptured fuse Warning refer to Battery charge indicator aaa UT 90V Ces Vee ees MA Rp R v V v range indicator p quA um Liz Measuring range kQ Potential probe Current probe Ground noise voltage resistance indicator resistance OK or indicator OK high OK or high high f E Ka MAX y 100V N A b CA T IV Y CHEN C e I ee 72 fxh Test lead connections at rear of instrument 15 www
4. Figure 35 instrument connection for two clamp stakeless measurement 2 EX E3 A AN 128Hz Ju Y Ve scone QE JA ici AMP A CLAMP 74 Electrode DET4TC2 under test DET4TCR2 2 Close the ICLAMP around the conductor under test Ensure the arrow on the side of the jaw is pointing in the same direction as the arrow on the VCLAMP 4 Close the VCLAMP around the conductor under test Ensure the arrow on the side of the jaw is pointing in the same direction as the arrow on the ICLAMP 5 Ensure a minimum separation of 100mm between the ICLAMP and VCLAMP 6 Set the rotary selector switch to the LE oom ve DET4TC2 and DET4TCR2 only Select the desired test frequency using the Hz button 8 Press and release the MERI button by holding the Wi button the resistance measurement will be continually updated 9 The instrument will perform pre measurement checks the status of which will be indicated on the display 10 The stakeless resistance reading will be displayed as shown in Figure 36 54 www actoolsupply com 11 www actoolsupply com Figure 36 example resistance reading using two clamp stakeless method This means that interference has been detected which may impair the accuracy of the measurement In particular the reading could be lower than the actual resistance The resistance of the electrode or system must be verified by an alternative method Note The instrument will display the warning triangle above 2
5. A no Stakeless testing is possible under this condition The instrument will display the warning triangle and an over range condition above 20 A no Stakeless testing is possible under this condition Ensure that the VCLAMP and ICLAMP jaw mating surfaces are free of dust and contamination and that they contact completely when the VCLAMP and ICLAMP are closed Currents carried by conductors in close proximity to the VCLAMP and ICLAMP may affect calibration and reduce the accuracy of measurements made If the VCLAMP opens at any time after the MI button is pressed the test will be aborted 55 www actoolsupply com www actoolsupply com ICLAMP calibration DET3TC DET4TC2 and DET4TCR2 The ICLAMP should be calibrated once at each test site to take into account the effects of transportation temperature and humidity on the ICLAMP L Ensure the rotary selector switch is in the OFF position 2 Connect the instrument as shown in Figure 27 5 Ensure that the ICLAMP is not clamped around a conductor 4 Press and hold the MSS button and switch instrument ON to the A setting using the selector switch gt Release the MES button Figure 37 ICLAMP zero calibration N DET4TC2 DET4TCR2 ICLAMP DET3TC 6 Press and hold the TEST button until a 0 reading is obtained on the display 7 Connect the 9 and terminals together using the calibration lead supplied with the ICLAMP IR and terminals for
6. CAT III Current rating 1200 A for 20 minutes Ingress protection IP40 Safety EN61010 2 032 EMC EN 50081 1 Class B EN 50082 2 Dimensions 111 mm x 216 mm x 45 mm 4 4 in x 8 5 in x 1 8 in Weight 0 5 kg approximately 1 2Ib VCLAMP SPECIFICATIONS Insulation Double insulation Voltage rating 600V CAT III Current rating 1200A for 20 minutes Ingress protection IP40 Operating temperature 10 C to 50 C 14 F to 122 F 0 to 85 RH at 35 C 95 F Storage temperature 20 C to 70 C 4 F to 158 F Jaw opening 57mm maximum 2 3in Maximum conductor size 52mm 2 1lin Electrical safety EN61010 2 032 EMC EN 50081 1 Class B EN 50082 2 Dimensions 111mm x 216mm x 45mm 4 4in x 8 5in x 1 8in Weight 0 5 kg approximately 1 2 Ib www actoolsupply com 62 www actoolsupply com CALIBRATION ADAPTOR ELECTRICAL SPECIFICATION Value 25 Q 0 1 MECHANICAL SPECIFICATION Operating temperature 10 C to 50 C 14 F to 122 F 0 to 85 RH at 35 C 95 F Storage temperature 20 C to 70 C 4 F to 158 F Dimensions 60mm x 55mm x 25mm 2 5in x 2 25in x lin Weight 0 1 kg approximately 0 2 Ib TWO CLAMP CALIBRATION ADAPTOR ELECTRICAL SPECIFICATION Value 25 Q 1 MECHANICAL SPECIFICATION Operating temperature 10 C to 50 C 14 F to 122 F 0 to 85 RH at 35 C 95 F Storage temperature 20 C to 70 C 4 F to 158 F Dimensions 111mm x 216mm x 45m
7. Current stake In this configuration the injected test current I splits along two paths into I1 flowing into the connected earthing system and I2 flowing into the electrode under test i e I I1 I2 The resistance of the 26 www actoolsupply com www actoolsupply com electrode under test is calculated as R V I2 or R V I I1 The current transducer ICLAMP measures I2 and feeds this value back to the instrument Principle of operation two clamp stakeless resistance measurement In this example the electrode under test is connected to a network of other electrodes It is either impractical or unsafe to disconnect an individual electrode for testing Also there might be insufficient space to perform a classic three terminal resistance measurement The stakeless test method using both VCLAMP and ICLAMP can be used to obtain a measurement for the electrode under test A defined test voltage is injected into the system using the VCLAMP inducing a current I to flow and be measured by the ICLAMP The model shown in Figure 7 can be simplified to the resistance of the electrode under test Rx and the resistance of the other electrodes in parallel i e R1 R2 Rn Therefore the current induced by the test voltage is I V R R R R It follows that as the resistance of the other electrodes in parallel approaches zero then the resistance measured approaches the value of the electrode under test Fi
8. DET3TC 8 Close the ICLAMP around the calibration lead which connects the 98 and terminals as shown in Figure 38 and terminals for DET3TC 56 www actoolsupply com 10 11 www actoolsupply com Figure 38 ICLAMP 100 calibration saN DET4TC2 DET4TCR2 ICLAMP DET3TC Press and hold the iq button until a 100 reading is obtained on the display Switch the instrument OFF using the selector switch The instrument is now calibrated to the ICLAMP and the calibration stored in non volatile memory www actoolsupply com 57 www actoolsupply com OPERATION OF THE TWO CLAMP CALIBRATION ADAPTOR Ensure the rotary selector switch is in the OFF position Connect the instrument as shown Note WOCLAMP Close the ICLAMP around one loop of the two clamp calibration adaptor Close the VCLAMP around the other loop of the two clamp calibration adaptor Ensure a minimum separation of 100mm between the ICLAMP and VCLAMP Set the rotary selector switch to the Le position LC Press and release the ew button by holding the WIA button the resistance measurement will be continually updated The instrument will perform pre measurement checks the status of which will be indicated on the display The two clamp resistance reading will be displayed and should match the value written on the two clamp calibration adaptor Ensure that the ICLAMP and VCLAMP jaw mating surfaces are free of du
9. Figure 17 example two terminal resistance reading Note m The test voltage used to make the two terminal resistance reading is a c and may not be suitable for continuity testing according to some local regulations B No resistance reading is possible if the ground noise voltage exceeds 100 V 36 www actoolsupply com www actoolsupply com Three terminal resistance measurement DET3TC DET3TD DET4TD2 DETATR2 DET4TC2 and DETATCR2 I ps Ensure the rotary selector switch is in the OFF position Connect the instrument as shown in Figure 18 Figure 18 instrument connection for measuring three terminal resistance Electrode Current stake under test Y a Potential stake DET3TD Electrode under test Current stake r DET4TD2 Potential stake DET4TR2 3 www actoolsupply com www actoolsupply com 1 y h 3 i j 1 i A i MAX 100V CAT IV Electrode under test S a Current stake Potential stake DET3TC Electrode under test Current stake v DET4TC2 Potential stake DET4TCR2 Set the rotary selector switch to the 34 position Select the desired test voltage using the PASIN button DET4TC2 and DET4TCR2 only Select the desired test frequency using the Hz button Press and release the MERI button by holding the MESI button the resistance measurement will be continually updated The instrument will perform pre meas
10. a voltage over range condition if the ground noise voltage is above 100 V no resistance reading is possible under these conditions 34 www actoolsupply com www actoolsupply com Two terminal resistance measurement DET3TA 1 Ensure the rotary selector switch is in the OFF position 2 Select the desired test voltage using the procedure in the section on General Operating Instructions 3 Connect the instrument as shown in Figure 15 Figure 15 instrument connection for measuring two terminal resistance Metallic interconnect 7 7 Electrode under test 4 Set the rotary selector switch to the position 5 The ground noise voltage will be indicated on the scale plate as shown in Figure 16 Figure 16 ground noise voltage indication 6 If the ground noise voltage is less than 40 V pk pk 14 V rms press and hold the TEST button Testing will be inhibited if the ground noise voltage exceeds 40 V pk pk Jh The Rc LED will flash to indicate that the instrument is carrying out pre measurement checks 35 www actoolsupply com www actoolsupply com 8 If the Rc LED does not illuminate following the pre measurement checks this indicates that the instrument fuse has ruptured 9 If the Rc LED illuminates solidly following the pre measurement checks this indicates that a two terminal measurement can be made 10 The two terminal resistance reading will be indicated on the scaleplate as shown in Figure 17
11. empty or exhausted battery the instrument may be recharged using the following procedure Warning Do not attempt to operate the instrument whilst the external AC DC adaptor is connected Warning Do not attempt to recharge non rechargeable dry cells in the DET4TR2 and DET4TCR2 Doing so will result in instrument damage and may cause personal injury Only use the cells recommended by Megger Warning Only use the external charging equipment provided by Megger 1 To avoid the possibility of electric shock switch instrument OFF and disconnect the instrument from any electrical circuits 2 Move the slide on the terminal panel until the external AC DC adaptor socket is exposed 20 www actoolsupply com www actoolsupply com 3 Remove the bung from the AC DC adaptor socket amp Connect the AC DC adaptor and switch on 5 The charging cycle will commence and last approximately 17 hours Follow the progress using the charge status LED as shown in Figure 2 NOTE The instrument ambient temperature should be between 10 C 50 F and 40 C 105 F during the charging cycle Figure 2 charge status LED progression Battery charging complete Battery charging in progress Defective non rechargeable cells detected or no batteries present Defective non rechargeable cells detected or no batteries present Charging terminated A AAA Battery type DET3TA DET3TC DETATD DET4TD2 DET4TC2 8 x AA LR6 1 5V Alkali
12. or X terminal on a three terminal instrument connects to the electrode under test This is shown in Figure 5 25 www actoolsupply com www actoolsupply com Figure 5 schematic for three terminal resistance measurement without lead null _ m x E P1 ES A Earth electrode Under test Potential stake Current stake Principle of operation three terminal resistance measurement using ART The classic three terminal test method has a disadvantage namely that the electrode under test must be disconnected from the system it is supposed to protect in the event of a power system fault The reason for this is that the injected test current will take all possible routes to ground and not all of it will necessarily flow through the electrode under test In this case the instrument will make a reading of the entire earthing network not just the individual electrode By using a current transducer the Megger ICLAMP to measure the current flowing through the electrode under test as a fraction of the total test current injected the instrument can determine the individual resistance This arrangement is shown in Figure 6 Figure 6 schematic for three terminal resistance measurement using ART without lead null Connection to rest of system g q ICLAMP 260 Earth electrode under test B Potential stake
13. DET4TCR2 s rechargeable batteries are replaced with alkaline batteries the instrument may automatically disable its charging circuit to prevent inadvertent charging of non rechargeable cells Follow the instructions below to switch the charger back on when the NiMH cells are re inserted 1 Switch the instrument on in to the M position while holding down the MI button The display will carry out a self test then briefly display the software version number 2 The screen will show the letters tst release the TEST button 3 The Charger Enable Screen will be shown see below J L Dell gt 4 The state of the charger circuit is shown by either a cross or a tick being shown below the letters CHg A cross indicates that the charger circuit is disabled 5 Ifthe cross is shown re enable the charger by pressing the TEST button once the cross should change to a tick 6 Switch the instrument OFF to save the new setting 22 www actoolsupply com www actoolsupply com FUSE Fuse status indication DET3TC DET3TD DET4TD2 DET4TR2 DET4TC2 and DET4TCR2 The fuse blown status indicator is displayed whilst the instrument is switched on and performing a test as shown Fuse blown Fuse status indication DET3TA The fuse blown indication is given by the Rc LED when performing a test as shown Fuse blown RC Fuse type All instruments 500 mA F HBC 50 kA 600 V 32mm x 6mm Megge
14. Hz e 28 1 ee A Test lead connections at rear of instrument www actoolsupply com 17 www actoolsupply com DET4TCR2 Test lead LCD display connections at rear Resistance measurement settings c Selector switch Voltage and current measurement settings Backlight control button Test button Frequency select button 25 V 50 V output voltage select button Ruptured fuse Warning refer to Battery charge CEDE RUP indicator user manual indicator ART measurement indicator 5V Possible Not possible Over under _ AN range indicator 90V Measuring range NN Clamp Potential probe pai dis Ground noise voltage Umeha i dir indicator OK Not OK resistance indicator n aa indicator OK Not OK OK Not OK 12V Test lead connections at rear of instrument 18 www actoolsupply com www actoolsupply com BATTERY Battery status indication DET3TC DET3TD DET4TD2 and DET4TC2 The battery condition indicator is displayed whilst the instrument is switched on as shown 100 battery charge remaining lz 75 battery charge remaining 50 battery charge remaining IE 2596 battery charge remaining LILL L 3 ELI L 3 L 3 C ez uam S P C C EE d Some charge remaining but instrument may auto power down at any time LLL L 3 EL N 0 battery charge remaining
15. Instrument is performing pre measurement checks aS 11 www actoolsupply com www actoolsupply com INSTRUMENT ILLUSTRATIONS DET3TA Multi function Test lead analogue display connections at rear Rc OK 9 7 Megger DET3TA Resistance measurement settings 2P and 3P Spike button Selector switch Battery check setting voltage setting Test button Resistance scale Voltage scale Potential test spike resistance indicator Battery charge indicator MAX 100V CAT IV 557 oa I j AN 128Hz Test lead connections at rear of instrument www actoolsupply com 12 www actoolsupply com DET3TC Test lead LCD display connections at rear Resistance Megger DET3TC measurement settings 2P and 3P and clamp Selector switch Voltage and current measurement settings voltage select button Test button Ruptured fuse Warning refer to indicator user manual Battery charge indicator Output voltage indicator x Over under 25V ange SOV Em am ARTY EE p v ART measurement X indicator Possible Not possible Or l wo range e BBE i v v 4 UP x Rox V ices Potential probe Current probe Ground noise voltage Clamp resistance indicator resistance OK Not indicator OK Not OK current presence OK Not OK OK indicator OK Not OK 128Hz Test lead connections at rear of instrument
16. actoolsupply com www actoolsupply com DET4TR2 LCD display Test lead connection at d Resistance measurement settings 2P 3P and 4P Megger DETATR2 1 2568 S Selector switch YY Voltage measurement settings Test button 25 V 50 V output voltage select button Output voltage Ruptured fuse Warning refer to indicator indicator user manual Battery charge 29V BH Rp Rc p A V n Ground noise voltage Measuring range 7x Over indicator OK high under Potential b Current probe resistance range e OK or high indicator Resistance indicator OK or high 12V 100V re CAT IV e c o Test lead connections at rear of instrument 16 www actoolsupply com www actoolsupply com DET4TC2 LCD display Test lead connections at rear Resistance measurement settings Selector switch Voltage and current measurement settings Backlight control button Test button Frequency select button 25 V 50 V output voltage select button Ruptured fuse Warning refer to indicator lod manual Battery charge indicator still 25V ART measurement indicator TTT A RTX RI x nm No 90V possible MENDA gt QUEE H 7 m kO Measuring range A ve TE LE ELSE MA La C Vee ICX d RP Potential probe Current probe pd noise voltage Clamp resistance indicator resistance OK Not indicator OK Not OK current presence OK Not OK OK indicator OK Not OK 128
17. alues with tolerance or limits are guaranteed data Parameters without tolerances are for information only Ingress protection IP54 C stake P stake and Noise check Automatic Noise rejection 40 V pk to pk 14 V rms 2 wire 3 wire 4 wire test Yes no shorting links required No disconnect testing ART Yes with ICLAMP Stakeless measurement Yes with ICLAMP and VCLAMP Instrument output Voltage 25 V or 50 V at 128Hz DET3TA DET3TC DET3TD DET4TD2 and DET4TR2 Voltage 25V or 50V at 94Hz 105Hz 111Hz and 128Hz DET4TC2 and DET4TCR2 Current 4 5 mA or 0 45mA DET3TA DET3TC DET3TD DET4TD2 and DET4TR2 Current 4 5 mA or 0 45mA and 0 045 mA DET4TC2 and DET4TCR2 Ground current range with clamp 0 5 mA to 19 9 A Ground current accuracy 5 3 digits Ground voltage range 0 to 100 Vac Ground voltage accuracy 2 2V Resistance range 0 01 Q to 2 KQ DET3TA DET3TC DET3TD 0 01 Q to 20 kO DET4TD2 and DET4TR2 0 01 Q to 200 kQ DET4TC2 and DET4TCR2 Resistance accuracy 2P measurements 2 3 digits 3P measurements 2 3 digits 4P measurements 2 3 digits ART measurements 5 3 digits Stakeless measurements 7 3 digits Maximum probe resistance Rp limit 100 kQ 5 0 V output voltage Rc limit 100 kQ 50 V output voltage Limits reduced to 50 kQ for 25 V output voltage Limits reduced to 5 kQ for 0 01 Q resolution Display 31 digit high contrast liquid crystal
18. backlit Battery type DET3TA DET3TC DET3TD DET4TD2 DET4TC2 8 off AA LR6 dry cells DET4TCR2 DET4TR2 8 off AA LR6 NiMH rechargeable cells Operating temperature range 15 C to 55 C 5 F to 131 F Storage temperature range 40 C to 70 C 40 F to 158 F Safety Complies with the requirements of EN61010 1 100V CAT IV between terminal pairs EMC In accordance with IEC61326 including amendment No 1 Standards compliance Complies with the requirements of KEMA K85B Complies with the following parts of EN61557 Electrical safety in low voltage distribution systems up to 1000 V a c and 1500 V d c Equipment for testing measuring or monitoring of protective measures Part 1 General requirements Part 5 Resistance to earth Dimensions 203mm x 148mm x 78mm 8in x 5 8in x 3in Weight 1 kg 2 2 lb 61 www actoolsupply com www actoolsupply com ICLAMP SPECIFICATIONS Measurement range 1 mA to 1200 A Transformation ratio 1000 1 Output signal 1 mA A 1 A 1000 A Accuracy 1mA to 100 mA 3 of reading 0 1 A to 1A lt 2 of reading 1 Ato 10A lt 1 of reading 10 A to 100 A S0 596 of reading Operating temperature 10 C to 50 C 14 F to 122 F 0 to 85 RH at 35 C 95 F Storage temperature 20 C to 70 C 4 F to 158 F Jaw opening 57 mm maximum 2 3 in Maximum conductor size 52 mm 2 1 in Insulation Double insulation Voltage rating 600 V
19. ce with lead null reading DET4 display shown 90V Note B The instrument will display the warning triangle and an excessive noise voltage indicator if the ground noise voltage is above 40 V pk pk 14 Vrms B The instrument will display the warning triangle and a voltage over range condition if the ground noise voltage is above 100 V no resistance reading is possible under this condition 44 www actoolsupply com www actoolsupply com Four terminal resistivity measurement DET4TD DET4TR2 DET4TC2 and DET4TCR2 The DET4TD2 DET4TR2 DET4TC2 and DET4TCR2 can be used to make soil resistivity measurements The resistivity value can be derived from the four terminal resistance reading made by the instrument and the particular separation and depth of the stakes 1 Ensure the rotary selector switch is in the OFF position 2 Connect the instrument as shown in Figure 27 Figure 27 instrument connection for measuring four terminal resistance DET4TC2 DET4TCR2 3 Set the rotary selector switch to the position 4 Select the desired test voltage using the button 5 DET4TC2 and DET4TCR2 only Select the desired test frequency using the Hz button 6 Press and release the TEST button by holding the TEST button the resistance measurement will be continually updated 9 The instrument will perform pre measurement check the status of which will be indicated on the display 8 The four terminal resista
20. d null using ART DET4TC2 and DET4TCR2 In certain circumstances the resistance of the test leads connecting to the electrode under test may itself form a significant part of the measurement electrode resistance This effect can be eliminated using the lead null technique described in this section Before making a measurement using ART please follow the procedure contained in the section on ICLAMP calibration 1 Ensure the rotary selector switch is in the OFF position 2 Connect the instrument as shown in Figure 33 Figure 33 instrument connection for measuring three terminal resistance with lead null using ART Electrode under test Current stake p DETATCZ Potential stake DETATCR2 2 Close the ICLAMP around the conductor under test 4 Set the rotary selector switch to the LEES oin 5 DET4TC2 and DET4TCR2 only Select the desired test frequency using the Hz button 6 Press and release the TEST button by holding the TEST button the resistance measurement will be continually updated ps The instrument will perform pre measurement checks the status of which will be indicated on the display 8 The three terminal resistance reading with lead null using ART will be displayed as shown in Figure 34 52 www actoolsupply com www actoolsupply com Figure 34 example three terminal resistance reading with lead null using ART DET4 display shown This means that interference
21. earth or eround electrode rod resistance and soil resistivity The family has seven variants supporting 2 3 and 4 wire measurements The DET3TA provides 2 and 3 wire measurements and offers an analogue display The DET3TC and DET3TD provide 2 and 3 wire measurements and offer a digital display The DET4TD2 DET4TR2 DET4TC2 and DET4TCR2 provide 2 3 and 4 wire measurement and offer a digital display The DET4TR2 and DET4TCR2 provide a rechargeable battery power source The DET4TC2 and DET4TCR2 offer variable frequency testing 94 Hz 105 Hz 111 Hz and 128 Hz and measurement to 200 kQ The DET3TC DET4TC2 and DET4TCR2 can use an optional current clamp ICLAMP to measure conductor current and electrode rod resistance without disconnection leaving the installation earthing system intact Attached Rod Technique ART Additionally the DET4TC2 and DET4TCR2 can drive an optional voltage inducing clamp VCLAMP which in conjunction with the ICLAMP can be used to make stakeless measurements of the earthing system www actoolsupply com www actoolsupply com The DET family have the following features Feature DET3TA DET3TD DET3TC DET4TD2 DET4TR2 DET4TC2 Automatic C E stake check Automatic P NEM stake check Manual P stake NEN check check check 40 V pk pk frequency test testing ART measurement Voltmeter ground noise voltage measurement meter EN61010 1 100V CAT IV Built in battery charger ww
22. elected by the operator based on local safety procedures The procedure for changing the output voltage is as follows DET3TA 1 Press and hold the Wi button and switch instrument ON to the ff setting using the selector switch 2 The needle will sweep across the scaleplate and return to the rest position On older DET3TC and DET3TD instruments the firmware version will be displayed followed by tst 3 Release TEST button The maximum output test voltage will be displayed either 50 V or 9 V 4 To toggle between the maximum output test voltages press the TEST button p Switch off instrument when the desired maximum test voltage is displayed DET3TC DET3TD DET4TD2 DET4TR2 DET4TC2 and DET4TCR2 1 Press the PEYMEID button after selecting the measurement mode the display will indicate the selected output voltage Note For ART mode the output voltage is automatically set to 25 V and cannot be changed Note Some older versions of the DET3TC and DET3TD do not have the the PRYMEBIDM button The procedure for changing the output voltage is as per the DET3TA Auto power down To extend battery life the instrument will automatically switch off six minutes after the last operation The instrument can be switched back on by turning the selector switch to the OFF position and then selecting the desired mode of operation Display symbols DET3TC DET3TD DET4TD2 DET4TR2 DET4TC2 and DET4TCR2 Symbol Meaning N Warn
23. esistance Metallic interconect A Electrode under test DET3TD Metallic interconnect Vg Electrode DET4TD2 under test DETATR2 www actoolsupply com 32 www actoolsupply com l Es b 1 E 4 i f 1 f j i i MAX 100V CAT IV X Y Metallic interconnect y4 Wg Electrode under test DET3TC Metallic interconnect Electrode under test DET4TC2 DETATCR2 Set the rotary selector switch to the M position Select the desired test voltage using the PASIN button DET4TC2 and DET4TCR2 only Select the desired test frequency using the Hz button Press and release the MERE button by holding the MESI button the resistance measurement will be continually updated The instrument will perform pre measurement check the status of which will be indicated on the display The two terminal resistance reading will be displayed as shown in Figure 14 33 www actoolsupply com www actoolsupply com Figure 14 example two terminal resistance reading DET4 display shown 90V Note The test voltage used to make the two terminal resistance reading is a c and may not be suitable for continuity testing according to some local regulations The instrument will display the warning triangle and an excessive noise voltage indicator if the ground noise voltage is above 40 V pk pk 14 Vrms The instrument will display the warning triangle and
24. exceeds 40Vpk pk pA The P stake resistance will be indicated on the scaleplate the needle will move into the green region Figure 22 if the P stake resistance is within limits for an accurate measurement and into the red region Figure 23 if the P stake resistance exceeds the limits for an accurate measurement 40 www actoolsupply com 10 11 12 13 www actoolsupply com Figure 22 P stake resistance OK green region 100 25 10 60 Figure 23 P stake resistance not OK red region 100 25 10 60 If the P stake resistance is acceptable needle in the green region of the scaleplate release the ya button Press and hold the WI button The Rc LED will flash to indicate that the instrument is carrying out pre measurement checks If the Rc LED does not illuminate following the pre measurement checks this indicates that the C stake resistance exceeds the limits for an accurate measurement or that the instrument fuse has ruptured If the Rc LED illuminates solidly following the pre measurement checks this indicates that a three terminal measurement can be made The three terminal resistance reading will be indicated on the scaleplate as shown in Figure 24 41 www actoolsupply com www actoolsupply com Figure 24 example three terminal resistance reading Note B No resistance reading is possible if the ground noise voltage exceeds 100 V www actoolsup
25. gure 7 schematic for two clamp stakeless resistance measurement Connection to rest of system i o T Earth electrode under test 2 www actoolsupply com www actoolsupply com Principle of operation four terminal resistivity measurement The soil resitivity measurement works on a similar principle to the other measurements which use stakes a current is injected around an outer loop and a voltage measured shown in Figure 8 In this case however the measurement made by the instrument requires further conversion using a formula to derive the volumetric soil resistivity from the resistance value display Figure 8 schematic for 4 terminal resistivity measurement For this test the relative spacing and depth of the stakes is important When configured as shown in Figure 8 the soil resistivity can be calculated from the resistance value R displayed on the instrument as p 2xmxAXxR 28 www actoolsupply com www actoolsupply com Measurement of ground noise voltage DET3TC DET3TD DET4TD2 DETATR2 DET4TC2 and DET4TCR2 1 Ensure the rotary selector switch is in the OFF position PA Connect the instrument as shown in Figure 9 Figure 9 instrument connection for measuring ground noise voltage Potential stake A Electrode under test DET3TD Potential stake S Electrode DET4TD2 under test DET4TR2 www actoolsupply com 4 www actoolsupply com N d MAX 100V
26. has been detected which may impair the accuracy of the measurement In particular the reading could be lower than the actual resistance The resistance of the electrode or system must be verified by an alternative method Note B The instrument will display the warning triangle and an excessive noise voltage indicator if the ground noise voltage is above 40 V pk pk 14 Vrms B The instrument will display the warning triangle and a voltage over range condition if the ground noise voltage is above 100 V no resistance reading is possible under this condition B The instrument will display the warning triangle above 2 A no ART testing is possible under this condition B The instrument will display the warning triangle and an over range condition above 20 A no ART testing is possible under this condition B Ensure that the ICLAMP jaw mating surfaces are free of dust and contamination and that they contact completely when the ICLAMP is closed B Currents carried by conductors in close proximity to the ICLAMP may affect calibration and reduce the accuracy of measurements made 53 www actoolsupply com www actoolsupply com Two clamp stakeless measurement DET4TC2 and DET4TCR2 Before making a stakeless measurement please follow the procedures contained in the sections on ICLAMP calibration 1 Ensure the rotary selector switch is in the OFF position 2 Connect the instrument as shown in Figure 25
27. hat you read and understand the following safety warnings and instructions before attempting to use the instruments This user manual describes the operation and functions of the DET series of Earth Ground Testers BH DET3TA B DET3TC B DET3TD B DET4TD2 B DET4TR2 B DET4TC2 B DET4TCR2 B ICLAMP B VCLAMP B CALIBRATION ADAPTOR B TWO CLAMP CALIBRATION ADAPTOR www actoolsupply com www actoolsupply com N SAFETY WARNINGS Safety Warnings and Precautions must be read and understood before the instrument is used They must be observed during use Do not leave the instrument connected to the system under test when not in use Do not touch circuit connections and exposed metalwork of an installation or equipment under test Do not touch the earth stakes test leads and their terminations including connections to the earthing system under test if an installation earth fault can arise unless adequate precautions are taken Do not touch the earth stakes test leads and their terminations including connections to the earthing system under test while the instrument is switched on Do not operate the instrument or connect it to any external system if it shows any visible signs of damage or if it has been stored for prolonged periods in unfavourable conditions Do not operate the instrument or connect it to any external system if the battery compartment or casing is open or any parts of the case including keypad selecto
28. he system under test through fuses that are rated to handle the likely maximum fault voltages and currents that could be encountered at the installation N BATTERY INSTALLATION Warning Whenever battery cells are being fitted or replaced there should be no connections to the instrument terminals and the instrument should be switched off Warning To avoid damage by leaking electrolyte or deep discharge do not leave cells fitted in an instrument which will remain unused for extended periods of time Warning Incorrect battery cell polarity can cause electrolyte leakage resulting in damage to the instrument If the battery condition indicator does not show a full charge when battery cells are new a cell may be reversed DET4TR2 and DET4TCR2 ONLY Warning Only use the cells recommended by Megger part number 25985 031 N BATTERY CHARGING DET4TR2 and DETATCR2 ONLY Warning Whenever battery cells are being recharged there should be no connections to the instrument terminals and the instrument should be switched off Warning Do not attempt to recharge non rechargeable dry cells in the DET4TR2 and DET4TCR2 Doing so will result in instrument damage and may cause personal injury Warning Only use the charging equipment provided by Megger for use with this instrument www actoolsupply com www actoolsupply com GENERAL DESCRIPTION The Megger DET family of test instruments offers a unique solution to the measurement of
29. ing triangle Refer to user guide Lt Fuse blown TETTE Battery indicator ARTY Situation is suitable for making ART measurements DET3TC DET4TC2 and DET4TCR2 only ART Situation is not suitable for making ART measurements DET3TC x DETATC2 and DETATCR2 only 10 www actoolsupply com www actoolsupply com gt 1 OOV Indicates that the ground noise voltage exceeds the instrument measurement capability test is inhibited Rp Potential stake P stake is within range for accurate measurement Potential stake P stake resistance exceeds range for accurate x measurement of Current stake C stake is within range for accurate Rc Measurement ED C Current stake C Stake resistance exceeds range for accurate x measurement U v Ground noise voltage is within range for accurate measurement of V resistance U Ground noise voltage exceeds range for accurate measurement of V x resistance LEC v ICLAMP is connected VCLAMP is connected DET3TC DET4TC2 and DETATCR2 only CC ICLAMP is not connected VCLAMP is not connected DET3TC DET4TC2 x and DETATCR2 only ILC v Sufficient ICLAMP current DET3TC DETATC and DET4TCR only L IC x Insufficient ICLAMP current DET3TC DET4TC2 and DET4TCR2 only Display symbols DET3TA Symbol Meaning Current stake C Stake resistance exceeds range for accurate measurement Re OR Fuse blown Current stake C stake is within range for accurate measurement Rc o
30. m 4 4in x 8 5in x 1 8in Weight 0 1 kg approximately 0 2 Ib www actoolsupply com 63
31. nce reading will be displayed as shown in Figure 28 45 www actoolsupply com www actoolsupply com Figure 28 example four terminal resistance reading DET4 display shown 9 A soil resistivity value can be derived from the resistance reading and the stake geometry Note B The instrument will display the warning triangle and an excessive noise voltage indicator if the ground noise voltage is above 40 V pk pk 14 Vrms E The instrument will display the warning triangle and a voltage over range condition if the ground noise voltage is above 100 V no resistance reading is possible under this condition 46 www actoolsupply com www actoolsupply com Measurement of ground current DET3TC DET4TC2 and DET4TCR2 Before measuring ground current please follow the procedure contained in the section on ICLAMP calibration 1 2 Ensure the rotary selector switch is in the OFF position Connect the instrument as shown in Figure 29 Figure 29 instrument connection for measuring ground current MAX 100V CAT IV Installation o pe earthing 0 ay conductor ICLAMP Electrode under test EEG Installation o gt pe earthing CUm AMP conductor Electrode DETATCR2 under test DETATC2 Close the ICLAMP around the conductor under test Set the rotary selector switch to the A position The ground current flowing in the conductor will be displayed as shown in Figure 30 47 www actools
32. ne Megger part number 25511 841 DET4TR2 DET4TCR2 8 x AA LR6 1 2V NiMH 1800mAhr Megger part number 25985 0231 Battery replacement Battery replacement Warning Do not operate instrument with the battery cover removed Warning Incorrect battery cell polarity can cause electrolyte leakage resulting in damage to the instrument If the battery condition indicator does not show a full charge when battery cells are new a cell may be reversed Warning To avoid damage by leaking electrolyte or deep discharge do not leave cells fitted in an instrument which will remain unused for extended periods of time 1 To avoid the possibility of electric shock switch instrument OFF and disconnect the instrument from any electrical circuits 2 The rear cover must not be opened if the test leads are connected 21 www actoolsupply com www actoolsupply com 3 To avoid the possibility of electric shock do not press the Ri button or touch the fuse when changing batteries 4 To remove the rear cover release the screw at the bottom of the cover and lift the cover upwards 5 Remove the exhausted cells and dispose of in an appropriate manner 6 Refit new batteries of the correct type observing the correct polarity as marked on the battery compartment p Replace the instrument back cover and secure by tightening the retaining screw Re enabling the battery charging circuit on the DETATR2 and DETATCR2 If the DETATR2 and
33. ply com 42 www actoolsupply com Three terminal resistance measurement with lead null DET4TD2 DET4TR2 DET4TC2 and DET4TCR2 In certain circumstances the resistance of the test lead connecting to the electrode under test may itself form a significant part of the measurement electrode resistance This effect can be eliminated using the lead null technique described in this section 1 Ensure the rotary selector switch is in the OFF position 2 Connect the instrument as shown in Figure 25 Figure 25 instrument connection for measuring three terminal resistance with lead null and SCAT IV R EX HY AN am Electrode under test Current stake a DETATD2 Potential stake DETATR2 Electrode under test Current stake Va DET4TC2 Potential stake DET4TCR2 on Set the rotary selector switch to the position 4 Select the desired test voltage using the PRARVEIMB button 5 DET4TC2 and DET4TCR2 only Select the desired test frequency using the Hz button 43 www actoolsupply com www actoolsupply com 6 Press and release the MIR button by holding the MSS button the resistance measurement will be continually updated ve The instrument will perform pre measurement check the status of which will be indicated on the display 8 The three terminal resistance with lead null reading will be displayed as shown in Figure 26 Figure 26 example three terminal resistan
34. r part number 25950 056 Fuse replacement Warning Do not operate instrument with the battery cover removed Warning Fitting an incorrect fuse type will reduce operator safety 1 To avoid the possibility of electric shock switch instrument OFF and disconnect the instrument from any electrical circuits 2 The rear cover must not be opened if the test leads are connected 3 To remove the rear cover release the screw at the bottom of the cover and lift the cover upwards 4 To avoid the possibility of electric shock do not press the TEST button when changing the fuse 5 Remove the ruptured fuse 6 Refit new fuse of the correct type p Replace the instrument back cover and secure by tightening the retaining screw 23 www actoolsupply com www actoolsupply com DESCRIPTION OF TESTS The description of tests contained within this user guide are instructions for the use of the DET family of instruments by competent persons Suitable applications Where there is doubt about a particular application reference should be made to the advice and guidance contained in the publication Getting Down to Earth which is available from Megger part number 21500 O72 The DET range of instruments can be used in agricultural locations as per IEC 61557 5 In these circumstances the output voltage should be switched to 25 V in order to comply with the standard The DET range of instruments makes resistance measurements using a s
35. r switch display window etc are missing Special precautions are necessary when operating in situations where live earths may be encountered isolation switches and fuses not supplied with this instrument must be used Special precautions are necessary when working near high tension systems MV and HV rubber gloves and shoes not supplied with this instrument should be worn Special precautions are necessary when working in wet conditions or in agricultural areas observe the local safety standards and take all necessary special precautions applicable to the particular location and do not touch the test leads with bare hands Always disconnect the instrument from the earthing system under test while batteries are being changed or the fuse replaced Always replace batteries and fuses with parts of the correct type and rating Do not replace the rechargeable cells in the DETATR2 and DETATCR2 with non rechargeable dry cells Do not use any other charging equipment other than that supplied by Megger for use with the DET4TR2 and DET4TCR2 Do not operate the charging equipment supplied with the DET4TR2 and DET4TCR2 in damp or wet environments or outside NOTE THE INSTRUMENT MUST ONLY BE USED BY SUITABLY TRAINED AND COMPETENT PERSONS Users of this equipment and or their employers are reminded that National Health and Safety Legislation requires them to carry out valid risk assessments of all electrical work so as to identif
36. st and contamination and that they contact completely when the units are closed Currents carried by conductors in close proximity to the ICLAMP may affect calibration and reduce the accuracy of measurements made 58 www actoolsupply com www actoolsupply com OPERATION OF THE CALIBRATION ADAPTOR 1 Ensure the rotary selector switch is in the OFF position 2 Connect the instrument as shown d t D h MAX 100V 4 CAT IV xL L CALIBRATION ADAPTOR 2s Set the rotary selector switch to the By Ej or Ay position 4 Press and release the TEST button by holding the TEST button the resistance measurement will be continually updated 5 The instrument will perform pre measurement checks the status of which will be indicated on the display 6 The resistance reading will be displayed and should match the value written on the calibration adaptor 59 www actoolsupply com www actoolsupply com PREVENTIVE INSTRUMENT MAINTENANCE I The DET series instruments require very little maintenance Test leads should be checked before use to ensure there is no damage Ensure batteries are removed if left unused for extended periods When necessary the instrument can be cleaned with a damp cloth Do not use alcohol based cleaners as these may leave a residue www actoolsupply com 60 www actoolsupply com TECHNICAL SPECIFICATION DET3Tx amp DETATx Only v
37. st current injection and voltage measurement as used for the two terminal method The DET injects an a c current of known magnitude into the system under test and measures the voltage developed across it as shown in Figure 4 The system resistance is a simple ratio as per Ohm s Law In this case the potential stake is moved by fixed increments in a straight line between the electrode under test and the current stake At each location the resistance is calculated as R V I A graph of resistance versus potential stake position is plotted and the resistance of the electrode under test is taken to be the point at which the curve is flattest Empirical testing has shown that with suitably positioned stakes this method can be shortened by placing the potential stake at a distance of approximately 62 between the electrode under test and the current stake i e at A 0 62 x B Figure 4 schematic for three terminal resistance measurement with lead null CO C1 E X P1 ES A Earth electrode under test B Potential stake Current stake In this diagram thetlana gf terminals are connected together at the electrode under test This is the three terminal with lead null configuration which is only applicable in four terminal testers This configuration allows the resistance of the Ml lead to the electrode under test to be nulled out For three terminal testers or when lead null is not required only the ll terminal
38. three terminal resistance reading using ART will be displayed as shown in Figure 32 Figure 32 example three terminal resistance reading using ART DET4 display shown p This means that interference has been detected which may impair the accuracy of the measurement In particular the reading could be lower than the actual resistance The resistance of the electrode or system must be verified by an alternative method Note m The instrument will display the warning triangle and an excessive noise voltage indicator if the ground noise voltage is above 40 V pk pk 14 Vrms 50 www actoolsupply com www actoolsupply com The instrument will display the warning triangle and a voltage over range condition if the ground noise voltage is above 100 V no resistance reading is possible under this condition The instrument will display the warning triangle above 2 A no ART testing is possible under this condition The instrument will display the warning triangle and an over range condition above 20 A no ART testing is possible under this condition Ensure that the ICLAMP jaw mating surfaces are free of dust and contamination and that they contact completely when the ICLAMP is closed Currents carried by conductors in close proximity to the ICLAMP may affect calibration and reduce the accuracy of measurements made 51 www actoolsupply com www actoolsupply com Three terminal resistance measurement with lea
39. upply com www actoolsupply com Figure 30 example ground current reading DET4 display shown Note B The instrument will display the warning triangle above 2 A no ART testing is possible under this condition B The instrument will display the warning triangle and an over range condition above 20 A no ART testing is possible under this condition www actoolsupply com 48 www actoolsupply com Three terminal resistance measurement using ART DET3TC DET4TC2 and DETATCR2 Before making a measurement using ART please follow the procedure contained in the section on ICLAMP calibration 1 Ensure the rotary selector switch is in the OFF position 2 Connect the instrument as shown in Figure 31 Figure 31 instrument connection for measuring three terminal resistance using ART Electrode under test Current stake 5 Potential stake DET3TC Electrode under test Current stake WA NT DET4TC2 Potential stake DET4TC R2 25 Close the ICLAMP around the conductor under test 4 Set the rotary selector switch to the LK ones 5 DET4TC2 and DET4TCR2 only Select the desired test frequency using the Hz button 49 www actoolsupply com www actoolsupply com 6 Press and release the TEST button by holding the TEST button the resistance measurement will be continually updated 7 The instrument will perform pre measurement checks the status of which will be indicated on the display 8 The
40. urement check the status of which will be indicated on the display The three terminal resistance reading will be displayed as shown in Figure 19 38 www actoolsupply com www actoolsupply com Figure 19 example three terminal resistance reading DET4 display shown 50V n an z LJ f Note B The instrument will display the warning triangle and an excessive noise voltage indicator if the ground noise voltage is above 40 V pk pk 14 Vrms B The instrument will display the warning triangle and a voltage over range condition if the ground noise voltage is above 100 V no resistance reading is possible under this condition 39 www actoolsupply com www actoolsupply com Three terminal resistance measurement DET3TA 1 Ensure the rotary selector switch is in the OFF position 2 Select the desired test voltage using the procedure in the section on General Operating Instructions a Connect the instrument as shown in Figure 20 Figure 20 instrument connection for measuring three terminal resistance Electrode under test S r Current stake Potential stake 4 Set the rotary selector switch to the position 5 The ground noise voltage will be indicated on the scaleplate as shown in Figure 21 Figure 21 ground noise voltage indication 100 25 10 6 If the ground noise voltage is less than 40Vpk pk 14Vrms press and hold the button Testing will be inhibited if the ground noise voltage
41. w actoolsupply com DET4TCR2 www actoolsupply com Each instrument kit comprises the following DET instrument Test leads for 3 wire instruments lead lengths are 3m 10m and 15m for 4 wire instruments 3m 10m 10m and 15m Test stakes for 3 wire instruments 2 stakes are supplied for 4 wire instruments 4 stakes are supplied Batteries 8x AA LR6 alkaline except DET4TR2 and DET4TCR2 Batteries 8x AA LR6 1800 mA hr NiMH DET4TR2 and DET4TCR2 only Warranty card Calibration certificate not DET3TA Owners CD ROM manual Tough polypropylene carrying case External AC DC adaptor DET4TR2 and DET4TCR2 only www actoolsupply com www actoolsupply com PREPARATIONS FOR USE Batteries The Megger DET series instruments are supplied with batteries fitted When batteries become exhausted refer to the section on battery replacement or recharging Warning Do not switch the instrument on with the battery cover removed Inspection Before each use of the instrument visually inspect the instrument case test leads stakes and connectors to confirm that their condition is good with no damaged or broken insulation www actoolsupply com www actoolsupply com GENERAL OPERATING INSTRUCTIONS Instrument output voltage selection The maximum output voltage of the instrument is 50 V It is possible to reduce this to 25 V for operation in situations which require it The most appropriate output voltage should be s
42. witched DC signal at a frequency of 128 Hz The DET4TC2 and DET4TCR2 provide the user with the option to select 94 Hz 105 Hz 111 Hz or 128 Hz as the test frequency Note about measurements when connecting the instrument to electrodes ensure that any leads and cables are fully unwound and laid out without loops Principle of operation two terminal resistance measurement This technique is used to measure the resistance between two earth points e g between an earth electrode of unknown resistance and a known good ground connection such as metallic underground pipework or building steelwork The DET injects an a c current of known magnitude into the system under test and measures the voltage developed across it as shown in Figure 3 The system resistance is a simple ratio as per Ohm s Law i e R V Figure 3 schematic for two terminal resistance measurement C1 E X P2 P S P1 ES qos C2 C H Second earth electrode or other low resistance conductive connection to Earth Earth electrode under test E The DET instruments automatically link the EHS and P2 terminals when a two terminal test is selected 24 www actoolsupply com www actoolsupply com Principle of operation three terminal resistance measurement The classic fall of potential test is used to accurately measure the resistance of an earth electrode using auxiliary stakes driven into the soil which form a circuit for the te
43. www actoolsupply com t PPLY C O M Megger DET Series EARTH GROUND ELECTRODE TESTERS Megger DET3TC Earth Ground Resistance Tester Megger DET3TD Earth Ground Resistance Tester USER GUIDE www actoolsupply com www actoolsupply com CONTENTS CONTENTS 2 INTRODUCTION 3 N SAFETY WARNINGS 4 A LIVE EARTH SAFETY PRECAUTIONS 5 N BATTERY INSTALLATION 5 NBATTERY CHARGING DET4TCR2 and DET4TR2 ONLY 5 GENERAL DESCRIPTION 6 PREPARATIONS FOR USE 9 GENERAL OPERATING INSTRUCTIONS 10 INSTRUMENT ILLUSTRATIONS 12 BATTERY 18 DESCRIPTION OF TESTS 23 PREVENTIVE INSTRUMENT MAINTENANCE 60 TECHNICAL SPECIFICATION 61 REPAIR AND WARRANTY 64 Symbols used on the instrument are AN Caution refer to accompanying notes o Equipment protected throughout by Double Insulation C C Equipment complies with current EU directives Equipment complies with C tick requirements m Do not dispose of in normal waste stream Note The safety warnings provided in this document are indicative of safe practice and shall not be considered exhaustive Additionally they are not intended to replace local safety procedures where the instrument is being used Note This user guide uses the terms earth and ground interchangeably www actoolsupply com www actoolsupply com INTRODUCTION Thank you for purchasing the Megger Earth Ground Tester For your own safety and to get the maximum benefit from your instrument please ensure t
44. y potential sources of electrical danger and risk of electrical injury such as inadvertent short circuits Where the assessments show that the risk is significant then the use of fused test leads may be appropriate www actoolsupply com www actoolsupply com N LIVE EARTH SAFETY PRECAUTIONS A Live earth is one that carries current from the mains supply or could do so under fault conditions The following warnings apply in addition to those listed previously B All persons involved must be trained and competent in isolation and safety procedures for the system to be worked on They must be clearly instructed not to touch the earth electrode test stakes test leads or their terminations if any Live earths may be encountered It is recommended that they wear appropriate rubber gloves rubber soled shoes and stand on a rubber mat B The earth electrode under test should be isolated from the circuit it is protecting before testing commences If this is not possible ART may be used to measure electrode resistance m The instrument terminals should be connected to the system under test through isolation switches that are rated to handle the likely maximum fault voltages and currents that could be encountered at the installation The isolation switch must be open whilst any personal contact is made with the remote test stakes or the connecting leads e g when changing their position B The instrument terminals should be connected to t

Megger DET3TC User Guide

Contents

Download Pdf Manuals

Related Search

Related Contents