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DET Series
EARTH GROUND ELECTRODE TESTERS

USER GUIDE

Summary of Contents for DET Series

Page 1: ...DET Series EARTH GROUND ELECTRODE TESTERS USER GUIDE...

Page 2: ...d throughout by Double Insulation c Equipment complies with current EU directives Equipment complies with C tick requirements Do not dispose of in normal waste stream CAT IV 100 V Over voltage categor...

Page 3: ...instruments This user manual describes the operation and functions of the DET series of Earth Ground Testers DET3TA DET3TC DET3TD DET4TD2 DET4TR2 DET4TC2 DET4TCR2 MCC CLAMP MVC CLAMP CALIBRATION ADAP...

Page 4: ...t 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 rechargeabl...

Page 5: ...als 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...

Page 6: ...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...

Page 7: ...ent n n n n n n n Current meter n n n LCD display n n n n n n Backlit display n n Moving coil meter n IP54 rated n n n n n n n EN61010 1 100 V CAT IV n n n n n n n Built in battery charger n n Each in...

Page 8: ...usted 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...

Page 9: ...he the 25 V 50 V 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 las...

Page 10: ...MP current DET3TC DET4TC2 and DET4TCR2 only Display symbols DET3TA Symbol Meaning Rc Current stake C Stake resistance exceeds range for accurate measurement OR Fuse blown Rc Current stake C stake is w...

Page 11: ...ions at rear Rc OK Resistance measurement settings 2P and 3P Selector switch Battery check setting voltage setting Test button Spike button Resistance scale Voltage scale Potential test spike resistan...

Page 12: ...on Over under range indicator Output voltage indicator Ruptured fuse indicator Warning refer to user manual Battery charge indicator ART measurement indicator Possible Not possible Measuring range Cla...

Page 13: ...tput voltage select button Test button Over under range indicator Output voltage indicator Ruptured fuse indicator Warning refer to user manual Battery charge indicator Measuring range Ground noise vo...

Page 14: ...output voltage select button Test button Over under range indicator Output voltage indicator Ruptured fuse indicator Warning refer to user manual Battery charge indicator Measuring range Ground noise...

Page 15: ...output voltage select button Test button Over under range indicator Output voltage indicator Ruptured fuse indicator Warning refer to user manual Battery charge indicator Measuring range Ground noise...

Page 16: ...age indicator Ruptured fuse indicator Warning refer to user manual Battery charge indicator IART measurement indicator Possible Not possible Measuring range Clamp current presence indicator OK Not OK...

Page 17: ...tage indicator Ruptured fuse indicator Warning refer to user manual Battery charge indicator ART measurement indicator Possible Not possible Measuring range Clamp current presence indicator OK Not OK...

Page 18: ...ely after charging Nearly fully battery charge Some change remaining but instrument may auto power down at any time 0 battery charge remaining instrument will auto power down Note If the DET4TR2 and D...

Page 19: ...electrical circuits 2 Move the slide on the terminal panel until the external AC DC adaptor socket is exposed 3 Remove the bung from the AC DC adaptor socket 4 Connect the AC DC adaptor and switch on...

Page 20: ...the retaining screw Re enabling the battery charging circuit on the DET4TR2 and DET4TCR2 If the DET4TR2 and DET4TCR2 s rechargeable batteries are replaced with alkaline batteries the instrument may au...

Page 21: ...itch 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 b...

Page 22: ...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 I Figure 3 sc...

Page 23: ...m 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 t...

Page 24: ...by the test voltage is I V Rx R1 R2 Rn 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 t...

Page 25: ...asuring ground noise voltage 3 Set the rotary selector switch to the V position 4 The ground noise voltage reading will be displayed as shown in Figure 10 Figure 10 example ground noise voltage readin...

Page 26: ...lector 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 Two terminal resistance meas...

Page 27: ...terminal resistance reading will be displayed as shown in Figure 14 Figure 14 example two terminal resistance reading DET4 display shown Note The test voltage used to make the two terminal resistance...

Page 28: ...will be inhibited if the ground noise voltage exceeds 40 V pk pk 7 The Rc LED will flash to indicate that the instrument is carrying out pre measurement checks 8 If the Rc LED does not illuminate fol...

Page 29: ...hree terminal resistance 3 Set the rotary selector switch to the 3P position 4 Select the desired test voltage using the 25 V 50 V button 5 DET4TC2 and DET4TCR2 only Select the desired test frequency...

Page 30: ...ure 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...

Page 31: ...ndicate that the instrument is carrying out pre measurement checks 11 If the Rc LED does not illuminate following the pre measurement checks this indicates that the C stake resistance exceeds the limi...

Page 32: ...25 V 50 V 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 co...

Page 33: ...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 7 The instrument will perform pre...

Page 34: ...round current 3 Close the MCC CLAMP around the conductor under test 4 Set the rotary selector switch to the A position 5 The ground current flowing in the conductor will be displayed as shown in Figur...

Page 35: ...under test 4 Set the rotary selector switch to the 3P position 5 DET4TC2 and DET4TCR2 only Select the desired test frequency using the Hz button 6 Press and release the TEST button by holding the TES...

Page 36: ...urements made Three terminal resistance measurement with lead null using ART DET4TC2 and DET4TCR2 In certain circumstances the resistance of the test leads connecting to the electrode under test may i...

Page 37: ...strument 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 test...

Page 38: ...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 A no Stakel...

Page 39: ...instrument OFF using the selector switch 10 The instrument is now calibrated to the MCC CLAMP and the calibration stored in non volatile memory OPERATION OF THE TWO CLAMP CALIBRATION ADAPTOR 1 Ensure...

Page 40: ...ALIBRATION ADAPTOR 1 Ensure the rotary selector switch is in the OFF position 2 Connect the instrument as shown 3 Set the rotary selector switch to the 2P 3P or 4P position 4 Press and release the TES...

Page 41: ...mp 0 5 mA to 19 9 A Ground current accuracy 5 3 digits Ground voltage range 0 to 100 Vac Ground voltage accuracy 2 2 V Resistance range 0 01 to 2 k DET3TA DET3TC DET3TD 0 01 to 20 k DET4TD2 DET4TR2 0...

Page 42: ...monitoring of protective measures Part 1 General requirements Part 5 Resistance to earth Dimensions 203 mm x 148 mm x 78 mm 8 in x 5 8 in x 3 in Weight 1 kg 2 2 lb MCC CLAMP SPECIFICATIONS Measuremen...

Page 43: ...n Weight 0 5 kg approximately 1 2 lb CALIBRATION ADAPTOR ELECTRICAL SPECIFICATION Value 25 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...

Page 44: ...re for your Megger products Returning your product to Megger UK and USA service centres 1 When an instrument requires recalibration or in the event of a repair being necessary a Returns Authorisation...

Page 45: ...ment Spent alkaline or NiMH AA batteries are classified as Portable Batteries and should be disposed of in the UK in accordance with Local Authority requirements For disposal of batteries in other par...

Page 46: ...mited Unit 26 9 Hudson Avenue Castle Hill Sydney NSW 2125 Australia T 61 0 2 9659 2005 F 61 0 2 9659 2201 E ausales megger com Megger Limited 110 Milner Avenue Unit 1 Scarborough Ontario M1S 3R2 Canad...

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