DET4 Series. 4-Terminal Earth/Ground Resistance and Soil Resistivity Testers. DET4 Series. Earth/Ground Resistance & Soil Resistivity Testers

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1 Earth/Groud Resistace & Soil Resistivity Testers DET4 Series 4-Termial Earth/Groud Resistace ad Soil Resistivity Testers 2, 3 ad 4 poit testig Stakeless (clamp-o) testig capability ART (Attached Rod Techique) capability Multiple, user selectable test frequecies Resistace measuremet rage to 200,000 Ω IP54 rated Warig idicators prevet test failure Simple oe butto operatio Icluded leads, stakes, calibratio certificate ad rugged carry case DESCRIPTION Megger s popular 4-termial groud testig istrumet family icludes four basic models with differet kit variats for each that iclude select accessories for greater testig flexibility. The four basic uits are: Model Descriptio DET4TD2 Dry-cell battery powered basic 4-termial tester DET4TR2 Rechargeable battery powered basic 4-termial tester DET4TC2 Dry-cell battery powered 4-termial tester with selectable test frequecies, greater measuremet sesitivity ad attached rod techique ad stakeless measuremet capability DET4TCR2 Rechargeable battery powered 4-termial tester with selectable test frequecies, greater measuremet sesitivity ad attached rod techique ad stakeless measuremet capability The top-ed models (DET4TC2 ad DET4TCR2) iclude a curret measurig fuctio for ART (Attached Rod Techique) testig capabilities. With this added fuctio, o-site grouds ca be tested separately without havig to remove the utility coectio (as explaied further i this documet). They also provide stakeless testig capability. This method allows the operator to use the istrumet like a clamp-o groud tester i applicatios where that method is viable, while also beig able to operate as a fall of potetial tester if required. The basic kit icludes the test leads, stakes, batteries ad calibratio certificate, delivered i a tough polypropylee carry case everythig you eed to start testig i oe package. All models are rated to IP54, makig them truly outdoor istrumets. They are desiged to meet striget safety stadards ad are rated CAT IV 100 V. The groud testers have bee desiged to be easy to use a large selector switch makes selectio of 2, 3 or 4 pole tests easy with gloved hads ad the desig makes the fittig of shortig liks to perform 2-pole tests a thig of the past. A large, clear, easy to read LCD ad thumb sized test butto also make the istrumets particularly well suited to the outdoor coditios of groud testig. I additio to this ease of use feature, the istrumets automatically check the coectio ad coditios of the P spike, C spike, ad also the level of groud oise, idicatig the status o the display. They also iclude a voltmeter to eable measuremet of groud voltage. The DET4TD2 ad DET4TR2 ca measure resistace from 0.01 ohms to 20 kω, while the DET4TC2 ad DET4TCR2 ca measure resistace from 0.01 ohms to 200 kω, a key capability for soil resistivity testig. Also, to allow accurate testig i oisy eviromets, the istrumets are capable of rejectig oise up to 40 V peak to peak. The DET4TD2 ad DET4TC2 are powered by eight AA batteries which are widely available ad also give excellet testig time the status of these batteries is give by a bar graph o the LCD display, allowig the operator to decide whe to chage the batteries before they expire. The DET4TR2 ad DET4TCR2 are powered from rechargeable

2 Earth/Groud Resistace & Soil Resistivity Testers AA cells. The battery charger is built i ad the istrumet is supplied with a AC/DC adapter. For all istrumets, the battery status is displayed usig a bar-graph. The DET4TC2 ad DET4TCR2 iclude additioal capabilities. By usig the optioal ICLAMP the user ca augmet the traditioal fall-of-potetial measuremet method with ART (Attached Rod Techique), which allows electrode testig without discoectio ad also leakage curret measuremets dow to 0.5 ma. A secod optioal clamp, the VCLAMP, eables true stakeless (clamp-o) measuremets to be made i situatios where drivig stakes is ot practical. The DET4TC2 ad DET4TCR2 also feature a backlit display, which exteds the operatioal eviromet of the istrumet to cable cellars ad other dark locatios. Fially, all uits have selectable 25 V or 50 V output for compliace with IEC The 25 V output is required for testig i agricultural eviromets. The maiteace of a adequate low resistace groud coectio is essetial to both the protectio ad performace of ay electrical system. Groud testig should be performed both upo istallatio, to meet desig specificatio, ad periodically thereafter i order to maitai service. All Megger models ca also perform bodig tests (usig a ac sigal), to determie that adequate coectio has bee made from equipmet to the groudig system, ad ca perform soil resistivity tests. This additioal fuctio ca be used i prospectig, locatig, ad desigig ew groudig electrodes ad systems. Furthermore, the additio of built-i curret clamp capability eables fall of potetial testig of attached grouds (ART) without liftig the utility coectio ad the additio of voltage clamp techology eables stakeless testig from the same istrumet. Groudig electrodes from simple to complex systems ca be tested, icludig: Primary ad secodary electrical groudig systems Utility pole grouds Lightig protectio systems Residetial grouds Machiery safety grouds Computer ad commuicatio system grouds EMI/RFI system grouds Atea ad pedestal grouds CATV system grouds Model DET4TCR2 show performig the stakeless groud testig method usig oly clamps. APPLICATIONS Proper groudig provides may varied beefits to both people ad facilities. It lesses the chace of ijury due to faulty istallatio, reduces the likelihood of damage from lightig strikes ad iduced voltages, improves the performace of computer, commuicatio ad other sesitive equipmet ad protects agaist static electricity from frictio. Over time, groud systems ca degrade or become ieffective. Corrosio ad weather iflueces exert mechaical strai o groud rods ad cause metallic corrosio. Catastrophic evets like lightig strikes or large fault currets ca cause istat degradatio. I additio, soil resistivity ca chage over time due to evirometal coditios ad facility expasio ca create differet groud system eeds. The risks from groud system deterioratio iclude potetially deadly electrical shock situatios, plat-wide equipmet damage, disruptio i the performace of sesitive equipmet ad heat build-up o a sigle piece of electrical equipmet. FEATURES AND BENEFITS Stakeless testig capability, which allows the operator to use the istrumet like a clamp-o tester i applicatios where the method is viable Attached Rod Techique capability, which allows fall of potetial testig without the eed to discoect the groud rod Multiple, user selectable test frequecies allows the operator to fid the most effective frequecy for makig the measuremet 200,000 Ω measuremet rage provides the ability to measure the resistivity of ay type of soil User selectable test voltage esures that the uits ca be used i agricultural eviromets Microprocessor cotrol for improved error detectio Clear, uambiguous warigs ad error idicatios esure the reliability of the readig ad reduce test time Rugged, weatherproof case to IP54 makes the uits truly outdoor istrumets Backlit LCD allows for testig i dark eviromets Noise rejectio to 40 V pk to pk allows accurate testig i oisy eviromets Testig kits ad certificates supplied everythig eeded to start testig immediately Accuracy of 2% of readig ehaces reliability of measuremets Voltmeter fuctio icluded allows you to measure the groud voltage ad ehaces operator safety CAT IV 100V provides icreased operator safety Test Equipmet Depot Washigto Street Melrose, MA TestEquipmetDepot.com

3 Earth/Groud Resistace & Soil Resistivity Testers SPECIFICATIONS Resistace rage: 0.01 to 200 kω autoragig (0.01 to 20kΩ for models DET4TD2 ad DET4TR2) Resistace accuracy: 2P measuremets 2% ±3 digits 3P measuremets 2% ±3 digits 4P measuremets 2% ±3 digits ART measuremets 5% ±3 digits Stakeless measuremets 7% ±3 digits Maximum probe resistace: DET4TD2 ad DET4TR2 Rp limit: 100kΩ (50V output voltage) Rc limit: 100kΩ (50V output voltage) Limits reduced to 50kΩ for 25V output voltage Limits reduced to 5kΩ for 0.01 Ω resolutio DET4TC2 ad DET4TCR2 Rp limit: 200kΩ (50V output voltage) Rc limit: 200kΩ (50V output voltage) Limits reduced to 100kΩ for 25V output voltage Limits reduced to 5kΩ for 0.01 Ω resolutio Earth voltage rage: V Earth voltage accuracy: 2% ±2 V 2-wire test: Yes, all models 3-wire test: Yes, all models 4-wire test: Yes, all models ART (Attached Rod Techique): DET4TC2, DET4TCR2 Stakeless test: DET4TC2 ad DET4TCR2 Groud curret rage (with curret measurig clamp): 0.5 ma to 19.9 A Groud curret accuracy: 5% ±3 digits Display: DET4TD2 ad DET4TR2: 3-1/2 digit high cotrast LCD DET4TC2 ad DET4TCR2: 3-1/2 digit high cotrast LCD, backlit Test frequecy: 94, 105, 111 ad 128 Hz (128 Hz for DET4TD2 ad DET4TR2) Test voltage: 25 V or 50 V, user selectable (factory settig 50 V) Test curret: 450 micro-amps at 25 V or 50 V (selectable), 4.5 ma at 25 V Noise rejectio: 40V pk to pk Noise check: Automatic C spike check: Automatic P spike check: Automatic Battery type: V AA cells (8 1.5 V AA NiMH rechargeable cells DET4TR2 ad DET4TCR2) Battery life: 3 hours, 700 cosecutive tests Safety: EN CAT IV 100 V Termials: 4 mm plug type (test leads) Igress protectio: IP54 EMC: Meets the requiremets of EN :1998 for use i heavy idustrial areas, icludig amedmet 1 Dimesios: 8 x 5.7 x 3.2 i. (203 x 148 x 78 mm) Weight: 2.2 lb (1 kg) Operatig temperature rage: 5º to +131º F (-15º to +55º C) Storage temperature rage: -40º to +158º F (-40º to +70º C) Humidity: 95% RH o-codesig at 104º F (40º C) Stadards Compliace Complies with the requiremets of KEMA K85B. Complies with the followig parts of EN61557, Electrical safety i low voltage distributio systems up to 1000 V a.c. ad 1500 V d.c. - Equipmet for testig, measurig or moitorig of protective measures. Part 1 - Geeral requiremets Part 5 - Resistace to earth STAKELESS (CLAMP-ON) TESTING The DET4TC2 ad DET4TCR2 iclude stakeless, or clamp-o testig capability. I effect, these models ca be operated i the same way as a clamp-o groud tester, elimiatig the eed to discoect the groud uder test ad drive test probes i certai groud system testig applicatios. This method is also useful whe there is isufficiet space to perform a classic fall-ofpotetial measuremet. I additio the uits ca be used to measure groud leakage or phase curret. The user simply clamps the optioal ICLAMP (curret clamp) ad VCLAMP (voltage clamp) aroud the groud uder test i the maer prescribed i the operator s maual ad takes the readig. A defied test voltage is ijected ito the system usig the VCLAMP, iducig a curret, I, to flow ad be measured by the ICLAMP. The istrumet the calculates the approximate resistace of the groud uder test. The stakeless method is subject to the same limitatios faced by the traditioal clamp-o groud tester. It is effective oly i situatios with multiple grouds i parallel ad caot be proofed like a fall-of-potetial test. I situatios where the stakeless method readig is questioable, a full fall-of-potetial test is recommeded. The advatage of the DET4TC2 ad DET4TCR2 is that the uits iclude both test methods i a sigle istrumet, makig them the most versatile uits available.

4 Earth/Groud Resistace & Soil Resistivity Testers ART (ATTACHED ROD TECHNIQUE) TESTING CAPABILITY The DET4TC2 ad DET4TCR2 iclude the additioal testig capability that we have termed ART, for Attached Rod Techique. A aggig problem with traditioal groud testig has bee the requiremet to lift (i.e., discoect) the utility coectio. Oce the groudig coductor (the mai coductor that coects the facility to the groud rod or grid) has bee attached to the groudig electrode, the utility groud becomes a parallel resistace. The utility eutral is typically boded to the groud bus at the service etrace ad this coectio, durig a groud test, causes test curret to flow back through the utility groud as well as through the test electrode. Test curret divides accordig to Law of Parallel Resistace, but the tester makes its measuremet based o total curret flow. The readig is the combied parallel resistace of the o-site groud ad the utility protectio. This is a valid measuremet, but ot of the test electrode exclusively. This poses a cosiderable problem i may commo testig situatios. If a commissioig test were required to determie if desig specificatios had bee met for a ew facility, such a readig would be isufficiet. Lightig protectio requirig a short, straight path ito the earth, could also ot be properly validated. But liftig the utility coectio poses several problems, ot the least of which is the breakig of what is ofte a welded bod, i additio to the temporary loss of protectio. Clamp-o groud testers, which measure groud resistace by clampig aroud the rod ad iducig a test curret oto it, are oly a limited solutio. They ca accurately measure resistace of a sigle rod i a parallel system by iducig the test curret oto the clamped rod ad utilizig all the parallel grouds as the retur. Collectively, these returs, typically the multiple grouds of the utility, cotribute little to the loop measuremet. This is essetially the reverse of the operatio of a traditioal tester, which uses the curret probe as the retur while curret goes to groud through all parallels collectively. This techique solves the problem of separately measurig a attached rod, but leaves the problem that it caot be prove. A clamp-o measuremet has to be accepted o faith ad its reliability is based squarely o the kowledge ad experiece of the operator, leavig a large margi for huma error. I complex, multiply coected grids ad other groudig schemes, retur paths may exist that are etirely metallic, ot icludig earth at all. The clamp-o test curret will circulate through such paths ad give a readig, essetially a cotiuity readig of the grid structure havig othig to do with soil resistace. Such readigs will be low, ad appear to the uiformed as acceptable grouds. The resposibility for makig these determiatios falls squarely o the operator. But eve whe properly addressed, there is o way of demostratig the competece of the readigs to a third party, such as a cliet. They must simply be accepted. The ART testig capability combies the advatages of both of these techologies to produce a method that ca reliably measure a attached groud, ad prove it! A built-i clamp iput, used i cojuctio with the optioal ICLAMP accessory, coected below the poit of separatio of the parallel test currets, measures oly the curret flowig through the test groud, ot that goig back through the utility. This curret value is the used by the microprocessor to calculate groud resistace, strictly i accordace with Fall of Potetial or its derivative procedures, supported by IEEE Stadard 81 for proper groud testig, ad subject to the appropriate proofs. The ART method employs leads ad probes just as does ay traditioal tester. Groud resistace ca be profiled ad graphed by movig the potetial probe agaist the positio of the curret probe, ad a Fall of Potetial graph, Slope Method mathematical proof, or ay of the other prove methods utilized to demostrate the accuracy of the test. The oly thig differet from the operatio of a familiar, traditioal groud tester is that the clamp permits separatio of the test currets i a attached or otherwise parallel-grouded system. This techique eables local grouds to be tested without liftig the utility coectio, yet with the ease, reliability ad cofidece of a separate commissioig test. Curret measurig clamp (iset) for ART testig capability Test Equipmet Depot Washigto Street Melrose, MA TestEquipmetDepot.com

5 Earth/Groud Resistace & Soil Resistivity Testers SELECTION GUIDE Model No. DET4TD2 DET4TR2 DET4TC2 DET4TCR2 Cat. No Pole Measuremet 3-Pole Measuremet 4-Pole Measuremet Soil Resistivity Tests ART (Attached Rod Techique) Capability Stakeless (Clamp-o) Measuremet Capability Resistace Rage 0.01 to 20,000 Ω 0.01 to 200,000 Ω Groud Voltage Rage Groud Curret Rage (with ICLAMP) Capability 0 to 100 V 0.5 ma to 19.9 A Output Selectable Voltage (25/50 V) Test Frequecy 128 Hz 94, 105, 111, 128 Hz Power Supply Alkalie Batteries Rechargeable Batteries Noise Rejectio 40 V Peak-to-Peak Safety Ratig CAT IV 100 V Igress Protectio Rated to IP54 Hard Carry Case Icluded Accessories Test Leads (49 ft, 33 ft, 33 ft, 10 ft) ad Spikes Certificate of Calibratio Warraty 2 Year CONFIGURATION OPTIONS Icluded Accessories Power Supply Model No. Cat. No. Hard carry case 4 Right-agle termial adapters Leads (49 ft, 33 ft, 33 ft, 10 ft) ad Spikes Exteral ac/dc Adapter Field Calibrator ICLAMP ad VCLAMP Earth/groud kit, C/N Alkalie batteries Rechargeable batteries DET4TC2+Clamps DET4TC2+Kit DET4TCR2+Clamps DET4TCR2+Kit *The Professioal Groud Testig Kit (C/N ) icludes two 164 ft (50 m) leads ad two 98 ft (30 m) leads o retractable reels, four auger-style groud spikes, a tape measure ad a separate hard carry case. NOTE: Usig the ICLAMP allows the operator to make ART measuremets. Usig the ICLAMP ad VCLAMP allows the operator to make stakeless (clamp-o) measuremets.

6 Earth/Groud Resistace & Soil Resistivity Testers DET4TC2 OPERATION Test lead coectios (at rear) LCD Display Resistace measuremet settigs 25V / 50V output voltage select butto Test butto Selector switch Frequecy select butto Backlight cotrol butto Voltage ad curret measuremet settigs DET4TC2 DISPLAY EXAMPLE Output voltage idicator Ruptured fuse idicator Warig - refer to user maual Battery charge idicator Measurig rage Over/uder rage idicator Potetial probe resistace idicator (OK or high) Curret probe resistace (OK or high) Groud oise voltage idicator (OK or high) Test Equipmet Depot Washigto Street Melrose, MA TestEquipmetDepot.com

7 Earth/Groud Resistace & Soil Resistivity Testers OPTIONAL ACCESSORY KITS Professioal Kit Cat. No Red ad black cable reels, 164 ft (50 m); yellow ad gree cable reels, 98 ft (30 m); earth electrode leads, 13 ft (4 m) gree; 4 mm shrouded plug ad large croc clip; 4 auger-style spikes; molded polyethylee carryig case; fiberglass measurig tape, 164 ft (50 m) Each istrumet comes complete with three sets of leads, two test spikes, istructio maual CD, ad a rugged carryig case, (curret measurig clamp, show, is a optioal accessory for performig the ART testig capability usig the DET4TC2 ad DET4TCR2 oly.) Soil Resistivity Kit Cat. No Set of four test leads, 50 ft. (15 m); two pair of 20 i. (51 cm) groud rods; padded case to hold istrumet, leads ad rods Termial Adapters are used to allow the DET4 Series uits termials to accept alterative cable coectios. Deluxe Kit, Cat. No Set of three color-coded test leads, 25, 50, 100 ft. (8, 15, 30 m); two 20-i. (51 cm) groud rods; padded case to hold istrumet, leads ad rods Stadard Kit, Cat. No Three color-coded test leads, 25, 50, 100 ft. (8, 15, 30 m); two 20-i. (51 cm) groud rods; cavas accessory case for leads ad rods oly Stadard Kit Cat. No Hammer, 2.5 lb (1.13 kg); four galvaized steel spikes, 0.5 i. (12 mm); two spike extractors; four leads i carryig case

8 Earth/Groud Resistace & Soil Resistivity Testers ORDERING INFORMATION Item (Qty) Cat. No. Item (Qty) Cat. No. DET4TD DET4TR DET4TC DET4TC2+Clamps DET4TC2+Kit DET4TCR DET4TCR2+Clamps DET4TCR2+Kit See Cofiguratio Optios chart for detailed iformatio Optioal Accessories Curret measurig clamp ad coectig lead for ART testig method ICLAMP Voltage iducig clamp, calibratio check PCB (two-clamp measuremets) ad coectig lead VCLAMP Calibratio check box Right agled termial adaptor set Auxiliary 12V socket charger (DET4TR2 ad DET4TCR2 oly) Stadard accessory kit (leads, rods, cavas accessory case for leads & rods) Deluxe accessory kit (leads, rods, padded case) Stadard accessory kit (hammer, spikes, leads) Professioal groud testig kit (2 x 50m, 2 x 30m, 4 auger stakes, carry case) Soil resistivity kit (leads, rods, padded case) Gettig Dow to Earth a Megger guide to earth testig AVTM25-TA Replacemet hard carry case Replacemet calibratio check PCB (two-clamp measuremets) Replacemet groud test stakes (x2) for icluded kit (200mm, 8mm dia) Replacemet groud test leads (x4) for icluded kit (15m, 10m, 10m, 3m) Replacemet auger stakes (x2) for professioal kit Replacemet cable reel (50m, red cable) for professioal kit Replacemet cable reel (50m, black cable) for professioal kit Replacemet cable reel (30m, gree cable) for professioal kit Replacemet cable reel (30m, yellow cable) for professioal kit Washigto Street Melrose, MA Phoe Toll Free Visit us at ISO STATEMENT Registered to ISO 9001:2000 Reg o. Q Registered to ISO Reg o. EMS DET4T2SERIES_DS_US_V05 Megger is a registered trademark

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