Megger Limited Megger DET4TD2 4-Terminal Digital Ground Tester
Contents
1. essential to both the protection and performance of any electrical system Ground testing should be performed both upon installation to meet design specification and periodically thereafter in order to maintain service All Megger models can also perform bonding tests using an ac signal to determine that adequate connection has been made from equipment to the grounding system and can perform soil resistivity tests This additional function can be used in prospecting locating and designing new grounding electrodes and systems Furthermore the addition of built in current clamp capability enables fall of potential testing of attached grounds ART without lifting the utility connection and the addition of voltage clamp technology enables stakeless testing from the same instrument Grounding electrodes from simple to complex systems can be tested including E Primary and secondary electrical grounding systems E Utility pole grounds E Lightning protection systems E Residential grounds E Machinery safety grounds E Computer and communication system grounds EMI RFI system grounds E Antenna and pedestal grounds CATV system grounds FEATURES AND BENEFITS Stakeless testing capability which allows the operator to use the instrument like a clamp on tester in applica tions where the method is viable Attached Rod Technique capability which allows fall of potential testing without the need to disconnect the ground rod2. m Multiple user selectable test frequencies allows the operator to find the most effective frequency for making the measurement m 200 000 Q measurement range provides the ability to measure the resistivity of any type of soil m User selectable test voltage ensures that the units can be used in agricultural environments m Microprocessor control for improved error detection m Clear unambiguous warnings and error indications en sure the reliability of the reading and reduce test time E Rugged weatherproof case to IP54 makes the units truly outdoor instruments E Backlit LCD allows for testing in dark environments Noise rejection to 40 V pk to pk allows accurate testing in noisy environments Testing kits and certificates supplied everything needed to start testing immediately m Accuracy of 2 of reading enhances reliability of mea surements E Voltmeter function included allows you to measure the ground voltage and enhances operator safety m CAT IV 100V provides increased operator safety sales GlobalTestSupply com Megger SPECIFICATIONS Resistance range 0 01 to 200 kQ autoranging 0 01 to 20kQ for models DET4TD2 and DET4TR2 Resistance accuracy 2P measurements 3P measurements 4P measurements 2 3 digits ART measurements 5 3 digits Stakeless measurements 7 3 digits Maximum probe resistance DET4TD2 and DET4TR2 Rp limit 100kQ 50V output voltage Rc limit 100kQ SOV output voltage Limits reduc
3. measure resistance from 0 01 ohms to 20 kQ while the DET4TC2 and DET4TCR2 can measure resistance from 0 01 ohms to 200 kQ a key capability for soil resistivity testing Also to allow accurate testing in noisy environments the instruments are capable of rejecting noise up to 40 V peak to peak The DET4TD2 and DET4TC2 are powered by eight AA batteries which are widely available and also give excellent testing time the status of these batteries is given by a bar graph on the LCD display allowing the operator to decide when to change the batteries before they expire The DET4TR2 and DET4TCR2 are powered from rechargeable sales GlobalTestSupply com Megger AA cells The battery charger is built in and the instrument is supplied with an AC DC adapter For all instruments the battery status is displayed using a bar graph The DET4TC2 and DET4TCR2 include additional capabilities By using the optional ICLAMP the user can augment the traditional fall of potential measurement method with ART Attached Rod Technique which allows electrode testing without disconnection and also leakage current measurements down to 0 5 mA A second optional clamp the VCLAMP enables true stakeless clamp on measurements to be made in situations where driving stakes is not practical The DET4TC2 and DET4TCR2 also feature a backlit display which extends the operational environment of the instrument to cable cellars and other dark locations Finally a
4. 5 mA at 25 V Noise rejection 40V pk to pk Noise check Automatic C spike check Automatic P spike check Automatic Battery type 8 1 5 V AA cells 8 1 5 V AA NiMH rechargeable cells DET4TR2 and DET4TCR2 Battery life 3 hours 700 consecutive tests Safety EN61010 1 CAT IV 100 V Terminals 4 mm plug type test leads Ingress protection IP54 EMC Meets the requirements of EN61326 1 1998 for use in heavy industrial areas including amendment 1 Dimensions 8 x 5 7 x 3 2 in 203 x 148 x 78 mm Weight 2 2 lb G kg Operating temperature range 5 to 131 F 15 to 55 C Storage temperature range 40 to 158 F 40 to 70 C Humidity 95 RH non condensing at 104 F 40 C 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 there is insufficient space to perform a classic fall of potential measurement In addition the units can be used to measure ground leakage or phase current The user simply clamps the optional ICLAMP current clamp and VCLAMP voltage clamp around the ground under test in the manner prescribed in the operator s manual and takes the reading A defined test voltage is injected into the system using the VCLAM
5. A Trappes FRANCE Oberursel GERMANY Mumbai INDIA Johannesburg SOUTH AFRICA Aargau SWITZERLAND Chonburi THAILAND Quality Megger Products Online at www GloballestSupply com 6220 842 ISO STATEMENT Registered to ISO 9001 2000 Reg no Q 09250 Registered to ISO 14001 Reg no EMS 61597 DET4T2SERIES_ DS _ US _V05 WWww megger com Megger is a registered trademark sales GlobalTestSupply com
6. Megger DET4 Series DET4 Series Earth Ground Resistance amp Soil Resistivity Testers 4 Terminal Earth Ground Resistance and Soil Resistivity Testers DESCRIPTION Megger s popular 4 terminal ground testing instrument family includes four basic models with different kit variants for each that include select accessories for greater testing flexibility The four basic units are Model Description DET4TD2 Dry cell battery powered basic 4 terminal tester DET4TR2 Rechargeable battery powered basic 4 terminal tester DET4TC2 Dry cell battery powered 4 terminal tester with selectable test frequencies greater measurement sensitivity and attached rod technique and stakeless measurement capability DET4TCR2 Rechargeable battery powered 4 terminal tester with selectable test frequencies greater measurement sensitivity and attached rod technique and stakeless measurement capability The top end models DET4TC2 and DET4TCR2 include a current measuring function for ART Attached Rod Technique testing capabilities With this added function on site grounds can be tested separately without having to remove the utility connection as explained further in this document They also provide stakeless testing capability This method allows the operator to use the instrument like a clamp on ground tester in applications where that method is viable while also being able to operate as a fall of potential tester if required Quality Megg
7. P inducing a current I to flow and be measured by the ICLAMP The instrument then calculates the approximate resistance of the ground under test The stakeless method is subject to the same limitations faced by the traditional clamp on ground tester It is effective only in situations with multiple grounds in parallel and cannot be proofed like a fall of potential test In situations where the stakeless method reading is questionable a full fall of potential test is recommended The advantage of the DET4TC2 and DET4TCR2 is that the units include both test methods in a single instrument making them the most versatile units available sales GlobalTestSupply com Megger ART ATTACHED ROD TECHNIQUE TESTING CAPABILITY The DET4TC2 and DET4TCR2 include the additional testing capability that we have termed ART for Attached Rod Technique A nagging problem with traditional ground testing has been the requirement to lift G e disconnect the utility connection Once the grounding conductor the main conductor that connects the facility to the ground rod or grid has been attached to the erounding electrode the utility ground becomes a parallel resistance The utility neutral is typically bonded to the ground bus at the service entrance and this connection during a ground test causes test current to flow back through the utility ground as well as through the test electrode Test current divides according to Law of Parallel Resist
8. Rated 1o IP34 Hard Carry Case Included Accessories Test Leads 49 ft 33 ft 33 ft 10 ft and Spikes Certificate of Calibration Warranty 2 Yeat CONFIGURATION OPTIONS Hard carry case 4 Right angle terminal adapters Leads 49 ft 33 ft 33 ft 10 ft and Spikes Power Included Accessories Supply Model No i DET4TC2 Clamps 1000 365 DET4TC2 Kit 1000 404 DET4TCR2 Clamps 1000 366 DET4TCR2 Kit 1000 405 DET4 Series Earth Ground Resistance amp Soil Resistivity Testers DET4TD2 DET4TR2 DET4TC2 DET4TCR2 1000 347 1000 324 1000 345 1000 346 0 01 to 20 000 Q 0 01 to 200 000 Q O to 100 V ee 94 105 111 128 Hz External ac dc Field Calibrator ICLAMP and VCLAMP Earth ground kit C N 6320 245 Alkaline batteries Rechargeable Ww cD 9 2 The Professional Ground Testing Kit C N 6320 245 includes two 164 ft 50 m leads and two 98 ft 30 m leads on retractable reels four auger style ground spikes a tape measure and a separate hard carry Case NOTE Using the ICLAMP allows the operator to make ART measurements Using the ICLAMP and VCLAMP allows the operator to make stakeless clamp on measurements Quality Megger Products Online at www GlobalTestSu DpPly com _ sales GlobalTestSupply com Megger DET4 Series Earth Ground Resistance amp Soil Resistivity Testers DET4TC2 OPERATION Test lead connections at rear LCD Display Megger DET4TC2 Resistance measurement se
9. ance but the tester makes its measurement based on total current flow The reading is the combined parallel resistance of the on site ground and the utility protection This is a valid measurement but not of the test electrode exclusively This poses a considerable problem in many common testing situations If a commissioning test were required to determine if design specifications had been met for a new facility such a reading would be insufficient Lightning protection requiring a short straight path into the earth could also not be properly validated But lifting the utility connection poses several problems not the least of which is the breaking of what is often a welded bond in addition to the temporary loss of protection Clamp on ground testers which measure ground resistance by clamping around the rod and inducing a test current onto it are only a limited solution They can accurately measure resistance of a single rod in a parallel system by inducing the test current onto the clamped rod and utilizing all the parallel grounds as the return Collectively these returns typically the multiple grounds of the utility contribute little to the loop measurement This is essentially the reverse of the operation of a traditional tester which uses the current probe as the return while current goes to ground through all parallels collectively This technique solves the problem of separately measuring an attached rod but leaves t
10. ed to 50kQ for 25V output voltage Limits reduced to 5kQ for 0 01 Q resolution DET4TC2 and DET4TCR2 Rp limit 200kQ 50V output voltage Rc limit 200kQ 50V output voltage Limits reduced to 100k for 25V output voltage Limits reduced to 5kQ for 0 01 Q resolution Earth voltage range 0 100 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 Technique DET4TC2 DET4TCR2 Stakeless test DET4TC2 and DET4TCR2 Ground current range with current measuring clamp 0 5 mA to 19 9 A Ground current accuracy 5 3 digits Display DET4TD2 and DET4TR2 3 1 2 digit high contrast LCD DET4TC2 and DET4TCR2 3 1 2 digit high contrast LCD backlit 2 3 digits 2 3 digits STAKELESS CLAMP ON TESTING The DET4TC2 and DET4TCR2 include stakeless or clamp on testing capability In effect these models can be operated in the same way as a clamp on ground tester eliminating the need to disconnect the ground under test and drive test probes in certain ground system testing applications This method is also useful when ICLAMP Quality Megger Products Online at www GlobalTestSupply com DET4 Series Earth Ground Resistance amp Soil Resistivity Testers Test frequency 94 105 111 and 128 Hz 128 Hz for DET4TD2 and DET4TR2 Test voltage 25 V or 50 V user selectable factory setting 50 V Test current 450 micro amps at 25 V or 50 V selectable 4
11. er Products Online at www GloballestSupply com 2 3 and 4 point testing Stakeless clamp on testing capability ART Attached Rod Technique capability Multiple user selectable test frequencies Resistance measurement range to 200 000 IP54 rated Warning indicators prevent test failure Simple one button operation Included leads stakes calibration certificate and rugged carry case The basic kit includes the test leads stakes batteries and calibration certificate delivered in a tough polypropylene carry case everything you need to start testing in one package All models are rated to IP54 making them truly outdoor instruments They are designed to meet stringent safety standards and are rated CAT IV 100 V The ground testers have been designed to be easy to use a large selector switch makes selection of 2 3 or 4 pole tests easy with gloved hands and the design makes the fitting of shorting links to perform 2 pole tests a thing of the past A large clear easy to read LCD and thumb sized test button also make the instruments particularly well suited to the outdoor conditions of ground testing In addition to this ease of use feature the instruments automatically check the connection and conditions of the P spike C spike and also the level of ground noise indicating the status on the display They also include a voltmeter to enable measurement of ground voltage The DET4TD2 and DET4TR2 can
12. gland T 44 0 1 304 502101 F 44 0 1 304 207342 UKsales megger com s padded case UNITED STATES 4271 Bronze Way Cat No 1000 347 1000 324 1000 345 1000 365 1000 404 1000 346 1000 366 1000 405 ICLAMP 6220 824 6220 803 6280 375 250579 250581 Dallas TX 75237 1019 USA T 1 800 723 2861 USA only T 1 214 333 3201 F 1 214 331 7399 USsales megger com Item Qty Standard accessory kit hammer spikes leads 6310 755 Professional ground testing kit Cat No 2 x 50m 2 x 30m 4 auger stakes carry case 6320 245 Soil resistivity kit leads rods padded case 250586 Getting Down to Earth a Megger guide to earth testing Replacement hard carry case AVTM25 TA 5410 429 Replacement calibration check PCB two clamp measurements 6220 831 Replacement ground test stakes x2 for included kit 200mm 8mm dia 6220 804 Replacement ground test leads x4 for included kit 15m 10m 10m 3m 6220 806 Replacement auger stakes x2 for professional kit 6220 839 Replacement cable reel 50m red cable for professional kit 6220 840 Replacement cable reel 50m black cable for professional kit 6220 841 Replacement cable reel 30m green cable for professional kit 6220 843 Replacement cable reel 30m yellow cable for professional kit OTHER TECHNICAL SALES OFFICES Valley Forge USA College Station USA Taby SWEDEN Sydney AUSTRALIA Ontario CANAD
13. he problem that it cannot be proven A clamp on measurement has to be accepted on faith and its reliability is based squarely on the knowledge and experience of the operator leaving a large margin for human error In complex multiply connected grids and other grounding schemes return paths may exist that are entirely metallic not including earth at all The clamp on test current will circulate through such paths and give a reading essentially a continuity reading of the grid structure having nothing to do with soil resistance Such readings will be low and appear to the uninformed Quality Megger Products Online at www GloballestSupply com DET4 Series Earth Ground Resistance amp Soil Resistivity Testers as acceptable grounds The responsibility for making these determinations falls squarely on the operator But even when properly addressed there is no way of demonstrating the competence of the readings to a third party such as a client They must simply be accepted The ART testing capability combines the advantages of both of these technologies to produce a method that can reliably measure an attached ground and prove it A built in clamp input used in conjunction with the optional ICLAMP accessory connected below the point of separation of the parallel test currents measures only the current flowing through the test ground not that going back through the utility This current value is then used by the microproces
14. ll units have selectable 25 V or 50 V output for compliance with IEC 61557 5 The 25 V output is required for testing in agricultural environments e Model DET4TCR2 shown performing the stakeless ground testing method using only clamps APPLICATIONS Proper grounding provides many varied benefits to both people and facilities It lessens the chance of injury due to faulty installation reduces the likelihood of damage from lightning strikes and induced voltages improves the performance of computer communication and other sensitive equipment and protects against static electricity from friction Over time ground systems can degrade or become ineffective Corrosion and weather influences exert mechanical strain on ground rods and cause metallic corrosion Catastrophic events like lightning strikes or large fault currents can cause instant degradation In addition soil resistivity can change over time due to environmental conditions and facility expansion can create different ground system needs The risks from ground system deterioration include potentially deadly electrical shock situations plant wide equipment damage disruption in the performance of sensitive equipment and heat build up on a single piece of electrical equipment Quality Megger Products Online at www GlobalTestSupply com DET4 Series Earth Ground Resistance amp Soil Resistivity Testers The maintenance of an adequate low resistance ground connection is
15. sor to calculate ground resistance strictly in accordance with Fall of Potential or its derivative procedures supported by IEEE Standard 81 for proper ground testing and subject to the appropriate proofs The ART method employs leads and probes just as does any traditional tester Ground resistance can be profiled and graphed by moving the potential probe against the position of the current probe and a Fall of Potential graph Slope Method mathematical proof or any of the other proven methods utilized to demonstrate the accuracy of the test The only thing different from the operation of a familiar traditional ground tester is that the clamp permits separation of the test currents in an attached or otherwise parallel grounded system This technique enables local grounds to be tested without lifting the utility connection yet with the ease reliability and confidence of a separate commissioning test Current measuring clamp inset for ART testing capability sales GlobalTestSupply com Megger Model No Cat No 2 Pole Measurement 3 Pole Measurement 4 Pole Measurement Soil Resistivity Tests ART Attached Rod Technique Capability Stakeless Clamp on Measurement Capability Resistance Range Ground Voltage Range Ground Current Range with ICLAMP Capability SELECTION GUIDE Output Selectable Voltage 25 50 V a Test Frequency Power Supply Alkaline Batteries e Rechargeable Batteries Safety Rating CAT IV 100 V
16. ttings 25V 50V output voltage select button Selector switch Test button Frequency select button Backlight Voltage and current control button measurement settings DET4TC2 DISPLAY EXAMPLE Output Ruptured Warning refer Battery charge voltage fuse to user manual indicator Measuring range Over under range indicator Ground noise voltage Potential probe resistance Current probe resistance indicator OK or high indicator OK or high OK or high Quality Megger Products Online at www GloballestSu Dply com _ sales GlobalTestSupply com Megger Each instrument comes complete with three sets of leads two test spikes instruction manual CD and a rugged carrying case current measuring clamp shown is an optional accessory for performing the ART testing capability using the DET4TC2 and DET4TCR2 only Terminal Adapters are used to allow the DET4 Series units terminals to accept alternative cable connections Quality Megger Products Online at www GloballestSupply com DET4 Series Earth Ground Resistance amp Soil Resistivity Testers OPTIONAL ACCESSORY KITS Professional Kit Cat No 6320 245 Red and black cable reels 164 ft 50 m yellow and green cable reels 98 ft 30 m earth electrode leads 13 ft 4 m green 4 mm shrouded plug and large croc clip 4 auger style spikes molded polyethylene carrying case fiberglass measuring tape 164 ft SO m Soil Resistivi
17. ty Kit Cat No 250586 Set of four test leads 50 ft 15 m two pair of 20 in 51 cm ground rods padded case to hold instrument leads and rods Deluxe Kit Cat No 250581 Set of three color coded test leads 25 50 100 ft 8 15 30 m two 20 in 51 cm ground rods padded case to hold instrument leads and rods Standard Kit Cat No 250579 Three color coded test leads 25 50 100 ft 8 15 30 m two 20 in 51 cm ground rods canvas accessory case for leads and rods only Standard Kit Cat No 6310 755 Hammer 2 5 lb 1 13 kg four galvanized steel spikes 0 5 in 12 mm two spike extractors four leads in carrying case sales GlobalTestSupply com Megger Item Qty DET4TD2 DET4TR2 DET4TC2 DET4TC2 Clamps DET4TC2 Kit DET4TCR2 DET4TCR2 Clamps DET4TCR2 Kit See Configuration Options chart for detailed information Optional Accessories DET4 Series Earth Ground Resistance amp Soil Resistivity Testers ORDERING INFORMATION Current measuring clamp and connecting lead for ART testing method Voltage inducing clamp calibration check PCB two clamp measurements and connecting lead VCLAMP Calibration check box Right angled terminal adaptor Auxiliary 12V socket charger DET4TR2 and DET4TCR2 only set Standard accessory kit leads rods canvas accessory case for leads amp rods Deluxe accessory kit leads rod UK Archcliffe Road Dover CT17 9EN En
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