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1. 5 5 2 Assembly Details XIV Trouble shooting Install batteries correct Faulty battery polarity boli Replace the batteries batter Poor contact battery Replace the battery contacts contacts Replace with right type The instrument A break i Make a continuity test of test cannot be buttoned h Teak batery lead If there is continuity on aes replace the battery harness Departure of the POWER button Re assemble the button a contact of power Re plug or replace a plug Defect of PCB when current Defect of circuit consumption is about 100mA component or more at 6V of battery voltage Replace the PCB capacity of Replace the batteries atter Display Err big Trigger the clamp several times error results or Poor enclose of jaw 55 and then re boot results unstable T eum emen Replace the PCB component Measure in wrong steps Study the manual and follow it Replace the battery when Low are capacity DE battery mark is displayed on y the LCD Poor enclose of Jaw Trigger the clamp several times indicating jaw open and theire boot symbol on LCD Incapable Contact surface of jaw is measurement of Clean the surface polluted by dust oil etc resistance Reboot d 1 Without self calibration du DEDE Me conduct measurement
2. 3 Specifications Instrument safety IEC EN61010 1 IEC EN6010 2 032 Insulation double insulation Pollution degree class II Overvoltage category CAT 150V to ground Max 20A Degrees of protection IP30 Group equipment as per EN 60529 Ed 92 IK04 as per EN 50102 Ed 95 Dimensions LxWxH Long elliptic jaw 285mmx90mmx66mm 11x4x3 inches Round jaw 260mmx90mmx66mm 10x4x3 inches Span of Jaw Long elliptic jaw 35mm round jaw 32mm Weight including batteries Long elliptic jaw 1160g Round jaw 1120g Battery type 4 x1 5V alkaline LR6 AA battery Low battery indication is displayed Internal consumption lt 5 Auto Power off after 5 minutes of idleness Display 4 LCD sign decimal point and backlight Memory size 99 Units of Reading Environment Temperature amp Relative Humidity Working 10 C 55 C 10 RH 90 RH Storage 20 C 60 C below 70 RH Range shift Full range automatic shifting External magnetic field lt 40A m External electric field lt 1V m Data upload interface RS232 Optional 6 IV Structure of Meter 3 54 6 lt 10 lt 1 Long Pincers Jaw 65mmx32mm 2 Round Pincer Jaw 932mm 3 Trigger to control opening and closing of jaw 4 HOLD Key lock Release display Storage 5 POWER Key Boot Up Shutdown Quit Clear Data 6 MEM Key Data Access Clear Data 7 AL Alarm Function Key
3. ETCR Earth Resistance Tester ETCR2000 ETCR2000A ETCR2000C ETCR2100 ETCR2100A ETCR2100C lt gt 0 0 00 0 L MANUAL Guangzhou ETCR Electronic Technology Co Ltd CONTENT I ATenton e eee ee ee t e e c c t E ete cu tus 1 Il Brief Introdbctlor iuter tete 3 SDOGITIGHIOTE e re De Pe e e e e tt tts 5 1 Model of Series ccc scrask ca tape rept mete rey 5 2 Ranges and Accuracy of 5 SOS CHICA RR MN PUES 6 IV Structure MBIBIE cvs on wd a a Sed 7 V Liquid Crystal Display na ird 8 16 Sereni ette ere ee 8 2 Description of Special Symbols 9 3 Examples lllustrated sees 10 Function Zoom 11 Method tee tate ate oot etes 12 T BOOL Up dd eei ei teni eie tit nieto eon ee etd 12 2 13 3 Resistance Measurement 13 4 Current MBasureiTiBlE eeu euet these tote b 15 5 Date Lock Release Storage 15 6 Data ACceSS ce eee es 16 Te Alarm te etre 17 8
4. self calibration finished Defect of Check above points first If there is no problem replace the p PCB and do re adjustment circuit 35 Poor contact of LCD Re plug the LCD connect plug T connection wire or replace the plug LCD Indication Defect of LCD Replace the LCD chip of segment arithmetic Insufficient capacity of point unit and so b Replace the batteries on attery Defect of circuit Replace the PCB component HOLD button Depart Incapable to hold Re assemble the button reading Defect of circuit Replace the PCB component P 36 Manufactured by ETCR Electronic Technology Company Address F 3F No 4 Pengshang Zhifu Road Jiahe Baiyun District Guangzhou Guangdong China Post Code 510440 Tel 86 20 62199556 62199554 Fax 86 20 61100822 E mail info etcr cc Website www etcr cc
5. Read by meter then can figure out the connect resistance of oil transmission piper of tanker NOTE is the resistance meter measured R is the resistance of testing line XI Matters need attention when measuring grounding resistance 1 Users may sometimes compare ETCR with voltage current method of traditional and a big different appeal to solve the situation users should pay attention to the problem mention below 1 whether the grounding body which being measured is disconnect with earth system when use traditional way like voltage current method If not then the value is a parallel result of all the grounding body It is useless to measure the parallel result of all the grounding body because the aim why we measure the grounding resistance is compare it with a allowable value which is stipulated by relevant standards to justice whether the grounding resistance is up to standard For example the grounding resistance allowable value stipulated in GB50061 97 Design standard of overhead power line with the voltage of 66KV and below is especially for each tower The specification of the standard says that grounding resistance of each towers is a value when the grounding body and the grounding line is separated If the grounding body doesn t separate with grounding line then the grounding resistance be measured is the parallel result of several tower This standard is very specific Like w
6. Access to Alarm Critical Value 18 ce igs i v PEE 18 VIII Measurement Principle eese 18 1 Principle of Resistance Measurement 18 2 Principle of Current 19 IX Measurement Method of Earth Resistance 19 1 Multi Point Grounding System sess 19 2 Limited Point Grounding System 20 3 Single Point Grounding System 22 X Field Applicaton isi oie tritt Rt te inania 25 XI Matters need attention when measuring grounding resistance dud ni det aen AT EEATT MILD LC LC 30 XII LOAGING i e e eee ees 33 XIII Parts List and Assembly Details 33 T Parts 33 2 Assembly Details e e eee ttes 34 XIV Troubleshooting IRRRRERHRRRERRDRDSIRRHRRERER RR 35 1 Attention Thank you for purchasing this pincers earth tester from ETCR Electronic Technology Company In order to make better use of the product please be certain read this user manual carefully To comply with the operating cautions presented in this manual Under any circumstances use the Meter should pay special attention to safety Pay attention to the measurement range of the Meter and the using environment prov
7. Alarm Open Turn Off Alarm Critical Value Setting 8 Resistance Measure Switch Key Right Arrow Key 9 Current Measure Switch Key A Left Arrow Key 10 Liquid Crystal Display LCD Note is limited to C V Liquid Crystal Display 1 LCD Screen 11 10 9 8 1 Alarm Symbol 2 Symbol of low battery amp voltage 3 Symbol of full data storage 4 Symbol of data access 5 2 Digital No Of Data Storage Unit 6 Current unit 7 Resistance unit 8 Noise signal 9 Data lock symbol 10 Symbol of an open jaw 11 Symbol of DC 12 Metrication decimal point 13 4 digital LCD figures display 14 Symbol of AC 2 Description of Special Symbols Note is limited to C 1 Symbol of an open jaw As a jaw is in the open state the symbol shows At this point trigger may be artificially pressed or the jaws have been seriously polluted and can no longer continue to measure 2 Er Boot error symbol May be pressing trigger when boot or jaw has been opened 3 EF Symbol of low battery amp voltage when the battery voltage is lower than 5 3V the symbol shows At this time it cannot guarantee accuracy of the measurements Batteries should be replaced 4 OL Q symbol indicates that the measured resistance has exceeded the upper limit of the Meter 5 0 010 symbol indicates that the measured resistance has exceeded the lower limit of the Meter 6 OL A sym
8. alarm symbol also Flash Flash issued intermittent mA beep beep beep 1 9 9 9 sound Figure 13 Figure 14 Setting process press POWER key to exit Alarm Critical Value setting function return to measurement status does not change the previous settings In data access model press MEM key to exit then setting Alarm Critical Value i72 8 Access to Alarm Critical Value Press AL key to enter the mode of resistance or current measurement Press down AL key for 3 sec you can access to check the alarm critical value which would flashes in high digit The value accessed was set in the last time And again press down AL key for 3 sec or POWER key to quit from the access state and return to the measuring state D As indicated in Figure 15 the alarm critical ni e n value of resistance set in the last time is 200 9 Clear Data Figure 15 In the data access model press MEM POWER automatism clear all the stored data After clearing display show in Figure 12 The data can t be restore after clear Note is limited to Measurement Principle 1 Principle of Resistance Measurement The basic principle of ETCR in the measurement of resistance is to measure the loop resistance as shown in the figure below The jaw part of the Meter is comprised of voltage coil and current coil The voltage coil provides excitation signal and will induce a potential E on the measured loop Under the effects of the potent
9. ad line and the grounding resistance of grounding body is equal for lightning protection 2 Selection of measurement point In some grounding system like the picture show below should chose a correct point for measurement or will get different result 2 22 When ring at A point the branch a circuit the meter shows OL then should change the measuring point When measuring at B point the branch being measured i s the circuit of metallic conductor the meter shows L 0 010 or the value of resistance of metallic circuit and the value is very smell When measuring at C point the value being measured is grounding resistance of the branch XII Bill of Loading Earth Tester 1 piece Test Loop 1 piece Carrying Case 1 piece User s Manual 1 piece XIII Parts List and Assembly Details 1 Parts List NO NAME Part Quantity PCS Remark Screws of battery 1 0 01 1 M3X8 cover AA alkaline 2 DS02 4 batteries 3 Battery cover DS03 1 4 Upper shell DS04 1 5 Subjacent shell DS 05 1 6 Tension spring DS 06 2 7 Clamp DS 07 1 8 LCD DS 08 1 9 HOLD key DS09 1 10 LCD cover DS10 1 11 PCB DS11 1 Connect screws of 12 DS12 3 ST2 9X10 shells LO O E X x NN E LEE m 00 CN CN mo e z md o Egg ol 2
10. al value of test ring is 5 10 it would be normal showing 5 00 or 5 20 It shows OL indicating that the measured resistance value exceeded I n the upper limit of Meter see Figure 2 o It shows 0 010 indicating that the omm measured resistance value exceeded the lower limit of Meter see Figure 6 Flashing display symbols go with intermittent beep beep beep sound indicating the measured resistance exceeds the resistance of Alarm Critical Value In the HOLD state need to press HOLD key to exit the HOLD state then continue measurement In the MR state need to press MEM key to exit the MR state then continue to measurement In setting Alarm Critical Value state need to press the POWER key or press the AL key for 3 seconds exit Alarm Critical Value state then continue to measurement In the current test mode press key to switch to resistance test mode 14 4 Current Measurement After the booting auto inspection is completed the Meter automatically enter the resistance measurement mode Upon showing OL press A key and the Meter enter the current measurement mode showing AC 0 00 see Figure 7 At this point press the trigger and open the jaws clamp the target wire reading to get the current value It shows OL indicating CUTE that the measured current value exceeded the upper lim
11. ances of grounding bodies Rit Ry are the resistances measured with the Meter in the different grounding branches Jj It is nonlinear equations with N unknown numbers and N equations It indeed has a definite solution but it is very difficult to solve the issue artificially even impossible when N is larger Therefore you re expected to buy the Limited Point Grounding System Solution software produced by this Company Users can use the office computer or notebook computer to carry out solutions In principle in addition to ignoring the mutual resistance this method does not have the measurement error caused by neglecting However users need to pay attention to that in response to the number of the grounding bodies mutually linked in your grounding System it is necessary to measure the same number of the testing values for calculating of the program not more or less And the program would output the same number of grounding resistance values 3 Single Point Grounding System From the measuring principle ETCR series Meter can only measure the loop resistance and the single point grounding is not measured However users will be able to use a testing line very near to the earth electrode of the grounding system to artificially create a loop for testing The following presented is two kinds of methods for the single point grounding measurement by use of the Meter These two methods can be applied to the occa
12. bol indicates that the measured current has exceeded the upper limit of the Meter 7 e Alarm symbol when the measured value is greater than the critical value of alarm setting the symbol flashes and the meter issued by intermittent beep beep beep sound 8 MEM Symbol of full data storage memory is full of data units of 99 and can no longer continue to store data MEM symbol flashes 9 Symbol of access to data to display in an access to data also including the number of data 9 0 signal when the symbol flashes in the measurement of grounding resistance at a greater interference current in the loop At this time it cannot guarantee accuracy of the measurements 3 Examples Illustrated Note is limited to C 1 Jaw is in open state and cannot measure 2 Boot error instructions Er Error 3 Measured loop resistance is less than 0 010 4 Measured loop resistance is 5 10 5 Measured loop resistance is 2 10 Lock the current measurement value 2 10 Auto storage as 08 set data 6 Access to the stored data of Unit No 26 Measured loop resistance is 0 0280 wm 3 08 Q gu x12 5 UU c Bo 7 Alarm function activated the measured current exceeded 10 the critical value of alarm setting Low battery amp voltage is displayed At this time it not guarantee the accuracy of the measur
13. bove three steps the reading measured in each step is the R3 RA RC value of the two series grounding resistance In this way we can easily calculate the value of each grounding resistance From R1 RA RB R2 RB RC R3 RC RA We get RA R1 R3 R2 2 24 This is the grounding resistance value of the grounding body Ra To facilitate the memory of the above formula these three grounding bodies scan be viewed as a triangle then the measured resistance is equivalent to the value of the resistance values of the adjacent edges plus or minus resistance value of the opposite sides and divided by 2 As the reference points the grounding resistance values of the other two grounding bodies are RB R1 RA RC R3 RA X Field Application 1 Application in power system 1 The measurement of grounding resistance of the tower of transmission line Normally the tower of transmission line connect to the earth to form multi point grounding system use ETCR series clamp meter to clamp the grounding line can measure the grounding resistance of the branch circuit 2 The measurement of neutral point of transformer There are two situations for transformer to connect the grounding line iterative earth to form multi point grounding resistance single point grounding measurement for single point grounding When measuring if the meter shows L 0 010 may because there are two or more grounding line of tower or transformer connected unde
14. ements Measured current is 8 40A Lock the current value displayed Store the current value as the data Unit No 37 8 Access to the stored data unit No 8 Measured resistance is 300 This data is measured in a lot of signals interference VI Function Zoom Table Function Button On off delay shutdown POWER Lock cancel display HOLD Exit POWER Resistance current measurement data access MODE mode Lock cancel display store access alarm value SET Set critical value digital select access the data MODE SET have stored Delete all the data have stored SET MODE Note just for C type 1 VII Operating Method Boot must maintain clamp meter natural resting state don t flip Clamp don t be imposed outside force on the jaw otherwise can not guarantee the accuracy of measurement Press POWER Key to Boot first automated testing LCD show all of its symbols Figure 1 Meanwhile the instrument auto calibration after boot displayed OL automatically enter the resistance measurement mode Figure 2 If there is no normal boot self calibration instrument will show Er symbol said boot error need to check the cause and reboot Figure 3 9 Ex pe GOB Q Er Figure 1 Figure 2 Figure 3 After Power On and Self Test if not appear OL Q but shows a large 5 B Lio 12 Figure 4 resistance Figure 4 However when measured with t
15. hat have mention before the value measured by ETCR series clamp meter is the grounding resistance of each branch if the connection of grounding line is good it is the grounding resistance of one grounding body Obviously in this condition compare the result which measured by traditional voltage current method with the result measured by ETCR series clamp meter doesn t make any sense Because what have been measured is different the big different of the result is make sense 2 The grounding resistance measured by ETCR series clamp meter is comprehensive resistance of grounding branch It includes the contact resistance of the public grounding line of this branch lead line resistance and grounding body resistance Under the condition of disconnect with grounding line measured by voltage current the value is just for grounding resistance Obviously the former one is larger than the latter one The contact resistance of branch and public grounding line is what makes them different What need to specify is the grounding resistance should include the resistance of lead line which is stipulated by the national standard Terminology in DL T621 1997 The grounding of AC electric stipulated as the grounding resistance of grounding device is the total of the resistance to the ground of grounding pole or natural grounding electrodes and the resistance of grounding 34 line This kind of stipulate is specific Because the resistance of le
16. he test ring still gives the correct result indicating Clamp measured only in the high value for example more than 1000 has large errors When measuring a small resistance retains the original Accuracy the user can rest assured use 2 Shutdown Press POWER Key to Shutdown 5 minutes after boot LCD display into the blinking state To reduce battery consumption blinking state for 30 seconds automatically shut down In the blinking state press POWER key to delay shutdown Clamp continue to work In the HOLD state need to press HOLD key to exit the HOLD state then press POWER key to shut down In setting Alarm Critical Value state need to press the POWER key or press the AL key for 3 seconds exit Alarm Critical Value state then press POWER key to shut down 3 Resistance Measurement After the booting auto inspection is completed it shows OL and will be able to proceed with resistance measurement At this point press the trigger and open the jaws clamp the target loop reading to get the resistance value If the user thinks it necessary the test can be done with the ring as shown in the following figure 5 Its show value should be consistent with the normal value on the test ring 5 10 The normal value on the test ring is the 13 value at a temperature of 20 It is normal to find the difference of numerical 1 word between the show value and the nominal value For instance If the nomin
17. he data In setting Alarm Critical Value state need to press the POWER key or press the AL key for 3 seconds exit Alarm Critical Value state then can lock and storage the data Shutdown and then boot up don t lose stored data 6 Data Access Press MEM key to enter Data Access Model the default display stored in the first 01 Units of data shown in Figure 11 Then the right arrow keys up read the Figure 11 Figure 12 data stored press the left arrow key scroll down to the data stored If not store data display shown in Figure 12 In setting Alarm Critical Value state need to press the POWER 16 key or press the AL key for 3 seconds exit Alarm Critical Value state then press MEM key to enter data storage model 7 Alarm Settings In the test model press AL key to turn on or shutdown alarm function In test model press AL key for 3 seconds then enter to set alarm critical value function temporality the highest digit flashing first set a maximum bit shown in Figure 13 Figure 14 Press AL key to switch to the low number in the current digit flashing press the left right arrow keys to change the 0 1 9 figures after the number finished setting press the AL key for 3 seconds to confirm the current set alarm critical value when set the alarm function successful opening alarm function then automatically return to measurement mode If the load bigger than the alarm critical meter will be flashing an
18. ial E the current can generate on the measured 18 loop The Meter will measure E amp 1 and the measured resistance R can be obtained by the following formula 2 Principle of Current Measurement The basic principle of in the measurement of current is the same with that of the measurement of resistance as shown in the figure below The AC current on the measured measured Conductor wire through the current magnetic loop and coil can generate a induction yh current The Meter will measure l4 and the measured current can be obtained by the following formula Where is the turn ratio the secondary side vs primary side IX Measurement Method of Earth Resistance 1 Multi Point Grounding System As for the multi point grounding system such as electricity transmission tower grounding system grounding cable communications systems certain buildings etc They usually pass the overhead ground wire cable shielding layer connected to form a grounding system As the Meter is in the above measurement its equivalent electric 19 circuit is shown in the figure below Where is the target grounding resistance is the equivalent resistance of the other entire tower grounding resistances paralleled Although strictly on the theoretical grounding because of the existence of so called mutual resistance is not the usual parallel value in the se
19. ided Pay attention to the text labeled on the panel and back plane of the Meter Before booting up the trigger should be pressed for 1 2 times to ensure the jaws are well closed At Boot time DO NOT press the trigger nor clamp any wire Before the auto inspection is completed and the OL O symbols are showed the measured objects cannot be clamped on The jaw planes contact must be maintained clean and should not be polished with corrosive and rough materials Avoid any impact onto this Meter especially the Jaw contact surface This Meter will have some buzzing sound in measurement 1 10 11 12 13 14 process and it is normal The measurement current of the wire should not exceed the upper limit of the Meter Please take out the batteries in the case of the Meter being idle for a long time The dismantling calibration and maintenance the Meter shall be operated by the authorized staff If the continuing use of it would be dangerous the Meter should be stopped using immediately and immediately sealed for the treatment by the authorized agencies The contents in this user manual marked with are limited to C Brief Introduction This instrument was designed by technical department of ETCR Electronic Technology Company Its performance is mainly reflected in Breakthrough in self test the boot a long time to wait start immediately into the test Breakthrough relay self test mode u
20. it of Meter see Figure 8 Flashing display symbols e go with intermittent beep beep sound indicating the measured current exceeds the current of Alarm Critical Value In the HOLD state need to press HOLD key to exit the HOLD state then continue measurement In the MR state need to press MEM key to exit the MR state then continue to measurement In setting Alarm Critical Value state need to press the POWER key or press the AL key for 3 seconds exit Alarm Critical Value state then continue to measurement In the resistance test model press A key to switch to current test model 5 Date Lock Release Storage In test model press HOLD key to Lock currently displayed value and HOLD symbol At the same time this lock values as a 15 set of data followed by auto ID and store and then press HOLD key to cancel the lock HOLD symbol disappeared can continue to measure Loop operation can store 99 sets of data If the memory is full blinking display symbol Figure 9 Lock measured resistance 0 0160 at the same time as the first 01 sets of data storage As indicated in Figure 10 lock the measured current 278mA and save it as data unit No 99 And the memory is full now blinking display MEM symbol Figure 9 Figure 10 In the Date Access Model press MEM key to exit then can lock and storage t
21. ng jaw is particularly suitable for the occasion of grounding with the flat steel In addition Pincers Earth Tester is also able to measure the leakage current and the neutral current in the grounding system e 00000 00000 UB ial 00 125 Ill Specification 1 Model of Series Jaw Range of Range of Size Resistance Current mm Q A 2000 65x32 0 01 1200 En cd 99 Units 2000 65x32 0 01 200 99 Units Storage Alarm Function Function 2100 001 1200 99Units ETCR2100A 00 20 V 2100 0 01 1200 0 0 20 0 99 Units Note means available 2 Ranges and Accuracy of Measurement Mode Range Resolution Accuracy 50 00 99 50 1 596 0 5Q Resistance 1000490 10 Co HI 2000350 sso wo ETCR2000C 65x32 0 01 1200 0 0 20 0 99 V 400 5900 100 10 100 9000 12000 25 300 0 00mA 9 00mA 0 05mA 2 596 2mA 10 0mA 99 0mA 2 5 10mA Current 100mA 300mA 2 5 20mA True RMS 0 30 2 99 0 01 2 5 0 1A 3 0A 9 9A 2 5 0 5A 10 0A 20 0A 25 1 Resistance Measurement Frequency gt 1 2 Measured Current Frequency 50Hz 60Hz Setting Range of Resistance Alarm Critical Value 10 1990 Setting Range of Current Alarm Critical Value 1mA 499mA 5 10 5 6000 8800 20 200
22. nse of electrical engineering slightly higher than its IEC parallel output value But because a tower grounding hemisphere was much smaller than the distance between the towers and with a great number of locations after all Ro is much smaller than R Therefore it can be justified to assume Ro 0 from an engineering perspective In this way the resistance we measured should be R1 Times of comparing tests in different environments and different occasions with the traditional method proved that the above assumption is entirely reasonable 2 Limited Point Grounding System This is also quite common For example in some towers five towers are linked with each other through overhead ground wire Besides the grounding of some of the buildings is not an 20 independent grounding grid but several grounding bodies connected with each other through the wire Under such circumstances the above regarded as 0 will yield more error on the results of the measurement Due to the same reasons mentioned above we may ignore the impact of the mutual resistance and the equivalent resistance of the grounding resistance paralleled is calculated by the usual sense Thus for the grounding system of N N is smaller but larger than 2 grounding bodies it can offer N equations 5 1 1 1 T R T Ry 1 Raq Ry 1 MU p R R Where R1 R2 grounding resist
23. oad and load place Auxiliracy grounding pole pole A Grounding pole C of upload and load place As show above in system of gas station oil tank grounding pole A connect with tanker the grounding pole C of load and upload position is a independent grounding pole Find a 28 independent grounding pole as an auxiliary grounding pole B like the water piper then base on Three point method to measurement Rj Re and The grounding resistance of oil tank RA R1 R2 R3 2 The grounding resistance of load and upload place RC R2 RA The grounding resistance of auxiliary grounding pole RB R1 RA NOTE Cannot connect BC and AC by wires when measuring R4 the same as Rs The measurement of grounding resistance of tanker Testing line 2 Grounding pole C of upload and load place 2 As shows above find a grounding pole which is independent with tanker like the grounding pole of upload and load place Connect these two points by testing line read the value of by meter Then can calculate the grounding resistance of tanker NOTE RT is the value of meter RC is the grounding resistance of upload and load place 3 The measurement of connect resistance of oil transmission piper of tanker Fuel truck nozzle Flexible piper Tanker Testing line ooo Connect Fuel truck nozzle and tanker by one testing line
24. rground At this time should release the redundant 25 grounding line and just remain one 3 The application in power station power substation ETCR series clamp meter can use to test the situation of contact and connect of circuit With the help of one test line can be used to test the connect situation of equipment in station and the grounding system Single point grounding measurement is allowed for the measurement of grounding resistance 2 Application in telecommunications system 1 The measurement of the grounding resistance of machine room in the building The machine room of telecommunication system normally in the upper deck of the building and it hard to use the megohm meter to measure However it is very convenient to for ETCR Connect the fire hydrant and the pole being measured by one testing line then use the meter test the testing line The value of meter resistance of machine room the resistance of testing line the grounding resistance of fire hydrant If the grounding resistance of fire hydrant is very small then the grounding resistance of machine room value of meter resistance of testing line 2 The measurement of grounding resistance of machine room and the launch tower It normally form two point grounding system When machine room and launch tower connect to ground as show below If the value of meter is lower than the allowable value of grounding resistance
25. sing the most advanced processing algorithms and digital integration technology a fully intelligent Break the old product to heavy issues more in line with characteristics of handheld devices New design panel operation with 6 buttons better performance Anincrease of sound and light alarm beep beep beep alarm sound Increase the interference signal recognition indicator Improved anti jamming capability and test stability Stored data 99 Units Wider range 0 010 12000 Lower power consumption Maximum operating current not exceeding 50mA ETCR series of Pincers Earth Tester is widely used in the grounding resistance measurement the power telecommunications meteorology oilfield construction and the 233 industrial and electrical equipment ETCR series of Pincers Earth Tester in the measurement of a grounding system with loop current does not require breaking down the grounding wire and need no auxiliary electrode It is safe fast and simple in use ETCR series of Pincers Earth Tester can measure out the faults beyond the reach of the traditional methods and can be applied in the occasions not in the range of the traditional methods ETCR series of Pincers Earth Tester can measure the integrated value of the grounding body resistance and the grounding lead resistance ETCR series of Pincers Earth Tester is equipped with a long jaw as indicated in the figure below lo
26. sions beyond the reach of the traditional voltage current testing methods 1 Two Point Method 225 As shown in the figure below in the vicinity of the measured grounding body Ra find an independent grounding body of better grounding state Rg for example near a water pipe or a building Ra and Rg line will connect to each other using a single testing line 7 7 As the resistance value measured by the Meter is the value of the R series resistance from the testing line and two grounding resistances RL Where Rris the resistance value measured with the Meter R is the resistance value of the testing line Meter can measure out the resistance value by connecting the test lines with both ends So if the measurement value of the Meter is smaller than the allowable value of the grounding resistance then the two grounding bodies are qualified for grounding resistance 2 Three Point Method As shown in the figure below in the vicinity of the measured grounding body Ra find two independent grounding bodies of better grounding state Rg and Rc First link RA and Rg with a test line use the Meter to get the first 293 reading R4 Second have Rg and linked up as shown in the following figure Use the Meter to get the second reading Ro Third have Rc Ralinked as shown in the following figure Use the Meter to get the third reading Rs Wi 7 In the a
27. then the grounding resistance of machine room and the launch tower is valid If the value is greater than allowable value please measure by single point grounding method 3 Application in lightning protection system of building If the grounding pole of the buildings is independent with each other the measurement of grounding resistance of each grounding pole as below Lightning protection overhead lines 4 Application in gas station grounding system In the environment where full of explosive gas such as gas 2272 station oil field oil sink have to use explosion proof type Base on JJF2 2003 Grounding Type Antistatic Device Test Specification gt gt gas station mainly need to test the grounding resistance and connect resistance of the facility shows below The meter has to obey the requirement GB3836 2000 lt lt Electrical Equipments Used in Explosive Gas Environment No Item Technical Specification 1 Grounding resistance of oil tank lt 100 2 Grounding resistance of load or unload place lt 100 3 Grounding resistance of tanker lt 40 4 Connect resistance of transport flexible piper lt 50 of tanker B type has already pass the authentication of anti explosion the symbol is Exia The anti explosion qualified number is CE082010 It can be used in the environment relevant to flammable and combustible 1 The measurement of grounding resistance of tanker and upl

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