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ETCR ETCR2000E Plus, Manual

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ETCR ETCR2000E Plus Manual Download Page 30

-26- 

 

As the resistance value measured by the Meter is the value of the 

series  resistance  from  the  testing  line  and  two  grounding  resis-

tances. 

R

T

=R

A

 + R

B 

+ R

L

 

Where: R

T 

is the resistance value measured with the Meter. 

  R

L

  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 al-

lowable 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  R

A,

  find  two  independent  grounding  bodies  of 

better grounding state R

B 

and R

C. 

First, link R

A 

and R

B

 with a test line; use the Meter to get the first 

reading R

1

. 

 

 

 

 

 

 

 

 

 

Summary of Contents for ETCR2000E Plus

Page 1: ......

Page 2: ......

Page 3: ...eter 9 V Liquid Crystal Display 10 1 LCD Screen 10 2 Description of Special Symbols 10 3 Examples Illustrated 12 VI Function Zoom Table 14 VII Operating Method 14 1 Boot up 14 2 Shutdown 15 3 Resistance Measurement 16 4 Current Measurement 17 5 Date Lock Release Storage 18 6 Data Access 19 7 Alarm Settings 19 8 Access to Alarm Critical Value 20 9 Clear Data 20 ...

Page 4: ...Method of Earth Resistance 22 1 Multi Point Grounding System 22 2 Limited Point Grounding System 23 3 Single Point Grounding System 25 X Field Application 28 Ⅺ Matters need attention when measuring grounding resistance 33 Ⅻ Bill of Loading 35 XIII Parts List and Assembly Details 35 1 Parts List 35 2 Assembly Details 37 XIV Trouble shooting 37 ...

Page 5: ... environment provided 3 Pay attention to the text labeled on the panel and back plane of the Meter 4 Before booting up the trigger should be pressed for 1 2 times to ensure the jaws are well closed 5 At Boot time DO NOT press the trigger nor clamp any wire 6 Before the auto inspection is completed and the OL Ω sym bols are showed the measured objects cannot be clamped on 7 The jaw planes contact m...

Page 6: ...ut the batteries in the case of the Meter being idle for a long time 12 The dismantling calibration and maintenance the Meter shall be operated by the authorized staff 13 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 ...

Page 7: ...ns suitable for a wide place 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 using the most ad vanced 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 ...

Page 8: ...resistance measurement of the power telecommunications meteorology oilfield construction and the 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 ...

Page 9: ... 5 as indicated in the figure below A long jaw is particularly suitable for the occasion of grounding with the flat steel ...

Page 10: ...Ω 0 01Ω 1 0 01Ω 1 0Ω 49 9Ω 0 1Ω 1 0 1Ω 50 0Ω 99 5Ω 0 5Ω 1 5 0 5Ω 100Ω 199Ω 1Ω 2 1Ω 200Ω 395Ω 5Ω 5 5Ω 400 590Ω 10Ω 10 10Ω 600Ω 880Ω 20Ω 20 20Ω 900Ω 1200Ω 30Ω 25 30Ω Current 0 00mA 9 95mA 0 05mA 2 5 2mA 10 0mA 99 0mA 0 1mA 2 5 5mA 100mA 300mA 1mA 2 5 20mA 0 30A 2 99A 0 01A 2 5 0 1A 3 0A 9 9A 0 1A 2 5 0 3A 10 0A 19 9A 0 1 A 2 5 0 5A 20 0A 40 0A 0 1 A 3 1A 3 Specifications Resistance Range 0 01Ω 1200Ω...

Page 11: ...e 1 199Ω Current 1 499mA Power Supply DC 6V 4 PCS of LR6 Alkaline batteries continuously working for 40 hours Working Tempera ture and Humidity 20 55 10 RH 90 RH LCD Screen 4 Digits LCD display Screen L W 47mm 28 5mm Clamp Size Long Pincers Jaw 65mm 32mm Round Pincer Jaw Φ32mm Open jaw size Long Pincers Jaw 28mm Round Pincer Jaw Φ32mm Tester Weight Long Pincers Jaw 1160g Round Pincer Jaw 1120g inc...

Page 12: ...imen sion CT clamp Shift Automatically External magnet electric field 40A m 1V m Time for single measurement 0 5 second Frequency for re sistance test 1KHz Frequency for cur rent test 50 60Hz automatic identification ...

Page 13: ...f jaw 4 HOLD Key lock Release display Storage 5 ON OFF Key Boot Up Shutdown Quit Clear Data 6 MEM Key Data Access Clear Data 7 AL Alarm Function Key Alarm Open Turn Off Alarm Critical Value Setting 8 Resistance Measure Switch Key Ω Right Arrow Key 9 Current Measure Switch Key A Left Arrow Key 10 Liquid Crystal Display LCD ...

Page 14: ...l 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 Symbol of an open jaw As a jaw is in the open state the ...

Page 15: ... that the measured resistance has exceeded the lower limit of the Meter OL A symbol indicates that the measured current has ex ceeded the upper limit of the Meter 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 MEM Symbol of full data storage memory is full of data units of 99 and ...

Page 16: ...esistance is 2 1Ω Lock the current measurement value 2 1Ω Auto storage as 08 set data Access to the stored data of Unit No 26 Measured loop resistance is 0 028Ω Alarm function activated the measured current exceeded the critical value of alarm setting Low battery voltage is displayed At this time it not guarantee the accuracy of the measurements Measured current is 8 40A Lock the current value dis...

Page 17: ... 13 Store the current value as the data Unit No 37 Access to the stored data unit No 8 Measured resistance is 30Ω This data is measured in a lot of signals interference ...

Page 18: ...d 1 Boot up Boot DO NOT press the trigger don t open jaws nor clamp any wire Boot complete show OL Ω then press the trigger open jaws clamp the measured wire Before booting up the trigger should be pressed for a couple of times to ensure the jaws are well closed Boot must maintain clamp meter natural resting state don t flip Clamp don t be imposed outside force on the jaw otherwise cannot guarante...

Page 19: ...ple more than 100Ω has large errors When measuring a small resistance retains the original Accuracy the user can rest assured use 2 Shutdown Press ON OFF 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 ON OFF key to delay shut down Clamp continue to work In the H...

Page 20: ...ng is the value at a temperature of 20 C It is normal to find the difference of numerical 1 word between the show value and the nominal value For instance If the nominal value of test ring is 5 1Ω it would be normal showing 5 0Ω or 5 2Ω Figure 5 It shows OL Ω indicating that the measured resistance value exceeded the upper limit of Meter see Figure 2 It shows L0 01Ω indicating that the measured re...

Page 21: ...sistance measurement mode Upon showing OL Ω press A key and the Meter enter the current measurement mode showing AC 0 00mA 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 A indicating that the measured current value exceeded the upper limit of Meter see Figure 8 Flashing display symbols go with intermittent beep beep...

Page 22: ...LD symbol disappeared can continue to measure Loop operation can store 99 sets of data If the memory is full blinking display MEM symbol Figure 9 Lock measured resistance 0 016Ω 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 In the Date Access Model...

Page 23: ...model press AL key to turn on or shutdown alarm func tion 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 sett...

Page 24: ...down AL key for 3 sec or ON OFF key to quit from the access state and re turn to the measuring state As indicated in Figure 15 the alarm critical value of resistance set in the last time is 20Ω 9 Clear Data In the data access model press MEM ON OFF automatism clear all the stored data After clearing display show in Figure 12 The data can t be restore after clear 10 Data Upload Turn on the instrume...

Page 25: ... 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 potential E the current I can generate on the measured loop The Meter will measure E I and the measured resistance R can be obtained by the following formula 2 Princip...

Page 26: ...ty trans mission 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 circuit is shown in the figure below Where R1 is the target grounding resistance R0 is the equivalent resistance of the other entire...

Page 27: ...roved that the above as sumption 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 inde pendent grounding grid but several grounding bodies connected with each other through the wire Under such circumstances the abov...

Page 28: ...cially 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 solu tions In principle in addition to ignoring the mutual resistance this me thod does not have the measurement error caused by neglecting R0 However users need to pay attention to...

Page 29: ...ers 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 occasions beyond the reach of the traditional voltage current testing methods Two Point Method As shown in the ...

Page 30: ...sistance value by connecting the test lines with both ends So if the measurement value of the Meter is smaller than the al lowable 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 RB...

Page 31: ...n 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 This is the grounding resistance value of the grounding body RA To facilitate the memory of the above formula these three groun ding bodies scan be viewed as a triangle then the measured re sistance is equivalent to the value of the resistance values of the adjacent edges ...

Page 32: ...e earth to form multi point grounding resis tance single point grounding measurement for single point groun ding When measuring if the meter shows L 0 01Ω may because there are two or more grounding line of tower or transformer con nected underground At this time should release the redundant grounding line and just remain one 3 The application in power station power substation ETCR series clamp me...

Page 33: ...sistance of fire hydrant If the groun ding 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 th...

Page 34: ...eed to test the grounding re sistance and connect resistance of the facility shows below The meter has to obey the requirement of GB3836 2000 Electrical Equipments Used in Explosive Gas En vironment No Item Technical Specification 1 Grounding resistance of oil tank 10Ω 2 Grounding resistance of load or unload place 10Ω 3 Grounding resistance of tanker 4Ω 4 Connect resistance of transport flexible ...

Page 35: ...tion is a independent grounding pole Find a inde pendent grounding pole as an auxiliary grounding pole B like the water piper then base on Three point method to mea surement R1 R2 and R3 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 wh...

Page 36: ... by testing line read the value of RT by meter Then can calculate the grounding resistance of tanker R RT RC NOTE RT is the value of meter RC is the grounding resis tance of upload and load place 3 The measurement of connect resistance of oil transmission piper of tanker Connect Fuel truck nozzle and tanker by one testing line Read RT by meter then can figure out the connect resistance of oil tran...

Page 37: ... stipulated by relevant standards to justice whether the grounding resistance is up to standard For example the grounding resistance allowable value stipu lated 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...

Page 38: ...d public grounding line is what makes them different What need to specify is the grounding resistance should in clude 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 de vice is the total of the resistance to the ground of grounding pole or natural grounding electrod...

Page 39: ...g at C point the value being measured is groun ding resistance of the branch Ⅻ Bill of Loading Earth Tester 1 piece Test Loop 1 piece RS232 Com cable 1 pc Software Disk 1 disk Carrying Case 1 piece User Manual Warranty card Certification 1 copy XIII Parts List and Assembly Details 1 Parts List NO NAME Part Quantity PCS Remark 1 Screws of battery cover DS01 1 M3X8 2 AA alkaline batte ries DS02 4 3 ...

Page 40: ...CD DS 08 1 9 HOLD key DS09 1 10 LCD cover DS10 1 11 PCB DS11 1 12 Connect screws of shells DS12 3 ST2 9X10 13 Clamp screws DS13 2 ST2 9X25 14 Shaft DS14 1 15 Push button DS15 5 16 Screws for PCB fix DS16 2 ST2 2X6 17 Screws for LCD fix DS17 2 ST2 2X6 ...

Page 41: ...ble shooting Symptoms Possible Causes Remedies The instrument cannot be buttoned on No batteries Set the batteries Faulty battery polarity Install batteries in correct po larity Insufficient capacity of battery Replace the batteries ...

Page 42: ...g steps Study the manual and follow it Incapable mea surement of resis tance Insufficient capacity of battery Replace the battery when Low battery mark is displayed on the LCD Poor enclose of jaw indicating jaw open symbol on LCD Trigger the clamp several times and then re boot Contact surface of jaw is polluted by dust oil etc Clean the surface Without self calibration before test Re boot follow ...

Page 43: ......

Page 44: ... 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 62199550 E mail info etcr cc Website www etcr cc ...

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