Product Manual - TelecomTest Solutions
Contents
1. For example known cable is 500 meters then certainly from the failure is less than 500 meters 500 meters is suspicious about the cable end of reflection twice length of cable is the second suspicious reflection is not the point of failure For instance if the known cable fault is mix fault then all appear as a break failure is not the real fault 2 5 4 Wave speed adjustment If the current wave speed does not match with the actual wave speed please enter into VOD menu select the type of cable or manually adjust speed directly to the appropriate values 2 5 5 Fine tuning the cursor precise positioning If that automatic calibration curse is not exactitude Press cursor movement keys to adjust the cursor location 2 5 6 Balance and gain adjustment If the current wave balance or amplitude show is not ideal Press Curr button to automatically adjust balance and gain 2 5 7 Known cable length then automatic test Set the total length of cable in the equipment and then go to Det menu Press Near button the tester will search in this range have the suspicious point in a narrow range it is easier to judge Tel 03 9023 0189 Fax 03 9700 0583 19 E info telecomtest com au W http www telecomtest com au Senter Electronic Co Ltd 2 6 Manual test When the situation is more complicated automatic test did not find the right point of failure and then need for manual testing 1 Test Range We can gradually change fr2. ccccccceceeeseeeeeeeeeneeees 21 CENE EORR UT 23 Tel 03 9023 0189 Fax 03 97000583 3 Tel 03 9023 0189 Fax 03 97000583 4 W http www telecomtest com au W http www telecomtest com au Senter Electronic Co Ltd Chapter 1 Summary 1 1 Introduction ST620 Tel Cable Fault Locator can use pulse mode or bridge mode to find the exact place where the break mix grounding bad insulation and bad connect appears on the lead sheathed cable plastic sheathed cable and flex It is an effective tool to shorten the time to find fault improve work efficiency and reduce labor intensity of line maintenance staff Lineman can also use it to inspect the line project and inspection of electrical characteristic of the cable 1 2 Features and functions e Pulse reflection test method and bridge test method can test break mixing lines insulation and other faults e Have automatic test function simply press a button to find the fault e Have manual testing function e Have mega meter and ohmmeter functions to test insulation resistance and loop resistance e Can permanently save 10 test waves result will not lost after the tester is shutdown e Using automatic gain and automatic impedance balance to replace the cumbersome potentiometer adjustment e LCD screen with backlight can test at night e Use intelligent rechargeable lithium batteries e Small size light weight and portability Tel 03 9023 0189 Fax 03 9700 0583 5
3. 1 4 Structure amp Appearance eiieeii errereen 7 A Input method when cable undivided 29 REL I e E E 7 B Input method when cable is divided 30 D uq ea E 7 3 4 Mega meter and ohm mete sssssesee 3e 1 5 Basic steps for testing the cable fault 8 3 5 Bridge test experiences usususuusss 32 1 5 1 Fault diagnosis g Ghapter4 Charge MEE oT 33 1 5 2 Choose test E T LLL g Chapter5 General troubleshooting 33 Too Faut locales E 9 APP 1 Some fault waveform often occurs 34 1 5 4 Fault point location ccc ccc ecsessssseeeeeeeeeaes 9 APP 2 Use mega meter and ohmmeter to test insulation Chapter2 Pulse test Mode 10 Circus in Ne INO E 35 21 TOS dino D e 10 Packing List 2 2 Some basic conception of pulse test mode 11 ST620 One 2 3 Pulse test interface introduce 12 Charger One 2 3 1 Range Menu ccccececcesee eee seeeee eee 13 Test line One 2 3 2 Rate Menu 13 at el 2 9 9 VOP MENU e ee ee eee R 14 2 3 4 Enter Menu esee 15 2 3 5 Main Menu cccccccccccesceeeeeeeeeeeeeeeaes 16 2 4 Pulse test wiring eeeseeeeeeeeeeees 17 ES UO NOS A E E E 17 20 Manual TES leessen iN RERA 19 2 Measurement and adjust of the VOP 21 2 8 Record Management
4. The more serious insulation fault and sometimes also use pulse test mode Pulse test mode is intuitive simple no need to cooperate at the cable end should use this mode first Bridge test mode to test the high resistance of insulation fault but need to find a good line and need a person to cooperate at the cable end the preparations for the test also cumbersome Use bridge test mode when the pulse test mode not work 1 5 3 Fault location First cut off all the connection between the fault lines and the equipment Test at the beginning of the cable to determine the minimum range and then to re testing at the scene to determine the precise location of the failure 1 5 4 Fault point location According to the testing results according to the drawing data specific find the point of fault If drawings are incomplete or misleading can estimate the general location of the fault Tel 03 9023 0189 Fax 03 9700 0583 9 E info telecomtest com au W http www telecomtest com au Senter Electronic Co Ltd according to the known cable line then according to the fault with the surrounding environment the analysis of cause of the malfunction until find the fault For example if there is a joint in the estimated range can largely judge the fault is in the joint Chapter 2 Pulse test mode Pulse test mode suit for testing break and mixed low resistance line fault 2 1 Test theory oend a pulse voltage signal to the line if
5. cable measured remotely opens the reflection waveform If the measurement of the total cable length have a difference with the actual length Press or key in VOP menu to adjust the speed until the measurement is same with actual value At this point the velocity of the cable is the actual value velocity 2 8 Record management Tester can save 10 groups test waveform for a long time 1 Enter into records management In main menu Press Reco button to enter into the waveform records management please see 2 8 1 The upper left corner of the screen symbols O means the saved waveform One of the symbols with black circle means the waveform is displayed Tel 03 9023 0189 Fax 03 9700 0583 22 E info telecomtest com au W http www telecomtest com au Senter Electronic Co Ltd Di a B 18 28 Pic 2 8 1 2 Save the current wave Enter into record management Press Save button the current test waveform into permanent preservation areas an increase in identity preservation the current time displayed in the upper left corner If the 10 preservation district has been filled up it will crowd out the first and is not locked into a wave If need to save wave we must enter into record menu and press the Save button immediately If the first look at the wave has been saved will instead the current test wave That will need to withdraw from the records management re tested to save the waveform 3 Lock the s
6. info telecomtest com au W http www telecomtest com au Senter Electronic Co Ltd impact of prominent reflection pulse for judging the point of failure It will automatic adjustment impedance balance 2 3 Pulse test interface introduce Press start button the first show is welcome interface and the current time at this time can be adjusted adjustment methods please see this chapter IX then enter into pulse test interface Pulse test using the menu interface management 5 menu name is on the bottom of the screen anti color display when be selected the corresponding 6 menu item features are in the right of the screen flashing when be selected The content displayed on the screen are test waveforms five menu and the corresponding function button on Range Rate VOP and Det and main at the top of the show are the current testing range waveform display ratio of velocity values gain value the battery capacity and memory and other symbols comparison Upper right corner of the digital waveform is dotted line cursor s distance 2 3 1 Range menu _ O Pic2 3 1 To choose test distance range Press Range button the display like 2 3 1 items are 200m 400m 1km 2km 4km 8km Press the relevant blank button to choose the test range E info telecomtest com au W http www telecomtest com au Senter Electronic Co Ltd 2 3 2 Ra
7. minute second Time 2001 06 08 16 08 16 pg Pic 2 8 2 Press Choo button to select the item need to be adjusted the selected projects will appear below as a flashing sign Press Tel 03 9023 0189 Fax 03 9700 0583 24 E info telecomtest com au W http www telecomtest com au Senter Electronic Co Ltd or to select projects to adjust For example In 2001 12 12 08 15 16 change 2001 to 2002 repeatedly press Choo to highlight it then press a key to change the 2001 to 2002 Press Cont to enter into the test procedure Chapter 3 Intelligent bridge test mode The fault resistance of poor Insulation is very high much more than the cable s surge impedance the pulse reflection is very weak and it is difficult to judge the fault point At this time we should use Bridge test mode The tester also has mega meter and ohmmeter function 3 1 Bridge test principle There must be certain resistance in the cable s centre yarn and in unit length the resistance is the same We assume that the resistance of the whole cable is H if we can test the resistance between the fault point and the other terminal is Ra and we know that the length of centre yarn is La and then we can get the following conclusion La Ra R L The centre yarn rate is changes according to the temperature and different diameters of line but the influence is the same in the range of the cable s length If we use Ra R this proportion
8. reziztanceliz2 0 L Distance Length Ei XX Length m Length Pic3 3 7 B Input method when cable is divided Sometimes the test cable is composed of several parts and different line diameters has different resistance rate users need to input the part cable s length and diameters If users use the former method the test inaccuracy will be large After test press Part the following pic3 3 8 will displays Tel 03 9023 0189 Fax 03 9700 0583 32 E info telecomtest com au W http www telecomtest com au Senter Electronic Co Ltd Pic3 3 8 In the above picture there is a 3 4 table the first line is part number 1 3 it means users can input three parts cable s data the second line is line diameters of every part the diameters can from 0 30mm to 0 99mm The third line is length of every part the length can from Om to 9999m From the test terminal users input every length of the line If there are only two parts then the third the part is 0000 There are six table can be input data press Jump users can choose the six data area the first number shines the input method of every data is the same as cable undivided After input the data press Calc the tester will get the fault distance In the part status press Part the tester can back to cable undivided interface 3 3 Mega meter and ohmmeter The bridge test mode has mega meter and ohmmeter functions it can test the insu
9. the fault exist fault input impedance Zi p Zi c is no longer the specialty resistance Zc but arising pulse reflection the reflection coefficient Zi Zc 1 Reflection voltage pulse amplitude Un p Ui Zi Zc Zi Zc Ui 2 By 1 know when the fault lines appear break Zi p 1 reflecting pulse polarity is positive in Figure 2 1 1 a When the line is short Zi O p 1 reflecting pulse polarity is negative in Figure 2 1 1 b In the actual situation the line generally is bad insulation failure the absolute value of reflection coefficient is less than 1 A Break fault waveform B Mix fault waveform Launch pulse l I I l Reflection Launch pulse rs LEN I n 5 C qp E 1 a Broken line breakdown profile b Crossed wires breakdown profile Pic 2 1 1 The time between the tester send the signal and receive pulse reflection is A t Set the fault distance as L pulse Tel 03 9023 0189 Fax 03 9700 0583 10 E info telecomtest com au W http www telecomtest com au Senter Electronic Co Ltd transmission speed in the lines as V then L VAT 2 A t will be auto record by the tester and according to the settled wave velocity V drawn from the failure L In fact when the pulse in the transmission in the cables all the different resistance such as joints reconnect point will have a reflection ST620 shows the test waveform of the cable characteristic on the screen
10. will displays insulation loop resistance13600 Tel 03 9023 0189 Fax 03 9700 0583 34 E info telecomtest com au W http www telecomtest com au Senter Electronic Co Ltd 3 5 Bridge test experiences e Users must pay more attention when use the bridge test mode users must follow the user manual in every step if finally displays Test failure users need to check every step from start to end e Users can do repeat test and compare the test result to check if the results are accordant or not if there are big difference among the test results it maybe caused by the big interfere in the line Users can retest when the line is free Chapter 4 Charge The tester adopts rechargeable Li battery when the battery icon in the screen shines and meanwhile the tester sends out sound it means that the tester low battery The tester adopts intelligent charge management when charge the tester the charge indicator always red When the battery is full the red LED on the charger will turn green It will last for five hours when charge the tester Please notice that don t use other chargers When charge the tester users can t use the tester When connect with the charger in start state the tester will shut off automatically and when charge the tester users start the tester the charge will stops automatically Tel 03 9023 0189 Fax 03 9700 0583 35 E info telecomtest com au W http www telecomtest com au Sent
11. 2 6 1 Tel 03 9023 0189 Fax 03 9700 0583 20 E info telecomtest com au W http www telecomtest com au Senter Electronic Co Ltd Pic2 6 1 7 Waveform Zoom If you want to see the details of local waveform in Comp menu Press button to enlarge the cursor around the dotted line wave Press button can be gradually restored Press RST direct return to the original 8 Cursor Zero The longer fault distance the lower resolution tests If not far from the point of failure around a joint reflection the point of failure can be measured and the distance between the joints and it is easy to sentinel First move your dotted line cursor to the pulse of the starting point for joint reflection in Det menu Press zero button cursor into a dotted line cursor and then activated the cursor movement keys the cursor will move to the dotted line fault reflection Pulse the starting point At this time showed that the value of distance to the point of failure for the joints between the distance that is the distance between the two cursor Tel 03 9023 0189 Fax 03 9700 0583 21 E info telecomtest com au W http www telecomtest com au Senter Electronic Co Ltd ekm 258 Weel iE Rang Rate Yop Das Main ALL IL JL Pic 2 6 2 2 7 Measurement and adjust of the VOP If you know the exact length of cable can use instruments to measure and calibrate the wave speed of the cable Find a good pair from the
12. E info telecomtest com au W http www telecomtest com au Senter Electronic Co Ltd 1 3 Specifications 1 3 1 Pulse test mode e Maximum range 8 km you choose the appropriate range according to the length of cable e Test blind spot 0 m e Test resolution Minimum resolution is 1 m Different resolution for different range e Pulse width 80 ns 10 u s automatic adjustment e Impedance balance automatic adjustment e Gain adjustment automatic and manual integration 1 3 2 Bridge test mode e Max testing insulation resistance 100 M O e est accuracy 1 x cable length 2m e Maximum testing cable length 9999 m e 3 parts enter can enter a diameter 0 3 mm 0 99mm 1 3 3 Others e Charging time about 5 hours e Continuous work 5 hours e Dimension 230 x 150 x 160 e Weight less than 5 Kg Tel 03 9023 0189 Fax 03 9700 0583 6 E info telecomtest com au W http www telecomtest com au Senter Electronic Co Ltd 1 4 Structure amp appearance s1620 Cable Fault Locator SHANDONG SENTERA ELECTRONIC Co LTD Pic1 4 1 Panel 1 4 1 Panel 1 4 1 e On Off Power switch of the tester e Auto Automatic test under pulse test mode e Mode Change the mode between pulse test mode and bridge test mode e Manual Pulse test mode manual test button and the bridge test mode button e 4 and gt o move your cursor keys calibrate fault distance e COM port Port to connect with the printers and communication equipm
13. Senter Electronic Co Ltd SETER ST620 Tel Cable Fault Locator Tel 03 9023 0189 Fax 03 9700 0583 E info telecomtest com au W http www telecomtest com au User Manual Senter Electronic Co Ltd Thank you for choosing Senter s cable fault locator Sincerely hope it can be a good helper on your work To make you understand the equipment and skilled use of it we ve prepared this manual In the first use of the equipment please be sure to read the whole manual to avoid unnecessary troubles This manual will change without any notice The manual content is protected by copyright Without Senter Electric Co Ltd s agreement please don t copy or disseminate any part of this manual for any purpose If you have any problem in using the instruments please contact us Thanks for your cooperation Tel 03 9023 0189 Fax 03 9700 0583 2 E info telecomtest com au W http www telecomtest com au Senter Electronic Co Ltd Senter Electronic Co Ltd Chapter3 Bridge test mode Lssseussse 24 3 1 Bridge test principle sLuuessuue 24 Contents 3 2 Bridge test interface introduction 24 Chapter Summary ces me 5 3 3 Bridge test steps sss 25 1 1 WATOGUGC NO o ERET 5 3 3 1 Connect ee 25 1 2 Features and F ncti ns cose 5 T32 TOG L 27 150 eve m 6 3 3 3 Input data and calculate 29
14. Senter Electronic Co Ltd wave and good line wave generally is the point of failure please see 2 6 1 Press the first button memory symbols change to A press the button again give up contrast the symbol memory back to A e Gain to increase gain values click one time gain will increase one e Gain to reduce gain values click one time gain will reduce one press time e Bala When the gain range conditions remain the same automatically balance impedance weakened the impulse to make the failure wave more easily to identify e Reco Click Reco to enter into the records management details see section VIII of this chapter Records management 2 4 Pulse test wiring 1 Connect test guided line test guided line plug into machines test port Please note plug on the positioning slot 2 Pulse test line connection Fault between core line connect the red clam and a black clam on the fault two core line if it is grounding Lead failure connect the clam with the ground and lead When doing pulse testing do not sue yellow clam the other two alligator clip without distinction 2 5 Auto test Generally automatic test first when the situation is more complicated automatic test results can not have correct result then switch to manual test After automatic test tester will give several suspicious point according to specific circumstances such as cable length the nature of fault etc can quickly find re
15. Users to identify the initial location of reflection pulse the shape and extent of fault test the impedance of the distance between points to determine the fault kind 2 2 Some basic conception of pulse test mode Waveform Pulse test mode performance cable status by waveform a Break fault waveform b Mix fault waveform Pic2 2 1 If the test 1 500 m of cable from the smallest automatic impedance balanced circuit will launch the pulse rate of compression is very small basically only shows reflection pulse for observation Therefore waveform 2 1 1 when testing should be the waveform 2 2 1 Calibration point of fault the starting point of reflection pulse shape 2 2 1 in the dotted line position is a fault Position The left side of the screen as the starting point for launching pulse move dotted line cursor to this point at this time the distance Tel 03 9023 0189 Fax 03 9700 0583 11 E info telecomtest com au W http www telecomtest com au Senter Electronic Co Ltd displayed on the screen is the distance from the fault When tester does auto test it can move cursor to fault reflection of the pulse starting point but sometimes need to manually that dotted the cursor position Dotted line the cursor in other locations showed that the distance has no practical meaning Test distance The max test distance of tester is 8km Automatic set is 200m after turn on the tester then gradually increase the test range
16. al fault Tel 03 9023 0189 Fax 03 9700 0583 17 E info telecomtest com au W http www telecomtest com au Senter Electronic Co Ltd 2 5 1 Auto test Press the auto button to enter into the automatic test Search range will from small to large to search every range Suspicious points in the waveform with the symbol Li marked in top right corner It will show the fault wave shape fault distance fault features of closest suspicious points Fault distance and fault feature displayed in the upper waveform right corner Figure 2 5 1 is a break fault of automatic test Screen 201 Gainge 2 5 1 Auto test for a break fault 2 5 2 Check suspicious point After the automatic testing equipment parked in Det menu and a string of symbol shows in the upper right corner found that the number of suspicious points including an anti marked that this point of a suspicious Waveform is displayed in Figure 2 5 1 If we observe a suspicious before Press Doub lt button that shows a suspicious point before the wave from the fault and fault and the nature of the same Press Doub gt button can be observed after a suspicious points Tel 03 9023 0189 Fax 03 9700 0583 18 E info telecomtest com au W http www telecomtest com au Senter Electronic Co Ltd 2 5 3 Rule out the false suspicious point In those given points some are not really the point of failure and then need to manual exclusion
17. aved waveform If a saved waveform was instead by a later saved waveform Press View lt or View Pb button turn to the wanted wave and then Press Lock button to lock the saved waveform save symbol change into If you want to stop locking you can turn this waveform Press lock keys can unlock 4 View saved waveform Press View lt or View gt button can view the saved wave the wave test also showed that time in the upper left corner Waveform of the archive can move the cursor and change the dotted line speed range and Tel 03 9023 0189 Fax 03 9700 0583 23 E info telecomtest com au W http www telecomtest com au Senter Electronic Co Ltd display can not change the proportion nor alter the gain and balance 5 Print Using the communication line and a matching micro printer are optional to connect the COM port on the tester and micro printer s serial port Press print button the screen s content will be printed 6 Exit the record management press Back button to exit the waveform records management and return to the original main menu A manual or automatic test will also exit the Records Management 2 9 Time adjust Tester has a real time clock When the welcome display comes the lower part of the screen shows the current time if the error is too large can press the time button to enter into time adjust menu See2 8 2 Time format as year month data hour
18. calculation method we can remove the influence When testing the testing will calculate the Ra R automatically and then we should input some data in order to calculate the La If the diameter of the whole cable is the same we need only input the cable s length L If the cable has many different diameters we need input part diameters and part length of the cable See details in the third part The tester adopts intelligent bridge technology users only need to connect the line well input the length part diameters etc press some keys and then the fault point will be calculated out Tel 03 9023 0189 Fax 03 9700 0583 25 E info telecomtest com au W http www telecomtest com au Senter Electronic Co Ltd 3 2 Bridge test interface introduction When on off is pressed to switch on the tester the tester will do self check press mode to enter into the bridge test interface see pic as 3 2 1 Distance Length E AX Length H000m Length Pic 3 2 1 Fault distance cable s length2xx9e is the proportion value tested by the tester automatically Ra R Cable s length exam need users to input the correct cable s length Max 9999m During the test the insulation resistance and the loop resistance will be displayed in the up of the screen See details in the part three and part four The key part are used to input the cable s length and part diameters After test and after input th
19. e Tel 03 9023 0189 Fax 03 9700 0583 39 Hundreds th Negative ousands Q polarity E info telecomtest com au W http www telecomtest com au Senter Electronic Co Ltd Pulse transmission speed of some cables me Paper pulp 0 134uF Km ET 9 Filed poiyhene EN EM om KN Tel 03 9023 0189 Fax 03 9700 0583 E info telecomtest com au W http www telecomtest com au 40 Senter Electronic Co Ltd Connection methods of Bridge test good line short connection test miil line fanlt line pairs fault point Self Mix Fault Connection coordinate terminal short connection test miil line fault point Ground Fault Connection pond line coordinate terminal short connection test mii black line fanlt line fault point Other Mix Connection Tel 03 9023 0189 Fax 03 9700 0583 41 E info telecomtest com au W http www telecomtest com au coordinate terminal Senter Electronic Co Lid Telecom Test Solutions Melbourne Australia Tel 03 9023 0189 Fax 03 9700 0583 E mail info telecomtest com au Tel 03 9023 0189 Fax 03 9700 0583 42 E info telecomtest com au W http www telecomtest com au
20. e insulation resistance dropped to a low degree several hundred to several thousand ohm below and even short circuit badly affected the quality of communication This failure could be used pulse test mode if the wave can not be identified then try bridge test mode e Bad insulation Insulating material of cable core intruded by water or moisture insulation resistance decline resulting in poor quality of communication or even blocked This failure is similar to the mix self mix and grounding fault resistance is larger more than a few thousand Ohm fault extent is lesser Usually if the insulation resistance is less than 2 trillion Ohm it will have an impact on the quality of communication need to Tel 03 9023 0189 Fax 03 9700 0583 8 E info telecomtest com au W http www telecomtest com au Senter Electronic Co Ltd exclude it This failure can not be measured by pulse test mode need to use bridge test mode When the cable have fault first use mega meter ohmmeter multimeter to determine the fault kind in order to select the appropriate testing methods According to the survey results roughly judge the failure place 1 5 2 Choose test method Resistance fault Low resistance and high resistance don t have clear boundaries Less than a few hundred to several thousand ohm we call it low resistance fault otherwise is high resistance Pulse test mode suit for testing break and mixed low resistance line fault
21. e line length press Calc we will get the fault point o Tel 03 9023 0189 Fax 03 9700 0583 26 E info telecomtest com au W http www telecomtest com au Senter Electronic Co Ltd 3 3 Bridge test steps 3 3 1 Connect with the line Poor insulation fault is divided into centre yarn toward ground poor insulation connect ground two centre yarns poor insulation self mix and poor insulation between different line pairs Before connect with the line users must have a correct judgment we will take the centre yarn toward ground poor insulation as example first e Before test confirm the fault point into a small range for example between the two Splice box We perform a test in this range and meanwhile the other terminal connects with the line Here we named the one end is test terminal the other end is coordinate terminal e Find out a centre yarn toward ground Notes it must be single line as test fault line cut the line or equipment of the two ends e find out a centre yarn toward ground Notes it must be single line as test assistance line cut the two ends or equipments the insulation resistance toward ground of the good line will be 100times than the fault line the bigger the better e In the coordinate terminal make short connect the good line and the fault line it means loop the coordinate terminal Make the yellow crocodile chip of test guide line to connect with the ground the othe
22. ent e lest port To plug the test line e Charge jack To connect with the charger e Charging instructions lights to indicate charging status e LCD screen the majority of its upper left is to display and test wave range velocity values fault distance and other information Underside and right side shows the key name e Yellow button is backlit button can use it to open the LCD backlight to see the content on the screen in the dark place e here are total 11 blank blue buttons on the underside and right side of the LCD Operate the tester with the corresponding button name Tel 03 9023 0189 Fax 03 9700 0583 T E info telecomtest com au W http www telecomtest com au Senter Electronic Co Ltd 1 4 2 Test line Red Test Clamp Test Plug Black Test Clamp Yellow Test Clamp Pic1 4 2 There are 3 clams at the end of the test line Use red clam and black clam on pulse test mode All 3 clams are used on bridge test mode The specific using methods will be introduced in the next section 1 5 Basic steps for testing the cable fault 1 5 1 Fault diagnosis Communication cable fault have the following kinds eBreak One or more cable cores break communications was interrupted Use pulse test mode to find this kind of fault eMix Divided into grounding self mix and other mix namely that the insulation shell between the cable core and the lead sheath between two pairs or between the different lines is damaged th
23. er Electronic Co Ltd Chapter 5 General troubleshooting 5 1 The phenomenon owitch on the instrument and there is nothing displayed in the screen Then adjust the contrast and there is still nothing be displayed The reason The voltage of the battery is too low The solution Charge the battery 5 2 The phenomenon There is abnormal display or the instrument is stop during the test period The reason The instrument is disturbed seriously The solution Please switch on the instrument again after Switch it off If there is difficult questions occurs please don t tear apart the tester please contact with us as soon as possible Tel 03 9023 0189 Fax 03 9700 0583 36 E info telecomtest com au W http www telecomtest com au Senter Electronic Co Ltd APP 1 Some fault waveform often occurs 1 Line mix wave downward 2 Line break wave Upward 3 Shielding layer cut 4 Induction coil Similar Similar with tne break wave with line break wave 5 Conect with ground 6 Inundate oimilar with line break wave the wave changes slowly 7 Error pairs near to the test point the first fault point will appears positive reflection and in the second fault point appears negative reflection Tel 03 9023 0189 Fax 03 9700 0583 37 E info telecomtest com au W http www telecomtest com au Senter Electronic Co Ltd 8 Distant range fault wave When the fault point is far from the test point because of the loss in
24. fault distance input method see the next part the whole test process need about 1 minute asula tions b Loop reziztancelai2 0 O Distance Length bi X Length J000m Length Pic3 3 6 3 3 3 Input data and calculate In the last step we only get the proportion value between the fault distance and cable s length users need to input the correct cable s length by manual and then users can get the fault distance Please note the cable length here means the fault range be testing in other word the length from test terminal to coordinate terminal Users can get the cable s length by check data or use this tester to measure There are differences between cable divided and cable undivided A Input method when cable undivided In the test range the cable has only one diameter For example the fault range is 986m after test input the data according to the follows In cable length20000m the first letter shines it inform you to Tel 03 9023 0189 Fax 03 9700 0583 31 E info telecomtest com au W http www telecomtest com au Senter Electronic Co Ltd input the data because the cable s length is 986m so no change at the first letter press you can change the second letter press for nine times the displays Cable s length 0900m The method is the same as before after input the data press Calc we can get the fault distance see pic3 3 7 asula tioni 6k Loop
25. lation resistance and loop resistance Tel 03 9023 0189 Fax 03 9700 0583 33 E info telecomtest com au W http www telecomtest com au Senter Electronic Co Ltd 3 4 1 Mega meter functions In the bridge test interface users can use the red or black crocodile chips with yellow crocodile chip to perform mega meter function For example users want to test the insulation resistance between some centre yarn toward ground the yellow chip connect with the ground the red or black chip connect the centre yarn need testing press manual the screen will display the test result in a short while Please see pic3 4 1 Assume the insulation resistance is 3 6 MO red crocodile chip clamp red guide line and displays R amp Y3 6M B amp Y No loop If the black chip clamp the black guide line it will display R amp Y B amp Y 3 6M No Loop See pic3 3 5 remote terminal short connection nis fellow Pic3 4 1 Mega meter connection 3 4 2 Ohmmeter function In the bridge test interface under the cooperation of red crocodile and black crocodile chip users can test the loop insulation the connection mode see 3 4 2 the remote terminal of the centre yarn need testing must be looped the two red chips connect with the two centre yarns Red chip and black chip can changes from each other press Manual the test result will displays in the up of the screen Assume the loop resistance is 13600 then the screen
26. om small to large until the cables can be saw the full length 2 Adjust the wave speed Select the type of cable in the VOD menu or on the basis of the apparatus with the speed of table speed manual adjustments 3 Test Press Manu button to manual test Press cursor keys to move your cursor to the starting point of reflection pulse If you can not see the current range of fault reflection pulse can enter into range menu to change the test range and re test 4 Gain adjustment If the reflection of the pulse amplitude too big or too small Press Gain or Gain button in the main menu increased or decreased gain value apparatus will automatically display Gain change after the wave 5 Auto impedance balance Press Bala button the instrument automatically impedance balance adjustment you can minimize the impact of firing pulse reflex pulse more easily identifiable 6 Memory contrast If it is not easy to judge reflection pulse is the point of failure or joints Fault lines pairs could be tested first and in main feature items Press Memo button the memory test under the current wave and then not to change any parameters a good test of the line re activated the Comp button The two will also display the waveform a significant difference between the two waveform of the local general is the point of failure If the two waveforms in the same place pulse reflection you can conclude that the joints Figure
27. r two crocodile chips connect with the centre yarn and fault centre yarn the red and the black chip can change but the red one must be divided from the yellow one See pic as 3 3 1 Tel 03 9023 0189 Fax 03 9700 0583 2f E info telecomtest com au W http www telecomtest com au Senter Electronic Co Ltd Red good line i L di 1 a coordinate termina X fault Tine ye uutmninn 1 XJ Tellow fault point Pic 3 3 1 Grounding fault connect line e Poor insulation of two centre yarns in the same line pair self mix and poor insulation of two different pairs other mix the only difference with the former one is the yellow crocodile chip other process is the same as before e he connection as follows see pic 3 3 2 and 3 3 3 CN El k coordinate termizal ac l zhort commection n eme line fanlt lime naire fault point Pic3 3 2 Self mix connection Red good line d uu OENEEEENN iR coordinate terminal MC T zhert connection fanlt line pairz fault point Pic3 3 3 Other mix connection e In the connection process of the bridge test users must confirm that there are no error among fault circus judgment choose good line and fault line centre yarn connection well in the coordinate Tel 03 9023 0189 Fax 03 9700 0583 28 E info telecomtest com au W http www telecomtest com au Senter Electronic Co Ltd terminal connection of three crocodile chips Otherwi
28. se the test will be failure 3 3 2 Test If theres no error in connection press manual the tester will start test The tester will measure the line insulation and loop resistance first and displays in the up of the screen see Pic3 3 4 nzulationZ 5k Loop reziztancel ids D Distance Length E AX Length J000m Length Pic3 3 4 If the coordinate terminal isn t looped the result is display the insulation resistance and No loop See pic3 3 5 In this circus we need to check the connection correct or not and retest In the pic3 3 5 R amp Y B amp Y means the three guild line Compare the two insulation resistance value we can divide the good line and the fault line Insulation resistance of good line is bigger and sometimes it will display O but the fault line s insulation resistance is much small 29 Tel 03 9023 0189 Fax 03 9700 0583 E info telecomtest com au W http www telecomtest com au Senter Electronic Co Lid Rey 3 BM Bay oc Ho Loop Distance Length E X Length 000m Length Pic 3 3 5 Tel 03 9023 0189 Fax 03 9700 0583 E info telecomtest com au W http www telecomtest com au 30 Senter Electronic Co Ltd If the connection is ok the test will continues and finally get the proportion value between fault distance and cable s length oee pic as 3 3 6 the next step is input the cable s length by manual and then we can get the
29. te menu Pic2 3 2 To change the waveform of the show a wave of horizontal zooms in and out Press change over button the screen display in Figure 2 3 2 Its function is increase and reduce and recovery In the range of 200m do not need to change display ratio 2 3 3 VOP menu Pic2 3 3 Tel 03 9023 0189 Fax 03 9700 0583 14 E info telecomtest com au W http www telecomtest com au Senter Electronic Co Ltd Choose or adjust the VOP Press VOP button the screen display in Figure 2 3 3 Its function is e Increase one to increase VOP values click one time VOP Will increase one e Reduce one to reduce VOP values click one time VOP will reduce one e Plastic plastic polyethylene cable VOP 201 m y s e Filling polyethylene filled cable VOP 192 m y s e Oil filled the oil filled cables VOP 160 m p s e Pulp Stored in a pulp filled cable VOP 216 m u s 2 3 4 Enter menu 201 kaing Rang Rate Yop Det Main Pic2 3 4 After finish the automatic test used to look up suspicious point confirm the fault Press Det the screen display in Figure 2 3 4 Its function is e Doub lt Show the front suspicious points e Doub gt Show the next suspicious points e Loca the cursor automatically re calibration fault reflection pulse starting point e Curr In the current testing range automatic impedance balance and gain adjustment and automatic calibra
30. the line the reflection pulse is very small and the start pulse is much bigger than the fault reflection pulse At this time users need to classify for example as follows line break reflection pulse of 5663m the pic as follows 9 Adapter reflection wave Normal adapter reflection pulse value is small and changes flatter or appears S shape but the fault point reflection pulse is large the start point is steep see pic as follows Tel 03 9023 0189 Fax 03 9700 0583 38 E info telecomtest com au W http www telecomtest com au Senter Electronic Co Ltd APP 2 Use mega meter and ohmmeter to test insulation circus in the line or use the mega meter and ohmmeter enrolled in the tester itself Choose suitable test method according to the insulation resistance Use the ohmmeter to test insulation resistance value below 0 1MQ Use the mega meter to test bigger resistance value Insulation Choose l Fault Polarity of resistance test Notes type pulse value mode According to the Below Negative cable s length hundreds Q m polarity exclude the false firstly if can t get the result then use bridge test mode p According to the oor era 5 bridge test insulatio 5 process in the user manual Above 5MO Good Pulse Positive Can test the line mode polarity cable s length Can t test the cable s length m but please divide Above 5MO Ie Pulse Ooty e the adapter and break mode polarity reflection puls
31. tion e Near Search within the current range of cable point failure Tel 03 9023 0189 Fax 03 9700 0583 15 E info telecomtest com au W http www telecomtest com au Senter Electronic Co Ltd According to a total length of cable to determine the largest test range then press Near button Tester will search from the smallest range 200 m to the current range This can narrow your search to reduce test time and reduce false suspicious points such as the secondary terminal reflex e Zero Press Zero the dotted line cursor position shows solid line cursor and as coordinates of O If the fault is not far away before and after joint reflection in order to determine the point of failure and the relative position of joints joint position can be set to 0 the dotted line will move your cursor over the point of failure this shows that the distance between joints and point of failure 2 3 5 Main menu O Pic2 3 5 Main control functions Generally used on the manual testing Press Main button the screen display in Figure 2 3 5 Its function is e Memo Memory of the current wave for the use of contrast Main show the upper right corner a symbols A as a memory has been marked e Comp To show that the current wave waveform and memory wave The obvious bifurcation between the fault line Tel 03 9023 0189 Fax 03 9700 0583 16 E info telecomtest com au W http www telecomtest com au
32. until can show the distance of 2000 meters Automatic test equipment will automatically change the test distance Wave speed from the section on testing in principle we know that location is actually measured in time time to be multiplied by the distance pulse velocity values it is necessary to know the exact velocity Pulse in the spread of cable known as speed velocity The pilot was informed that only the speed with the core of the cable insulation materials related For example plastic cable speed 201 m u s 201 meter per microsecond Several equipments stored the velocity of the cable can choose the method of cable set wave velocity As manufacturers and the different production technology the same types of cables may be a slight difference in velocity can be calibrated to pass the test detailed methodology see section VII of this chapter Gain Equipments magnification of the pulse reflection reverberation adjusting gain on the screen can change the amplitude of the wave the corresponding button can increase or decrease gain Reflection of the pulse amplitude transferred to close to full screen for the best Automatic test will automatic adjustment gain Impedance balance There is a internal equipment balance resistance network and by regulating the cable so that the characteristic impedance matching so as to reduce the emission pulse of the equipment to receive signals in the Tel 03 9023 0189 Fax 03 9700 0583 12 E
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