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Ceyear 6419 User Manual

Distributed optical fiber strain tester
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6419 Distributed Optical Fiber Strain Tester
User Manual
China Electronics Technology Instruments Co., Ltd

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Summary of Contents for Ceyear 6419

  • Page 1 6419 Distributed Optical Fiber Strain Tester User Manual China Electronics Technology Instruments Co., Ltd...
  • Page 2 January 2018...
  • Page 3 Foreword Thank you very much for choosing and using the 6419 distributed optical fiber strain tester produced by China Electronics Instrument Co., Ltd. The company produces high-grade, high-precision and advanced products, with the highest quality cost-effectiveness among similar products. We always comply with the ISO9000 standard during the production process, and we’re customer-oriented and consider the quality as the enterprise's life.

  • Page 4: Table Of Contents

    Table of Contents Safety requirements ..............................1 Safety terms used in this manual ..........................1 Warnings for the use of instrument ..........................2 Notes for the use of instrument ...........................3 Maintenance and service.............................3 Calibration requirements ............................4 Warranty and repair of instrument ..........................4 Chapter I Overview ..............................5 1 Overview ofinstrument ............................5 2 Components of instrument ..........................6 2.1 Basic components ..........................6...
  • Page 5 2.13 Continuous test ..........................23 2.14 Time interval ............................23 2.15 Autosave ............................24 2.16 File serial number ..........................24 2.17 File type ............................24 2.18 Autosave path ...........................24 3 Description on operation of test condition interface ..................25 3.1 Description of operation of input box ....................25 3.2 Description of operation of drop-down box ..................25 Chapter IV Description of Window Display ......................27 1.
  • Page 6 1.4 Turn off the instrument ........................57 2 Test operation..............................58 2.1 Strain distribution test of fiber......................58 2.2 Loss distribution test of fiber......................59 2.3 Brillouin spectrum test of fiber ......................60 2.4 Brillouin spectral width test .......................60 2.5 Fiber length test ..........................61 2.6 Continuous test of fiber strain ......................62 3 Visible red light fault location (VFL) function ....................63 4 File management............................63 4.1 Open the data file ..........................64...
  • Page 7 8 Status Bar and Quick Access Toolbar ......................91 8.1 Status Bar ............................91 8.2 Quick Access Toolbar .........................91 Appendix B 6419 Remote Control Command Set ....................93 Appendix C 6419 Ordering Information ........................97 Appendix D Identification of FC/APC from FC/UPC and Jumper Connection ............98 1 FC/APC and FC/UPC Optical Fiber Connector ....................98...

  • Page 8: Safety Requirements

    Safety requirements The following general safety precautions must be taken at any stage of operating the instrument. Failure to take these safety precautions or to follow the warnings and precautions described elsewhere in this manual will violate the safety standards for the design, manufacture, and use of the instrument. China Electronics Technology Instruments Co., Ltd assumes no responsibility for the consequences arising from users’...

  • Page 9: Warnings For The Use Of Instrument

    (3) It is absolutely not allowed to connect the fiber interface that does not match the optical interface of the 6419 distributed optical fiber strain tester to the test port of the 6419 distributed optical fiber strain tester. This will not only increase the insertion loss due to the mismatched optical interface and result in no inaccurate test results, but will also cause permanent damage to the optical interface.

  • Page 10: Notes For The Use Of Instrument

    Notes for the use of instrument LCD display (1) Do not use a sharp object to click on the LCD screen, and do not impact the LCD screen Caution! with big power. This will damage the LCD screen. (2) Do not drop or splash organic solvents or contaminants on the LCD screen, such as acetone, oil, antifreeze, grease, etc., otherwise the LCD screen will not work properly.

  • Page 11: Calibration Requirements

    You should determine the appropriate calibration period based on your needs. In the case of normal use of the instrument, it is recommended that the 6419 distributed optical fiber strain tester be calibrated once a year. For details, please call the service number.

  • Page 12: Chapter I Overview

    Chapter I Overview 1 Overview of instrument The 6419 distributed optical fiber strain tester (hereinafter referred to as 6419 BOTDR can test the strain distribution, loss distribution and Brillouin scattering spectrum of fiber optic cable simultaneously. It can simultaneously display the 3D and multiple distribution parameters, and has the advantages of high strain test accuracy, good repeatability and single-ended non-destructive testing, which is an indispensable test instrument in the field of Optical Fiber Communications and Optical Fiber Sensing.

  • Page 13: Components Of Instrument

    Chapter I Overview 2 Components of instrument 2.1 Basic components The basic components of the 6419 BOTDR are shown in Table 1-1. Table 1-1 Basic components of 6419 BOTDR ITEM Name Host 6419 distributed optical fiber strain tester Power cord...
  • Page 14 Chapter I Overview Table 1-3 Descriptions of the functions of each part of the front panel Name Function description Remarks When the power is off, the indicator is off; when the power is on (1) Power indicator but the instrument is not turned on, the indicator is orange; when the instrument is turned on, the indicator is green.

  • Page 15: Viewof Instrument Back Panel

    3.1.4 Description of menu button functions The menu button corresponds to the function menu button on the right side of the 6419 BOTDR software interface. If you want to execute the menu item of the function menu being displayed on the software interface, just press the menu button of its corresponding position.
  • Page 16 Chapter I Overview Used to connect USB devices such as USB keyboard, USB mouse, and USB USB interface flash drive. Headphone jack Used to connect to headphones. Power switch Used to turn the power of the instrument on/off. Power interface Used to connect the power cord.

  • Page 17: Chapter Ii Description Of Operation Interface

    Figure 2-1 Schematic diagram of the main operation interface The operation interface of 6419 BOTDR instrument is divided into six areas: (1) Test result area, (2) Test condition area, (3) Waveform operation area, (4) Sub-waveform window, (5) Function menu area and (6) Window display area, the specific information is described as below.

  • Page 18: Sub-Waveform Window

    Chapter II Description of Operation Interface “Description of Window Display”) . 1.4 Sub-waveform window When the window display area is in the "strain distribution" state, the "spectral width distribution" state, the "loss distribution" state, and the "comprehensive loss" state, the sub-waveform window displays the Brillouin spectrum curve on the cursor of the global curve or curve of the measurement curve according to the setting of the [Sub.Wave] function button in the main function menu.
  • Page 19 [Test condition]: After entering the test condition setting interface shown in Figure 2-4, the measurement conditions and parameters related to the 6419 BOTDR measurement process can be set, and the function menu area will display the test condition sub-menu (for details, see "Chapter III Description of Test Conditions").
  • Page 20 Figure 2-7 Interface of opening file [System]: The function menu area will display the system sub-menu (as shown in Figure 2-8). The 6419 BOTDR system function can be used and set according to the menu function provided (for details, see “Chapter VII Description of System Menu”).
  • Page 21 Chapter II Description of Operation Interface spectrum” state, the sub-waveform window only displays the global strain curve (for details, see “Chapter IV, Section 2, Description of Sub-waveform Window”. Figure 2-9 Sub-waveform window...

  • Page 22: Chapter Iii Description Of Test Conditions

    Chapter III Description of Test Conditions Chapter III Description of Test Conditions Press the [Test condition] button to enter the test condition setting interface. As shown in Figure 3-1, the window display area displays the test condition setting interface, and the function menu area displays the test condition sub-menu.

  • Page 23: Pulse Width

    Chapter III Description of Test Conditions Figure 3-2 Range setting interface 2.2 Pulse width The instrument can be set to 10, 20...200ns with an increment of 10ns, there are 20 pulse widths to choose from, which can be selected by touch screen or mouse, or can be selected by “↑” or “↓” on the navigation keys. As shown in Figure 3-3.

  • Page 24: Resolution

    Chapter III Description of Test Conditions is increased to a certain extent, the effect of suppressing noise will no longer be obvious, and the test time will increase greatly, so the average times should not be too large. The default value of the instrument is 2 Figure 3-4 Setting interface of average times 2.4 Resolution It is used to set the sampling resolution of the instrument, also called the sampling interval.

  • Page 25: Refractive Index

    It should be pointed out that the singular point measured in the case of high sampling resolution can be presented in the partial display, but may not be presented in the global display due to the screen resolution. The singular point can be presented in the display of 6419 BOTDR. 2.5 Refractive index It is used to set the refractive index of the fiber under test.

  • Page 26: Output Optical Power

    Chapter III Description of Test Conditions Figure 3-7 Setting interface of starting point 2.7 Output optical power The input box of output optical power is shown in Figure 3-8. There are four optional values of relatively low, low, medium and high. It’s used to set the intensity of the optical pulse signal used in the instrument test, and the increase of the output optical power can improve the quality of the test signal and the accuracy of the instrument when the optical fiber under test is long or the test signal is poor.

  • Page 27: Ending Frequency

    Chapter III Description of Test Conditions Table 3-4 Correspondence relation between the recommended value of the Start frequency and the pulse width Pulse width (ns) Recommended value of the Start frequency (GHz) fB(0)-0.2-fy/20000 B(0)-0.1-fy/20000 B(0)-0.05-fy/20000 B(0)-0.05-fy/20000 B(0)-0.05-fy/20000 Figure 3-9 Setting of the Start frequency 2.9 Ending frequency The ending frequency refers to the ending frequency of the scan.

  • Page 28: Frequency Interval

    Chapter III Description of Test Conditions Figure 3-10 Setting of the ending frequency 2.10 Frequency interval The frequency interval is the step value of the scanning frequency change, as shown in Figure 3-11. Users can choose 1MHz, 2MHz, 5MHz, 10MHz, 20MHz and 50MHz frequency interval through the touch screen or double- click of the mouse, or the “↑”...
  • Page 29 Chapter III Description of Test Conditions then the average center frequency value displayed in the Ave item is the initial frequency shift of Brillouin spectrum fB (0) of this segment of fiber, as shown in Figure 3-12. fB(0) Figure 3-12 Initial frequency shift of Brillouin spectrum fB (0) test By setting marker 1 and marker 2, the maximum value, minimum value, average value Note! and standard deviation of the fiber strain (or frequency) between the two markers can be...

  • Page 30: Continuous Test

    Chapter III Description of Test Conditions Figure 3-14 CS. setting interface 2.13 Continuous test The continuous setting parameter is used to set the timing test of the instrument and opening and closure of automatic saving function. The continuous test is in the "off" state by default in the system as shown in Figure 3-15. Continuous test can be enabled by selecting “enable”...

  • Page 31: Autosave

    "*.sta" and "*.eis" to choose from, and the "*.sta" type data stores all measurement results of the instrument, "*.eis" type data only contains data of strain. For the description about the type of the 6419 distributed optical fiber strain tester, see Chapter VI, Section 4.

  • Page 32: Description On Operation Of Test Condition Interface

    3 Description on operation of test condition interface The parameter boxes in the 6419 BOTDR test condition interface are divided into two categories. One is the input box that can be freely input by the user; the other is the drop-down box where the user can only select the parameter among the given parameters.
  • Page 33 Chapter III Description of Test Conditions ① Use the touch screen or left mouse button to click the part of the drop-down box that needs to change the parameters, and pop out the list; ② Select the desired parameter value to complete the input. (2) Use the buttons on the front panel to change the parameters in the drop-down box.

  • Page 34: Chapter Iv Description Of Window Display

    Chapter IV Description of Window Display 1. Description of the state of window display area There are seven states in the 6419 BOTDR window display area, which are “multiwindow” state, “strain distribution” state, “spectral width distribution” state, “Brillouin spectrum” state, “loss distribution” state, “comprehensive loss”...
  • Page 35 Chapter IV Description of Window Display of the test so that each window can display the full view of the curve. [Back]: Return to the main function menu, and the status of the window display area remains in the "multiwindow" state. Figure 4-2 "Multiwindow"...

  • Page 36: Strain Distribution Window

    Chapter IV Description of Window Display clockwise to the right and counterclockwise to the left. Click the "fast" button on the front panel, the movement speed of mobile knob will be ten times faster, click the "fast" button again to return to the original speed. Moving the position of the cursor in the “strain distribution”...
  • Page 37 Chapter IV Description of Window Display The vertical line in the window of Figure 4-3 is the cursor, the “0.37423km” below the horizontal axis is the distance value of the position where the cursor is located, and “2,656.8με” is the strain value of the position where the cursor is located (με...
  • Page 38 Chapter IV Description of Window Display data calculation. ① Placement of Marker points In the "strain distribution" state, the Marker sub-menu can be entered by clicking the [Marker] function button under the strain distribution sub-menu through the mouse, touch screen or menu buttons of front panel. At this time, the test condition area displays the Marker information, as shown in Figure 4- 4.
  • Page 39 Chapter IV Description of Window Display All information below the "Marker1-2" position belongs to the "Marker1-2" group, and the meaning of the data information is as follows. Distance: It indicates the difference in distance between marker point 1 and marker point 2, the unit is km, mi. or kft.
  • Page 40 Chapter IV Description of Window Display data of corresponding distance point. The strain value of measured data at the cursor is 3,902.6με, and the strain value of the reference data is 3,842.0με; the lower part shows the difference curve between the test data and the reference data, and the horizontal coordinate shows the distance of the current cursor position, 4.28858km and the difference between the two strains is 60.6με.

  • Page 41: Spectral Width Distribution Window

    Chapter IV Description of Window Display Figure 4-7 (b) Using the menu function [Switch Wilow] to switch the marker points to the position corresponding to the difference curve. 1.3 Spectral width distribution window Figure 4-8 Display area of "spectral width distribution" state window 1.3.1 Overview Click [Multiwindow] →...
  • Page 42 Chapter IV Description of Window Display [Back]: Return to the multiwindow sub-menu, the function menu area will display the multiwindow sub-menu. 1.3.3 Description of operation (1) Cursor movement and coordinate scaling ① In "spectral width distribution" state, the curve displayed in the window can be zoomed out by clicking the button in the waveform operation area through the left mouse button or the touch screen;...

  • Page 43: Brillouin Spectrum Display Dialog Box

    Chapter IV Description of Window Display the unit is GHz. Max: It indicates the maximum spectral width of the fiber segment between marker point 1 and marker point 2, the unit is GHz. Min: It indicates the minimum spectral width of the fiber segment between marker point 1 and marker point 2, the unit is GHz.
  • Page 44 Chapter IV Description of Window Display Figure 4-11 Window display area of “Brillouin spectrum" state 1.4.1 Overview Click [Multiwindow] → [Brillouin spectrum] to enter the display interface of Brillouin spectrum. The upper right corner of the window display area displays the state as “Brillouin spectrum”, and the function menu area displays the sub-menu of Brillouin spectrum, and the window display area is as shown in Figure 4-11, the sub-menu in “Brillouin spectrum”...
  • Page 45 Chapter IV Description of Window Display movement speed of mobile knob will be ten times faster, click the [Quick] button again to return to the original speed. The “Brillouin spectrum” window displays the Brillouin spectrum curve corresponding to Note! the selected distance point. Therefore, the selected distance point is changed directly by clicking the corresponding position on the global curve of strain with the left mouse button or the touch screen in the sub-window.

  • Page 46: Loss Distribution Window

    Chapter IV Description of Window Display Frequency difference: It indicates the frequency difference between marker point 1 and marker point 2, the unit is GHz. Loss: It indicates the difference of relative power between marker point 1 and marker point 2, the unit is dB. Max: It indicates the maximum relative power between marker point 1 and marker point 2, the unit is dB.
  • Page 47 Chapter IV Description of Window Display [Real-time Test]: Same as the [Real-time Test] function button in the main function menu, the instrument will perform real-time loss test on the selected sweep frequency. [Marker]: The function menu area will display the sub-menu of Marker for setting the marker points in the “loss distribution”...

  • Page 48: Comprehensive Loss Window

    Chapter IV Description of Window Display on the “loss distribution” state will have no response. (3) Operation of Marker points ① Setting of maker points of Marker In the “loss distribution" state, the Marker sub-menu and Marker information interface can be entered by clicking the [Marker] function button under the loss distribution sub-menu through the left mouse button, touch screen or menu buttons of front panel, which is shown in Figure 4-14.
  • Page 49 Chapter IV Description of Window Display Click [Multiwindow] → [Comprehensive Loss], or click the (Loss) button on the front panel to enter the comprehensive loss interface. The upper right corner of the window display area displays the state as “comprehensive loss”, and the window display area is as shown in Figure 4-15. Figure 4-15 Window display area of “comprehensive loss"...
  • Page 50 Chapter IV Description of Window Display at a time, the button moves the cursor to the right by units at a time. indicate normal movement, and button moves the cursor to the left by one unit at a time, the button moves the cursor to the right by one unit at a time.

  • Page 51: Description Of Sub-Waveform Window

    Chapter IV Description of Window Display curve calculated by the average loss. The rest can be done in the same manner. ③ Clearance of Marker points In the “comprehensive loss” state, use the left mouse button, touch screen or menu button of front panel to click the [Clear marker] function button under the sub-menu of comprehensive loss to hide all the maker points displayed in the "comprehensive loss"...
  • Page 52 Chapter IV Description of Window Display (3) In the “Brillouin spectrum” state, the [Sub.Wave] function button is set to [Global Brillouin spectrum] or [Global Brillouin spectrum], and the sub-waveform window displays the global curve of the strain distribution. After changing the selected distance point in the sub-window, the Brillouin spectrum curve in the “Brillouin spectrum”...

  • Page 53: Chapter V Description Of 3D Display Functions

    Chapter V Description of 3D Display Functions Chapter V Description of 3D Display Functions 1 Overview of state Click the [3D display] button in the main function menu to use the 3D display function of the instrument. At this time, the window display area displays the “3D” state, and the function menu area displays the 3D display sub- menu.
  • Page 54 Chapter V Description of 3D Display Functions Figure 5-2 “3D” state and 3D display sub-menu ① The 3D curve displayed in the window can be scaled by clicking the button in the waveform operation area with the left mouse button or the touch screen. The curve will shrink along the horizontal direction by pressing the button, the curve will enlarge along the horizontal direction by pressing the button.

  • Page 55: Chapter Vi Description Of File Functions

    Click the [File] button in the main function menu to enter the file sub-menu, as shown in the function menu in Figure 6-1. The functions of the button are described below. [Open]: Enter the file opening interface and read the historical test data of 6419 from the index path to display it in the window display area.

  • Page 56: File Saving

    Chapter VI Description of File Functions Figure 6-2 File opening interface 2 File saving Click the [Save] function button in the file sub-menu, the function menu area displays the file saving sub-menu, including three buttons: [New Folder], [Enter], [Back]; the state of the upper right corner of the window is displayed as "save file", the content distribution in the window is same as the file opening window.

  • Page 57: Description Of File Type

    Figure 6-4 Interface of opening the reference 4 Description of file type The 6419 distributed optical fiber strain tester saves files in two file types, one in sta format and one in eis format. 4.1 sta file format The sta format is a customized detailed storage format of the 6419 distributed optical fiber strain tester. Under this storage format, the 6419 distributed optical fiber strain tester stores all Brillouin gain spectrum data obtained in one test for a long time, thus occupying a large capacity.
  • Page 58 Chapter VI Description of File Functions 19 represents 190ns 20 represents 200ns Short type: Sampling resolution 0 represents 0.05m 1 represents 0.10m 2 represents 0.20m 3 represents 0.50m 4 represents 1.00m 5 represents 2.00m 6 represents 4.00m Double type: Start frequency, in MHz. Double type: Ending frequency, in MHz.

  • Page 59: Chapter Vii Description Of System Menu

    2 Description of VFL functions The 6419 has a built-in visible red light fault location (VFL) function that can help determine where the fiber breaks and where the light energy leaks. The VFL control window is shown in Figure 7-2.

  • Page 60: Description Of System Self-Check Functions

    Chapter VII Description of System Menu Select the [VFL] function button in the system sub-menu, and the software will pop out the VFL control window. It includes four options: “OFF”, “CW”, “1Hz”, and “2Hz”. The working status of the VFL can be adjusted via the navigation key on the front panel.

  • Page 61: Help

    Chapter VII Description of System Menu "Second" in the time format and "Year", "Month" or "Day" in the date format. [Language]: Set the software language. Press or click this menu button to expand the language drop-down menu in the system setting interface. The front panel navigation keys can be used to select between Chinese and English. [Dis.Unit]: Set the distance unit of the instrument system.
  • Page 62 Chapter VII Description of System Menu Figure 7-5 Help interface...

  • Page 63: Chapter Viii Application Methods

    Figure 8-2 On-off key of the front panel 1.2 Fiber access Step 1: Gently unscrew the protective sleeve of the BOTDR interface on the front panel of the 6419 distributed optical fiber strain tester. The position of the BOTDR interface is shown in Figure 8-3.

  • Page 64: Setting Parameters

    Chapter VIII Application Methods Figure 8-4 Groove of BOTDR interface and protrusion of FC/APC fiber interface Note: The BOTDR interface is an FC/APC fiber connector. It does not support access of FC/UPC or other types of fiber connectors. If the fiber access connector is not an FC/APC connector, please use the optical fiber patch cord (see Appendix D for details).

  • Page 65: Test Operation

    Chapter VIII Application Methods Figure 8-7 Position of [System] button Step 2: Click the [Shutdown] button in the system sub-menu, as shown in Figure 8-8. Figure 8-8 Position of [Shutdown] button Step 3: After the display is turned off, turn the switch on the back panel of the instrument to the off state, then turn off the power and unplug the power cord.

  • Page 66: Fb (0)

    Chapter VIII Application Methods Start frequency For details, see Chapter III, Section 2 Ending frequency For details, see Chapter III, Section 2 Frequency interval 5MHz/10MHz fB(0) For details, see Chapter III, Section 2 Given by fiber / cable manufacturers Step 3: Click the button [Test] on the front panel or the menu button [Average] to start the strain test. The background color of the [Average] button in the main function menu changes to light blue.

  • Page 67: Brillouin Spectrum Test Of Fiber

    Chapter VIII Application Methods Figure 8-11 Comprehensive loss curve of fiber The curve in the “comprehensive loss” window is the curve of comprehensive relative power Note! tested by the instrument. The vertical line in the window of Figure 8-11 is the cursor. The “7.94286km”...

  • Page 68: Fiber Length Test

    Chapter VIII Application Methods Figure 8-13 Spectral width distribution curve The curve in the “spectral width distribution” window is the distribution curve of Brillouin Note! spectral width along the fiber tested by the instrument. The vertical line in the window of Figure 8-13 is the cursor.

  • Page 69: Continuous Test Of Fiber Strain

    Chapter VIII Application Methods Figure 8-15 Brillouin spectrum disappears after crossing a certain point Method 2: Connect the fiber to the fiber interface, and measure the spectral width distribution curve of the fiber as shown in Figure 8-16 according to the range, pulse, resolution, and refractive index set in Section 2.5. Figure 8-16 Spectral width distribution curve of fiber under test It is seen that the spectral width value falls at a certain point, the point can be considered as the end of the fiber, and the length of the fiber can be obtained from the reading on the lower left corner is 24.63915km.

  • Page 70: Visible Red Light Fault Location (Vfl) Function

    3 Visible red light fault location (VFL) function The 6419 has a built-in visible red light fault location (VFL) function that can help determine where the fiber breaks and where the light energy leaks. Step 1: Connect the fiber under test to the VFL optical interface of front panel. VFL optical interface is shown in Figure 8-18, for detailed steps, see Chapter VIII, Section 1.2.

  • Page 71: File Management

    [OK] to save the file. 6419 BOTDR save files in two types, one is .sta format, which will store all the Brillouin Note! spectrum distribution data obtained by the test.

  • Page 72: Open The Reference Files

    Chapter VIII Application Methods Step 1: Click [File] → [Delete] on the main interface to enter the interface as shown in Figure 8-22. Figure 8-22 File deleting interface Step 2: Select the index disk in the file deleting interface of Figure 8-22, list the information tree under the index disk, select the file folder and file type, all the files in the folder will be listed, select the files to be deleted from the list, and click [OK] to delete the file.

  • Page 73: Waveform Comparison Function

    Chapter VIII Application Methods Note: The range of the reference file data should be consistent with the range of the original file data, otherwise, it will not be used as a reference! 4.5 Transfer the data files Step 1: Click [File] → [Transfer] on the main interface to enter the interface as shown in Figure 8-25. Figure 8-25 File transfer interface Step 2: In the file transfer interface of Figure 8-25, select the source index disk, select the folder and file type, and select the file to be transferred.

  • Page 74: Remote Control Function

    Chapter VIII Application Methods Figure 8-27 Reference interface of strain distribution Step 3: Same as step 2, click [Multiwindow] → [Spectral Width Distribution], [Brillouin spectrum], [Loss Distribution] and [Comprehensive Loss] in the main interface respectively to enter the corresponding curve interface.

  • Page 75: Chapter Ix General Faults And Processing Methods

    Chapter IX General Faults and Processing Methods Chapter IX General Faults and Processing Methods 1 Quick check of general fault Table 9-1 shows the possible faults and solutions for the instrument: Table 9-1 Faults and solutions Fault Possible reasons Solutions The switch of back panel is in the Turn the switch on the back panel to the “ON”...

  • Page 76: Setting Of Refractive Index

    Chapter IX General Faults and Processing Methods Chapter VI, Section 6 for details). too dark. The touch screen Click [System] → [Touch Screen Calibration] to calibrate cannot be clicked to The touch screen is not calibrated. the touch screen. For details, see Chapter XI, Section 7. the correct position.
  • Page 77 Chapter IX General Faults and Processing Methods Figure 9-3 Brillouin spectrum 2. When the initial and ending frequencies are deviated to the left, the Brillouin spectrum shown in Figure 9-4 will appear. Figure 9-4 Starting and ending frequency deviated to the left Solution: Move the starting and ending frequencies to the right, or use the current ending frequency as the approximate value of the initial frequency shift of Brillouin spectrum, and set the starting and ending frequencies to fB (0)-fy, fB (0)+fy.
  • Page 78 Chapter IX General Faults and Processing Methods Figure 9-5 Frequency spectrum of starting and ending frequency deviated to the right Solution: Move the starting and ending frequencies to the left, or use the current Start frequency as the approximate value of the initial frequency shift of Brillouin spectrum, and set the starting and ending frequencies to fB (0)-fy, fB (0)+fy.

  • Page 79: Adjustment Of Optical Power

    80000, the starting point setting value will take effect, and the starting distance of the test data of 6419 will be the setting value of starting point). Table 9-4 is a table of the relationship between resolution and range when the starting point takes effect.

  • Page 80: Brightness Adjustment

    Chapter IX General Faults and Processing Methods Table 9-5 Relationship among common pulse width, resolution and length measurement Pulse width (ns) Spatial resolution (m) Length measurement (km) 6 Brightness adjustment Click [System] → [System Set] to enter the system setting interface shown in Figure 9-9, click the LCD brightness through the touch screen, move the screen to the left to make it darken, and move the screen to the right to make it brighten, or the brightness can be controlled by the arrow direction on the front panel, move the left or upper arrow to make the screen darken, and move the right or lower arrow to make the screen brighten.

  • Page 81: Chapter X Working Principles

    Chapter X Working Principles Chapter X Working Principles 1 Fiber optic sensing technology Compared with traditional sensing technology, optical fiber sensing technology has shown great advantages. Compared with traditional electrical and mechanical sensor technologies, optical fiber sensing technology has unparalleled advantages in many applications due to its own characteristics. It’s featured by resistance to electromagnetic interference, corrosion resistance, small size, variable shape, high sensitivity and many sensing objects.

  • Page 82: Botdr Technology

    Chapter X Working Principles Δ v 0.5g 11.10 11.15 11.20 11.25 11.30 Brillouin gain (GHz) Figure 10-1 Brillouin scattering gain spectrum 4 BOTDR technology BOTDR is a distributed optical fiber sensing technology that uses spontaneous Brillouin scattering, its basic principle is to sensor the temperature/strain using the spontaneous backward Brillouin scattering effect of the fiber, and combines OTDR technology to achieve the positioning of the sensing parameters.
  • Page 83 Chapter X Working Principles the initial frequency shift of Brillouin spectrum, Cs is the strain coefficient of the fiber frequency shift of Brillouin spectrum, and is a constant related to the fiber material and the wavelength of the probe light. For a conventional G.652 single mode fiber, the strain coefficient Cs is typically approximate to 493MHz/%, or 0.0493MHz/με...

  • Page 84: Chapter Xi Technical Parameters

    Chapter XI Technical Parameters Chapter XI Technical Parameters 1 General characteristics The general characteristics of the 6419 distributed optical fiber strain tester are shown in Table 11-1. Table 11-1 General characteristics of 6419 distributed optical fiber strain tester NAME CONTENT DISPLAY 10.4"...
  • Page 85 Chapter XI Technical Parameters Repeatability of strain test: better than ± 100με Strain test range: -15,000 ~ +15,000 (με) Setting range of refractive index: 1.00000~1.99999, minimum step size: 0.00001 Distance-measuring range: 0.5, 1, 2, ..., 128km optional, 1km step 10. Test pulse width: 10, 20, 30, ..., 200ns optional, 10ns step 11.

  • Page 86: Appendix A Instruction For Use Of The Analysis Software

    Appendix A Instruction for Use of the Analysis Software The 6419 analysis software is used to read data files tested and saved by the 6419 optical fiber strain analyzer on the PC, and perform the remote control function. It has a standard version of 6419 Analyser Standard and professional version of 6419 Analyser Professional.

  • Page 87: Software Running

    After the 6419 analysis software is installed, taking the standard version for example, you can choose Start > Programs > CETC > 6419 Analyzer Standard > 6419 Analyzer Standard to run the analysis software. Alternatively, you can search the software installation path for the 6419 Analyzer Standard application to run it, as shown in Figure A-5.

  • Page 88: Software Interface

    Appendix A Instruction for Use of the Analysis Software 2 Software Interface Figure A-5 Software interface As shown in Figure A-5, the software interface consists of the following: ① File command button: Reads, exports, and prints data files. ② Function area: Includes functions such as data file display and analysis, settings, and remote control. ③...

  • Page 89: Data Display

    Note! Brillouin spectrum can be displayed only when you select Detailed Reading. In the standard analysis software (6419 Analyser Standard), two files can be read by using Note! Brief Reading and Detailed Reading every time respectively. In the professional analysis software (6419 Analyser Professional), a maximum of 100 files can be read by using Brief Reading and a maximum of 20 files can be read by using Detailed Reading every time.

  • Page 90: Curve Information

    Appendix A Instruction for Use of the Analysis Software Select files from the list for which Maker marks will be made Position coordinates of the cursor Maker marker point Information mapping between Maker marker points and marker point pairs Figure A-10 Results of marker placement in Display Strain mode The marker point information bar of Marker consists of two columns: Marker1-2 group and Marker3-4 group.

  • Page 91: Curve Zooming

    Appendix A Instruction for Use of the Analysis Software Display dialog box is closed. Brillouin window The file showing the mapping of Cursor Figure A-13 Brillouin Spectrum Display dialog box In the Brillouin Spectrum Display dialog box, you can right-click and choose Copy Image from the displayed shortcut menu to copy the displayed Brillouin spectrum to the clipboard as required.

  • Page 92: Data Analysis

    As shown in Figure A-19, when the cursor hovers on Difference, this button is highlighted. Click Difference. A shortcut menu containing Single-curve Difference and Multi-curve Difference is displayed. Choose an option to enter the related dialog box. Figure A-19 Difference function The multi-curve difference function is available only in the professional software (6419 Note!
  • Page 93 Appendix A Instruction for Use of the Analysis Software Analyser Professional). As shown in Figure A-20, the left part of the Single-curve Difference dialog box lists files. The upper part lists the principal strain files while the lower part lists the reference strain files. The right part of the dialog box consists of three graphic display boxes.

  • Page 94: Data Export And Print

    Appendix A Instruction for Use of the Analysis Software Figure A-23 Data exported from single-curve difference analysis Note! (1) If you right-click a selected reference strain curve on the read list and choose Data Export from the displayed shortcut menu, all files in the principal strain curve list, and the strain information and difference strain information of the selected reference strain file are exported.

  • Page 95: Print

    Copy Spectrum Data is used to copy the Brillouin spectrum data of a selected file at the location of the cursor in the graphic display area to the clipboard. Figure A-27 Shortcut menu in the graphic display area Copy Spectrum Data is available only in the professional software (6419 Analyser Note! Professional).
  • Page 96 Appendix A Instruction for Use of the Analysis Software Figure A-28 Print submenu The Print submenu consists of Print Preview, Print Settings, and Quick Print. You are recommended to configure print settings first and preview the print by choosing Print Preview before printing. 6.2.1 Print Settings Choose Print >...

  • Page 97: Remote Control

    Appendix A Instruction for Use of the Analysis Software It allows printing data files in the curve list based on the current default print settings. 7 Remote Control The analysis software allows you to remotely control the instrument by choosing Remote Control > Connection Parameters/Remote Control/Disconnect, as shown in Figure A-31.

  • Page 98: Disconnect

    Appendix A Instruction for Use of the Analysis Software The Command Action area provides functions like parameter query, parameter setting, and sending remote control command, as shown in Figure A-34. Figure A-34 Command Action in the Remote Control dialog box The Query drop-down list contains all items of the optical sampling and frequency scanning parameters.
  • Page 99 Appendix A Instruction for Use of the Analysis Software Figure A-36 Quick access toolbar In the drop-down list as shown in Figure A-36, choose More Commands. A dialog box for customizing the quick access toolbar is displayed, as shown in Figure A-37. In this dialog box, you can add the selected quick access tools to the quick access toolbar and set the display position of the quick access toolbar and corresponding shortcut keys.

  • Page 100: Appendix B 6419 Remote Control Command Set

    Appendix B 6419 Remote Control Command Set Appendix B 6419 Remote Control Command Set Table B-1 6419 remote control command set Remote Control Command Description Value (String) Queries the equipment :SENSe:CONDition:Model? Equipment model returned, such as AV6419. model. Queries the serial Serial number returned, such as 201706001.
  • Page 101 Appendix B 6419 Remote Control Command Set strain. of MHz/με, such as 0.05000. A number greater than 0 and smaller than 1, such as 0.5 or 0.66, separated from the preceding Sets the coefficient of :SENSe:CONDition:CS<value> strain. SCPI command with a space. The unit is MHz/με.
  • Page 102 Appendix B 6419 Remote Control Command Set Format.” Structure description: struct Send int D_Range; int D_PulseWidth; int D_AVERage; int D_RESolution; double D_IOR; double D_STARtsamplept; int D_INTErvalfreq; double D_fB; double D_CS; double D_STARfreq; double D_ENDfreq; int D_LIGHtpower; Table B-2 Data name description...
  • Page 103 Appendix B 6419 Remote Control Command Set char RecvData[2048]; int RecvLength; strcpy(OrderBuf,":SENSe:CONDition:SendTst"); send(Socket,OrderBuf,strlen(OrderBuf),0);//Send the file read command RecvLength=recv(Socket,RecvData,2048,0);//Receive file size DWORD FileSize; int num,rem; FileSize=atoi(RecvData); num=FileSize/2044;//Calculate the total number of packets to be transferred rem=FileSize%2044; if(rem!=0) num++; CFile File; File.Open("6419.eis", CFile::modeCreate|CFile::modeWrite|CFile::modeRead);...

  • Page 104: Appendix C 6419 Ordering Information

    Appendix B 6419 Remote Control Command Set send(Socket,OrderBuf,strlen(OrderBuf),0); recv(Socket,TestState,strlen(TestState),0); State=atoi(TestState); if(State==-1) MessageBox("Test error!") ; return; MessageBox("No. State point tested currently!") ; MessageBox("Test complete!") ; FileRead();//Read test file Appendix C 6419 Ordering Information 6419-XX-X-XXX Option No. S：Standa rd a nalysi s so ftware P：Pro fessional ana lysis software...

  • Page 105: Appendix D Identification Of Fc/Apc From Fc/Upc And Jumper Connection

    Figure D-5 FC/APC to FC/UPC jumper In usage, the FC/APC connector of the fiber patch cord is connected to the BOTDR port of the 6419 distributed optical fiber strain tester while the FC/UPC connector joins the FC/UPC connector of the sensing optical fiber via...
  • Page 106 Appendix D Identification of FC/APC from FC/UPC and Jumper Connection 6419 Fiber Strain Distribution Tester Flange BOTDR FC/APC FC/UPC FC/UPC plate Sensing optical FC/APC-FC/UPC fiber Switching jumper Figure D-6 Jumper connection Usually, to prevent dust from polluting the flange interior, the two ends of the flange are protected with the protector when it is not in use, as shown in Figure D-7.
  • Page 107 3 Usage of FC/APC-FC/UPC Extension Patch Cord In the optical fiber test, if the FC/APC connector fails to be connected to the 6419 optical fiber connector due to insufficient length, the FC/APC-FC/APC extension patch cord is required. The FC/APC-FC/APC extension patch cord is as shown in Figure D-13, with the FC/APC connector at both ends.

  • Page 108: Appendix E Maintenance And Cleaning Of The Optical Output Port

    FC/APC-FC/APC fiber Extended jumper Figure E-1 Protecting 6419 optical port with the fiber extension cord 2 Cleaning of the Optical Output Port (1) Roles of cleaning the fiber connector and optical output port As the fiber core is very small, the dust and particulate matters attached to the fiber connector and optical output port may cover some part of the fiber core at the output port, deteriorating the instrument performance.
  • Page 109 Appendix E Maintenance and Cleaning of the Optical Output Port End face of the optical output port Flange plate Figure E-2 Pulling out the flange Clean the end face of the optical output port and flange connector with the absorbent ball dipped in anhydrous alcohol.

  • Page 110: Appendix F Maintenance, Check, And Cleaning Of The Fiber End Face

    In case of non-distinct Brillouin spectrum and non-obvious loss curve, the fiber end face may be polluted and then you need to check it. Figure F-4 shows the fiber end-face inspector required to check the fiber end face. It is an option of the 6419 distributed optical fiber strain tester, with the No. of 001.
  • Page 111 Appendix F Maintenance, Check, and Cleaning of the Fiber End Face Viewer Port of the fiber connector Figure F-4 Fiber end-face inspector Step 1 Connect the fiber connector to the port on the bottom of the inspector, as shown in Figure F-5. This port supports the FC-APC and FC-UPC connectors.

  • Page 112: Cleaning Of The Fiber End Face

    Appendix F Maintenance, Check, and Cleaning of the Fiber End Face Fibre core Cladding Ceramic core Figure F-9 Image of a clear fiber connector As shown in Figure F-9, the optical fiber consists of the core, cladding layer, and ceramic core from the inside out. The fiber core ensures total internal reflection of light and transmits energy.
  • Page 113 Appendix F Maintenance, Check, and Cleaning of the Fiber End Face Figure F-12 Wipe the fiber connector with alcohol swab Step 2 Rub the fiber connector at the lens paper horizontally. Do not repeat rubbing the fiber connector at the lens paper used, avoiding secondary contamination to the fiber connector, as shown in Figure F-13.

  • Page 114: Appendix G Check And Handling Of Optical Fiber Break

    Appendix G Check and Handling of Optical Fiber Break Appendix G Check and Handling of Optical Fiber Break 1 Check of Optical Fiber Break 1.1 Check of Optical Fiber Break with BOTDR We can check whether the optical fiber breaks by measuring the fiber length. 1.1.1 Method 1 Step 1 Connect the fiber to the fiber port and set the appropriate range, pulse width, resolution, and refractive index.
  • Page 115 Appendix G Check and Handling of Optical Fiber Break Figure G-3 Brillouin spectrum disappears after crossing a certain point 1.1.2 Method 2 Step 1 Connect the fiber to the fiber port and set the appropriate range, pulse width, resolution, and refractive index.

  • Page 116: Check Of Optical Fiber Break And High-Loss Point Via Vfl

    1.2 Check of Optical Fiber Break and High-loss Point via VFL Figure G-6 VFL interface with protector The 6419 has a built-in visible red light fault location (VFL) function that can help determine where the fiber breaks and where the light energy leaks.

  • Page 117: Handling Of Optical Fiber Break

    Appendix G Check and Handling of Optical Fiber Break function. Step 6 Remove the fiber under test from the VFL optical interface and cover the VFL optical interface protection cover. 2 Handling of Optical Fiber Break The broken fiber needs to be spliced with the optical fiber fusion splicer. You are recommended to use the 6471A multi-functional optical fiber fusion splicer manufactured by China Electronics Technology Instruments Co., Ltd (CETI).

  • Page 118: Appendix H Recommended Tools For Cable Laying, Maintenance And Testing

    Appendix H Recommended Tools for Cable Laying, Maintenance and Testing Appendix H Recommended Tools for Cable Laying, Maintenance and Testing 1 6416/6418 Optical Time Domain Reflectometer Figure H-1 6416/6418 high-performance multi-functional optical time domain reflectometer The 6416/6418 optical time domain reflectometer is mainly used to measure the physical characteristics of optical fiber &...
  • Page 119 Appendix H Recommended Tools for Cable Laying, Maintenance and Testing 650nm ± 10nm, 2mW (typical), CW/1Hz Optical power meter None Wavelength range: 1,200nm to 1,650nm Power range: -60dBm to 0dBm Test uncertainty: ± 5% (-25dBm, CW) Optical output port FC/UPC (can be changed to ST/UPC or SC/UPC) External interface USB or Min-USB USB, Min-USB, Ethernet, headset, and SD...
  • Page 120 Appendix H Recommended Tools for Cable Laying, Maintenance and Testing 18. Long lifetime of electrode, discharging up to 4,000 times. 19. USB and VGA port. 20. Built-in high capability lithium battery, supporting 220 splicings and heatings. 21. Real-time accurate display of remaining battery capability. 22.

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