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OTDR Basic Operation

The Optical Time Domain Reflectometer (OTDR) is an instrument that uses the inherent backscattering
properties of an optical fiber to detect faults and categorize its condition. The OTDR sends high-power
pulses of laser light down the fiber and captures the light that is reflected back (much like a radar system).
By measuring the timing and power levels of the return pulses, the instrument correlates the reflected
information with physical locations along the fiber and displays a “trace” that shows optical power versus
distance. Attenuation of the fiber is displayed as the slope of the trace. Interruptions such as splices,
connectors, bends, breaks or flaws in the fiber appear as transitions (“events”) that represent their nature
and location.

Display

Processor

Detector

Laser

Coupler

Fiber

under test

Probe

pulse

End of

fiber

Rayleigh

backscatter

Fresnel

reflection

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Содержание GREENLINE 920XC Series

Страница 1: ...XC fiberTOOLS 920XC Handheld OTDR Training Presentation 920XC Training VER 1 0 ...

Страница 2: ...ring the timing and power levels of the return pulses the instrument correlates the reflected information with physical locations along the fiber and displays a trace that shows optical power versus distance Attenuation of the fiber is displayed as the slope of the trace Interruptions such as splices connectors bends breaks or flaws in the fiber appear as transitions events that represent their na...

Страница 3: ...mic range Bellcore defines the dynamic range as the displayed attenuation in dB from the backscatter level at the front panel to an imaginary line past the end of the fiber that lies just above 98 of the noise Another common definition based on Signal to noise ratio 1 uses an imaginary line that lies just above roughly 63 of the noise ...

Страница 4: ...re the OTDR can accurately measure the loss of a non reflective event Typically the attenuation dead zone is the distance from the leading edge of the reflection to the point past the reflection where the OTDR signal level returns to within 0 5 dB of the backscatter level ...

Страница 5: ... measure the distance to a second reflection sometimes called the two point spatial resolution The event dead zone is measured from the leading edge of the reflection to the point past the reflection where the level of the OTDR signal drops at least 1 5 dB from the top of the reflection ...

Страница 6: ...n Automated Measurement Analysis File Save 38dB Dynamic Range 1 5 meter event deadzone Large color LCD display Measure length and defects of coiled fiber RS 232 and USB interface Store 1000 measurement results NiMH battery for 8 hours continuous use Internal VFL 650nm ...

Страница 7: ...nt for example one optic tie in or total loss from upper end to end Range of a single event like reflection of connectors or grade of reflection Auto measurement of cumulative loss of a single event Trace Analysis The trace analysis of the 920XC OTDR is fully automatic The trace locates Reflection events of connections and mechanical tie ins Non reflection events End of optical fiber Through scann...

Страница 8: ... 13 8 VDC at 1 2 A 4 Data Transfer Ports USB and RS 232 interfaces to transfer saved traces in the instrument to a PC for further analysis with Trace Viewer software provided 5 Fiber Optic Output for OTDR and VLS visual fault locator The VLS Connector is used for the OTDR interface at 1625nm 6 Invisible Laser Caution Do not look directly at the optical output or stare at the laser beam ...

Страница 9: ...ting press to stop measurement 3 Enter Under GUI press to confirm the current operation Use with the Shift key to browse down the events list 4 up and down arrows Move menu bar in menu operation Highlight the icon to be selected Adjust parameter in parameter configuration Use with the Shift key to zoom out or zoom in trace vertically ...

Страница 10: ... the Shift key to zoom out or zoom in trace horizontally 6 Arrow Read Help menu when power on Cancel the current operation Exit menu configuration Switch between information windows Use with the Shift key to browse up the events list 7 Shift Under GUI press to return a trace to original size without any zoom Activate the integration function by pressing this key together with other keys ...

Страница 11: ...Main Display ...

Страница 12: ...Measurement Window Manual Measurement View Event Finder View Instrument Setup View Fiber Analysis View Measurement Window ...

Страница 13: ...vent fiber end attenuation event Location Distance from beginning point to event Refl Magnitude of reflection Ins L Loss of inserted event Attn Attenuation characteristic from one event point to the current event Cum L Cumulative loss calculating from beginning point to the current event ...

Страница 14: ... at a marker or between markers will be displayed in marker information The following parameters are measured between marker A and B Changing either marker will change the record accordingly A B Distance between two markers 2Pt Loss Loss between two markers power difference between two markers 2Pt Atten 2 points loss of unit length ...

Страница 15: ...ed in the information window For definitions and configurations of items average time sample distance range IOR wavelength and pulse width as well as definitions of item date reflection threshold non reflection threshold end threshold and scattering coefficient refer to Setup Configuration later in the presentation ...

Страница 16: ...Menu Bar and Icons ...

Страница 17: ...Setup Parameters ...

Страница 18: ...Enter to confirm Notes Auto means automatic measurement When this function is selected the instrument automatically selects an adequate range and pulse width for the measurement The process of measurement does not require any intervention by the user Auto is the default setting ...

Страница 19: ...ng higher dynamic range and measure comparatively longer distance but resolution and deadzone will be increased Therefore users should make the choice between dynamic range and deadzone The options for pulse width will change according to the distance range selected Under the parameter configuration menu use and to highlight PulseWidth Press Enter to select a value Press to exit Auto is the defaul...

Страница 20: ...tical fiber a long average time should be selected in order to review events at the long distance end Under the parameter configuration menu use and to highlight Avg Time Press Enter to confirm Figure 3 12 Press to exit Use and to highlight the desired time Press Enter to confirm There are five levels of predefined average time 15 s 30 s 1 min 2 min and 3 min The default setting is 30 s ...

Страница 21: ...Setup Wavelength Wavelength Selection Under the parameter configuration menu use and to highlight Wavelength Press Enter to change the wavelength Only on the 920XC ...

Страница 22: ... under real time mode press Run Stop to stop otherwise it will measure continuously Under Averaging mode the tool will average the data within the measure time which is set by the user When exceeding the set time it will stop automatically and display the result In general averaging is the preferred mode Under the parameter configuration menu use and to highlight Meas Mode Press Enter to select Av...

Страница 23: ...Setup VFL VFL Configuration Under the parameter configuration menu use and to highlight VFL Depending on demand press Enter to select CW 1Hz or Off Press to exit ...

Страница 24: ...Setup Length Units Length Units Under the parameter configuration menu use and to highlight Length Units Press Enter to select the desired units of measurement Press to exit ...

Страница 25: ...rement In general the IOR parameter is provided by the optical fiber manufacturer and it can be set to the accuracy of four digits after the decimal point between 1 0 and 2 0 Under the parameter configuration menu use and to highlight IOR Press Enter to enter a value Press to exit Use and to adjust the position of the highlighted area Use and to change the digits After setting press Enter to confi...

Страница 26: ...kscatter power This configuration affects the calculation of reflection value Under the parameter configuration menu use and to highlight Scat Coef Press Enter to enter a value Press to exit Use and to adjust the position of the highlighted area Use and to change the digits After setting press Enter to confirm ...

Страница 27: ...tion loss events Only events to this threshold will be listed Under the parameter configuration menu use and to highlight Nrefl Thre Press Enter to enter a value Press to exit Use and to adjust the position of the highlighted area Use and to change the digits After setting press Enter to confirm Note The default setting is 0 20 dB ...

Страница 28: ...ection events to this threshold will be displayed in the events list Under the parameter configuration menu use and to highlight Refl Thre Press Enter to enter a value Press to exit Use and to adjust the position of the highlighted area Use and to change the digits After setting press Enter to confirm Note The default setting is 52 00 dB ...

Страница 29: ...ed the end of the optical fiber If the value is set to 0 dB there will be no end threshold Under the parameter configuration menu use and to highlight End Thre Press Enter to enter a value Press to exit Use and to adjust the position of the highlighted area Use and to change the digits After setting press Enter to confirm Note The default setting is 03 00 dB Setup End Threshold ...

Страница 30: ...enu use and to highlight Delete File Press Enter to enter Press to exit Use and to choose the files to delete Press Enter to confirm One or several files can be deleted at a time Use and to select Delete Press Enter and choose Yes to delete or No to not delete Choosing Cancel will exit the Delete menu ...

Страница 31: ...ion is used to change system time Under the parameter configuration menu use and to highlight Time y m d Press Enter to change Press to exit Use and to adjust the position of the highlighted area Use and to change the digits After setting press Enter to confirm ...

Страница 32: ... battery power When auto off is enabled the instrument will automatically power off when idle for 5 minutes Under the parameter configuration menu use and to highlight Auto Off Press Enter to switch between Off and On Press to exit Note The default setting is On ...

Страница 33: ...Setup Language Language Configuration There are two language options English and Chinese Under the parameter configuration menu use and to highlight Lang Press Enter to switch the language Press to exit ...

Страница 34: ...Setup LCD Contrast Adjust Contrast Adjustment of LCD The contrast of the LCD can be adjusted Under the parameter configuration menu use and to highlight LCD Contrast Press Enter to adjust Press to exit ...

Страница 35: ...hanges the color scheme of the display Under the parameter configuration menu use and to highlight Color Mode Press Enter to choose a different mode Press to exit Use and to highlight the desired color mode setting Press Enter to confirm the selection ...

Страница 36: ...s These parameters include range pulse width average time IOR non reflection threshold reflection threshold end threshold and scatter coefficient Under the parameter configuration menu use and to highlight Load Default Press Enter to enter Press to exit Use and to highlight Yes or No Press Enter to confirm ...

Страница 37: ...up Help Help The Help function provides access to the quick reference screen Under the parameter configuration menu use and to highlight Help Press Enter to display the quick reference screen Press to exit ...

Страница 38: ...Performing a Measurement Initial Splash Screen Quick Reference Screen ...

Страница 39: ... Auto Trace Measurement Auto measurement can be used if the length of optical fiber is unknown The 920XC will select an adequate range for measurement For auto measurement follow these steps 1 Set the range to Auto 2 Press Run Stop to start the measurement 3 Interface 4 Total 00 30 Measure time which is set by user is 30 seconds 5 Passed 00 16 Total measurement time has passed 16 seconds 6 Blinkin...

Страница 40: ...ally To zoom out horizontally using the keypad press Shift 2 Use or to move the marker to the event point being reviewed 3 Refer to Switching between Marker A B above for more information Zoom in Trace Horizontally Under GUI use and to highlight and then press Enter to zoom in the trace horizontally To zoom in horizontally using the keypad press Shift Zoom a Trace Horizontally ...

Страница 41: ...zoom out the trace vertically To zoom out vertically using the keypad press Shift 2 Use or to move the marker to the event point being reviewed 3 Refer to Switching between Marker A B above for more information Zoom in Trace Vertically 1 Under GUI use and to highlight and then press Enter to zoom in the trace vertically 2 To zoom in vertically using the keypad press Shift ...

Страница 42: ...and then press Enter to switch between marker A B Use and to move marker A or B Information between Marker A B Under GUI press to switch the information window to marker A B information Use or to change the position of marker A or B and the marker A B information will change accordingly in the information window ...

Страница 43: ...te it can be re analyzed using this function to change the threshold This function can be effective while the OTDR is disconnected from the fiber Under the parameter configuration menu edit the threshold value and then press to exit the parameter configuration menu Press to re analyze the trace ...

Страница 44: ...alphanumeric characters one by one and then press Enter to confirm The filename can be a maximum of eight characters in length 3 Save file Use and to highlight OK and then press Enter to save 4 Cancel save file Use and to highlight Cancel and then press Enter to cancel the save file operation 5 Delete alphanumeric characters Use and to highlight Delete and then press Enter to delete the characters...

Страница 45: ...ht and then press Enter to confirm 2 Use and to highlight the trace and then use and to choose Open or Cancel Press Enter to confirm 3 Memory space 118 300 means that total memory space is 300 files 118 files have been saved so far Browse a Saved Trace ...

Страница 46: ... through RS 232 or USB interface cable 4 Power on the 920XC and upload data with the software Notes Make sure the instrument is powered off when connecting to a PC through RS 232 or USB data cable USB operation rules must be followed while connecting to a PC Proper installation of a USB driver is necessary before uploading the data This operation cannot be applied under the GUI for parameter confi...

Страница 47: ...Battery Information NiMH rechargeable batteries 8 hours continuous operation 20 hours standby operation User changeable batteries ...

Страница 48: ...to protect the batteries in case of excessive discharging The internal battery should be recharged immediately through the adapter Recharging Perform a quick charge first and then switch to trickle charge after the voltage reaches a predefined figure Quick charge temperature is 5 C to 45 C 41 F to 113 F and trickle charge temperature is 0 F to 55 C 32 F to 131 F Battery will not be fully charged o...

Страница 49: ... the indicator will turn off When the instrument is powered on and powered through the AC DC adapter the internal battery is automatically recharged The icons mean the following When the 920XC is powered by the internal rechargeable battery the power level of the battery is shown on the LCD Battery is being recharged Battery is fully charged No power Low power Half power More than half power Full ...

Страница 50: ... the OTDR has not been used for one month To replace the NiMH battery Figure 5 1 1 Remove the battery compartment cover 2 Remove the battery and disconnect the battery connector 3 Replace the battery with the Greenlee supplied replacement battery To replace the RTC battery Figure 5 1 1 Remove the NiMH battery as above 2 Remove the RTC coin cell battery 3 Replace using a CR1220 Insert the replaceme...

Страница 51: ...ent In addition power density may burn dust into optical fiber and induce further damage for example 0 dBm optic power may produce about 16000000 W m m power density in single mode fiber If this happens the measurement will be inaccurate and damage will be irreversible Tools for Cleaning Interfaces and Connectors Optical fiber cleaner for cleaning optical connectors Optical fiber cleaning rod for ...

Страница 52: ...Specifications ...

Страница 53: ...Trace Viewer Software ...

Страница 54: ...l line 4 Events list window Events Table 5 Measurement and analysis parameter window Parameter Sheet 6 Fiber information window fiber section information 7 Fiber chain information window fiber chain information 8 Status bar Trace Viewer Software GUI ...

Страница 55: ...tory text relating to the trace file that users type in For each measurement users can save the measurement trace with the 920XC This software provides an interface for text input For each trace file users can input related information Window W The Window menu Figure 7 5 controls the display of the sub windows trace window events table window parameter window and fiber chain information Tile funct...

Страница 56: ...y By moving the marker the horizontal distance and vertical power can be read manually Zooming in and out of the trace features depends on the activation of a marker The sloped line represents backscatter from the optical fiber The peaks are reflective events in the fiber chain The end of the fiber is shown by the sudden drop in optical power which is followed by noise The symbols at the bottom of...

Страница 57: ... Value of reflection event Insertion Loss Vertical decline of dB Attenuation Coefficient Value of attenuation per kilometer between current event point and previous event point in optical fiber chain Cumulative Loss dB value of loss from 0 km to current event point Dist Prev km Distance from the previous event Dist End km Distance from the end event Comment Notify other details of the event Event ...

Страница 58: ...ers of the currently displayed trace Measurement parameters include range pulse width average time and wavelength Analysis parameters include IOR scattering coefficient end threshold non reflection threshold reflection threshold and sampling distance Parameter Window ...

Страница 59: ...ker A and B attenuation coefficient and loss information The two point loss is the difference of vertical power between marker A and B Two point attenuation is the two point loss of marker A and B divided by the horizontal distance between marker A and B Marker Information ...

Страница 60: ...Total Fiber Info The contents displayed in this window are date of measurement length of fiber chain loss of fiber attenuation and event number of fiber Total Fiber Info ...

Страница 61: ...able Turn the 920XC on and run the 920XC Trace Viewer software Under the File menu select Upload trace file and the Communications Settings dialog box appears Choose a communication port USB or RS 232 and click OK Choose the saved position of traces and then start uploading data Upload Trace Data ...

Страница 62: ... fiber information Zoom out trace horizontally Zoom in trace horizontally Zoom out trace vertically Zoom in trace vertically Full screen Analyze insertion loss the five point measurement to test the insertion loss Analyze reflectance Lock marker A and B Display version ...

Страница 63: ...ware interface so that data can be exported in ASCII format and then opened and viewed by a third party application Select ASCII format output under the File menu Select the information and format and then press Enter to choose the path and file name ASCII Format ...

Страница 64: ...start editing optical fiber information Information of optical fiber is a description of measurement trace displayed in the trace window Users input relevant information for efficient management of measurement files Upon completion of editing press Enter to confirm Edit Optical Fiber Information ...

Страница 65: ...inadequate parameter configuration use the add event function to manually add this event into the events list Click the events list window and select Add event under the Editing menu Choose the type of event from the pull down menu enter the event features and then press Enter to add the event to the events list Add Event ...

Страница 66: ...equate parameter configuration Select the event to be revised in the events list window and select Revise event After modifying the event feature s press Enter to confirm the changes The software will automatically refresh the event sequence Events can also be revised by clicking on the event to access a pop up menu Modify Event ...

Страница 67: ...ts list when it appears in error due to inaccuracies caused by poor SNR or inadequate parameter configuration Highlight the event to be deleted and then select Delete event under the Editing menu Events can also be deleted by clicking on the event to access a pop up menu Delete Event ...

Страница 68: ...t Batch Edit The 920XC Trace Viewer software has a batch edit function that allows users to edit the trace information of several trace files in the same folder at one time Select Batch Edit under the File menu ...

Страница 69: ...rinting Options Select Printing options under the File menu to select the contents to be printed Printing Setup Select Printing setup under the File menu to select the printer paper size and printing orientation ...

Страница 70: ...Batch Print The 920XC Trace Viewer software has a batch print function that allows users to print several trace files in the same folder at one time Select Batch Print under the File menu Batch Print ...

Страница 71: ...XC fiberTOOLS 920XC Handheld OTDR CSR Training ...

Страница 72: ...vice provider FTTN fiber to the node in which a fiber is run from the central office to node that service the neighborhood of business FTTH Fiber to the Home were a fiber is run directly to the home Product Positioning Statement We are proud to announce the 920XC series of handheld OTDR s The 920XC product launch coincides with the rapid expansion of telecom service provider s fiber optic build ou...

Страница 73: ...g the timing and power levels of the return pulses the instrument correlates the reflected information with physical locations along the fiber and displays a trace that shows optical power versus distance Attenuation of the fiber is displayed as the slope of the trace Interruptions such as splices connectors bends breaks or flaws in the fiber appear as transitions events that represent their natur...

Страница 74: ...and the loss of any splices that may be on the fiber cable What is fault locating As fiber proliferates into the last mile of the service provider s fiber optic network fiber optic cable faults will increase Fault locating is using the OTDR to find a break in the fiber optic cable The 920XC easily accomplishes this task through the Auto setup mode The user simply has to press the START STOP key an...

Страница 75: ... Analysis File Save 38dB Dynamic Range 1 5 meter event deadzone Large color LCD display Measure length and defects of coiled fiber RS 232 and USB interface Store 1000 measurement results NiMH battery for 8 hours continuous use Internal VFL 650nm 920XC Feature Overview ...

Страница 76: ...920XC Handheld OTDR Protective Rubber Boot Sealed Membrane Panel Color LCD with Protective Cover OTDR port VFL port USB and RS 232 port ...

Страница 77: ...Specifications ...

Страница 78: ... configuration The 920XC has four base models to choose from Base Model Description 920XC 30F 1310 1550 1625nm OTDR 920XC 30P 1310 1490 1550nm 920XC 20C 1310 1550nm OTDR 920XC 20M 8501300nm Multimode OTDR Product Configurations ...

Страница 79: ...Optical Interfaces OTDR and VFL Interface PC or APC polish Ceramic alignment sleeve Removable adapter for easy cleaning Protective dust caps Connector adapters available FC ST SC ...

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