Komshine OTDR QX50 User manual

Optical Time Domain Reflectometer
KomShine
QX50 OTDR
User Manual

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Fast Operation Instruction for Using Buttons
[ ] Home page button:
● Escape from the current page and back to the home page directly.
● The button used together with button [ ] can realize in the OTDR home page "event,
parameters, fiber link, AB cursor” of the information window cycle switch display function.
[R/S] Measure/Stop Button:
● In the home page interface, use the buttons directly into the OTDR interface to start the
test，to achieve a key test operation.
● On the home page of OTDR function module, press this button to start measuring; during
measuring process, press this button to stop measuring.
● On the home page of OTDR function module, When used together with [Shift], can be
realized between the average and real-time measurement mode toggle selection.
[Enter] Confirmation button:
● On the main interface, it can realize the function of icon selection confirmation; when
conducting menu operation, pressing the button indicates that the current operation
comes into effect.
● On the keyboard or drop-down list，confirm corresponding character and data.
● In the menu dialog box, identify the current operation effect.
[ ] [ ]Up/down buttons:
● Select the desired menu icon.
● On the keyboard or drop-down list，select the corresponding characters or data.
● In the folder tree structure window, realize the tree node is moved up or down.
● When used together with [Shift], it can realize longitudinal amplifying and reducing of
contract displaying trace.
[ ] [ ] Left/right buttons:
● realize A/B rod left move or move to the right in the trace display window.
● Choose the selected character in the keyboard.
● In the Settings menu, realize the choice of different page when focus in column page (i.e.
Parameter Setting /File Setting/System Setting).
● In the folder tree structure window, expand or fold the sub-tree.
● When used together with [Shift], it can realize transversal amplifying and reducing of
contract displaying trace.
[Esc] Escape button:
● Back to upper operation page.
[A-B] A/B scale plates switching button, main function of the button:
● On the home page of OTDR function module, it can realize mutual switching of scale
plates A and B in the trace graph area.
● When used together with [Shift], it can realize scale plate A (or B) in the trace graph
switching to the next event position.
[Shift] Shift function button:
● On
the home page of OTDR function module, it can realize all trace displaying in the

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trace graph area.
● In the menu dialog box, it serves as a Tab switching key role, that is, the function switch
under each menu in the dialog box.
● On the home page of OTDR function module, the button used together with button [ ]
can realize in the OTDR home page "event, parameters, fiber link, AB cursor” of the
information window cycle switch display function.
● On the home page of OTDR function module, the button used together with buttons [▲]
[▼] can realize combination functions of longitudinal amplifying and reducing of trace.
● On the home page of OTDR function module, the button used together with buttons [ ]
[ ] can realize combination functions of transversal amplifying and reducing of trace.
● On the home page of OTDR function module, the button used together with button [ ]
can realize the fast switching options between the average and real-time measurement
mode.
● On the home page of OTDR function module, the button used together with button [A-B]
can realize scale plate A (or B) in the trace graph switching to the next event position.
● When using the shift key combination function, please press the [Shift] button, then press
the combination of keys, function realization, first release the key combination, then
release the [Shift] key.
[ ] Button for power supply:
● Turn on and turn off the power of instrument. Need to press and hold for 2-3 seconds
until the power light reaction can let go.

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Contents
1 Copyright Information.....................................................................................................................................................5
2 Safety Information...........................................................................................................................................................6
3 Appearance Diagram of OTDR Product......................................................................................................................8
3.1 Introduction to Electrical Interface of Instrument.............................................................................................9
3.2 Instruction of Optical Interface of Instrument...................................................................................................9
3.3 Instruction of Buttons on the Instrument.........................................................................................................10
4 Introduction to Home Page of OTDR.........................................................................................................................12
5 Introduction to Operation of VFL.................................................................................................................................13
6 Introduction to OTDR....................................................................................................................................................14
6.1 Measuring Purpose of OTDR...........................................................................................................................14
6.1.1 Measuring Contents of OTDR ..............................................................................................................14
6.1.2 OTDR Curve Analysis............................................................................................................................14
6.2 Basic Principle of OTDR...................................................................................................................................14
6.3 Instruction of Events Categories......................................................................................................................15
6.3.1 Initial Event..............................................................................................................................................15
6.3.2 End Event................................................................................................................................................15
6.3.3 Reflection Event......................................................................................................................................15
6.3.4 Non-reflection Event..............................................................................................................................16
6.3.5 Event Inspection.....................................................................................................................................16
7 Introduction to Operation of OTDR.............................................................................................................................17
7.1 Instruction of Home Page Screen of OTDR...................................................................................................17
7.1.1 Instruction of Trace graph Area on the Main Interface of OTDR.....................................................18
7.1.2 Instruction of Trace Operation Button Area on the Main Interface of OTDR.................................18
7.1.3 Instruction of Info Window Area of the Main Interface of OTDR......................................................19
7.1.4 Instruction of Status Bar Area on the Main Interface of OTDR........................................................21
7.2 Instruction of Menu Button “Set” of OTDR....................................................................................................22
7.2.1 Parameter Setting...................................................................................................................................22
7.2.2 File Setting...............................................................................................................................................24
7.2.3 System Setting........................................................................................................................................25
7.3 Instruction of Menu Button“Measurement”/“Stop”of OTDR.......................................................................26
7.4 Instruction of Menu Button“Saving”of OTDR................................................................................................27
7.5 Instruction of Menu Button“Open”of OTDR...................................................................................................29
7.6 Instruction of Menu Button“File Management”of OTDR..............................................................................30
7.7 Instruction of Menu Button“Multi- traces Analysis”of OTDR......................................................................31
7.7.1 Instruction of Button“Multi-traces Setting”.........................................................................................31
7.7.2 Instruction of Button“Trace 1/2/3/4” ....................................................................................................32
7.7.3 Instruction of Button“Remove”.............................................................................................................32
7.7.4 Instruction of Button“Esc”.....................................................................................................................32
7.7.5 Instruction of Button“Help”....................................................................................................................32
7.7.6 Instruction of Button“Home Page”.......................................................................................................32
7.8 Instruction of Menu Button “Trace Locking” of OTDR.................................................................................33
7.9 Instruction of Menu Button“Help”of OTDR....................................................................................................34
7.10 Instruction of Menu Button“Home Page”of OTDR.....................................................................................34
8 Instruction of PC Terminal Software of OTDR..........................................................................................................35
8.1 Installation of PC Terminal Software of OTDR..............................................................................................35

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8.1.1 Requirements to the Installation Environment....................................................................................35
8.1.2 Software Installation Steps....................................................................................................................35
8.1.3 Screen Resolution Ration Setting........................................................................................................35
8.2 Instruction of Interface of PC Terminal Software of OTDR..........................................................................36
8.3 Instruction of Menu Bar Window of PC Terminal Software of OTDR.........................................................37
8.3.1 Instruction of Menu“File”.......................................................................................................................37
8.3.2 Instruction of Menu “Editing”................................................................................................................44
8.3.3 Instruction of Menu“View”.....................................................................................................................45
8.3.4 Instruction of Menu“Help”.....................................................................................................................46
8.4 Instruction of PC Terminal Software Toolbar Window of OTDR.................................................................46
8.5 Instruction of PC Terminal Software Traces Window of OTDR..................................................................47
8.5.1 Displaying Area of“Trace graph”..........................................................................................................47
8.5.2 Displaying Area of“List of Multi-traces Displaying File”...................................................................48
8.5.3 Displaying Area of“Measurement Parameter”...................................................................................48
8.5.4 Displaying Area of“Measurement Result” ..........................................................................................48
8.6 Instruction of Event List Window of PC Terminal Software of OTDR ........................................................49
8.7 Instruction of the Whole Waveform Window of PC Terminal Software of OTDR.....................................49
8.8 Instruction of the Status Bar Window of PC Terminal Software of OTDR.................................................49
9 OTDR Products Maintenance and Service...............................................................................................................50
9.1 Operation Note of OTDR Product ...................................................................................................................50
9.2 Cleaning the Connector of Optical Interface..................................................................................................50
9.3 Maintenance and Changing of Battery...........................................................................................................51
9.4 Calibration of OTDR Products .........................................................................................................................51
9.5 Service and Guarantee.....................................................................................................................................52
9.5.1 General Information................................................................................................................................52
9.5.2 Responsibilities.......................................................................................................................................52
9.5.3 Disclaimer................................................................................................................................................52
9.5.4 Maintenance............................................................................................................................................53
9.6 Transportation ....................................................................................................................................................53
10 Common Failure Diagnosis of OTDR product........................................................................................................54
Appendix Technical Parameters of OTDR....................................................................................................................56

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1 Copyright Information
Copyright © 2013 belongs to us. Without agreement and written permission in advance of
us, any content in the manual couldn’t be copied, saved in retrieval system or spread by any
way, including electronic or mechanical photocopying, recording or any other method.
Guarantee
Any change of the information in the manual won’t be notified. We won’t guarantee
anything about the material, including, but not limited to hint guarantee for marketability and
adaptability of dedicated target. For these accidental or secondary losses caused by errors
contained, supplying to use the material, or the practicability of the edition materials, We won’t
undertake any responsibility.
Measurement unit
The measurement unit used by the manual complies with SI standard and conventions.

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2 Safety Information
Safety Instruction
When using the product, pay attention to the following safety measures. Any behavior not
adopting these safe operation methods or not complying with special cautions stated at other
places of the manual will violate the safe designing, manufacturing and using standard of the
products. We won’t undertake any responsibility for the consequences caused by customers
violating these requirements.
● Working Environment
Maximum relative humidity 95%, temperature 0℃ ～ +50℃.
● Before connecting to the power
Confirm that the product is set to the matched voltage, is installed with proper safety
components and is adopted with all safety measures.
● Product use
Please do not during charging boot using the product.
● Do not operate in explosive environment
Do not use the product when inflammable gas or smog existing.
● Do not dismantle the protection sheath of the instrument
Operators couldn’t dismantle the sheath of instrument or change interior components. If
need, please contact the maintenance personnel of our company.
Safety Terms of the Manual
Warning symbol indicates danger existed. It informs users pay attention to a
certain process, a certain operation method or similar conditions. If operate wrongly
or violate rules, bodily injury may occur. Do not enter into the next step before fully
understanding and meeting the indicated warning conditions.
Be careful symbol indicates danger existed. It informs users pay attention to a
certain process, a certain operation method or similar conditions. If operate wrongly
or violate rules, partial or fully damage or defacement may occur to the instrument.
Do not enter into the next step before fully understanding and meeting the indicated
careful conditions.
Indication symbol gives you helpful information about instrument operation and
maintenance.
Warning Matters
Optical time-domain reflectometer is laser equipment. Users should avoid
look steadily at the laser outlet from time to time, also couldn’t observe the optical
source outlet with microscope or magnifier, etc. If the energy of laser beam
focuses on the retina, the eyes will be hurt perpetually.
When using OTDR to measure optical fiber, working light in the measured
optical fiber couldn’t exist. Otherwise, the measuring result won’t be accurate,
and the instrument may be damaged perpetually.

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Cautions
Battery: the battery of our company’s optical time-domain reflectometer
adopts rechargeable lithium battery. When using the instrument after a long term
lying aside, charge the battery firstly. If the instrument is laid aside for more than 1
month, charge the battery in time to maintain the electricity in the battery. Do no
charge the battery over 8 hours. Do not take out the battery randomly. Do not
make the battery approach to fire and heat-flash. Do not open or damage the
battery. Do not touch the electrolyte of the battery, otherwise the eye, skin and
clothes will be injured and corroded.
Outside power supply: All OTDR series can use outside power supply. Requirements of
power supply: DC12V/3A, polarity: .
Avoid laser radiation: during measuring processing of optical fiber system, avoid looking at
the open optical fiber, optical fiber interface, optical fiber tie point and other optical source, etc;
otherwise, the eyes may come into contact with the transferred laser and be hurt.
zWhen the optical time-domain reflectometer working, do not look at the laser outlet
directly;
zAfter using, cover the dust cap onto the optical outlet of the optical time-domain
reflectometer;
zDo not directly look at the disconnected terminal of the being tested optical fiber. If
possible, make the disconnected terminal of fiber optical point to a non-reflective
object.

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3 Appearance Diagram of OTDR Product
Fig. 3-1 Appearance Diagram of OTDR

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3.1 Introduction to Electrical Interface of Instrument
● DC12V/3A Power supply interface
Requirement to power supply interface: input DC12V/3A, polarity: .
● USB、SD Data Interfaces
The instrument is matched with USB and SD card interfaces. SD card interface is matched
with a 4G SD card. The SD card is the default data saving medium of the instrument’s trace files.
To plug U disk (≤8G) into the USB interface can transfer the trace data saved in the instrument
into the U disk, and then save the data into the computer from the U disk to conduct subsequent
analysis; or take out the SD card from the instrument and plug into the computer to conduct
subsequent analysis. The data in the U disk can be read only if plug in the U disk when the
instrument is on.
● Charge Indicator
When charging the battery, the indicator is turned on to be green; when charging finished,
the indicator will turn off automatically.
● LAN Ethernet Interface
Several models have such interface.
● Audio Interface
Several models have such interface.
3.2 Instruction of Optical Interface of Instrument
● Optical Interface of OTDR
The optical interface is the measurement interface of OTDR. It adopts FC/UPC optical
connector (SC/ST are replaceable).
● VLS Optical Interface
The optical interface is the measurement interface of VFL. It adopts FC/UPC optical
connector (SC/ST are replaceable).
Invisible laser radiation
Do not look at the optical interface directly or look over the optical interface
through optical instrument.
The optical interfaces of OTDR and VFL output laser. Users should always
avoid look at the laser outlet directly. Not mention to observe the optical outlets
with microscope or magnifier. If the energy of laser beam focuses on the retina,
the eyes will be hurt perpetually.

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3.3 Instruction of Buttons on the Instrument
[] Home page button:
● Escape from the current page and back to the home page directly.
● The button used together with button [ ] can realize in the OTDR home page "event,
parameters, fiber link, AB cursor” of the information window cycle switch display function.
[R/S] Measure/Stop Button:
● In the home page interface, use the buttons directly into the OTDR interface to start the
test，to achieve a key test operation.
● On the home page of OTDR function module, press this button to start measuring; during
measuring process, press this button to stop measuring.
● On the home page of OTDR function module, When used together with [Shift], can be
realized between the average and real-time measurement mode toggle selection.
[Enter] Confirmation button:
● On the main interface, it can realize the function of icon selection confirmation; when
conducting menu operation, pressing the button indicates that the current operation
comes into effect.
● On the keyboard or drop-down list，confirm corresponding character and data.
● In the menu dialog box, identify the current operation effect.
[ ] [ ]Up/down buttons:
● Select the desired menu icon.
● On the keyboard or drop-down list，select the corresponding characters or data.
● In the folder tree structure window, realize the tree node is moved up or down.
● When used together with [Shift], it can realize longitudinal amplifying and reducing of
contract displaying trace.
[ ] [ ] Left/right buttons:
● realize A/B rod left move or move to the right in the trace display window.
● Choose the selected character in the keyboard.
● In the Settings menu, realize the choice of different page when focus in column page (i.e.
Parameter Setting /File Setting/System Setting).
● In the folder tree structure window, expand or fold the sub-tree.
● When used together with [Shift], it can realize transversal amplifying and reducing of
contract displaying trace.
[Esc] Escape button:
● Back to upper operation page.
[A-B] A/B scale plates switching button, main function of the button:
● On the home page of OTDR function module, it can realize mutual switching of scale
plates A and B in the trace graph area.
● When used together with [Shift], it can realize scale plate A (or B) in the trace graph
switching to the next event position.
[Shift] Shift function button:
● On the home page of OTDR function module, it can realize all trace displaying in the

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trace graph area.
● In the menu dialog box, it serves as a Tab switching key role, that is, the function switch
under each menu in the dialog box.
● On the home page of OTDR function module, the button used together with button [ ]
can realize in the OTDR home page "event, parameters, fiber link, AB cursor” of the
information window cycle switch display function.
● On the home page of OTDR function module, the button used together with buttons [▲]
[▼] can realize combination functions of longitudinal amplifying and reducing of trace.
● On the home page of OTDR function module, the button used together with buttons [ ]
[ ] can realize combination functions of transversal amplifying and reducing of trace.
● On the home page of OTDR function module, the button used together with button [ ]
can realize the fast switching options between the average and real-time measurement
mode.
● On the home page of OTDR function module, the button used together with button [A-B]
can realize scale plate A (or B) in the trace graph switching to the next event position.
● When using the shift key combination function, please press the [Shift] button, then press
the combination of keys, function realization, first release the key combination, then
release the [Shift] key.
[ ] Button for power supply:
● Turn on and turn off the power of instrument. Need to press and hold for 2-3 seconds
until the power light reaction can let go.

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4 Introduction to Home Page of OTDR
The home page (home) of OTDR provides two module functions - OTDR (optical
time-domain reflectometer) and VFL (visual fault location). Directly clicking OTDR or VFL can
enter into the operation page of their functional modules. As shown in the following figure.
4-1. Operation Interface Diagram of Home Page of OTDR
4-2. Operation Interface Diagram of Home Page of VFL

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5 Introduction to Operation of VFL
Click VFL functional module on the home page to enter VFL main operation interface
directly.
Fig. 5-1 Main Operation Interface Diagram of VFL
VFL provides two kinds of using status--“bright permanently”, “twinkling”. Clicking the
button “bright permanently”, the VFL will enter turn-on status of permanent lightening; clicking
the button “twinkling”, the VFL will enter turn-on status of 2Hz twinkling; clicking the button
“OFF”, the VFL will turn off immediately.
When clicking the button “auto turn-off”, the dialog box of auto turn-off setting is ejected.
Operator can conduct corresponding setting on the dialog box. Auto turn-off function provides
options of “OFF, after 5 min, after 10 min, after 30 min, after 1 hour, after 2 hours”. The default
setting is “10 min”, i.e., turns off after 10 min. No matter it is under which kind of auto turn-off
status, when clicking the button “OFF”, the “light permanently” or “twinkling” status of
VFL will be turned off.
Fig.5-2. Operation Interface Diagram of Auto Shutdown of VFL
On VFL interface, after turning on the VFL function, under turn-on status, users can enter
into OTDR interface through home page interface to conduct OTDR measurement; meanwhile, it
will provide a status window on the status bar to show the ON or OFF status.

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6 Introduction to OTDR
6.1 Measuring Purpose of OTDR
OTDR displays the power of the returned signal related to distance. The information can be
used to confirm the transmission quality of a fiber optic link.
6.1.1 Measuring Contents of OTDR
● Position (distance) of event, result or fractured position of fiber optic link;
● Attenuation coefficient of optical fiber in the optical fiber link;
● Loss of a single event (for example, a optical connector or bending), or total losses from
end to end on the fiber optic link;
● Reflection amplitude (or reflection level) of an event, such as connector
6.1.2 OTDR Curve Analysis
OTDR analyzes the curve automatically. Location of the curve:
● Reflection event generated from connection and mechanical connector;
● Non-reflection event (usually be fusion splice);
● Optical fiber bundling: through scanning the first loss event that larger than the bundling
threshold, OTDR detects the bundling of optical fiber;
● Events list: Category of events, loss, reflection, and distance are listed through
calculation.
6.2 Basic Principle of OTDR
Optical Time Domain Reflectometer is the full name of OTDR. OTDR is accurate
optoelectronic integrated instrument made according to back scattering that generated from
Rayleigh scattering and Fresnel reflection when lights are transmitted in the optical fiber. It is
widely used in the maintenance, construction and monitoring of cable line. It can measure the
optical fiber length, transmission attenuation of optical fiber, attenuation of splice, and failure
location, etc.
When the pulse being transmitted downwards along with the optical fiber, and some small
changes (such as changes of refractivity and discontinuity) in the material make the lights
scatter to different directions, Rayleigh scattering occurs. Partial lights are scattered back along
with the direction that opposite to pulse, therefore, it is called Rayleigh back scattering. Back
scattering light shows attenuation details that related to the length. Information related to length
is gained through time (i.e.: origin of domain of Optical Time Domain Reflectometer). These
back scattering signal indicates the attenuation (loss/distance) degree caused by optical fiber.
The curve formed is a downwards curve, which reflects the transmission characteristics of the
optical fiber.
When lights transmitted downwards along with the optical fiber encountering sudden
change of material density, Fresnel reflection occurs. Material density change may occur at the
connection or fracture parts where air gap existed. This phenomenon is used by OTDR to
accurately confirm the position of discontinuity point along with the length of optical fiber.
Compared to Rayleigh scattering, Fresnel reflection will reflect quite a lot of lights. The power of
Fresnel reflection is tens of thousands times of that of back scattering. The reflection strength is
ascertained according to the change degree of refractivity.

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Distance calculation formula of OTDR: Distance = (c/n) × (t/2)
Among which: c= speed of light in vacuum (2.998 x 108 m/s)
t = Time delay between transmitted pulse and received pulse
n = refractivity of optical fiber during testing process (nominated by manufacturer)
When displaying the whole trace, each point on the trace graph represents the average
value of several sampling points. The value of each sampling point can be found by reducing or
magnifying the trace.
Fig. 6-1. OTDR Principle Diagram
6.3 Instruction of Events Categories
Events on optical fiber indicate these abnormal points that brought loss or sudden change
of reflection power beyond normal scattering of optical fiber material, including various kinds of
connection and bending, loss of flaw or fracture on the optical fiber link.
Event points displayed on the screen is the abnormal points in the optical fiber that led to
deviation of trace, which are classified with special symbols on the trace.
Events include “reflection event” and “non-reflection event”.
6.3.1 Initial Event
“Initial event” on the OTDR trace is the event that marks the starting point of optical fiber.
Under default conditions, “initial event” is located at the first event (usually be the first
connector of OTDR) of the tested optical fiber. The event belongs to reflection event.
6.3.2 End Event
“End event” on the OTDR trace is the event that marks the terminal of optical fiber. Under
default conditions, “end event” is located at the last event of the tested optical fiber. The event
is called optical fiber terminal event (usually be the end or fracture point of the tested optical
fiber), which usually belongs to reflection event.
6.3.3 Reflection Event
When optical pulse energy is reflected (such as on the connector), reflection event occurs.
On the trace, reflection event is shown as peak signal, as shown in Fig.6-2.

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Fig.6-2 Reflection Event
6.3.4 Non-reflection Event
Non-reflection event brings loss on the whole transmission link of optical fiber, but no light
reflection. On the curve, non-reflection event is shown as drop of optical power, as shown in
Fig.6-3.
Fig.6-3 Non-reflection Event
6.3.5 Event Inspection
OTDR sends optical pulse into the optical fiber that waited for inspection, then, begins to
accept the returned optical signal immediately, and calculate the distance of “event” in the
optical fiber. The further the event is, the longer the time for returning back to OTDR will be. The
distance can be calculated according to the time when receiving the event.
Through inspecting the curve of the reflected signal, the optical transmission characteristics
of optical fiber, connector and joint can be confirmed.

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7 Introduction to Operation of OTDR
7.1 Instruction of Home Page Screen of OTDR
The trace displayed on the screen that measured by OTDR is shown in Fig.7-1.
Fig.7-1. Interface Diagram Displayed on the Screen of OTDR

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7.1.1 Instruction of Trace graph Area on the Main Interface of OTDR
The window displays the trace gained from the first measurement.
Definition of trace: After the first measurement, reflection power diagram is displayed as
distance function. The diagram is called trace.
Trace of OTDR displays the measurement result by graphic mode on the screen. The
vertical axis represents the power, while the lateral axis represents the distance. The event point
is marked with red symbol.
Fig.7-2 Schematic Diagram of Trace Area
Fig.7-3 Schematic Diagram of Marks of Event Point
7.1.2 Instruction of Trace Operation Button Area on the Main Interface of OTDR
“Longitudinal amplifying” indicates longitudinally amplifying the measured trace with the
intersection of the chosen sign post and the trace as center.
“Longitudinal reducing” indicates longitudinally reducing the measured trace with the
intersection of the chosen sign post and the trace as center.
“Transversal amplifying” indicates transversally amplifying the measured trace with the
intersection of the chosen sign post and the trace as center.
“ Transversal reducing ” indicates transversally reducing the measured trace with the
intersection of the chosen sign post and the trace as center.
“Whole trace” indicates displaying the whole measured trace.
“Lock/Unlock of AB” indicates Lock/Unlock of relative position of scale plates A and B.
“Switching of trace” indicates mutual switching between or among two or more measured
traces.
“Move upwards” indicates upward movement of measured trace.

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“Move downwards” indicates downward movement of measured trace.
“Longitudinal reset” indicates longitudinal reset of measured trace.
● When measuring, except for the stop icon, functions of the other icons in
the icon tool bar for trace operation are forbidden.
7.1.3 Instruction of Info Window Area of the Main Interface of OTDR
Contents of info window include measurement parameter, event list, scale plate A/B, and
analyzed parameter, etc.
Measurement parameter includes laser wavelength, distance scope, pulse width,
refractivity, back scattering coefficient, reflection threshold, bundling threshold, non-reflection
threshold, and duration of measurement. The definition and setting are shown in “set” menu.
When looking over these parameters, click the icon “parameter” through the touch screen,
and then the parameter information can be found in the info window. Contents of parameters are
shown in Fig.7-4:
Fig.7-4 Info Window of Measured Parameter
Optical fiber link information includes file name, measurement date, measurement time, link
length, link loss, link attenuation coefficient, and quantity of event. Definition and setting of file
name, duration of measurement, and measurement date are shown in “set” menu. When
looking over information of optical fiber link, click the icon “fiber link” through the touch screen,
then the information of optical fiber link can be found in the info window. Contents of information
of optical fiber link are shown in Fig.7-5:
Fig.7-5 Info Window of Optical Fiber Link
Information of scale plate includes position of point A (or B), plug-in loss of point A (or B),
back scattering coefficient of point A (or B), accumulate loss of point A (or B), distance of A B
section, loss between two points of AB section, attenuation coefficient between two points of AB
section, and LSA attenuation coefficient of AB section. Sign post is used to mark and analyze a
single event, curve section and distance. The information of sign post shows distance, loss and
attenuation coefficient between sign posts. When changing any sign post, the record value will
also be changed along with it. When looking over information of scale plate, click the icon “AB
cursor” through the touch screen, then the information of scale plate can be found in the info