Pro OCC-CWDM-301-18B User manual

OCC-CWDM-301-18
SERIES
Optical Channel Checker
Operation Guide

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OCC-CWDM-301-18
Notices
No part of this manual may be reproduced in any form or by any means (including electronic storage and retrieval
or translation into another language) without prior agreement and written consent of the Provider, as governed by
international copyright laws.
Warranty
The material contained in this document is subject to change without notice. The Provider makes no warranty of
any kind with regard to this material, including, but not limited to, the implied warranties of merchantability and
fitness for a particular purpose. The Provider shall not be liable for errors contained herein or for incidental or
consequential damages in connection with furnishing, performance, or use of this material.
The battery is a consumable part and is not subject to the OTDR warranty.
ISO9001 Certification
Produced to ISO9001 International Quality System Standard as part of the Provider, objective of continually
increasing customer satisfaction through improved process control.
Safety Instructions
During each stage of operation of this instrument, please always observe the following safety instructions. Not
taking any safety precautions or following the instructions will violate the safety standards of design,
manufacturing and application of these instruments. In no case will the Provider bear the responsibilities for
consequences incurred by violation of the following instructions.
GENERAL
This product is a Safety Class 3 instrument. The protective features of this product may be impaired if it is used in
a manner not specified in the operation instrument.
Environmental conditions
It is designed to operate at a maximum relative humidity of 95% and at altitudes of up to 2000 meters. Refer to
the specifications tables.
Before applying power
Verify that the product is set to match the available line voltage, the correct fuse is installed, and all safety
precautions are taken. Note the instrument’s external markings described under Symbols.
Do not operate in an explosive atmosphere
Do not operate the instrument in the presence of flammable gases or fumes.
Do not remove the instrument cover
Operating personnel must not remove instrument covers. Component replacement and internal adjustments must
be made only by qualified service personnel.
Instrument that appears damaged or defective should be made inoperative and secured against unintended
operation until they can be repaired by qualified service personnel.

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OCC-CWDM-301-18
Safety Terms Used in This Manual
The WARNING sign denotes a hazard. It calls attention to a procedure, practice, or the like, which, if not
correctly performed or adhered to, could result in personnel injury. Do not proceed beyond a WARNING sign
until the indicated conditions are fully understood and met.
The CAUTION sign denotes a hazard. It calls attention to an operating procedure, or the like, which, if not
correctly performed or adhered to, could result in damage to or destruction of part or the entire product. Do not
proceed beyond a CAUTION sign until the indicated conditions are fully understood and met.
The NOTE sign information that may be beneficial during the use and maintenance of the instrument.
Warning
•OTDR is a laser instrument. Users should avoid looking directly into the optic output. And the use of
microscope or magnifier should also be avoided, for the use of such devices can focus a highly intense
beam onto the retina, which may result in permanent eye damage
•Make sure that the optical fiber or cable is not in use and there is no laser beam in the fiber before testing
via OTDR. Otherwise, it may result in imprecise test trace, even permanent damage for the OTDR
Caution
Battery: Battery for this instrument is rechargeable NiMH battery. If unused for a long time, battery should be
recharged before being used. If the instrument is left idle for more than two months, it should be recharged to
maintain adequate battery volume. Do not recharge batteries for more than 8 hours. Do not take batteries out
without technical staff’s help. Do not expose batteries to fire or intense heat. Do not open or mutilate batteries.
Avoid touching the electrolyte in the batteries, which is corrosive and may cause injuries to eyes, skin or damage
to clothes.
External Power: The OLT-CC-18-301 Series supports external power. Power requirements: DC 13.8V/1.2A..
Laser Radiation: To avoid serious eye injury, never look directly into the optical outputs of fiber optic network
equipment, test equipment, patch cords, or test jumpers.
•Always avoid looking directly into the optical output port, when the instrument is working
•Always replace protective dust cap on the detector port when the instrument is not being used
•Always avoid looking directly at unconnected end of optic fiber in testing and make the unconnected end
pointing at a non-reflective object, if possible

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OCC-CWDM-301-18
Table of Contents
1. General Information ............................................................................................................................................6
1.1 Scope of this Manual........................................................................................................................................6
1.2 Unpacking and Inspection................................................................................................................................6
1.3 Introduction......................................................................................................................................................6
2. Basic Operation ....................................................................................................................................................8
2.1 Foreword ..........................................................................................................................................................8
2.2 Instrument Interfaces Instructions....................................................................................................................8
2.3 Use of Batteries ................................................................................................................................................9
2.4 Keypad Functions...........................................................................................................................................10
3. Basic Information of OTDR..............................................................................................................................11
3.1 Principle of OTDR .........................................................................................................................................11
3.2 Basic Definition and Classification of Events................................................................................................11
3.2.1 Events......................................................................................................................................................11
3.3 Measurement Application of OTDR ..............................................................................................................13
3.3.1 Measurement Contents of OTDR............................................................................................................13
3.3.2 Trace Analysis of OTDR.........................................................................................................................13
3.4 Trace Display Screen of OTDR......................................................................................................................13
3.4.1 Trace Display of OTDR ..........................................................................................................................14
3.4.2 Information Window of OTDR...............................................................................................................14
3.4.3 Menu Bar and Window of OTDR...........................................................................................................17
3.5 Battery Recharge Status .................................................................................................................................32
4. Trace Measurement and Processing of Existing Traces.................................................................................33
4.1 Instructions on GUI........................................................................................................................................33
4.2 Trace Measurement of OTDR........................................................................................................................34
4.2.1 Trace Measurement- Connect Optical Fiber............................................................................................34
4.2.2 Trace Measurement - Parameter Configuration ......................................................................................34
4.2.3 Trace Measurement- Auto.......................................................................................................................35
4.2.4 Trace Measurement - Manual..................................................................................................................36
4.2.5 Trace Measurement -Reasons of Measurement Failures.........................................................................36
4.3 Information Window......................................................................................................................................37

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4.3.1 Switch between Information Window Items...........................................................................................37
4.3.2 Review Event List ...................................................................................................................................37
4.3.3 Review Marker A/B Information ............................................................................................................37
4.4 Zoom in Trace Horizontally...........................................................................................................................37
4.5 Zoom out Trace Horizontally.........................................................................................................................38
4.6 Zoom in Trace Vertically ...............................................................................................................................38
4.7 Zoom out Trace Vertically .............................................................................................................................38
4.8 Re-analyze the trace .......................................................................................................................................38
4.9 Save Trace......................................................................................................................................................39
4.10 Browse Saved Traces ...................................................................................................................................40
4.11 Upload Saved Traces....................................................................................................................................40
4.12 Alter Measurement in Realtime Testing.......................................................................................................41
5. Maintenance and Calibration............................................................................................................................42
5.1 Maintenance and Replacing of Batteries........................................................................................................42
5.2 Cleaning of Interfaces.....................................................................................................................................42
5.3 Calibration Requirements...............................................................................................................................43
6. Warranty Information.......................................................................................................................................44

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1. General Information
1.1 Scope of this Manual
Thank you for your purchase from Precision Rated Optics. Please read this manual carefully before use. Always
observe the warnings and cautions appearing throughout this manual.
This manual contains the information necessary for proper operation and maintenance of your equipment,
troubleshooting instructions as well as information regarding obtaining services.
This instrument is carefully assembled and undergo a rigorous mechanical, electrical, and optical inspection prior
to shipment. Beside the instrument, the package should also include a data transfer cable, a power adapter, a PC
Analysis software installation disk and this users’ manual etc. For detailed information, refer to the packing list
Upon receiving the instrument, please check for any obvious signs of physical damage that may have occurred
during shipment. Report any damage to the shipping agent or the representative of the Provider immediately.
Retain the original packing materials in case reshipment becomes necessary.
1.2 Unpacking and Inspection
This instrument has been carefully packed in accordance with standard shipping procedures. Examine the
instrument for damage that may have occurred during shipment. If you find any damage or the instrument is not
working, or if any of the following items are not included, please contact your representative of the Provider.
1.3 Introduction
The OCC-CWDM-301-18 Series Handheld CWDM Optical Channel Checker is specially designed for CWDM
installation, maintenance and troubleshooting, which is able to measure and monitor power values of up to 18
CWDM channels. The OCC-CWDM-301-18 Series can replace high-cost Spectrometers and conduct quick and
reliable measurements in all environments. Thanks for its light, compact and sturdy design, the OCC-CWDM-
301-18 Series is the ideal tool for CWDM installation and maintenance technicians.
Features:
Basic applications:
•Clear TFT LCD display (320×240)
•18-channel measurement: Model OCC-CWDM-301-18B, 1271-1611nm
•8-channel measurement: Model OCC-CWDM-301-18A, 1471-1611nm
•Result display in histogram and list
•Applicable to normal optical power measurement
•Internal clock & fiber S/N editable
•User definable threshold setting
•Data Transfer to PC via USB
•No warm-up, quick start

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OCC-CWDM-301-18
•Backlight
•10 hours continuous operation
•Pocketsize, lightweight and easy-to-use
•CE, FCC certificates
Result display in histogram and list
Straightforward result display for easy understanding.
Internal clock & fiber S/N editable
Internal clock enables OCC-50 to save test data with time and editable fiber SN information for convenient
archiving and editing.

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2. Basic Operation
2.1 Foreword
This part introduces the basic operation on the OTDR. Specific operations of each type instrument are elaborated
in Chapter 3 of this manual. Please read this manual carefully for optimal operation. Should you encounter any
problems during operation, you are welcome to contact the technical staff of our company or representatives.
2.2 Instrument Interfaces Instructions
Figure 2-1. Coping of OTDR
AC Power Jack
Power adapter jack requirements: 13.8V [email protected].
Data Transfer Port
For all types, there are USB interface and RS232 interface. This interface is used to transfer saved traces in the
instrument to a PC for further analysis by associated trace manager.
Power/Charge Indicator
When measurement power on or charging, the relevant indicator will be lightened.
Caution
Invisible laser radiation
Please always avoid looking directly at the optical output or stare at laser beam.

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OCC-CWDM-301-18
2.3 Use of Batteries
Battery for OTDR is NiMH battery.
Cautions during Operation:
The following may bring auto power off of the instrument:
•The instrument will be auto power off when there is insufficient power during operation and low power
will be shown on the LCD.
•If unused for a long time and cause insufficient power, the instrument will be power off several seconds
after powering on so as to protect the batteries in case of excessive discharging. The inside batteries
should be recharged immediately through adapter.
•Please charge only when battery remaining capacity is low or adapter should be unplugged. Irregular
charging operation may seriously shorten battery life.
Cautions in Recharge:
•Quick charge is needed first and then switch to trickle charge after the voltage reaches a predefined
Figure. Quick charge temperature is +5~+45℃, and trickle charge temperature is 0~+55℃, suitable for
indoors. Battery will not be full or be damaged if the charging temperature is beyond the above range,
which may shorten batter life.
•3 hours for quick charge;
•Do not charge for over 8 hours

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2.4 Keypad Functions
[On/Off] Power on or off
Under GUI, Press to start measurement. While testing, press this key to stop
measurement
Enter Under GUI, press this key to confirm the current operation
Together with [Shift/ ], can browse the event list downwards
▲ ▼
Move menu bar in menu operation
Highlight the icon to be operated
Adjust parameter in parameter configuration
Together with [Shift/ ], can zoom out or zoom in trace vertically
◄►
Select parameter to be adjusted in parameter configuration
Move marker leftwards or rightwards in Trace operation
Turn page while in Help sub-menu
Together with [Shift/ ], can zoom out or zoom in trace horizontally
Read help when power on
Cancel the current operation
Exit menu configuration
Switch between information Windows
Together with [Shift/ ], can review the event list upwards
[Shift/ ] This is the hot key to active the integration function by being pressed together with
other keys. Besides, by pressing this key singly under the GUI of displaying trace, the
trace can be resumed to the original size without any zoom

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OCC-CWDM-301-18
3. Basic Information of OTDR
3.1 Principle of OTDR
OTDR (Optical Time Domain Reflectometer) is a measurement instrument for identifying optic fiber transmission
features. The instrument is mainly used to measure attenuation of a whole optic fiber chain and provide
attenuation details relating to length, namely detect, locate and measure any event in optic fiber chain (events
refer to faults caused by welding, connectors, and bending whose transmission change can be measured). Its non-
destructive, one-end connection and rapid measurement has made the OTDR an indispensable tool for
manufacture, construction, and maintenance of optic fiber.
The faults and heterogeneity of optic fiber itself cause Rayleigh scattering of light pulse transmitted in optic fiber.
Part of light pulse is scattered in the reverse direction, and this is called Rayleigh backward scattering, which
actually provides attenuation details relating to length.
Information relating to distance is obtained through time information (that’s the reason why there is “time
Domain” in the name of OTDR). Fresnel reflection occurs at the boundary between two media of different IOR
(for example, connections of faults, connectors, or optic fiber end). This reflection is used to locate the
discontinuous points on optic fiber. The magnitude of reflection depends on the difference between IOR and the
smoothness of boundary.
OTDR sends out a light pulse into connected optic fiber, and receive reflections of events and backward scattering
power of pulse in time. Locus will be displayed on LCD. The y-axis is dB value of backward scattering power,
and the x-axis is the distance.
3.2 Basic Definition and Classification of Events
3.2.1 Events
Events refer to any abnormal points causing attenuation or sudden change of scattering power besides the normal
scattering of optic fiber, which include all kinds of losses like bending, connections and ruptures.
Events points displayed on LCD are abnormal points that cause traces to deviate from straight line.
Events can be classified as reflection events and non-reflection events.

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3.2.1.1 Reflection Events
When some pulse energy is scattered, reflection events happen. When reflection event occurs, peak shows on
trace, as shown in Figure 3-1.
Figure 3-1. Reflection Event
3.2.1.2 Non-Reflection Events
Non-reflection events happen at certain points where there is some optic loss but no light scattering. When non-
reflection event occurs, a power decline shows on trace, as in Figure 3-2.
Figure 3-2. Non-reflection Event
3.2.1.3 Inspection Events
OTDR sends off a light pulse into the optic fiber to be inspected, and then receive returning light signals, and
starts calculating the “event” distance. The farther the distance is, the longer time need for scattered light to be
received by the instrument. Event distance can be calculated according to the time of receiving events signals.
Through inspection of scattered signals, properties of optic fiber, connectors and tie-ins can be identified.

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OCC-CWDM-301-18
3.3 Measurement Application of OTDR
OTDR displays power relating to distance of returning signals. This information can be used to identify the main
properties of an optic fiber chain.
3.3.1 Measurement Contents of OTDR
•Event location (distance), end or rupture of optic fiber chain
•Attenuation coefficient of fiber
•Loss of a single event (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
3.3.2 Trace Analysis of OTDR
The trace analysis of OTDR is fully automatic. The trace locates:
•Reflection events of connections and mechanic tie-ins
•Non-reflection events (usually at welding tie-ins)
•End of optic fiber.
Through scanning the first loss event that is larger than end threshold, end of optic fiber can be identified.
•Events list, event type, loss, reflection and distance.
3.4 Trace Display Screen of OTDR
Trace displays on OTDR screen, as in Figure 3-3.
Figure 3-3. Trace Display Screen
8Km/Div 5.00dB/Div trace1
No.: 2/ 4
Attn.:0.220
Location : 25.308km
Refl.:-38.12dB Ins.l: 0. 85dB
Cum.l: 5. 57dB
Menu
Bar
Trace
Display
Window
Information
Window B
A
Event

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3.4.1 Trace Display of OTDR
This window displays the trace after one measurement.
Definition of Trace:After one measurement, reflection power diagram will be displayed as distance function.
This diagram is referred to as trace.
Trace of OTDR displays measurement result in a graphic form. The y-axis stands for power, and the x-axis stands
for distance, as shown in Figure 3-4.
Reflection
Attenuation
Relative power
Distance
Figure 3-4. Traces and Coordinates
3.4.2 Information Window of OTDR
Contents of this window: measurement parameters, events list, marker A/B and analysis parameters.
3.4.2.1 Measurement Trace Parameters
Important measurement and analysis parameters always display in the information window as shown in
Figure 3-5.(a), (b):
Figure 3-5.(a) Measurement Trace Parameters
30s
80km
1.4666 2.5us
1550nm
Avg.Time:
Range:
IOR :PulseWidth:
Wavelength:
8Km/Div 5.00dB/Div trace1Para-1
B
A
Samp.Dist.: 5.11m

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OCC-CWDM-301-18
Figure 3-5.(b) Analysis Trace Parameters
For definitions and configurations of items in Figure 3-5.(a) (Avg. time, sample distance, Range, IOR, wave
length and pulse width) showed in the interface, please refer to parameter configuration.
For definitions of items in Figure 3-5.(b) (date, reflection threshold, non-reflection threshold, end threshold,
scattering coefficient), please refer to parameter configuration.
3.4.2.2 Events List
To indicate the location of events inspected. Any defined posts will be displayed in event list, for example, non-
reflection event like welding points and reflection event like connectors, as shown in Figure 3-6.
Figure 3-6. Events List
Four types of events:
Begin end; Reflection event；Fiber end; Attenuation event;
Loc: Distance from beginning point to event;
Refl: Magnitude of reflection;
Insl: Loss of Inserted event;
Attn: Attenuation characteristic from one event point to the current event.
Date:27-May-2005 09:15
NRefl.Thre.: -52.00
Refl.Thre.: 3.00
End Thre.: -51.50
0.20 Scat.Coef.:
8Km/Div 5.00dB/Div trace1Para-2
B
A
No.: 2/4
Attn.: 0. 220
Location: 25.308km
Refl.:-38.12dB Ins.L.: 0. 85dB
Cum.L.: 5.57dB
8Km/Div 5.00dB/Div trace1Event
B
A

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Cuml: Cumulative loss, calculating from beginning point to the current event.
3.4.2.3 Information of Marker A/B
Marker is used to mark and analyze a single event, trace section and distance. Distance, attenuation, loss at marker
or between markers will be displayed in information of markers, as shown in Figure 3-7.
Figure 3-7. Information of Marker A/B
The following parameters are measured between marker A and B. When you change either marker, record will
change accordingly.
•“A-B”: Distance between two markers
•“2 points loss”: Loss between two markers; power difference between two markers
•“2 points attenuation”: 2 points loss of unit length
The specific operations of the above are to be elaborated afterwards.
3.4.2.4 Information of Fiber
Information of fiber includes total attenuation, length and loss of the tested fiber. As shown in figure 3-8.
A-B : 9.274km1 .710dB
0.180dB/km
2Pt.Loss :
2Pt.Atten:
8Km/Div 5.00dB/Div trace1Marker
B
A
File: trace1
14.920dB
0.240dB/km
Total Attn.:
Length:
8Km/Div 5.00dB/Div trace1Fiber
B
A
62.180km Loss:

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OCC-CWDM-301-18
Figure 3-8. Information of Fiber
3.4.3 Menu Bar and Window of OTDR
3.4.3.1 Menu Bar and Icons of OTDR
Icon Description
Parameter configuration
Save file
Open file
Re-analyze the trace
Zoom in trace horizontally
Zoom out trace horizontally
Zoom in trace vertically
Zoom out trace vertically
B
A
Switching between markers
Review events list upwards
Review events list downwards
Battery power indicator
Note
•Under Help Menu, only No.1 and 3 are operational
•In the process of measurement, all function on menu bar will be disabled
•No.3, 4, 5, 6, 7, 8 and 9 are tools for trace analysis; No.10 and 11 are tools for reviewing events list
•No.1 is elaborated in Figure 3.4.3.2

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3.4.3.2 Parameter Configuration on OTDR Menu Bar
Correct parameter configuration is a necessity for accurate measurement; therefore, necessary configuration must
be performed before using the instrument. Please refer to the following examples:
Use [▲] and [▼] to highlight, i.e. parameter configuration, then press [Enter], as shown in Figure 3-9;
Press [ ] to exit.
Figure 3-9. (a) Parameter Configuration
Figure 3-9. (b) Parameter Configuration
Ave.Time:
Range:
IOR :
8Km/Div 3.50dB/Div trace1.trc 15:20
1.4666 1550nm
Wavelength:
B
A
30s
80km 2500ns
Range
Wavelength 1550nm
PulseWidth Auto
Avg.Time 30s
IOR 1.4666
Nrefl.Thre. 0.20dB
Refl.Thre.-52.00dB
End Thre. 3.00dB
Scat.Coef. -52.1dB
Averaging
Meas.Mode
Auto
VFL Off
Length Units Meter[m ]
B
A
1.4666 1550nm
Ave.Time:
Range:
IOR :Wavelength:
8Km/Div 3.50dB/Div trace1.trc 15:20
B
A
30s
80km 2500ns
Pulsewidth:
Load Default
Help
Lang./语言
LCD Contrast
Auto Off Off
English
NRefl.Thre. 0.20dB
Refl.Thre.-52.00dB
End Thre. 3.00dB
Scat.Coef. -52.1dB
Delete File
Time( y- m - d) 2005-05-27 10:30:20
Color Mode Color 2

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Definitions of Measurement Parameters
Parameter Definition of Parameter
Range Length of optic fiber relevant to the trace
Pulse Width Width of laser pulse sending out from OTDR to optic fiber
Average Time To select suitable testing time.
Wave length To select laser wave length for measurement
Measurement Mode To select mode for measurement
VFL(option) Power on or off visible laser
Length Units To select length units
IOR IOR of optic fiber which affects the transmission speed of laser
Scatter Coefficient Which affects backward scatter power of laser in fiber
Non reflection threshold Events whose insertion loss is greater than the threshold displays here
Reflection threshold Reflection events GE the threshold will be displayed.
End threshold The first event with insertion loss GE the threshold is considered the end of fiber,
and all following events will be ignored
Delete Files Delete stored trace data in the instrument
Time Show current system time
Auto Off On or off of Auto off function
Lang Choose the language
LCD contrast Adjust the contrast of LCD to select
Color mode setting Select suitable displaying color setting
Load Default Set all parameters to factory setting
Help Show help files (Quick Reference)

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Range Configuration
Generally, range will be set according to actual length of optic fiber, so as to insure the accuracy of measurement.
Under the menu of parameter configuration, use [▲] and [▼] to highlight “Range”; Press [Enter] to enter, as
shown in Figure 3-10; press [ ] to exit.
Figure 3-10. Set Range
Use [▲] and [▼] to select adequate range; Press [Enter] to confirm.
Note
•“Auto” means the automatic measurement. When this function is selected, the instrument will
automatically make an intelligentized selection of adequate range and pulse width for measurement. The
whole process of measurement does not need any intervention of the operator
•“Auto” means the default setting
Pulse Width Configuration
The selection of pulse width affects the dynamic range and resolution of measurement trace. With narrow pulse
width, there will be higher resolution and smaller dead zone, however, the dynamic range will be decreased. On
the contrary, wide pulse width can bring higher dynamic range and measure comparatively long distance, but
resolution and dead zone will be affected. Therefore, users should make choice between dynamic range and dead
zone.
There will be different pulse width options for reference according to different range of distance being chosen.
Under menu of parameter configuration, use [▲] and [▼] to highlight “Pulse Width”; Press [Enter] to select as
shown in Figure 3-11. Press [ ] to exit.
3.00dB
30s
80km
1.4666 2500ns
1550nm
Ave.Time:
Range:
IOR :Pulsewidth:
Wavelength:
8Km/Div 3.50dB/Div trace1.trc 15:20
Auto
1.3km
2.5km
5.0km
10km
20km
40km
80km
120km
B
A
30s
80km 2500ns
Range
Wavelength 1550nm
PulseWidth Auto
Avg.Time 30s
IOR
1.4659
Nrefl.Thre.
0.20dB
Refl.Thre.
-52.00dB
End Thre.
3.00dB
Scat.Coef.
-51.50dB
Averaging
Meas.Mode
Auto
Auto
1.3km
2.5km
5km
10km
20km
40km
80km
240km
300m
160km
VFL
Length Units