EXFO FOT-930 User Manual

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FOT-930

Multifunction Loss Tester

User Guide

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Copyright © 2004–2013 EXFO Inc. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form, be it electronically, mechanically, or by any other means such as photocopying, recording or otherwise, without the prior written permission of EXFO Inc. (EXFO).

Information provided by EXFO is believed to be accurate and reliable. However, no responsibility is assumed by EXFO for its use nor for any infringements of patents or other rights of third parties that may result from its use. No license is granted by implication or otherwise under any patent rights of EXFO.

EXFO’s Commerce And Government Entities (CAGE) code under the North Atlantic Treaty Organization (NATO) is 0L8C3.

The information contained in this publication is subject to change without notice.

Trademarks

EXFO’s trademarks have been identified as such. However, the presence or absence of such identification does not affect the legal status of any trademark.

Units of Measurement

Units of measurement in this publication conform to SI standards and practices.

Version number: 8.0.0

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Contents

Certification Information ....................................................................................................... vi

1 Introducing the FOT-930 Multifunction Loss Tester ................................... 1

Main Features .........................................................................................................................1

Power Sources ........................................................................................................................4

Typical Applications ................................................................................................................4

Conventions ............................................................................................................................5

2 Safety Information ....................................................................................... 7

Other Safety Symbols on Your Unit .........................................................................................8

Laser Safety Information (Units without VFL) ..........................................................................9

Laser Safety Information (Units with VFL) ...............................................................................9

Electrical Safety Information .................................................................................................10

3 Getting Started with Your Multifunction Loss Tester .............................. 13

Turning the Unit On and Off .................................................................................................13

Using Menus and Keypad .....................................................................................................14

4 Customizing Your Multifunction Loss Tester ............................................ 17

Selecting the Language of Operation ...................................................................................17

Setting the Date and Time ....................................................................................................18

Adjusting the Brightness and Contrast .................................................................................19

Activating and Setting Screen Saver and Auto-Off ................................................................20

5 Setting Up Your Multifunction Loss Tester ............................................... 21

Installing the EXFO Universal Interface (EUI) .........................................................................21

Cleaning and Connecting Optical Fibers ...............................................................................22

Setting Autonaming Scheme ................................................................................................24

Setting Pass/Fail Thresholds ..................................................................................................26

6 Measuring Power or Loss .......................................................................... 29

Defining the List of Favorite Wavelengths .............................................................................30

Nulling Electrical Offsets .......................................................................................................32

Referencing Your Power Meter to a Source ...........................................................................33

Measuring Power or Loss ......................................................................................................36

Automatically Detecting Wavelength ....................................................................................39

7 Measuring Optical Return Loss ................................................................. 41

Performing ORL Reference and Setting ORL Zero Value ........................................................42

Performing and Saving ORL Measurements ..........................................................................43

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Contents

8 Performing Automated IL/ORL/Length Measurements (FASTEST) ...............47

Setting Up the FASTEST ........................................................................................................48

Referencing Units for FASTEST .............................................................................................49

Performing the FASTEST .......................................................................................................52

9 Managing Test Results ................................................................................55

Viewing and Deleting Results ...............................................................................................55

Checking Available Memory ..................................................................................................56

Transferring Test Results to a Computer ................................................................................56

10 Using a Light Source ...................................................................................59

11 Identifying Fiber Faults Visually ................................................................61

12 Inspecting Fibers with the FIP ....................................................................63

13 Communicating with Other Users .............................................................65

Sending and Receiving Text Messages ..................................................................................65

Communicating by Voice ......................................................................................................68

14 Maintenance ................................................................................................71

Cleaning EUI Connectors ......................................................................................................71

Cleaning Detector Ports ........................................................................................................74

Cleaning VFL-Type Connectors ..............................................................................................75

Recharging Main Batteries ....................................................................................................76

Replacing Batteries ...............................................................................................................77

Battery Safety Information ....................................................................................................78

Recalibrating the Unit ...........................................................................................................79

Upgrading the Embedded Software .....................................................................................80

Recycling and Disposal (Applies to European Union Only) ....................................................80

15 Troubleshooting ..........................................................................................81

Solving Common Problems ...................................................................................................81

Obtaining Online Help ..........................................................................................................85

Contacting the Technical Support Group ..............................................................................86

Transportation ......................................................................................................................87

16 Warranty ......................................................................................................89

General Information .............................................................................................................89

Liability .................................................................................................................................90

Exclusions .............................................................................................................................90

Certification ..........................................................................................................................90

Service and Repairs ...............................................................................................................91

EXFO Service Centers Worldwide ..........................................................................................92

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Contents

A Technical Specifications ............................................................................. 93

Index ................................................................................................................ 95

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Certification Information

North America Regulatory Statement

This unit was certified by an agency approved in both Canada and the United States of America. It has been evaluated according to applicable North American approved standards for product safety for use in Canada and the United States.

Electronic test and measurement equipment is exempt from FCC part 15, subpart B compliance in the United States of America and from ICES-003 compliance in Canada. However, EXFO Inc. makes reasonable efforts to ensure compliance to the applicable standards.

The limits set by these standards are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the user guide, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense.

Modifications not expressly approved by the manufacturer could void the user's authority to operate the equipment.

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DECLARATION OF CONFORMITY

Application of Council Directive(s): 1999/5/EC – The R&TTE Directive

2011/65/UE – Restriction of the use of certain hazardous substances (RoHS)

And their amendments

Manufacturer’s Name and Address:

EXFO Inc. EXFO Europe Ltd.

400 Godin Avenue Winchester House Quebec City, Quebec School Lane, Chandlers Ford G1M 2K2, CANADA SO53 4DG, UK Tel.: +1 418 683-0211 Tel.: +44 2380 246 800

Equipment Type/Environment: Test & Measurement / Industrial Trade Name/Model No.: Multifunction Loss Tester—FOT-930 MaxTester

Standard(s) to which Conformity is declared:

EN 61010-1:2010 Edition 3.0

Safety requirements for electrical equipment for measurement, control, and laboratory use

– Part 1: General requirements

EN 61326-1:2006

Electrical equipment for measurement, control and laboratory use – EMC requirements

– Part 1: General requirements

EN 60825-1:2007 Edition 2.0

Safety of laser products – Part 1: Equipment classification and requirements

I, the undersigned, hereby declare that the equipment specified above conforms to the above Directive and Standards.

Manufacturer:

Stephen Bull, E. Eng Vice-President Research and Development

400 Godin Avenue, Quebec City, Quebec G1M 2K2 CANADA January 31, 2013

Certification Information

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1 Introducing the FOT-930

DC connector

Battery charge

status LEDs

RS-232 connector

Shoulder strap eyelet

Stand

Display

Keypad

Multifunction Loss Tester

The FOT-930 Multifunction Loss Tester integrates a power meter and light sources with an optical return loss meter, optional talk set and visual fault locator.

Main Features

The unit features FASTEST™, EXFO’s one-touch automated measurement. In 10 seconds, you can simultaneously test IL and ORL at up to four wavelengths, in both directions. During the same test, the unit also determines fiber length.

The power meter has the following characteristics:

 Ge, GeX or InGaAs detector with 40 calibrated wavelengths to measure

absolute power or link loss

 Editable list of favorite wavelengths for easy access

 Modulated signal detection

Multifunction Loss Tester 1

 Automatic wavelength detection from compatible sources

 No offset nulling required in normal operation

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Introducing the FOT-930 Multifunction Loss Tester

Headset connector

Inspection probe connector

Ta l k set p o rt

Power meter detector port

Visual fault locator port

and soft cap

Singlemode port (F

ASTEST, light

source and ORL meter)

Multimode port

ASTEST and light source)

Main Features

Note: Optical ports and connectors may differ from the illustration.

The light source has the following characteristics:

 Singlemode port (two or three wavelengths), also used for FASTEST and

ORL.

AND/OR

Multimode port (two wavelengths), also used for F

ASTEST only.

 Modulated or high-power signal compatible with other EXFO units

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Introducing the FOT-930 Multifunction Loss Tester

Safety label and serial number (under the stand)

Battery compartment (two rechargeable batteries)

Quick reference labels

Main Features

Other test utilities:

 Text messaging

 Full-duplex digital talk set (optional)

 Visual fault locator to inspect or identify fibers (optional)

 Video fiber inspection probe (optional)

Result processing and analysis features (also available in the Optical Report Viewer application):

 Customizable test thresholds with visual pass/fail analysis

 Memory for 1024 results and possible data transfer to a computer for

analysis with the Optical Report Viewer software

 FASTEST results displayed according to FTTx usage and terminology

Other useful characteristics:

 Energy-saving features: automatic backlight or unit shutdown

 Multilingual graphical user interface

 Comprehensive online help available from each function and Quick

Reference labels affixed to back of unit

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Introducing the FOT-930 Multifunction Loss Tester

Pow er So urces

Power Sources

The unit operates with the following power sources:

 AC adapter/charger (connected to standard power outlet—indoor use

only). Compatible car outlet adapter available upon request

 One or two Lithium-Ion rechargeable batteries (automatically take

over if you unplug the AC adapter/charger)

 Field-changeable without affecting operation

 Automatic recharge when AC adapter/charger connected

 CR2032-type Lithium cell battery (for clock only, used when

Lithium-Ion batteries and DC power are both unavailable)

IMPORTANT

Batteries are not charged at the factory. Fully charge them (about 4 hours) before using the unit for the first time.

Typical Applications

You can use the Multifunction Loss Tester for several applications, such as:

 Fiber installation and maintenance applications

 FTTx: testing of passive optical networks (PONs)

 Absolute power or link loss measurements

 Bidirectional loss and ORL testing

 Length measurement

 All-in-one tool for contractors

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Introducing the FOT-930 Multifunction Loss Tester

Conventions

Before using the product described in this manual, you should understand the following conventions:

WARNING

Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury. Do not proceed unless you understand and meet the required conditions.

CAUTION

Indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury. Do not proceed unless you understand and meet the required conditions.

CAUTION

Indicates a potentially hazardous situation which, if not avoided, may result in component damage. Do not proceed unless you understand and meet the required conditions.

IMPORTANT

Refers to information about this product you should not overlook.

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2 Safety Information

WARNING

Do not install or terminate fibers while a light source is active. Never look directly into a live fiber and ensure that your eyes are protected at all times.

WARNING

The use of controls, adjustments and procedures other than those specified herein may result in exposure to hazardous situations or impair the protection provided by this unit.

IMPORTANT

When you see the following symbol on your unit , make sure that you refer to the instructions provided in your user documentation. Ensure that you understand and meet the required conditions before using your product.

IMPORTANT

Other safety instructions relevant for your product are located throughout this documentation, depending on the action to perform. Make sure to read them carefully when they apply to your situation.

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Safety Information

Other Safety Symbols on Your Unit

One or more of the following symbols may also appear on your unit.

Symbol Meaning

Direct current

Alternating current

Both direct and alternating current

The unit is equipped with an earth (ground) terminal.

The unit is equipped with a protective conductor terminal.

The unit is equipped with a frame or chassis terminal.

On (Power)

Off (Power)

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Safety Information

Affixed to back

(under the stand)

Indicated on

connector panel

Laser Safety Information (Units without VFL)

Your instrument is a Class 1 laser product in compliance with standards IEC 60825-1: 2007 and 21 CFR 1040.10, except for deviations pursuant to Laser Notice No. 50, dated June 24, 2007. Invisible laser radiation may be encountered at the output port.

The following label indicates that a product contains a Class 1 source:

Laser Safety Information (Units with VFL)

Your instrument is a Class 3R laser product in compliance with standards IEC 60825-1: 2007 and 21 CFR 1040.10, except for deviations pursuant to Laser Notice No. 50, dated June 24, 2007. Laser radiation is emitted at the output port. It is potentially harmful in direct intrabeam viewing.

The following label(s) indicate that the product contains a Class 3R source:

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Safety Information

Electrical Safety Information

The AC adapter/charger provided with this unit is specifically designed to work with your product.

Use only accessories that meet EXFO specifications.

EXFO guarantees the specifications and viability of the products ONLY if they are used with chargers and batteries provided by EXFO.

 Use the external power supply indoors only.

WARNING

CAUTION

WARNING

 Operation of any electrical instrument around flammable gases

or fumes constitutes a major safety hazard.

 To avoid electrical shock, do not operate the unit if any part of

the outer surface (covers, panels, etc.) is damaged.

 Use only the AC adapter/charger provided by EXFO with your

unit.

 Use only the car outlet adapter designed for your unit and

approved by EXFO. The car outlet adapter contains a replaceable fuse. Replace the damaged fuse ONLY with a fuse of the same type: 3AG certified, 16 VDC, 3 A, with an I

40 A

sec and 80 A2sec.

 When you use the unit outdoors, ensure that it is protected

from liquids, dust, direct sunlight, precipitation, and full wind pressure.

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Safety Information

Electrical Safety Information

Equipment Ratings

Temp er at ur e

 Operation

 Storage

Relative humidity

 unit

 AC adapter

-0 °C to 40 °C (32 °F to 104 °F)

-40 °C to 70 °C (-40 °F to 158 °F)

 95 % non-condensing

0 % to 80 % non-condensing

Maximum operation altitude 5000 m (6562 ft)

Pollution degree 2 (connected to AC mains)

3 (powered by batteries)

Overvoltage category

 unit

 AC adapter

Input power

 unit

 AC adapter

120 V, 14.4 W, 60 Hz

9 - 16 V; 12 W

230 V, 17 W, 50 Hz

a. Measured in 0 °C to 31 °C (32 °F to 87.8 °F) range, decreasing linearly to 50 % at 40 °C (104 °F) b. For indoor use only.

c. Equipment is normally protected against exposure to direct sunlight, precipitations and full wind pressure.

d. Not exceeding ± 10 % of the nominal voltage

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3 Getting Started with Your

Multifunction Loss Tester

CAUTION

To avoid damaging your unit, use it only with modules approved by EXFO.

Turning the Unit On and Off

When you turn the unit on, you may use it immediately under normal conditions (while the source offers good startup performance, you should allow a 5-minute warmup).

When the unit is turned off, it keeps the following parameters in its internal memory:

 FASTEST parameters

 Current power meter wavelength and list of favorite wavelengths

 User-defined thresholds

 Autonaming settings

 Regional, LCD and energy-saving settings

 Saved values and test results

IMPORTANT

If you remove batteries (and the AC adapter/charger is unplugged), the unit will turn off without saving the above elements.

The date and time will be lost only if you remove the clock battery.

Note: To ensure that the power is completely turned off, disconnect the AC

adapter/charger and remove the batteries.

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Getting Started with Your Multifunction Loss Tester

To activate the function

displayed directly above

To move around, select items, and change parameters

To access F

ASTEST

To access the main menu

To access help about current function

To adjust brightness (four levels)

To turn unit on/off

(blinks when idle or

when probe is active)

To cancel/exit current function

Keypad

To scroll through available functions

Using Menus and Keypad

To turn the unit on:

Press . The unit initializes for a few seconds and displays the Power Meter pane.

To turn the unit off:

Hold down the button for two seconds.

Using Menus and Keypad

You can access optical tools from the keypad or menu. Menu options may differ depending on your unit configuration.

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Getting Started with Your Multifunction Loss Tester

Power meter status (detected modulation)

Source/F

ASTEST/ORL meter status (active wavelength

or detected modulation)

VFL status (on/off)

Current date and time

Battery number/status and DC power status

Talk set status (seeking or connected)

Status Bar

Using Menus and Keypad

To access main features:

1. Press the Menu key.

2. Use the arrows to select feature and press Enter.

To activate F1/F2 functions:

1. Use the left/right function arrows (beside F1/F2 keys) to make the

desired function or parameter visible.

2. Press the F1 or F2 key located just below.

To access and modify on-screen parameters:

1. Use the arrows to select an on-screen item (drop-down list, keyboard,

check box, etc.).

2. Press Enter to activate or open it.

To enter text or numbers with an on-screen keyboard:

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 Use the left/right function arrows (beside F1/F2 keys) to move the

 Use the up/down and left/right arrows to select a character, then press

 Press OK (F1/F2 key) to accept the element and hide the keyboard.

cursor in the text.

Enter to add it.

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4 Customizing Your

Multifunction Loss Tester

Selecting the Language of Operation

You may display the user interface in one of six languages (default is English). If other languages become available in the future, you could access them by replacing the unit software (see Upgrading the Embedded Software on page 80). Values are kept in memory when you turn the unit off. You may also revert to factory settings at any time.

To select a new interface language:

1. Press Menu, then select Setup > Unit.

2. Press Next Tab (F1/F2 key) until you get to

the Regional tab.

3. Use the arrows to select the Language list, then press Enter to open it.

4. With the current language highlighted, use the up/down arrows to select the desired language, then press Enter to activate it.

To revert unit to factory-default settings:

1. Press Menu, then select Setup > Unit.

2. Press Factory Settings (F1/F2 key). Values on all tabs of the Unit Setup

pane are returned to factory settings.

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Customizing Your Multifunction Loss Tester

Setting the Date and Time

The current date and time are displayed on the status bar. When saving results, the unit also saves the corresponding date and time.

You must enter the date according to the year-month-day format and the time according to the 24-hour format.

Note: A dedicated clock battery keeps the date and time accurate. For details, see

Replacing Batteries on page 77.

To set the date and time:

1. Press Menu, then select Setup > Unit.

2. Press Next Tab (F1/F2 key) until you get to

the Regional tab.

3. Use the arrows to select any of the date or time settings, then press Enter to display the

on-screen keyboard (for details about using

keyboards, see Using Menus and Keypad on page 14).

4. Set the new value and press OK (F1/F2 key).

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Customizing Your Multifunction Loss Tester

Adjusting the Brightness and Contrast

To fit your work environment, you may adjust the LCD brightness and contrast. Values are kept in memory when you turn the unit off. You may also revert to factory settings at any time.

Note: These settings do not apply to the Fiber Inspection Probe display. For

details, see Inspecting Fibers with the FIP on page 63.

To adjust the display brightness and contrast:

Press the key repeatedly to switch between brightness levels (0-4-7-10).

1. Press Menu, then select Setup > Unit.

2. Press Next Tab (F1/F2 key) until you get to

the LCD tab.

3. Use the up/down arrows to select the Brightness or Contrast slider.

4. Use the left/right arrows to adjust the brightness or contrast level.

To revert unit to factory-default settings:

1. Press Menu, then select Setup > Unit.

2. Press Factory Settings (F1/F2 key). Values on all tabs of the Unit Setup

pane are returned to factory settings.

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Customizing Your Multifunction Loss Tester

Activating and Setting Screen Saver and Auto-Off

When you do not use the unit for a while, the display may be dimmed to save power. Your unit may also turn itself off completely.

You can set idle durations for DC and battery operation. Values are kept in memory when you turn the unit off. You may also revert to factory settings at any time.

Note: The ON/OFF button blinks to indicate screen saver activation, but unit

operation is not interrupted. Press any key to deactivate the screen saver.

To activate/deactivate the screen saver or auto-off:

1. Press Menu, then select Setup > Unit.

2. Press Next Tab (F1/F2 key) until you get to

the Power tab (for auto-off) or Display tab (for screen saver).

3. Use the up/down arrows to select the battery or AC adapter duration list, then press Enter to open the list.

4. With the current duration highlighted, use the up/down arrows to select the desired duration (or Never), then press Enter to confirm.

To revert unit to factory-default settings:

1. Press Menu, then select Setup > Unit.

2. Press Factor y Settings (F1/F2 key). Values on all tabs of the Unit Setup

pane are returned to factory settings.

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5 Setting Up Your Multifunction

Bare metal

(or blue border)

indicates UPC

option

Green border indicates APC

option

2 3 4

Loss Tester

Installing the EXFO Universal Interface (EUI)

The EUI fixed baseplate is available for connectors with angled (APC) or non-angled (UPC) polishing. A green border around the baseplate indicates that it is for APC-type connectors.

To install an EUI connector adapter onto the EUI baseplate:

1. Hold the EUI connector adapter so the dust cap opens downwards.

2. Close the dust cap in order to hold the connector adapter more firmly.

3. Insert the connector adapter into the baseplate.

4. While pushing firmly, turn the connector adapter clockwise on the

baseplate to lock it in place.

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Setting Up Your Multifunction Loss Tester

Cleaning and Connecting Optical Fibers

IMPORTANT

To ensure maximum power and to avoid erroneous readings:

 Always inspect fiber ends and make sure that they are clean as

explained below before inserting them into the port. EXFO is not responsible for damage or errors caused by bad fiber cleaning or handling.

 Ensure that your patchcord has appropriate connectors. Joining

mismatched connectors will damage the ferrules.

To connect the fiber-optic cable to the port:

1. Inspect the fiber using a fiber inspection microscope. If the fiber is

clean, proceed to connecting it to the port. If the fiber is dirty, clean it as explained below.

2. Clean the fiber ends as follows:

2a. Gently wipe the fiber end with a lint-free swab dipped in isopropyl

alcohol.

2b. Use compressed air to dry completely.

2c. Visually inspect the fiber end to ensure its cleanliness.

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Setting Up Your Multifunction Loss Tester

Cleaning and Connecting Optical Fibers

3. Carefully align the connector and port to prevent the fiber end from touching the outside of the port or rubbing against other surfaces.

If your connector features a key, ensure that it is fully fitted into the port’s corresponding notch.

4. Push the connector in so that the fiber-optic cable is firmly in place, thus ensuring adequate contact.

If your connector features a screwsleeve, tighten the connector enough to firmly maintain the fiber in place. Do not overtighten, as this will damage the fiber and the port.

Note: If your fiber-optic cable is not properly aligned and/or connected, you will

notice heavy loss and reflection.

EXFO uses good quality connectors in compliance with EIA-455-21A standards.

To keep connectors clean and in good condition, EXFO strongly recommends inspecting them with a fiber inspection probe before connecting them. Failure to do so will result in permanent damage to the connectors and degradation in measurements.

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Setting Autonaming Scheme

Initially, the unit suggests cable and fiber names based on autonaming settings. After saving a result, the unit prepares the next fiber name by incrementing the suffix (or by adding “001” to a name with no suffix).

When you manually change the name for the first time (in Power Meter,

ORL Meter or F

ASTEST), the unit then ignores autonaming settings.

IMPORTANT

To start using new autonaming settings, you must delete all cables from memory.

 Cable names: maximum 21 characters for prefix, 3 digits for number

(or 24 characters when name is manually set)

 Fiber names: maximum 12 characters for prefix, plus 3-digit suffix

(duplicate names allowed when name is manually set)

Note: If you manually change a fiber name, then turn the unit off without saving

at least one result, this name will be discarded.

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Setting Autonaming Scheme

To set the autonaming scheme:

1. Press Menu, then select Setup > Data

Autonaming.

2. Use the arrows to select the cable prefix, cable number or fiber prefix.

3. Press Enter to display the on-screen

keyboard (for details about using keyboards, see Using Menus and

Keypad on page 14).

4. Set the name/value, then press OK (F1/F2 key) to hide the keyboard.

To revert to the factory-default autonaming scheme:

1. Press Menu, then select Setup > Data Autonaming.

2. Press Factory Settings (F1/F2 key).

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Setting Pass/Fail Thresholds

You can define five groups of thresholds to specify acceptable loss (in dB and dB per distance unit) and ORL values (in dB) for each wavelength, for both singlemode and multimode fibers.

Thresholds are supplied by system manufacturers and depend on the system deployed.

Each time a measurement exceeds a threshold, the result is shown with a red background and an exclamation mark in the table.

IMPORTANT

Thresholds are not saved with measurements. Results are compared to the threshold group currently active on the unit where results are viewed (for F

Note: When transferring results from handheld unit to computer, thresholds are

not transferred along with results. However, you can define thresholds in the Optical Report Viewer application.

ASTEST results, not necessarily the master unit).

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Setting Pass/Fail Thresholds

To set loss or ORL thresholds:

1. Press Menu, then select Setup >

Thresholds.

2. Use the arrows to select a threshold group in the Current list. Select None to deactivate all thresholds.

3. Use the arrows to select:

 a fiber mode (singlemode or multimode)

 loss units (dB or dB/distance; distance units are selected in FASTEST

setup)

Note: When feet is the current distance unit, you must set thresholds in dB/kft to

obtain meaningful values.

4. Use the arrows to select a value in the table (under the Loss or ORL columns), then press Enter to display the on-screen keyboard (for details about keyboards, see Using Menus and Keypad on page 14).

5. Set the threshold, then press OK (F1/F2 key) to hide the keyboard. The value must be within your unit’s loss/ORL range.

Thresholds are saved only when you turn the unit off.

To rename a threshold group:

1. From the Thresholds pane, use the arrows to select the Current list,

then press Enter to open it.

2. With the current group highlighted, use the up/down arrows to select the desired group, then press Enter to activate it.

3. Press Rename (F1/F2 key) to display the on-screen keyboard (for details about keyboards, see Using Menus and Keypad on page 14).

4. Set the new group name (maximum 10 characters), then press OK (F1/F2 key).

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6 Measuring Power or Loss

Power meter port

Open list or press Wavelength to

switch between favorite wavelengths.

Press Setup to modify the list

of favorite wavelengths

or activate auto-detection.

Measured power/loss

Modulation detected

(PM if no modulation)

Open list or press W/dBm/dB to display power (W or dBm) or loss (dB).

Press Reference to set new reference for loss measurement.

Open lists to change cable/fiber name of next saved data.

Press Store to save current value under displayed name.

The FOT-930 Multifunction Loss Tester is equipped with an optical power meter to measure absolute power (in dBm or W) or insertion loss (in dB). The power meter port is independent of the F

The following functions are available on your power meter:

ASTEST port.

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Measuring Power or Loss

Defining the List of Favorite Wavelengths

You must put the wavelengths you want to use on a list of favorite wavelengths. Only wavelengths selected from this list are available for measurements.

By default, the list contains 22 of the 40 calibrated wavelengths. It can contain a maximum of 30 wavelengths.

Specifications are guaranteed for calibrated wavelengths only. For other wavelengths, the unit will determine values based on the calibrated wavelengths (3-point interpolation).

Detector

Type

InGaAs



 Ge

800, 820, 830, 840, 850, 860, 870, 880, 910, 980, 1270, 1280, 1290, 1300, 1310, 1320, 1330, 1340, 1390, 1450, 1460, 1470, 1480, 1490, 1500, 1510, 1520, 1530, 1540, 1550, 1560, 1570, 1580, 1590, 1600, 1610, 1620, 1630, 1640, 1650.

 GeX All the above, plus 1370 and 1060. Same as above.

Calibrated

Wavelengths (nm)

Default Favorite

Wavelengths (nm)

800, 840, 850, 860, 910, 980, 1280, 1300, 1310, 1320, 1450, 1470, 1480, 1490, 1510, 1520, 1530, 1540, 1550, 1560,1570, 1625.

Note: The list must always contain at least one selected wavelength.

30 FOT-930

Page 39

Measuring Power or Loss

Defining the List of Favorite Wavelengths

To customize the list of favorite and selected wavelengths:

1. Press Menu, then select Setup >

Power Meter.

From the Power Meter pane, press Setup (F1/F2 key).

2. Using the up/down arrows, scroll through the list.

3. Press Enter to select/deselect the highlighted wavelength. An X appears beside selected wavelengths.

4. If a wavelength does not appear on the list, you can add it by pressing Add Wavelength (F1/F2 key). You can also remove a wavelength from the list by pressing Remove Wavelength (F1/F2 key).

5. Repeat these steps for other wavelengths as necessary.

To revert to the factory-default list:

1. Press Menu, then select Setup > Power Meter.

From the Power Meter pane, press Setup (F1/F2 key).

2. Press Factory Settings (F1/F2 key).

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Page 40

Measuring Power or Loss

Nulling Electrical Offsets

Temperature and humidity variations affect the performance of electronic circuits and optical detectors. Nulling the electrical offsets eliminate these effects.

Your unit has been designed not to require offset nulling under normal operation, but you should perform it whenever environmental conditions

change significantly or when measuring very low power values.

IMPORTANT

Light must not reach detectors when nulling offsets. Always use an EUI or protective screw cap. Do not use a soft rubber cover.

Note: Starting a nulling automatically deactivates all light sources on the unit.

To perform an offset nulling:

1. Press Menu, then select Setup > Power Meter.

From the Power Meter pane, press Setup (F1/F2 key).

2. Press Nulling (F1/F2 key).

3. Tighten the protective caps on the power

meter and F

The nulling process takes approximately 10 seconds. Check marks appear next to nulled detectors. If light is still detected, you will need to place the caps properly and restart.

32 FOT-930

ASTEST ports, then press OK.

Page 41

Measuring Power or Loss

Referencing Your Power Meter to a Source

In reference mode, your unit displays the loss created by the fiber under test only, since it subtracts a reference value from the measured power.

In the illustration, the reference value (-36.87 dBm) is subtracted from the actual power measured (-7.89 dBm).

Note: The reference value you set for each wavelength remains in memory until a

new one is set for the same wavelength, even when you turn the unit off.

Compatible sources (such as FOT-300 and FLS-300) can transmit a reference value to your power meter, avoiding the need for manual referencing. This value is not the source’s actual power. It is a user-defined value that may not take the link loss into account.

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Page 42

Measuring Power or Loss

Light source

Power

meter

Adapter

Reference

patchcord

Light source

Power

meter

Adapter

Reference

patchcord

Bulkhead

adapter

Reference patchcord

Referencing Your Power Meter to a Source

To reference the power meter to a source:

1. Press Menu, then select Power Meter.

2. Check your fibers and clean them properly for optimum performance

(see Cleaning and Connecting Optical Fibers on page 22).

3. Using one of the following methods, connect a light source to the power meter port of your unit.

 One single reference patchcord

 Two reference patchcords and a bulkhead adapter

4. Activate the source at the desired wavelength.

5. Match the power meter wavelength with the

source wavelength as follows:

 Press Wave l e n g t h (F1/F2 key) to switch

between favorite wavelengths of your power meter (see Defining the List of Favorite Wavelengths on page 30).

 If the source emits an auto-wavelength signal and auto-detection is

enabled (see Automatically Detecting Wavelength on page 39), the power meter automatically matches the source wavelength.

34 FOT-930

Page 43

Measuring Power or Loss

Referencing Your Power Meter to a Source

6. Press W/dBm/dB (F1/F2 key) until you get dB units to retrieve the last saved reference.

Press Reference (F1/F2 key) to save the current power as the new reference.

Reference power appears (in dBm) and current loss is automatically switched to dB.

7. Repeat the procedure for each wavelength you want to reference.

To receive the reference value from a compatible source:

1. Connect the source to your power meter (with or without a fiber under

test).

2. Use the source to emit the special signal that contains its power value. For more information, refer to the source’s user guide.

 When it detects the special signal, the power meter beeps. The

new reference power is displayed (in dBm) and current loss reading is automatically switched to dB.

 You cannot change the power meter wavelength, units or

reference power manually.

Multifunction Loss Tester 35

Page 44

Measuring Power or Loss

Measuring absolute power or link loss is done the same way, except for the referencing step. You can take power or loss measurements and save them for further analysis.

Connect high-power live fiber to the power meter port only.

To perform power or loss measurements:

1. If necessary, perform an offset nulling (see Nulling Electrical Offsets on

page 32).

2. Press Menu, then select Power Meter.

3. Check your fibers and clean them properly (see Cleaning and

Connecting Optical Fibers on page 22).

4. For loss measurements, reference your power meter to a light source (see Referencing Your Power Meter to a Source on page 33), then deactivate the light source.

CAUTION

5. If you have used a single reference patchcord, disconnect it from the power meter port only, then attach a second reference patchcord to

the power meter.

If you have used two reference patchcords, disconnect both of them at the bulkhead.

36 FOT-930

Page 45

Measuring Power or Loss

Light source

Power

meter

Adapter

Reference patchcord

Fiber

under test

Reference patchcord

Bulkhead

adapter

Bulkhead

adapter

Measuring Power or Loss

6. Using bulkhead adapters or the system patch panels, connect a fiber under test to reference patchcords attached to the light source and power meter.

7. Activate the source at the desired wavelength.

8. Match the power meter wavelength with the source wavelength as

follows:

 Press Wave l e n g t h (F1/F2 key) to switch between favorite

wavelengths of your power meter (see Defining the List of Favorite

Wavelengths on page 30).

 If the source emits an auto-wavelength signal and auto-detection is

enabled (see Automatically Detecting Wavelength on page 39), the power meter automatically matches the source wavelength.

If the unit detects a modulated signal, it beeps and the signal frequency is indicated in the status bar, next to a yellow LED: 2k indicates a 2-kHz signal, 1k a 1-kHz signal, and 270 a 270-Hz signal.

9. Press W/dBm/dB (F1/F2 key) to select the desired power (W or dBm) or loss (dB) unit.

Multifunction Loss Tester 37

Page 46

Measuring Power or Loss

10. Save the displayed values, if desired.

10a.Change the displayed cable and fiber

names as needed.

10b.Press Store (F1/F2 key) to save the

value along with wavelength, reference power, date and time. The fiber name will increment automatically, ready to save the next value.

For details about viewing results, see Managing Test Results on page 55.

11. Repeat the procedure for other wavelengths.

38 FOT-930

Page 47

Measuring Power or Loss

Automatically Detecting Wavelength

Compatible sources (such as FOT-930, FOT-300 and FLS-300) can transmit their wavelength values through the fiber, avoiding the need to manually match the source and power meter wavelengths.

Note: When receiving an auto-wavelength (or Auto-ID) signal, you cannot

manually change the power meter wavelength.

To receive an auto-wavelength signal from a source:

1. Press Menu, then select Setup > Power

Meter.

From the Power Meter pane, press Setup (F1/F2 key).

2. Use the arrows to select Automatic wavelength detection, then press Enter.

3. Connect a compatible source to your unit’s power meter port.

4. Activate the source in Auto-ID mode (FOT-930: see Using a Light

Source on page 59).

Your power meter automatically matches the source wavelength.

Multifunction Loss Tester 39

Page 48

Page 49

7 Measuring Optical Return Loss

ORL meter port

Open lists to change cable/fiber name of next saved data.

Press Store to save current ORL value under displayed name.

Measured ORL

(positive value)

Current ORL wavelength

Open list or press Wavelength to switch between singlemode wavelengths.

Press ORL Zero to calibrate the ORL meter sensitivity.

Press Default ORL Zero to revert to factory-default sensitivity.

Press ORL Reference to set reference

using ORL calibrated patchcord (best).

Press Loopback Ref. to use

any other patchcord.

Optical return loss (ORL) is the total effect of multiple reflections and scattering events within a fiber-optic system.

The FOT-930 Multifunction Loss Tester is equipped with an ORL meter to measure ORL for singlemode fibers. The ORL meter uses the F (singlemode) port only.

The following functions are available on your ORL meter:

ASTEST SM

Multifunction Loss Tester 41

Page 50

Measuring Optical Return Loss

Set

ORL zero

Measure

ORL

Save

results

Perform

ORL reference

Set up thresholds

(see page 26)

Null offsets

(see page 32)

Select

wavelength

Termination Component

under test

Performing ORL Reference and Setting ORL Zero Value

The ORL measurement procedure is outlined below:

Performing ORL Reference and Setting ORL Zero Value

The ORL zero measurement eliminates the effects of backreflection on the link before the component under test, so your unit displays only the backreflection of this component.

You should set a new ORL zero:

 when you change the measurement patchcord (the one connected to

the DUT, not the reference patchcord)

 when you remove a connection between the unit and mandrel

To set the ORL zero value (all wavelengths at once):

1. Press Menu, then select ORL Meter.

2. Press ORL Zero (F1/F2 key).

3. Connect a patchcord to the F

42 FOT-930

ASTEST SM port.

Page 51

Measuring Optical Return Loss

Per f orming and S aving ORL Measurements

4. Terminate the fiber as close as possible before the component under test. Wrap it at least 10 turns around a mandrel or small diameter tool, adding turns until the reading stabilizes.

5. Press OK to save the ORL zero value, then remove the termination.

To revert to the factory-default ORL zero value:

1. Press Menu, then select ORL Meter.

2. Press Default ORL Zero (F1/F2 key).

Performing and Saving ORL Measurements

You can define ORL thresholds (see Setting Pass/Fail Thresholds on page 26) before or after measuring ORL. ORL values below thresholds are displayed in red.

To m ea s ur e O R L:

1. If necessary, perform an offset nulling (see Nulling Electrical Offsets on

page 32).

2. Press Menu, then select ORL Meter.

3. Press Wavelength (F1/F2 key) to select a singlemode wavelength.

4. Verify your patchcords and clean them properly (see Cleaning and

Connecting Optical Fibers on page 22).

Note: If the F

EXFO’s optional ORL calibrated patchcord.

Multifunction Loss Tester 43

ASTEST SM port of your unit is equipped with an APC connector, use

Page 52

Measuring Optical Return Loss

Performing and Saving ORL Measurements

5. Connect one end of a patchcord to the FASTEST SM port of your unit leaving the other end unconnected.

6. Perform an ORL reference as follows:

Note: During the reference, the patchcord end should remain in the air;

reflections occurring at a fiber-to-air interface correspond to a constant of

14.7 dB.

Use the left/right function arrows to display ORL Reference and press the F1 or F2 key to select it.

In the ORL Reference message box, press OK (Enter).

44 FOT-930

Page 53

Measuring Optical Return Loss

Te rm i n at i o nComponent

under test

Per f orming and S aving ORL Measurements

7. Pe rfor m an ORL zero measurement (see Performing ORL Reference and Setting ORL Zero Value on page 42).

8. Terminate the fiber as close as possible after the component under test. Wrap it at least 10 turns around a mandrel or small diameter tool, adding turns until the reading stabilizes.

Note: Avoid bending the fiber between the unit and the termination point.

The displayed value represents the ORL of the component under test.

9. Save the displayed values, if desired.

9a. Change the displayed cable and fiber

names as needed.

9b. Press Store (F1/F2 key) to save the

value along with wavelength, date and time. The fiber name will increment automatically, ready to save the next value.

For details about viewing results, see Managing Test Results on page 55.

10. Repeat procedure for other wavelengths if necessary.

Multifunction Loss Tester 45

Page 54

Page 55

8 Performing Automated

FASTEST singlemode (SM) and multimode (MM) ports

Perform

ASTEST

Perform

reference

Save

results

Set ORL zero

(see page 42)

Null offsets

(see page 32)

Set up

ASTEST

Set up thresholds

(see page 26)

IL/ORL/Length Measurements

ASTEST)

FASTEST allows you to perform 2- or 3-wavelength bidirectional loss and ORL tests for singlemode fibers, or 2-wavelength loss tests for multimode fibers, in 10 seconds (including fiber length measurement).

ASTEST is useful in high-fiber-count installations. Activated at the touch of a

button, F

ASTEST cuts down on training time and provides error-free results.

To use F

ASTEST, you need a compatible unit (such as FTB-3930, FOT-930,

FOT-920 or FTB-3920, but not the FOT-910). The unit at the remote end is only used to establish references. It then waits for commands from the unit initiating F

The F

ASTEST (master).

ASTEST procedure is outlined below:

Multifunction Loss Tester 47

Page 56

Performing Automated IL/ORL/Length Measurements (FASTEST)

(standard wavelengths)

(FTTx wavelengths)

Setting Up the FASTEST

You can configure the FASTEST on the master unit only. The remote unit will automatically adapt to these parameters (F unit are ignored).

Setup includes the following elements:

 Port and DUT (fiber) type: multimode

ASTEST will not include ORL.

 Compatibility: select FOT-930 for fast, two-

or three-wavelength testing including ORL (it requires two FOT-930/FTB-3930). Use FOT-920 when other unit is an FOT-920 or FTB-3920.

 Length units: affects thresholds and fiber length only.

 Mode/wavelengths: select one or more wavelengths for the FASTEST.

Depending on your choice, the F measurements. Selecting FTTx Custom or FTTx All allows you to define upstream and downstream wavelengths.

ASTEST parameters on remote

ASTEST will include loss and/or ORL

 Automatic saving of results: select where results are automatically

stored (remote saving not available with FOT-920). Fiber name automatically increments after each F

 Unit location: in FTTx mode, you specify if the master unit is closer to

ASTEST.

the CO (or to the premises) than the remote unit.

To set up the F

ASTEST:

1. Press Menu, then select Setup > FasTesT.

2. Select the F

48 FOT-930

ASTEST parameters.

Page 57

Performing Automated IL/ORL/Length Measurements (FASTES T)

System

under test

Connector mating

Connector

mating

System

under test

Connector mating

Referencing Units for FASTEST

Referencing subtracts the loss caused by the test setup components from the overall loss measured during F loss inserted by the system under test alone.

Two referencing methods are available:

Side-by-Side Method (Best) Loopback Method

ASTEST. The final result represents the

Description Reference taken with both units

together using their F

ASTEST ports.

Slightly more accurate value than

Reference taken separately on each unit (F

ASTEST port connected

to power meter port).

loopback method.

Location of units Must be at same location. Can be at different locations.

Loss included in

ASTEST result

Elements to consider

Loss due to system under test and one connector mating.

Includes neither an ORL reference nor an ORL zero

measurement. To obtain them,

use the ORL Meter pane (see Performing ORL Reference and

Loss due to system under test and the two connector matings.

When measuring ORL (F

ASTEST or

ORL meter), accounts for connector loss and adjusts ORL calibration accordingly.

Not recommended for short links.

Setting ORL Zero Value on page 42).

With multiple referencing, you may coordinate an FTB-3930 with up to 10 FOT-930 units.

Multifunction Loss Tester 49

Page 58

Performing Automated IL/ORL/Length Measurements (FASTEST)

Reference patchcord

Bulkhead

adapter

Reference patchcord

Referencing Units for FASTEST

To perform a side-by-side reference:

1. On the master unit (the one initiating the

test), press F

ASTEST.

2. In the Ref. Type list, select the Side-by-side reference type, then press Enter. An illustration of the connection is shown with previous reference values (if any).

3. Connect both units through their F

ASTEST ports, using two reference

patchcords and a bulkhead adapter.

4. Press Take Reference (F1/F2 key). After a few seconds, the unit displays new reference values for each wavelength on both units. If values are not acceptable, try to clean connectors and repeat this step.

5. Disconnect the two patchcords from the bulkhead only and connect them to the fiber under test (using bulkhead adapters or the system patch panels).

IMPORTANT

 You can turn off the unit without losing the reference.

 If you disconnect the patchcords from the FASTEST ports, you

must take a new reference.

50 FOT-930

Page 59

Performing Automated IL/ORL/Length Measurements (FASTES T)

Reference patchcord

Adapter

Referencing Units for FASTEST

To perform a loopback reference:

1. Press F

ASTEST.

2. In the Ref. Type list, select the Loopback reference type, then press Enter. An illustration of the connection is shown with previous reference values (if any).

3. Connect a reference patchcord from the F

ASTEST

port to the power meter adapter.

4. Press Take Reference (F1/F2 key). After a few seconds, the unit displays new reference values for each wavelength. If values are not acceptable, try to clean connectors and repeat this step.

5. Disconnect the reference patchcord from the power meter adapter only and connect it to the fiber under test.

IMPORTANT

 You can turn off the unit without losing the reference.

 If you disconnect the patchcord from the FASTEST port, you must

take a new reference.

6. Repeat the procedure with the second unit.

Multifunction Loss Tester 51

Page 60

Performing Automated IL/ORL/Length Measurements (FASTEST)

Reference patchcord

Fiber

under test

Reference patchcord

Bulkhead

adapter

Bulkhead

adapter

Per for ming th e FASTEST

Performing the FASTEST

Although FASTEST requires two units (one at each end of the fiber under test), you initiate it from only one (the master). Both units use F settings from the master unit.

ASTEST

To p er f or m a F

Unit A (Master) Unit B

ASTEST:

1. If necessary, null the offsets (see

Nulling Electrical Offsets on page 32).

2. Clean your fibers properly (see

Cleaning and Connecting Optical Fibers on page 22).

3. Set up the F

ASTEST (see Setting Up the

FasTesT on page 48).

4. If you are testing ORL, perform an ORL zero measurement from the ORL

Meter pane (see Performing ORL Reference and Setting ORL Zero Value

on page 42).

5. Reference your unit (see Referencing Units for FasTesT on page 49).

6. Connect reference patchcord to fiber under test (as shown):

1. If necessary, null the offsets.

2. Clean your fibers properly.

3. If you are testing ORL, perform an

ORL zero measurement from the ORL Meter pane.

4. Reference your unit.

5. Connect reference patchcord to fiber

under test (as shown):

52 FOT-930

Page 61

Performing Automated IL/ORL/Length Measurements (FASTES T)

Open lists to select cable/fiber name for data to be saved.

Press Store to save results under displayed name.

Press Next Tab to switch

to next result type.

Red/exclamation mark indicates result that exceeds threshold.

Disk icon would indicate

unsaved results.

Press Setup to modify

ASTEST parameters.

(FTTx view)

Performing the FASTEST

Unit A (Master) Unit B

7. From the F

ASTEST pane, set the next

cable/fiber names as needed (used for automatic save).

8. Press the F

ASTEST key or press Start

Test (F1/F2 key).

The units establish communication and automated tests begin. Measurements appear on both units as they are taken.

9. Save the displayed values if you want. If Auto save was activated for one or both units, results are already saved.

9a. Change the displayed cable and

fiber names as needed.

9b. Press Store (F1/F2 key) to save

the values. The fiber name increments automatically, ready to save the next value.

If you are not satisfied with the results, press F

For details about viewing FASTEST results, see Managing Test Results on page 55.

Multifunction Loss Tester 53

ASTEST and redo the test.

Page 62

Page 63

9 Managing Test Results

Open lists to select cable/fiber name of data to recall.

Press Next Fiber or Next Cable to switch between available results.

Press Next Tab to switch

to next result type.

Red/exclamation mark indicates result that exceeds threshold.

Press Delete Fiber or Delete Cable to remove data from list.

Press Delete All Cables to free memory.

(standard view)

Viewing and Deleting Results

You can save up to 1024 results (FASTEST, power/loss and ORL) in your unit, along with references and date/time of tests. You will save and recall this data according to cable and fiber names.

IMPORTANT

The date and time of FASTEST references are not saved. They are displayed with the results immediately after the test only.

To view and process test results:

Press Menu, then select Results/Information > Cable Results. The following functions are available when viewing results:

IMPORTANT

 You cannot recover deleted results. Ensure that you transfer

your data to a computer if you intend to use it later.

 Deleting a single cable/fiber does not free memory. To free

memory, you must delete all cables at once.

Note: For more accuracy, the average is always calculated from loss values in W

and then converted to dB.

Multifunction Loss Tester 55

Page 64

Managing Test Results

Serial port

(male DB9)

RS-232

connector

Checking Available Memory

You can save up to 1024 results in the unit memory.

To view the available memory on your unit:

Press Menu, then select Results/Information > Unit Info.

Transferring Test Results to a Computer

Using an appropriate serial cable and the Handheld Data Transfer software, you can transfer results from your handheld unit to a computer or FTB-500. This way, you can increase storage capacity, perform better analyses on test results and create reports.

Transferred files are not automatically deleted from your unit.

To transfer test results to a computer:

1. Using the serial cable, connect your unit to an available COM port of

the computer.

IMPORTANT

Note: If your computer is not equipped with an RS-232 port, you can use a USB

adapter. After installing the proper drivers, your computer should associate the adapter to an available COM port.

56 FOT-930

Page 65

Managing Test Results

Transferring Test Results to a Computer

2. Turn on both the computer and your handheld unit. Ensure that your unit will remain on during the transfer (connect it to a power outlet and deactivate auto-off).

3. On the computer, launch the Handheld Data Transfer application and start the operation.

Note: For details about setting up the software and transferring data, refer to the

Handheld Data Transfer online help.

Multifunction Loss Tester 57

Page 66

Page 67

10 Using a Light Source

Source singlemode (SM) and multimode (MM) ports

Your unit may contain two source ports: a 2- or 3-wavelength singlemode port and a 2-wavelength multimode port, depending on the configuration (see Technical Specifications on page 93).

The source signal can be continuous (CW or high-power) or modulated (270 Hz, 1 kHz or 2 kHz) and uses the F

 CW signal (the default): constant power over the temperature range,

but about 3 dB lower than maximum.

 High-power signal: reaches maximum power, but its power slightly

varies over the temperature range.

A special Auto ID signal can transmit its wavelength value, to facilitate

wavelength detection by a compatible unit.

WARNING

When a source is active, its port emits invisible laser radiation. Avoid exposure and do not stare directly into the beam. Ensure that any unused port is properly protected with a cap.

ASTEST ports.

 The Power Meter pane remains displayed

when you use the source.

 If you switch to power meter or VFL while a

source is active, the Source pane remains displayed.

 When you switch sources, the modulation

remains the same. It is indicated in the Source pane.

Multifunction Loss Tester 59

Page 68

Using a Light Source

 Only one source/wavelength may be active at a time. The active port

(SM or MM) is indicated in the Source pane.

 The source status is indicated with a LED in the status bar and with the

Active indicator under the keypad.

Note: The Active indicator always shows the source, VFL, ORL meter or talk set

port status (even in FIP or idle mode).

To activate a light source:

1. Connect the fiber under test to the source port (see Cleaning and

Connecting Optical Fibers on page 22).

2. Press Menu, then select Source/VFL > Source (units with a VFL) or Source (units with no VFL).

3. Press Wavelength (F1/F2 key) to activate each available source in turn.

Use the arrows to open the wavelength/status list and select the desired wavelength.

To deactivate a light source:

Press Wave l e n g t h (F1/F2 key) until you get past the last source. The list displays Off.

Use the arrows to open the wavelength list and select Off.

To change the signal modulation:

1. Activate the source if you want.

2. Press Modulation (F1/F2 key) to switch

between available modulations.

3. Use the arrows to open the list and select the desired modulation.

60 FOT-930

Page 69

11 Identifying Fiber Faults

Visually

The visual fault locator (VFL) helps you identify bends, faulty connectors, splices and other causes of signal loss.

From its dedicated port, the VFL emits a red signal which becomes visible at the location of a fault on the fiber. This signal can be continuous (CW, the default) or blinking (1 Hz).

WARNING

When the VFL is active, the VFL port emits visible laser radiation. Avoid exposure and do not stare directly into the beam. Ensure that any unused port is properly protected with a cap.

 The Power Meter pane remains displayed

when you use the VFL.

 If you switch to source or power meter while

the VFL is active, the VFL pane remains displayed.

 The VFL status is indicated with a LED in the

status bar and with the Active indicator under the keypad.

Note: The Active indicator always shows the source, VFL, ORL meter or talk set

port status (even in FIP or idle mode).

Multifunction Loss Tester 61

Page 70

Identifying Fiber Faults Visually

The red light indicates that the VFL is on.

To activate the VFL and inspect a fiber:

1. Connect the fiber under test to the VFL port

(see Cleaning and Connecting Optical Fibers on page 22).

2. Press Menu, then select Source/VFL > VFL.

3. Press VFL On/Off (F1/F2 key) to activate the VFL (list displays On).

Use the arrows to open the VFL status list and select On.

4. To switch between blinking (1 Hz) and continuous (CW) signals, press Modulation (F1/F2 key).

Use the arrows to open the list and select the desired modulation.

5. Without looking directly into the beam, examine the fiber. If light is coming out of the rubber jacket or on the side of the ferrule, the fiber is defective.

6. Deactivate the VFL by pressing VFL On/Off (F1/F2 key).

62 FOT-930

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12 Inspecting Fibers with the FIP

The fiber inspection probe allows you to find dirty or damaged connectors by displaying an enlarged view of the connector surface.

The following common features of video fiber inspection probes are compatible with your unit:

 Magnification control: supports 200x, 400x or other zoom factors.

 Focus control: allows you to fine-tune the display quality.

 Image capture: freezes the image on the FOT-930 display by pressing a

button.

For more information, refer to the user guide that came with your probe.

IMPORTANT

 When another unit requests a FASTEST with your unit, the FASTEST

takes over and Probe mode is interrupted.

 You cannot receive text messages or talk set calls while using

Probe mode.

To access Probe mode on your unit:

1. Connect the probe to the right side of the unit, using an adapter if

necessary.

2. Activate the probe display using one of the following:

 Press Menu, then select Probe.

 Press the button on the probe (some models only).

To adjust brightness or contrast:

 Brightness: use up/down arrows.

 Contrast: use left/right arrows.

To exit Probe mode and return to the regular display:

Press Esc or Menu.

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13 Communicating with Other

Users

Your Multifunction Loss Tester offers two ways to communicate:

 text messages

 voice (via the optional talk set)

Sending and Receiving Text Messages

To facilitate communication between opposite ends of a fiber (especially on models with no talk set), you may send text messages to compatible units (such as FOT-930, FTB-3930, FOT-920 or FTB-3920) through their

ASTEST ports.

It is possible to send a predefined message or to write one of your own (maximum 30 characters). However, custom messages are deleted when you turn the unit off.

IMPORTANT

 The messaging feature does not work with the talk set port.

 The messaging feature will not work if both units try to send a

message at the same time.

 You cannot use other features while sending or receiving a

message.

 You cannot cancel the operation.

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Communicating with Other Users

Sending and Receiving Text Messages

To add a custom text message to the list:

1. Press Menu, then select

Talk Set/Messages > Messages (units with a talk set) or Messages (units with no talk set).

2. Using the up/down arrows, scroll through the list and select a message to use as a basis.

3. Press New Message (F1/F2 key).

4. Enter or change the message text using the on-screen keyboard and

press OK (F1/F2 key). The message is added to the list.

To send a text message:

1. Connect the units at each end of the same fiber via their F

2. On the sending unit, press Menu, then select

Talk Set/Messages > Messages (units with a talk set) or Messages (units with no talk set).

ASTEST ports.

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Communicating with Other Users

Sending and Receiving Text Messages

3. Ensure that the port indicated (SM or MM) is the one you use. Otherwise, press Port Setup (F1/F2 key) and change it, then return to the Messages pane.

4. Using the up/down arrows, scroll through the list and select the message.

5. Press Send (F1/F2 key).

After a few seconds, your message will automatically appear on the receiving unit. If an incompatible unit (or no unit) is detected at the other end, or if the F

ASTEST port of the receiving unit is in use, an error message

will appear.

When you receive a message:

Your unit emits a short beep and displays the received message.

 Press OK to clear the display and return to your previous function.

 Press Reply to access the Messages pane and reply to the message.

You will then need to use the menu to return to your previous function. However, your last readings will be lost.

Note: If the message was written with a language not supported by your unit, you

will see unreadable characters only.

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Communicating with Other Users

Tal k s e t po r t

Communicating by Voice

With the optional talk set, you can establish full-duplex digital voice communication over a dedicated fiber, even while other functions are in use.

The talk set provides adjustable headset volume and uses a dedicated port. It is not compatible with the FOT-920 or FTB-3920 talk sets.

Note: You may use any commercially available headset equipped with a

microphone.

While communication is established, the actions and displays of each unit may differ as follows:

 You can send or receive a call at any time, except during a FASTEST.

 Once communication is established, it will be maintained even if you

use the unit’s other test tools (including F

 If communication is lost, calling unit will automatically try to

ASTEST).

reestablish communication.

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Communicating with Other Users

Communicating by Voice

To communicate between units:

Calling Unit Receiving Unit

1. Connect the calling unit to one end of the fiber via its talk set port, and plug in your headset.

2. Press Menu, then select Talk Set/Messages > Talk Set.

1. Connect the receiving unit to the other end of the fiber via its talk set port, and plug in your headset.

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Communicating with Other Users

Communicating by Voice

Calling Unit Receiving Unit

3. Press Talk . Your unit establishes communication with receiving unit.

When receiving the call, the unit rings 3 times. A phone icon appears to indicate that communication is established.

If no compatible unit is detected at the other end, a message appears.

4. Talk to the receiving unit. 2. Simply answer (no need to press a

key).

5. To end the communication, press End from the Talk set pane.

3. To end the communication, press End from the Talk s et pane.

To adjust the headset volume (calling or receiving unit):

1. Press Menu, then select Tal k Set/ Me s sa g e > Talk Set .

2. Using the left/right arrows, adjust the volume level.

You cannot adjust or mute the ring sound.

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14 Maintenance

To help ensure long, trouble-free operation:

 Always inspect fiber-optic connectors before using them and clean

them if necessary.

 Keep the unit free of dust.

 Clean the unit casing and front panel with a cloth slightly dampened

with water.

 Store unit at room temperature in a clean and dry area. Keep the unit

out of direct sunlight.

 Avoid high humidity or significant temperature fluctuations.

 Avoid unnecessary shocks and vibrations.

 If any liquids are spilled on or into the unit, turn off the power

immediately, disconnect from any external power source, remove the batteries and let the unit dry completely.

The use of controls, adjustments and procedures other than those specified herein may result in exposure to hazardous situations or impair the protection provided by this unit.

WARNING

Cleaning EUI Connectors

Regular cleaning of EUI connectors will help maintain optimum performance. There is no need to disassemble the unit.

IMPORTANT

If any damage occurs to internal connectors, the module casing will have to be opened and a new calibration will be required.

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Maintenance

Push

Tur n

Pull

Cleaning EUI Connectors

Looking into the optical connector while the light source is active WILL result in permanent eye damage. EXFO strongly recommends to TURN OFF the unit before proceeding with the cleaning procedure.

To clean EUI connectors:

1. Remove the EUI from the instrument to expose the connector

baseplate and ferrule.

2. Moisten a 2.5 mm cleaning tip with one drop of isopropyl alcohol (alcohol may leave traces if used abundantly).

WARNING

3. Slowly insert the cleaning tip into the EUI adapter until it comes out on the other side (a slow clockwise rotating movement may help).

4. Gently turn the cleaning tip one full turn, then continue to turn as you withdraw it.

5. Repeat steps 3 to 4 with a dry cleaning tip.

Note: Make sure you don’t touch the soft end of the cleaning tip.

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Maintenance

Cleaning EUI Connectors

6. Clean the ferrule in the connector port as follows:

6a. Deposit one drop of isopropyl alcohol on a lint-free wiping cloth.

IMPORTANT

Isopropyl alcohol may leave residues if used abundantly or left to evaporate (about 10 seconds).

Avoid contact between the tip of the bottle and the wiping cloth, and dry the surface quickly.

6b. Gently wipe the connector and ferrule.

6c. With a dry lint-free wiping cloth, gently wipe the same surfaces to

ensure that the connector and ferrule are perfectly dry.

6d. Verify connector surface with a portable fiber-optic microscope

(for example, EXFO’s FOMS) or fiber inspection probe (for example, EXFO’s FIP).

7. Put the EUI back onto the instrument (push and turn clockwise).

8. Throw out cleaning tips and wiping cloths after one use.

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Maintenance

Cleaning Detector Ports

Regular cleaning of detectors will help maintain measurement accuracy.

Always cover detectors with protective caps when unit is not in use.

To clean detector ports:

1. Remove the protective cap and adapter (FOA) from the detector.

2. If the detector is dusty, blow dry with compressed air.

3. Being careful not to touch the soft end of the swab, moisten a cleaning

tip with only one drop of isopropyl alcohol.

Alcohol may leave traces if used abundantly. Do not use bottles that distribute too much alcohol at a time.

IMPORTANT

4. While applying light pressure (to avoid breaking the detector window), gently rotate the cleaning tip on the detector window.

5. Repeat step 4 with a dry cleaning tip or blow dry with compressed air.

6. Discard the cleaning tips after one use.

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Maintenance

Cleaning VFL-Type Connectors

VFL-type connectors are fixed on your unit and can be cleaned using a mechanical cleaner.

WARNING

Verifying the surface of the connector with a fiber-optic microscope WHILE THE UNIT IS ACTIVE WILL result in permanent eye damage.

To clean a connector using a mechanical cleaner:

1. Insert the mechanical into the optical adapter, and push the outer shell

into the cleaner.

Note: The cleaner makes a clicking sound to indicate that the cleaning is done.

2. Verify connector surface with a portable fiber-optic microscope (for

example, EXFO’s FOMS) or fiber inspection probe (for example, EXFO’s FIP).

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Maintenance

Recharging Main Batteries

The main Lithium-Ion batteries will last about 9 hours in normal operation.

 The combined charge status is shown on

the status bar.

 The charge status of each battery is shown

on the Unit Info pane (press Menu, then select Results/Information > Unit Info).

 The unit also indicates the charge status

with LEDs on its left side:

Status LED Battery Charge Status

Green Fully charged

Red Charging

Yellow Error

IMPORTANT

 Batteries are not charged at the factory. Fully charge them

(about 4 hours) before using the unit for the first time.

 Batteries function and charge properly between 0 °C and 45 °C

(32°F and 113°F). Batteries will not charge if the temperature is below -10 °C (14 °F) or above 45 °C (113 °F).

 Never store at temperatures above 60 °C (140 °F).

 Charge only with specified charger.

To recharge the main batteries:

Connect the unit to a power outlet (or car outlet) using the AC adapter/charger. The charge cycle will start and end automatically.

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Maintenance

Replacing Batteries

You may replace main batteries or the clock battery at any time without affecting operation.

The two main Lithium-Ion batteries are independent, so you can replace one while the other is in use. If the unit is plugged in, you can replace both batteries while the unit is on.

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Maintenance

Battery Safety Information

Only use an EXFO battery. Batteries from other suppliers could result in serious damage to your unit, or personal injuries. Contact EXFO for more information.

Do not throw batteries into fire or water and do not short-circuit the batteries’ electrical contacts. Do not disassemble.

To replace main batteries:

1. Open the battery compartment door located at the

back of the unit.

2. Replace one or both batteries, respecting the polarity.

3. Close the battery compartment door.

WARNING

To replace the clock battery:

1. Open the battery compartment door located at the

back of the unit.

2. Remove main batteries to reveal the clock battery door.

CAUTION

To reduce the risk of damage due to electrostatic discharge, touch grounded unpainted metal before handling the clock battery.

3. Open the clock battery compartment door with a screwdriver.

4. Replace the battery, respecting the polarity as shown.

5. Close the battery compartment doors.

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Maintenance

Recalibrating the Unit

EXFO manufacturing and service center calibrations are based on the ISO/IEC 17025 standard (General Requirements for the Competence of Testing and Calibration Laboratories). This standard states that calibration documents must not contain a calibration interval and that the user is responsible for determining the re-calibration date according to the actual use of the instrument.

The validity of specifications depends on operating conditions. For example, the calibration validity period can be longer or shorter depending on the intensity of use, environmental conditions and unit maintenance, as well as the specific requirements for your application. All of these elements must be taken into consideration when determining the appropriate calibration interval of this particular EXFO unit.

Under normal use, the recommended interval for your FOT-930 Multifunction Loss Tester is: one year.

For newly delivered units, EXFO has determined that the storage of this product for up to six months between calibration and shipment does not affect its performance (EXFO Policy PL-03).

To help you with calibration follow-up, EXFO provides a special calibration label that complies with the ISO/IEC 17025 standard and indicates the unit calibration date and provides space to indicate the due date. Unless you have already established a specific calibration interval based on your own empirical data and requirements, EXFO would recommend that the next calibration date be established according to the following equation:

Next calibration date = Date of first usage (if less than six months after the calibration date) + Recommended calibration period (one year)

To ensure that your unit conforms to the published specifications, calibration may be carried out at an EXFO Service Center or, depending on the product, at one of EXFO’s Certified Service Centers. Calibrations at EXFO are performed using standards traceable to national metrology institutes.

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Maintenance

Upgrading the Embedded Software

Note: The FlexCare warranty program includes Calibration/Verification packages

(see Service and Repairs on page 91).

Upgrading the Embedded Software

To upgrade the unit’s embedded software, you will need to obtain the upgrade files from EXFO’s Technical Support Group. You will also need an RS-232 cable and the Firmware Update application.

IMPORTANT

During software upgrades, you should connect your unit to a power outlet. If problems occur, contact EXFO.

Recycling and Disposal (Applies to European Union Only)

For complete recycling/disposal information as per European Directive WEEE 2012/19/UE, visit the EXFO Web site at www.exfo.com/recycle.

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15 Troubleshooting

Solving Common Problems

Problem Possible Cause Solution

The unit does not turn on.  You did not press

long enough.

 AC adapter/charger not

connected.

 Main batteries

discharged.

 Weather too cold.

The display is almost blank at power-up.

The date returns to 1900-01-01.

Batteries do not charge as expected.

A battery status LED is yellow.

During offset nulling, you get the following message:

“Light detected during nulling.”

Brightness may need some adjustment.

Clock battery is dead. Replace the clock battery

 Temperature is too

high.

 Battery is incorrectly

connected.

Battery is defective. Contact EXFO or replace the

Light reaches at least one detector (power meter or

ASTEST).

 Press for 2 seconds.

 Connect the AC

adapter/charger.

 Charge batteries by

connecting the AC adapter/charger.

Press to adjust brightness properly.

(see Replacing Batteries on page 77).

 Ensure temperature is

within specifications.

 Ensure battery is

connected properly.

battery.

Ensure protective caps are tightly screwed on F and power meter ports and perform the nulling again.

Do not use rubber cover.

ASTEST

When using the power meter, you get Power Too Low or Power Too High.

Multifunction Loss Tester 81

Power of the signal received at the power meter port is outside its measurement range.

Check the connections. Ensure you use the proper fiber and connector type and that you use your power meter within specifications.

Page 90

Troubleshooting

Solving Common Problems

Problem Possible Cause Solution

Unable to change wavelength in Power Meter pane.

Unable to change dB unit or reference power in Power Meter pane.

Unit or reference value you changed are replaced by other values after a while.

When measuring ORL, you get Too Much Power.

When measuring ORL, you get ORL exceeds.

Power meter receives auto-wavelength (Auto-ID) signal.

Power meter receives reference power value from compatible source.

Measured reflected power is higher than emitted power. The ORL reference is incorrect.

Reflection is below sensitivity (Max ORL) of ORL meter.

 Change source’s emitting

mode.

 Deactivate wavelength

detection.

Wait a few seconds until power value is received, then retry.

Always perform ORL reference before each ORL measurement.

Perfo r m an ORL z e r o measurement to increase the sensitivity of the detector.

Ensure mandrel is correct and that patchcord and connectors are in good condition.

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Troubleshooting

Solving Common Problems

Problem Possible Cause Solution

Unable to establish FASTEST communication.

During F

ASTEST, you get a

message saying that loopback reference was not performed.

ORL values are inaccurate for short fibers at 1310 nm during a F

ASTEST.

 Remote unit’s FASTEST

port is in use.

 Remote unit is not

compatible.

 Selected port on master

unit differs from actual port to which fiber is connected.

 Compatibility set to

FOT-930 but remote unit is not an FOT-930 or FTB-3930.

Loopback reference was selected, but not performed (or reference is outdated).

— Measure ORL manually.

 Wait until FASTEST

completes, turn source and ORL meter off or exit Probe mode.

 Make sure remote unit is

an FOT-930, FTB-3930, FOT-920 or FTB-3920.

 Set the port (SM or MM)

correctly in F

ASTEST Setup

on master unit.

 Set the compatibility to

FOT-920 in F

ASTEST Setup

on master unit.

Perform a loopback reference before F

ASTEST measurement.

Unable to communicate with an FOT-920 using the talk set.

Unable to establish connection with

Talk sets of the FOT-920 and FOT-930/FTB-3930 are not compatible.

Probe mode is activated on remote unit (FOT-930 only).

Use text messaging instead.

Deactivate Probe mode.

compatible talk set.

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Troubleshooting

Solving Common Problems

Problem Possible Cause Solution

Unable to send a text message.

 Selected port differs

from actual port to which fiber is connected.

 Receiving unit’s port is

in use.

 Remote unit is not

compatible.

 On the sending unit, set

the correct port (SM or MM) in F

 Wait until FASTEST

ASTEST Setup.

completes, turn source and ORL meter off or exit Probe mode.

 Make sure remote unit is

an FOT-930, FTB-3930, FOT-920 or FTB-3920.

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Troubleshooting

Obtaining Online Help

Context-sensitive help is conveniently available at all times to guide you through the use of your unit.

Most test operations pause while you view help, but will resume automatically when you exit help.

To obtain online help about current function:

Press the ? button from any pane or message box.

To navigate in the online help:

 Use up/down arrows to scroll through help page.

 Use left/right arrows to switch between hyperlinks (underlined items),

then press Enter to link to selected help page.

 Press Next Page to switch between available topics in sequence.

 Press Help Menu to display the main menu of help topics.

 Press Esc to return to your test pane.

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Troubleshooting

Contacting the Technical Support Group

To obtain after-sales service or technical support for this product, contact EXFO at one of the following numbers. The Technical Support Group is available to take your calls from Monday to Friday, 8:00 a.m. to 7:00 p.m. (Eastern Time in North America).

Technical Support Group

400 Godin Avenue Quebec (Quebec) G1M 2K2 CANADA

For detailed information about technical support, and for a list of other worldwide locations, visit the EXFO Web site at www.exfo.com.

To accelerate the process, please have information such as the name and the serial number (see the product identification label), as well as a description of your problem, close at hand.

1 866 683-0155 (USA and Canada) Tel.: 1 418 683-5498 Fax: 1 418 683-9224 support@exfo.com

You may also be requested to provide the firmware version number.

To find out the firmware version number:

1. Press Menu, then select Results/Information > Unit Info.

2. Press About (F1/F2 key).

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Troubleshooting

Transportation

Maintain a temperature range within specifications when transporting the unit. Transportation damage can occur from improper handling. The following steps are recommended to minimize the possibility of damage:

 Pack the unit in its original packing material when shipping.

 Avoid high humidity or large temperature fluctuations.

 Keep the unit out of direct sunlight.

 Avoid unnecessary shocks and vibrations.

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Page 97

16 Warranty

General Information

EXFO Inc. (EXFO) warrants this equipment against defects in material and workmanship for a period of three years from the date of original shipment. EXFO also warrants that this equipment will meet applicable specifications under normal use.

During the warranty period, EXFO will, at its discretion, repair, replace, or issue credit for any defective product, as well as verify and adjust the product free of charge should the equipment need to be repaired or if the original calibration is erroneous. If the equipment is sent back for verification of calibration during the warranty period and found to meet all published specifications, EXFO will charge standard calibration fees.

The warranty can become null and void if:

 unit has been tampered with, repaired, or worked upon by

unauthorized individuals or non-EXFO personnel.

 warranty sticker has been removed.

IMPORTANT

 case screws, other than those specified in this guide, have been

removed.

 case has been opened, other than as explained in this guide.

 unit serial number has been altered, erased, or removed.

 unit has been misused, neglected, or damaged by accident.

THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL EXFO BE LIABLE FOR SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.

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Warranty

Liability

EXFO shall not be liable for damages resulting from the use of the product, nor shall be responsible for any failure in the performance of other items to which the product is connected or the operation of any system of which the product may be a part.

EXFO shall not be liable for damages resulting from improper usage or unauthorized modification of the product, its accompanying accessories and software.

Exclusions

EXFO reserves the right to make changes in the design or construction of any of its products at any time without incurring obligation to make any changes whatsoever on units purchased. Accessories, including but not limited to fuses, pilot lamps, batteries and universal interfaces (EUI) used with EXFO products are not covered by this warranty.

This warranty excludes failure resulting from: improper use or installation, normal wear and tear, accident, abuse, neglect, fire, water, lightning or other acts of nature, causes external to the product or other factors beyond the control of EXFO.

IMPORTANT

In the case of products equipped with optical connectors, EXFO will charge a fee for replacing connectors that were damaged due to misuse or bad cleaning.

Certification

EXFO certifies that this equipment met its published specifications at the time of shipment from the factory.

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Warranty

Service and Repairs

EXFO commits to providing product service and repair for five years following the date of purchase.

To send any equipment for service or repair:

1. Call one of EXFO’s authorized service centers (see EXFO Service

Centers Worldwide on page 92). Support personnel will determine if the equipment requires service, repair, or calibration.

2. If equipment must be returned to EXFO or an authorized service center, support personnel will issue a Return Merchandise Authorization (RMA) number and provide an address for return.

3. If possible, back up your data before sending the unit for repair.

4. Pack the equipment in its original shipping material. Be sure to include

a statement or report fully detailing the defect and the conditions under which it was observed.

5. Return the equipment, prepaid, to the address given to you by support personnel. Be sure to write the RMA number on the shipping slip. EXFO

will refuse and return any package that does not bear an RMA number.

Note: A test setup fee will apply to any returned unit that, after test, is found to

meet the applicable specifications.

After repair, the equipment will be returned with a repair report. If the equipment is not under warranty, you will be invoiced for the cost appearing on this report. EXFO will pay return-to-customer shipping costs for equipment under warranty. Shipping insurance is at your expense.

Routine recalibration is not included in any of the warranty plans. Since calibrations/verifications are not covered by the basic or extended warranties, you may elect to purchase FlexCare Calibration/Verification Packages for a definite period of time. Contact an authorized service center (see EXFO Service Centers Worldwide on page 92).

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Warranty

EXFO Service Centers Worldwide

If your product requires servicing, contact your nearest authorized service center.

EXFO Headquarters Service Center

400 Godin Avenue Quebec (Quebec) G1M 2K2 CANADA

EXFO Europe Service Center

Winchester House, School Lane Chandlers Ford, Hampshire S053 4DG ENGLAND

EXFO Telecom Equipment (Shenzhen) Ltd.

3rd Floor, Building 10, Yu Sheng Industrial Park (Gu Shu Crossing), No. 467, National Highway 107, Xixiang, Bao An District, Shenzhen, China, 518126

1 866 683-0155 (USA and Canada) Tel.: 1 418 683-5498 Fax: 1 418 683-9224 support@exfo.com

Tel.: +44 2380 246800 Fax: +44 2380 246801 support.europe@exfo.com

Tel: +86 (755) 2955 3100 Fax: +86 (755) 2955 3101 support.asia@exfo.com

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