EXFO VFL Manuale utente

User Guide

Power Meter and VFL

ii Power Meter and VFL

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: 3.0.0

Contents

Power Meter and VFL iii

Contents

1 Introducing the Optional Power Meter and VFL ....................................... 1

Conventions ............................................................................................................................1

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

Certification Information ........................................................................................................2

2 Using the Optional Power Meters and VFL ................................................. 3

Nulling Offsets ........................................................................................................................4

Setting Thresholds and Correction Factors ..............................................................................5

Setting Reference Values on Your Power Meter ......................................................................9

Measuring Power or Insertion Loss .......................................................................................10

Saving Results Files ...............................................................................................................17

Opening Result Files .............................................................................................................18

Clearing Measurements from the Display .............................................................................19

Adding Information to Your Results ......................................................................................20

Generating Result Reports ...................................................................................................21

Identifying Fiber Faults Visually with the VFL ........................................................................23

3 Maintenance and Troubleshooting ........................................................... 25

Viewing Online Documentation ............................................................................................25

Installing a Unit You Have Purchased Separately ...................................................................25

Recalibrating the Unit ...........................................................................................................26

Contacting the Technical Support Group ..............................................................................28

Transportation ......................................................................................................................28

4 Warranty ..................................................................................................... 29

General Information .............................................................................................................29

Liability .................................................................................................................................30

Exclusions .............................................................................................................................31

Certification ..........................................................................................................................31

Service and Repairs ...............................................................................................................32

EXFO Service Centers Worldwide ..........................................................................................33

Index ................................................................................................................ 35

Power Meter and VFL 1

1 Introducing the Optional

Power Meter and VFL

Your unit can be equipped with an optical power meter to measure

absolute power (dBm or W) or insertion loss (dB). The power meter can

detect modulated signals (1 kHz, 2 kHz, 270 Hz and 330 Hz).

The built-in power meter can also include a visual fault locator (VFL) to

inspect or identify fibers.

Conventions

Before using the product described in this guide, 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.

Introducing the Optional Power Meter and VFL

2Power Meter and VFL

Safety Information

The laser and electrical safety information pertaining to your unit is specific

to the unit you are using. Please refer to the corresponding user

documentation for more details.

Certification Information

The certification and declaration of conformity for your unit is specific to

the unit you are using. Please refer to the corresponding user

documentation for more details.

Power Meter and VFL 3

2 Using the Optional Power

Meters and VFL

Note: If a feature is only available for one type of power meter, it is indicated

specifically in the corresponding title or instructions.

Note: Some buttons are not available when you first access the Power Meter

application, but will be available after you tap Add for the first time or after

you open a file.

Below is a description of the Power Meter buttons and functions.

Selected wavelength

To switch between

available power meter

wavelengths

To take a new reference

measurement

Measured power or insertion loss

To switch between dB, dBm

and W as measurement units

To store a reading to the

Measurements window

To activate VFL and

change VFL mode

To perform an offset

nulling

Using the Optional Power Meters and VFL

4Power Meter and VFL

Nulling Offsets

Temperature and humidity variations affect the performance of electronic

circuits and optical detectors, which can offset measurement results. To

compensate for this offset, the unit is equipped with an offset nulling

function.

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.

To perform an offset nulling:

1. Tighten the protective cap on the power meter port.

2. From the Instrument View tab, tap Offset Nulling.

The nulling process may take a moment, depending on the type of power

meter you are using.

IMPORTANT

Light must not reach the detector when nulling offsets. Always use

an EUI or protective screw cap. Do not use a soft rubber cover.

Using the Optional Power Meters and VFL

Power Meter and VFL 5

Setting Thresholds and Correction Factors

You can define thresholds to specify acceptable power or insertion loss

values for each wavelength. Thresholds are usually supplied by system

manufacturers and depend on the system deployed.

When the measurement status is “Pass”, the value is displayed in green in

the Instrument View tab, on the Measurements list, and in reports.

When the measurement status is “Fail”, the value is displayed in white over

a red background in the Instrument View tab, on the Measurements list

and in reports.

Note: A power measurement (in dBm) will be considered as “Fail” when its value

is outside the defined absolute power threshold.

Note: An insertion loss measurement (in dB) will be considered as “Fail” when its

value is greater than the insertion loss threshold.

You must select the pass/fail status feature for the application to take into

account the defined thresholds and display the appropriate status icons. By

default, this feature is not selected.

Using the Optional Power Meters and VFL

6Power Meter and VFL

Setting Thresholds and Correction Factors

You may apply a correction factor (CF) to measured power to compensate

for inaccuracies or drifts. You should change the CF after performing an

offset nulling.

where:

Powercorrected = the corrected power value

Powermeasured = the measured power value

CF = the correction factor

For each favorite wavelength, the CF is set to 1.00 at the factory, but

allowed values range between 0.85 and 1.15.

Note: Some other products express the CF in dB, so the CF would be added to

measured power.

IMPORTANT

If you revert to factory settings, you will erase all your thresholds

and correction factors. The pass/fail status feature will be disabled

automatically.

Powercorrected Powermeasured CF=

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