Cleaning Procedures for Lightwave
Test and Measurement Equipment
Pocket Guide
Notices
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Technologies GmbH.
© Copyright 2000 by
Agilent Technologies Deutschland GmbH
Herrenberger Str. 130
71034 Boeblingen
Germany
2
Subject Matter
The information in this document is subject to change without notice. Agilent Technologies makes no warranty of any kind with regard to this printed material, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose.
Agilent Technologies shall not be liable for errors contained herein or for
incidental or consequential damages in connection with the furnishing,
performance, or use of this material and of the recommendations herein.
Warranty
Agilent does not warrant that this pocket guide is uninterrupted or error
free. No other warranty is expressed or implied.
Exclusive Remedies
The remedies provided herein are Buyer’s sole and exclusive remedies.
Agilent Technologies shall not be liable for any direct, indirect, special,
incidental, or consequential damages whether based on contract, tort, or
any other legal theory.
Assistance
Product maintenance agreements and other customer assistance agreements are available for Agilent Technologies products. For any assistance
contact your nearest Agilent Sales and Service Office (see Appendix,
page 40).
Safety Precautions
The general safety precautions must be observed during all phases of
cleaning. Agilent Technologies Inc. assumes no liability for the customer’s failure to comply with these requirements.
3
Content
1.
Safety precautions .................................................................6
2.
Why is it important to clean optical devices?...................8
3.
What do I need for proper cleaning? .................................9
Standard cleaning equipment
Dust and shutter caps .......................................................9
Isopropyl alcohol ................................................................9
Cotton swabs .....................................................................10
Soft tissues .........................................................................10
Pipe cleaners .....................................................................11
Compressed air .................................................................12
Additional Cleaning Equipment
Microscope ........................................................................12
Ultrasonic bath ..................................................................13
Warm water and liquid soap .........................................13
Premoistened cleaning wipes .......................................14
Polymer film .......................................................................14
Infrared sensor card ........................................................14
4.
Preserving connectors ........................................................ 15
4
5.
Cleaning instructions .......................................................... 17
How to clean...
5.1 Connectors ................................................................ 18
5.2 Optical head adapters ............................................ 20
Table to select cleaning method ................................ 21
5.3 Connector interfaces .............................................. 25
5.4 Bare fiber adapters.................................................. 26
5.5 Lenses ........................................................................ 27
5.6 Instruments with a fixed
4.10 connector interface ................................................ 28
5.7 Instruments with an optical glass plate.............. 29
5.8 Instruments with a physical contact
4.10 interface .................................................................... 30
5.9 Instruments with a recessed lens
4.11 interface .................................................................... 32
5.10 Sensitive devices .................................................... 33
5.11 Metal filters or attenuator gratings...................... 34
6.
Additional cleaning information........................................ 35
6.1 Bare fiber ends ........................................................ 35
6.2 Large area lenses and mirrors.............................. 36
6.3 Other cleaning hints ................................................ 38
Appendix
Regional Agilent sales offices worldwide. ................ 40
Your notes................................................................................ 41
5
1. Safety Precautions
The following Cleaning Instructions contain some general safety precautions, which must be observed during all phases of cleaning. Consult your specific optical device manuals or guides for full information
on safety matters.
Please try, whenever possible, to use physically contacting connectors, and dry connections. Clean the connectors, interfaces, and bushings carefully after use.
If you are unsure of the correct cleaning procedure for your optical
device, we recommend that you first try cleaning a dummy or test
device.
Agilent Technologies assumes no liability for the customerís failure to
comply with these requirements.
Please follow the following safety rules.
Do not remove instrument covers when operating.
Ensure that the instrument is switched off throughout the cleaning
procedures.
Use of controls or adjustments or performance of procedures
other than those specified may result in hazardous radiation exposure.
Make sure that you disable all sources when you are cleaning any
optical interfaces.
Under no circumstances look into the end of an optical device
attached to optical outputs when the device is operational. The
laser radiation is not visible to the human eye, but it can seriously
damage your eyesight.
To prevent electrical shock, disconnect the instrument from the
mains before cleaning. Use a dry cloth, or one slightly dampened
with water, to clean the external case parts. Do not attempt to
clean internally.
6
Do not install parts or perform any unauthorized modification to
optical devices.
Refer servicing only to qualified and authorized personnel.
7
2. Why is it important to clean optical devices ?
In transmission links optical fiber cores are about 9 µm (0.00035“) in
diameter. Dust and other particles, however, can range from tenths to
hundredths of microns in diameter. Their comparative size means that
they can cover a part of the end of a fiber core, and thus degrade the
transmission quality. This will reduce the performance of your system.
Furthermore, the power density may burn dust into the fiber and cause
additional damage (for example, 0 dBm optical power in a single mode
fiber causes a power density of approximately 16 million W/m2). If this
happens, measurements become inaccurate and non-repeatable.
Cleaning is, therefore, an essential yet difficult task. Unfortunately,
when comparing most published cleaning recommendations, you will
discover that they contain several inconsistencies. In this pocket
guide, we want to suggest ways to help you clean your various optical
devices, and thus significantly improve the accuracy and repeatability
of your lightwave measurements.
8
3. What do I need for proper cleaning?
Standard Cleaning Equipment
Before you can start your cleaning procedure you need
the following standard equipment:
• Dust and shutter caps
• Isopropyl alcohol
• Cotton swabs
• Soft tissues
• Pipe cleaner
• Compressed air
Dust and shutter caps
All Agilent Technologies lightwave instruments are delivered with either laser shutter caps or dust caps on the
lightwave adapter. Any cables come with covers to protect the cable ends from damage or contamination.
We suggest these protective coverings should be kept on
the equipment at all times, except when your optical device is in use. Be careful when replacing dust caps after
use. Do not press the bottom of the cap onto the fiber too
hard, as any dust in the cap can scratch or pollute your
fiber surface.
If you need further dust caps, please contact your nearest
Agilent Technologies sales office (see Appendix, page 40).
Isopropyl alcohol
This solvent is usually available from any local pharmaceutical supplier or chemist’s shop.
If you use isopropyl alcohol to clean your optical device,
do not immediately dry the surface with compressed air
(except when you are cleaning very sensitive optical devices). This is because the dust and the dirt is solved and
will leave behind filmy deposits after the alcohol is evaporated. You should therefore first remove the alcohol and
the dust with a soft tissue, and then use compressed air to
blow away any remaining filaments.
9
If possible avoid using denatured alcohol containing additives. Instead, apply alcohol used for medical purposes.
Never drink this alcohol, as it may seriously damage to
your health.
Do not use any other solvents, as some may damage plastic materials and claddings. Acetone, for example, will
dissolve the epoxy used with fiber optic connectors. To
avoid damage, only use isopropyl alcohol.
Cotton swabs
We recommend that you use swabs such as Q-tips or
other cotton swabs normally available from local distributors of medical and hygiene products (for example, a
supermarket or a chemist’s shop). You may be able to
obtain various sizes of swab. If this is the case, select the
smallest size for your smallest devices.
Ensure that you use natural cotton swabs. Foam swabs
will often leave behind filmy deposits after cleaning.
Use care when cleaning, and avoid pressing too hard onto
your optical device with the swab. Too much pressure
may scratch the surface, and could cause your device to
become misaligned. It is advisable to rub gently over the
surface using only a small circular movement.
Swabs should be used straight out of the packet, and
never used twice. This is because dust and dirt in the
atmosphere, or from a first cleaning, may collect on your
swab and scratch the surface of your optical device.
Soft tissues
These are available from most stores and distributors of
medical and hygiene products such as supermarkets or
chemists’ shops.
We recommend that you do not use normal cotton tissues, but multi-layered soft tissues made from non-recycled
10
cellulose. Cellulose tissues are very absorbent and softer.
Consequently, they will not scratch the surface of your
device over time.
Use care when cleaning, and avoid pressing on your optical device with the tissue. Pressing too hard may lead to
scratches on the surface or misalignment of your device.
Just rub gently over the surface using a small circular
movement.
Use only clean, fresh soft tissues and never apply them
twice. Any dust and dirt from the air which collects on
your tissue, or which has gathered after initial cleaning,
may scratch and pollute your optical device.
Pipe cleaner
Pipe cleaners can be purchased from tobacconists, and
come in various shapes and sizes.The most suitable one
to select for cleaning purposes has soft bristles, which
will not produces scratches.
The best way to use a pipe cleaner is to push it in and out
of the device opening (for example, when cleaning an
interface). While you are cleaning, you should slowly rotate the pipe cleaner.
Only use pipe cleaners on connector interfaces or on
feedthrough adapters. Do not use them on optical head
adapters, as the center of a pipe cleaner is hard metal
and can damage the bottom of the adapter.
Your pipe cleaner should be new when you use it. If it has
collected any dust or dirt, this can scratch or contaminate
your device.
The tip and center of the pipe cleaner are made of metal.
Avoid accidentally pressing these metal parts against the
inside of the device, as this can cause scratches.
11
Compressed air
Compressed air can be purchased from any laboratory
supplier.
It is essential that your compressed air is free of dust,
water and oil. Only use clean, dry air. If not, this can lead
to filmy deposits or scratches on the surface of your
connector. This will reduce the performance of your
transmission system.
When spraying compressed air, hold the can upright. If
the can is held at a slant, propellant could escape and
dirty your optical device. First spray into the air, as the
initial stream of compressed air could contain some condensation or propellant. Such condensation leaves behind
a filmy deposit.
Please be friendly to your environment and use a CFC-free
aerosol.
Additional Cleaning Equipment
Some Cleaning Procedures need the following equipment,
which is not required to clean each instrument:
• Microscope with a magnification range about 50X
up to 300X
• Ultrasonic bath
• Warm water and liquid soap
• Premoistened cleaning wipes
• Polymer film
• Infrared Sensor Card
Microscope with a magnification range about 50X up
to 300X
A microscope can be found in most photography stores,
or can be obtained through or specialist mail order companies. Special fiber-scopes are available from suppliers
of splicing equipment.
12
Ideally, the light source on your microscope should be
very flexible. This will allow you to examine your device
closely and from different angles.
A microscope helps you to estimate the type and degree
of dirt on your device. You can use a microscope to choose
an appropriate cleaning method, and then to examine the
results. You can also use your microscope to judge
whether your optical device (such as a connector) is
severely scratched and is, therefore, causing inaccurate
measurements.
Ultrasonic bath
Ultrasonic baths are also available from laboratory
suppliers or specialist mail order companies.
An ultrasonic bath will gently remove fat and other stubborn dirt from your optical devices. This helps increase
the life span of the optical devices.
Only use isopropyl alcohol in your ultrasonic bath, as
other solvents may cause damage.
Warm water and liquid soap
Only use water if you are sure that there is no other way
of cleaning your optical device without causing corrosion
or damage. Do not use water that is too hot or too cold, as
this may cause mechanical stress, which can damage
your optical device.
Ensure that your liquid soap has no abrasive properties or
perfume in it. You should also avoid normal washing-up
liquid, as it can cover your device in an iridescent film
after it has been air-dried.
Some lenses and mirrors also have a special coating,
which may be sensitive to mechanical stress, or to fat and
liquids. For this reason we recommend you do not touch
them.
13
If you are not sure how sensitive your device is to cleaning, please contact the manufacturer or your sales distributor.
Premoistened cleaning wipes
Use pre-moistened cleaning wipes as described in each
individual cleaning procedure. Cleaning wipes may be
used in every instance where a moistened soft tissue or
cotton swab is applied.
Polymer film
Polymer film is available from laboratory suppliers or specialist mail order companies.
Using polymer film is a gentle method of cleaning extremely sensitive devices, such as reference reflectors and
mirrors.
Infrared Sensor Card
Infrared sensor cards are available from laboratory suppliers or specialist mail order companies.
With this card you are able to control the shape of laser
light emitted. The invisible laser beam is projected onto
the sensor card, then becomes visible to the normal eye
as a round spot.
Take care never to look into the end of a fiber or any other
optical component when they are in use. This is because
the laser can seriously damage your eyes.
14
4. Preserving Connectors
Listed below are some hints on how best to keep your
connectors in the best possible condition.
Making Connections
Before you make any connection you must ensure that all
cables and connectors are clean. If they are dirty, use the
appropriate cleaning procedure.
When inserting the ferrule of a patchcord into a connector or an adapter, make sure that the fiber end does not
touch the outside of the mating connector or adapter.
Otherwise you will rub the fiber end against an unsuitable
surface, producing scratches and dirt deposits on the surface of your fiber.
Dust Caps and Shutter Caps
Be careful when replacing dust caps after use. Do not
press the bottom of the cap onto the fiber as any dust in
the cap can scratch or dirty your fiber surface.
When you have finished cleaning, put the dust cap back
on, or close the shutter cap if the equipment is not going
to be used immediately.
Always keep the caps on the equipment when it is not in
use.
All Agilent Technologies lightwave instruments and
accessories are shipped with either laser shutter caps or
dust caps. If you need additional or replacement dust
caps, contact your nearest Agilent Technologies
Sales/Service Office (see Appendix on page 40).
Immersion Oil and Other Index Matching Compounds
Wherever possible, do not use immersion oil or other
index matching compounds with your device. They are
liable to impair and dirty the surface of the device. In addi15
tion, the characteristics of your device can be changed and your
measurement results affected.
Cleaning Instrument Housings
Use a dry and very soft cotton tissue to clean the instrument housing
and the keypad. Do not open the instruments as there is a danger of
electric shock, or electrostatic discharge. Opening the instrument can
cause damage to sensitive components, and in addition your warranty
will be voided.
16
5. Which Cleaning Procedure should I use ?
Light dirt
If you just want to clean away light dirt, observe the following procedure for all devices.
• Use compressed air to blow away large particles.
• Clean the device with a dry cotton swab.
• Use compressed air to blow away any remaining filament left by the
swab.
Heavy dirt
If the above procedure is not enough to clean your instrument, follow
one of the procedures below. Please consult ”which Cleaning Procedure should I use“ in the center pages of this book.
If you are unsure of how sensitive your device is to cleaning, please
contact the manufacturer or your sales distributor.
17
5.1 How to clean connectors
Cleaning connectors is difficult, as the core diameter of a
single-mode fiber is only about 9um. This generally means
you cannot see streaks or scratches on the surface. To be
certain of the condition of the surface of your connector
and to check it after cleaning, you need a microscope.
In the case of scratches, or of dust that has been burnt
onto the surface of the connector, you may have no option
but to polish the connector. This depends on the degree of
dirtiness, or the depth of the scratches. This is a difficult
procedure and should only be performed by a skilled person, and as a last resort, as it wears out your connector.
Warning: Never look into the end of an optical cable that
is connected to an active source.
To assess the projection of the emitted light beam you can
use an infrared sensor card. Hold the card approximately
5 cm from the output of the connector. The invisible emitted light is projected onto the card and becomes visible as
a small circular spot.
Preferred Procedure
Use the following procedure on most occasions.
1. Clean the connector by rubbing a new, dry cotton swab
over the surface using a small circular movement.
2. Blow away any remaining lint with compressed air.
Procedure for Stubborn Dirt
Use this procedure when there is greasy dirt on the
connector.
1. Moisten a new cotton swab with isopropyl alcohol.
2. Clean the connector by rubbing the cotton swab over
the surface using a small circular movement.
18
Agilent 81101AC
Agilent 81102SC
Agilent 81109AC
Agilent E5574A
3. Take a new, dry soft tissue and remove the alcohol,
dissolved sediment and dust, by rubbing gently over the
surface using a small circular movement.
4. Blow away any remaining lint with compressed air.
An Alternative Procedure
A better, more gentle, but more expensive cleaning procedure is to use an ultrasonic bath with isopropyl alcohol.
1. Hold the tip of the connector in the bath for at least
three minutes.
2. Take a new, dry soft tissue and remove the alcohol,
dissolved sediment and dust, by rubbing gently over the
surface using a small circular movement.
3. Blow away any remaining lint with compressed air.
19
5.2 How to clean optical head adapters
Some adapters have an anti-reflection coating on the
back to reduce back reflection. This coating is extremely
sensitive to solvents and mechanical abrasion. Extra care
is needed when cleaning these adapters.
When using optical head adapters, periodically inspect
the optical head’s front window. Dust and metal particles
can be propelled through the adapter’s pinhole while inserting the connector ferrule to the receptacle. Those dirt
particles collect on the head’s front window, and can lead
to wrong measurement results if not removed.
Agilent 81000AA
Agilent 81000FA
Agilent 81000GA
Preferred Procedure
Use the following procedure on most occasions.
1. Clean the adapter by rubbing a new, dry cotton swab
over the surface using a small circular movement.
Agilent 81000KA
2. Blow away any remaining lint with compressed air.
Agilent 81000SA
Procedure for Stubborn Dirt
Use this procedure when there is greasy dirt on the
adapter.
Agilent 81000VA
1. Moisten a new cotton swab with isopropyl alcohol.
2. Clean the adapter by rubbing the cotton swab over the
surface using a small circular movement.
Agilent 81000WA
3. Take a new, dry soft tissue and remove the alcohol, dissolved sediment and dust, by rubbing gently over the
surface using a small circular movement.
4. Blow away any remaining lint with compressed air.
20
Which cleaning procedure should I use?
The following chart will allow you to select the appropriate cleaning
method for your optical device. Within your choosen cleaning method
you will be guided on to how to clean depending on the condition of
your device. In addition, the risk of each cleaning method is clearly
outlined, along with suggested alternatives.
Where products have similar names, a wildcard * is used. So, 81000*I
refers to 81000AI, 81000F!, 81000GI, and so on.
Agilent Product Device Name
Procedure #
81000*A
Screwed head adapters
(old version)
5.2,
5.8 (RA)
Bare fiber adapters: BA and CA
5.4
81000*B
Bare Fiber Adapters
5.3
81000*I
Connector Interfaces
5.3
5.8 (RI and UI)
81000BR
Reference Reflector
5.10
81000DF
Depolarizing Filter
5.11
81000UM
Universal through adapter
5.3
81001FF
Fixed Filter
5.11
81002FF
Integrating Sphere
5.2
81002*I
Power Meter Connector
Interfaces
5.3
81003*D
D-Shape Head Adapters
5.2
81003LA
Head Adapter
5.3
81005*A
Connector Adapters for Handhelds 5.3
81005*I
Connector Interfaces for Handhelds 5.3
21
Agilent Product
Device Name
Procedure #
81010BL
Lens
5.5
81010BS
Optical Power Splitter
5.6 or 5.8
81010PR
PDL Cable
5.1 and 5.9
81050*L
Lenses
5.5
81101*C
Adapter Cable (patchcord)
5.1
81102*C
Adapter Cable (patchcord)
5.1
81109AC
Adapter Cable (patchcord)
5.1
81113*C
Adapter Cable (patchcord)
5.1
81230FL
Attenuating Lens Adapter
5.5
81501*C
Adapter Cable (patchcord)
5.1
81520A/
21B/24A/25A
Optical Head
5.7
8153A
Lightwave Multimeter
Mainframe
5.7, 5.8, 5.9
8153*A
Power Sensor Module
5.9,
5.8 (81534A)
81542MM
LED Source Module
5.8
81551MM,
8155*SM
Laser Source Modules
5.8
8156A
Optical Attenuator
5.8
81610A/
1A/2A/3A/4A
81610CC
Return Loss Modules
5.8
Return Loss Module
Calibration Cable
5.8
22
Agilent Product
Device Name
Procedure #
8162*A
Optical Heads
5.7
81621BC
Adapter Cable (patchcord)
5.1
8163A
Lightwave Multimeter
5.7, 5.8, 5.9
81632A/3A/4A
Power Sensor Modules
5.9
81635A
Dual Power Sensor Module
5.8
8164A
Lightwave Measurement
System
5.7, 5.8, 5.9
8164*A
Tunable Laser Source
Modules
5.8
8165*A
Laser Source Modules
5.8
8166A
Lightwave Multichannel
System
5.7, 5.8, 5.9
8166*A
Laser Source Modules
5.8
8167A/B
Tunable Laser Source
5.8
8168A/B/C/D/E/F
Tunable Laser Source
5.8
8168*A
Tunable Laser Modules
5.8
8169A
Polarization Controller
5.8
E4310A (8147A)
Optical Time Domain
Reflectometer
5.8
E431*A, E432*A
OTDR Modules
5.8
E4340AZ
EDFA Assembly Kit
Refer to
description of
components
23
Agilent Product
Device Name
Procedure #
E5526A
accessFIBER Cardcage
5.8
E5527D, E5528A
accessFIBER CPU modules
5.8
E554*A, E555*A
accessFIBER modules
5.8
E5574A
Optical Loss Analyzer
5.1, 5.7
E5970A
Handheld Power Meter
5.7
E5972A
Handheld LED Source
5.8
E5974A
Handheld Laser Source
5.8
E6000B
Mini-OTDR
5.8
E600*A/B,
E601*A
Mini-OTDR Modules
5.8
E6053A/58A/60A
Rack OTDR
5.8
N3970A
Optical Power Meter
5.9
N3974A
Optical Light Source
5.8
N3977A
Optical Attenuator
5.8
References
5.1
5.2
5.3
5.4
5.5
5.6
5.7
5.8
5.9
5.10
How to clean connectors, p. 18
How to clean optical head adapters, p. 20
How to clean connector interfaces, p. 25
How to clean bare fiber adapters, p. 26
How to clean lenses, p. 27
How to clean instruments with a fixed connector interface, p. 28
How to clean instruments with an optical glass plate, p. 29
How to clean instruments with a physical contact interface, p. 30
How to clean instruments with a recessed lens interface, p. 32
How to clean optical devices which are sensitive to mechanical
stress and pressure, p. 33
5.11 How to clean metal filters or attenuator gratings, p. 34
24
5.3 How to clean connector interfaces
Caution
Be careful when using pipe cleaners, as the core and the
bristles of the pipe cleaner are hard and can damage the
interface.
Do not use pipe cleaners on optical head adapters, as the
hard core of normal pipe cleaners can damage the bottom
of an adapter.
Agilent 81000AI
Agilent 81000FI
Preferred Procedure
Use the following procedure on most occasions.
Agilent 81000GI
1. Clean the interface by pushing and pulling a new, dry
pipe cleaner into the opening. Rotate the pipe cleaner
slowly as you do this.
2. Blow away any remaining lint with compressed air.
Agilent 81000JI
Procedure for Stubborn Dirt
Use this procedure when there is greasy dirt on the interface.
Agilent 81000KI
1. Moisten a new pipe cleaner with isopropyl alcohol.
2. Clean the interface by pushing and pulling the pipe cleaner into the opening. Rotate the pipe cleaner slowly as
you do this.
Agilent 81000SI
3. Moisten a new cotton swab with isopropyl alcohol.
4. Using a new, dry pipe cleaner, remove the alcohol, any
dissolved sediment and dust.
5. Blow away any remaining lint with compressed air.
Agilent 81000VI
Agilent 81000WI
25
5.4 How to clean bare fiber adapters
Bare fiber adapters are difficult to clean. Protect from
dust unless they are in use.
Caution
Never use any kind of solvent when cleaning a bare fiber
adapter as solvents can:
• damage the foam inside some adapters;
• deposit dissolved dirt in the groove, which can then dirty
the surface of an inserted fiber.
Preferred Procedure
Use the following procedure on most occasions.
1. Blow away any dust or dirt with compressed air.
Procedure for Stubborn Dirt
Use this procedure when there is greasy dirt on the
adapter.
1. Clean the adapter by pushing and pulling a new, dry
pipe cleaner into the opening. Rotate the pipe cleaner
slowly as you do this.
Caution: Be careful when using pipe cleaners, as the core
and the bristles of the pipe cleaner are hard and can
damage the adapter.
2. Clean the adapter by rubbing a new, dry cotton swab
over the surface using a small circular movement.
3. Blow away any remaining lint with compressed air.
26
Agilent 81000BA
5.5 How to clean lenses
Some lenses have special coatings that are sensitive to
solvents, grease, liquid and mechanical abrasion. Take
extra care when cleaning lenses with these coatings.
Agilent 81010BL
Lens assemblies consisting of several lenses are not normally sealed. Therefore, use as little alcohol as possible,
as it can get between the lenses and in doing so can
change the properties of projection.
Agilent 81050BL
Preferred Procedure
Use the following procedure on most occasions.
1. Clean the lens by rubbing a new, dry cotton swab over
the surface using a small circular movement.
2. Blow away any remaining lint with compressed air.
Procedure for Stubborn Dirt
Use this procedure when there is greasy dirt on the lens.
1. Moisten a new cotton swab with isopropyl alcohol.
2. Clean the lens by rubbing the cotton swab over the surface using a small circular movement.
3. Using a new, dry cotton swab remove the alcohol, any
dissolved sediment and dust.
4. Blow away any remaining lint with compressed air.
27
5.6 How to clean instruments with a fixed connetor interface
You should only clean instruments with a fixed connector
interface when it is absolutely necessary. This is because
it is difficult to remove any used alcohol or filaments from
the input of the optical block.
It is important, therefore, to keep dust caps on the equipment at all times, except when your optical device is in
use.
If you do discover filaments or particles, the only way to
clean a fixed connector interface and the input of the optical block is to use compressed air.
If there are fluids or oil in the connector, please refer the
instrument to the skilled personnel of the Agilent service
team.
Caution
Only use clean, dry compressed air. Make sure that the
air is free of dust, water, and oil. If the air that you use is
not clean and dry, this can lead to filmy deposits or scratches on the surface of your connector interface. This will
degrade the performance of your transmission system.
Never try to open the instrument and clean the optical
block by yourself, because it is easy to scratch optical
components, and cause them to become misaligned.
28
glass filter
5.7 How to clean instruments with an optical glass
plate
Agilent 81524A
Some instruments, for example, the Agilent Technologies
optical heads have an optical glass plate to protect the
sensor. Clean this glass plate in the same way as optical
lenses (see „How to clean lenses“ on page 27).
If you are cleaning an Optical Power Head (8162*A),
please observe the following additional check. Periodically inspect the optical head’s front window for dust and
other particles. Dust and particles can be propelled
through the optical head adapter’s pinhole while inserting
a connector ferrule to the receptacle. Particles on the
optical head’s front window can signifcantly impair measurement results.
Agilent 8163
Agilent 8164
Agilent 8166
Agilent E5574A
29
5.8 How to clean instruments with a physical
contact interface
8156A
OpticalAttenuator
10.000dB
1550nm
0.000dB
1310/1550nm SM
Monitor
Input
Output
Output
Enable
Agilent 8156A
Remove any connector interfaces from the optical output
of the instrument before you begin the cleaning procedure.
Agilent 81610A
Cleaning interfaces is difficult as the core diameter of a
single-mode fiber is only about 9um. This generally means
you cannot see streaks or scratches on the surface. To be
certain of the degree of pollution on the surface of your
interface and to check whether it has been removed after
cleaning, you need a microscope.
Warning: Never look into an optical output, because this
can seriously damage your eyesight.
Agilent 8163
Agilent 81635A
Agilent 8164
To assess the projection of the emitted light beam you can
use an infrared sensor card. Hold the card approximately
5 cm from the interface. The invisible emitted light is projected onto the card and becomes visible as a small circular spot.
Agilent 81640
Preferred Procedure
Agilent 81650A
Use the following procedure on most occasions.
1. Clean the interface by rubbing a new, dry cotton swab
over the surface using a small circular movement.
Agilent 81662A
Agilent 8169
2. Blow away any remaining lint with compressed air.
Procedure for Stubborn Dirt
Use this procedure when there is greasy dirt on the interface.
1. Moisten a new cotton swab with isopropyl alcohol.
Agilent E4310
Agilent E6053A
2. Clean the interface by rubbing the cotton swab over the
surface using a small circular movement.
Agilent E6000B
Agilent 81680
30
3. Take a new, dry soft tissue and remove the alcohol, dissolved sediment and dust, by rubbing gently over the
surface using a small circular movement.
4. Blow away any remaining lint with compressed air.
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5.9 How to clean instruments with a recessed lens
interface
For instruments with a deeply recessed lens interface (for
example the Agilent Technologies 81633A and 81634A
Power Sensors) do NOT follow this procedure. Alcohol
and compressed air could damage your lens even further.
Keep your dust and shutter caps on when your instrument
is not in use. This should prevent it from getting too dirty.
If you must clean such instruments, please refer the
instrument to the skilled personnel of the Agilent service
team.
Preferred Procedure
Use the following procedure on most occasions.
1. Blow away any dust or dirt with compressed air.
If this is not sufficient, then
a) Clean the interface by rubbing a new, dry cotton swab
over the surface using a small circular movement.
b) Blow away any remaining lint with compressed air.
Procedure for Stubborn Dirt
Use this procedure when there is greasy dirt on the interface, and using the procedure for light dirt is not sufficient. Using isopropyl alcohol should be your last choice
for recessed lens interfaces because of the difficulty of
cleaning out any dirt that is washed to the edge of the
interface.
1. Moisten a new cotton swab with isopropyl alcohol.
2. Clean the interface by rubbing the cotton swab over the
surface using a small circular movement.
3. Take a new, dry soft tissue and remove the alcohol, dissolved sediment and dust, by rubbing gently over the
surface using a small circular movement.
4. Blow away any remaining lint with compressed air.
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Agilent 81532A
5.10 How to clean optical devices which are sensitive to mechanical stress and pressure
Some optical devices, such as the Agilent 81000BR Reference Reflector, which has a gold plated surface, are very
sensitive to mechanical stress or pressure. Do not use
cotton swabs, soft tissues or other mechanical cleaning
tools, as these can scratch or destroy the surface.
Preferred Procedure
Use the following procedure on most occasions.
1. Blow away any dust or dirt with compressed air.
Procedure for Stubborn Dirt
To clean devices that are extremely sensitive to mechanical stress or pressure you can also use an optical clean
polymer film. This procedure is time-consuming, but you
avoid scratching or destroying the surface.
1. Put the film on the surface and wait at least 30 minutes
to make sure that the film has had enough time to dry.
2. Remove the film and any dirt with special adhesive
tapes.
Alternative Procedure
For these types of optical devices you can often use an
ultrasonic bath with isopropyl alcohol. Only use the ultrasonic bath if you are sure that it won’t cause any damage
to any part of the device.
1. Put the device into the bath for at least three minutes.
2. Blow away any remaining liquid with compressed air.
If there are any streaks or drying stains on the surface,
repeat the cleaning procedure.
33
Agilent 81000BR
5.11 How to clean metal filters or attenuating mesh
filters
This kind of device is extremely fragile. A misalignment of
the filter leads to inaccurate measurements. Never touch
the surface of the metal filter or attenuating mesh filter.
Be very careful when using or cleaning these devices. Do
not use cotton swabs or soft tissues, as there is the danger that you cannot remove the lint and that the device
will be destroyed by becoming mechanically distorted.
Preferred Procedure
Use the following procedure on most occasions.
1. Use compressed air at a distance and with low pressure to remove any dust or lint.
Procedure for Stubborn Dirt
Do not use an ultrasonic bath as this can damage your
device.
Use this procedure when there is greasy dirt on the
device.
1. Put the optical device into a bath of isopropyl alcohol,
and wait at least 10 minutes.
2. Remove the fluid using compressed air at some
distance and with low pressure. If there are any streaks
or drying stains on the surface, repeat the whole cleaning procedure.
34
6. Additional Cleaning Information
The following cleaning procedures may be used with
other optical equipment:
• How to clean bare fiber ends
• How to clean large area lenses and mirrors
6.1 How to clean bare fiber ends
Bare fiber ends are often used for splices or, together
with other optical components, to create a parallel beam.
The end of a fiber can often be scratched. You make a
new cleave. To do this:
1. strip off the cladding.
2. take a new soft tissue and moisten it with isopropyl
alcohol.
3. carefully clean the bare fiber with this tissue.
4. make your cleave and immediately insert the fiber into
your bare fiber adapter in order to protect the surface
from dirt.
35
6.2 How to clean large area lenses and mirrors
Some mirrors, such as those from a monochromator, are
very soft and sensitive. Therefore, never touch them and
do not use cleaning tools such as compressed air or polymer film.
Some lenses have special coatings that are sensitive to
solvents, grease, liquid and mechanical abrasion. Take
extra care when cleaning lenses with these coatings.
Lens assemblies consisting of several lenses are not normally sealed. Therefore, use as little liquid as possible, as
it can get between the lenses and in doing so can change
the properties of projection.
Preferred Procedure
Use the following procedure on most occasions.
1. Blow away any dust or dirt with compressed air.
Procedure for Stubborn Dirt
Use this procedure when there is greasy dirt on the lens.
Caution
Only use water if you are sure that there is no other way
of cleaning your optical device without causing corrosion
or damage. Do not use hot water, as this may cause
mechanical stress, which can damage your optical
device.
Ensure that your liquid soap has no abrasive properties or
perfume in it. You should also avoid normal washing-up
liquid, as it can cover your device in an iridescent film
after it has been air-dried.
Some lenses and mirrors also have a special coating,
which may be sensitive to mechanical stress, or to fat and
liquids. For this reason we recommend you do not touch
them.
36
If you are not sure how sensitive your device is to cleaning, please contact the manufacturer or your sales distributor.
1. Moisten the lens or the mirror with water.
2. Put a little liquid soap on the surface and gently spread
the liquid over the whole area.
3. Wash off the emulsion with water, being careful to
remove it all, as any remaining streaks can impair measurement accuracy.
4. Take a new, dry soft tissue and remove the water, by
rubbing gently over the surface using a straight movement.
5. Blow away remaining lint with compressed air.
Alternative Procedure A
To clean lenses that are extremely sensitive to mechanical stress or pressure you can also use an optical clean
polymer film. This procedure is time-consuming, but you
avoid scratching or destroying the surface.
1. Put the film on the surface and wait at least 30 minutes
to make sure that the film has had enough time to dry.
2. Remove the film and any dirt with special adhesive
tapes.
Alternative Procedure B
If your lens is sensitive to water then
1. Moisten the lens or the mirror with isopropyl alcohol.
2. Take a new, dry soft tissue and remove the alcohol, dissolved sediment and dust, by rubbing gently over the
surface using a small circular movement.
3. Blow away remaining lint with compressed air.
37
6.3 Other Cleaning Hints
Selecting the correct cleaning method is an important element in maintaining your equipment and saving you time
and money. This Pocket Guide highlights the main cleaning methods, but cannot address every individual circumstance.
This section contain some additional hints which we hope
will help you further. For further information, please
contact your local Agilent Technologies representative
(see Appendix on page 40).
Making the connection
Before you make any connection you must ensure that all
lightwave cables and connectors are clean. If not, then
use appropriate cleaning methods.
When you insert the ferrule of a patchcord into a connector or an adapter, ensure that the fiber end does not touch
the outside of the mating connector or adapter. Otherwise, the fiber end will rub up against something which
could scratch it and leave deposits.
Lens cleaning papers
Some special lens cleaning papers are not suitable for
cleaning optical devices like connectors, interfaces, lenses, mirrors and so on. To be absolutely certain that a
cleaning paper is applicable, please ask the salesperson
or the manufacturer.
Immersion oil and other index matching compounds
Do not use immersion oil or other index matching compounds with optical sensors equipped with recessed lenses.
They are liable to dirty the detector and impair its performance. They may also alter the property of depiction of
your optical device, thus rendering your measurements
inaccurate.
38
Cleaning the housing and the mainframe
When cleaning either the mainframe or the housing of
your instrument, only use a dry and very soft cotton tissue
on the surfaces and the numeric pad.
Never open the instruments as they can be damaged.
Opening the instruments puts you in danger of receiving
an electrical shock from your device, and renders your
warranty void.
39
Appendix
Agilent Service and Support
Any adjustment, maintenance, or repair of this product
must be performed by qualified personnel. Contact your
customer engineer through your local Agilent Technologies Service Center. You can find a list of local service
representatives on the Web at:
http://www.agilent.com/find/assist
Or contact the test and measurement experts at Agilent
Technologies. (During normal business hours)
United States
(tel) 1 800 452 4844
Canada
(tel) 1 877 994 4414
(fax) (905) 206 4120
Europe
(tel) (31 20) 547 2323
(fax) (31 20) 547 2390
Japan
(tel) (81) 426 56 7832
(fax) (81) 426 56 7840
Latin America
(tel) (305) 269 7500
(fax) (305) 269 7599
Australia
(tel) 1 800 629 485
(fax) (61 3) 9272 0749
New Zealand
(tel) 0 800 738 378
(fax) 64 4 495 8950
Asia-Pacific
(tel) (852) 3197 7777
(fax) (852) 2506 9284
40
Your Notes
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Copyright © 2000
Agilent Technologies
Printed in Germany 10/00
Agilent Technologies 5963-3538F, October 2000