Agilent Technologies 86038B User Manual page 319

How to clean instruments with a recessed lens interface
Agilent 86038B Photonic Dispersion and Loss Analyzer, Second Edition
For instruments with a deeply recessed lens interface (for
example the Agilent 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 Agilent's 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 preferred procedure 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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