HP 8168E User Manual page 238

Cleaning Recessed Lens Interfaces
1. Blow away any dust or dirt with compressed air.
Preferred
Procedure
If this is not sucient, then
1. Clean the interface 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 Use this procedure particularly when there is greasy dirt on the interface, and
Stubborn Dirt using the procedure for light dirt is not sucient. Using isopropyl alcohol
should be your last choice for recessed lens interfaces because of the diculty
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.
Cleaning Fragile Optical Devices
Some optical devices, such as the HP 81000BR Reference Re ector, 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.
1. Blow away any dust or dirt with compressed air.
Preferred
Procedure
To clean devices that are extremely sensitive to mechanical stress or pressure
Procedure for
you can also use an optical clean polymer lm. This procedure is
Stubborn Dirt
time-consuming, but you avoid scratching or destroying the surface.
1. Put the lm on the surface and wait at least 30 minutes to make sure that
the lm has had enough time to dry.
2. Remove the lm and any dirt with special adhesive tapes.
For these types of optical devices you can often use an ultrasonic bath with
Alternative
isopropyl alcohol. Only use the ultrasonic bath if you are sure that it won't
Procedure
cause any damage to 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.
E-12 Cleaning Procedures