Keysight Technologies N77 Series User Manual page 89

Maintenance and Troubleshooting 5
Warm water and liquid soap
Only use water if you are sure that there is no other way of cleaning
your optical device without 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.
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.
Keysight N77xx Series 89