HP 8163A User Manual page 194

WA RN IN G
Cleaning Procedures
In general, whenever possible use physically contacting connectors,
and dry connections. Fiber connectors may be used dry or wet. Dry
means without index matching compound. Clean the connectors,
interfaces and bushings carefully each time after use.
Make sure to disable all sources when you are cleaning any optical
interfaces.
Under no circumstances look into the end of an optical cable attached
to the optical output when the device is operational.
The laser radiation is not visible to the human eye, but it can seriously
damage your eyesight.
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