102 Keysight N774-C & 8162-C Series User’s Guide
6 Maintenance
Cleaning Instructions
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.
Keysight Technologies assume no liability for the customer’s failure to
comply with these requirements.
Safety Precautions
Please follow the following safety rules:
• Do not remove instrument covers when operating.
• Ensure that the instrument is switched off throughout the cleaning
procedures.
• 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.
• After cleaning, do not switch on the instrument when there is no
termination to the optical output connector, to the optical fiber or to
the attached device. The laser radiation is not visible to the human eye,
but it can seriously damage your eyesight.
Why is it important to clean optical devices?
In transmission links optical fiber cores are about 9 mm (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 as a result 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/m
2
). If this
happens, measurements become inaccurate and non-repeatable.
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