NOYAFA NF-906A - Manual (Page 12)

4．Maintenance
◆Always clean the optical connector each time a connector is
attached.
◆Avoid exposing the unit to temperature extrames. Condensation
can form inside the unit and affect proper operation.
◆Ensure the dust cap is in place any time a connector is not
attached.
◆Store the unit in clean and dry place.
4.1 Probe cleanness
Clean the probe of optical power meter regularly.
1.Open the dustproof cap
2.Screw off the adapter of power meter
3.Use 2.5mm special cotton swab with some anhydrous alcohol
to clean the surface of probe slightly.
WARNING: when clean the probe of optical power meter, it is
forbidden to use any hard thing to touch the surface of probe
in case cause damage to probe; in addition, keep away from a
strong force to avoid crack of probe. Otherwise, the accuracy
of measurement value will be reduced, even it fails to carry
out any measurement.
ATTENTION: when the optical power meter is under idle mode,
cover the dust-cap to keep the optical power meter clean.
Your excellent helper in cable test! 10