NOYAFA NF-902 - Manual (Page 8)

4．Maintenance
As a high sensitive electric ＆ optical instrument, this optical power
meter must be maintained carefully so as to acquire high precision
and flexibility, thus, please pay close attention to the following
items :
◆Before use, clean the optical fiber connector all the time
◆Away from dust
◆Only a dry and clean place is allowable to store this instrument
and keep away from direct sunshine.
◆Over temperature or large temperature variation shall be avoided.
◆Away from unnecessary impact or vibration.
◆If any liquid splashed onto the surface or the inner of instrument,
cut off the power supply and restart it till dried completely.
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 aviod crack of probe. Otherwise, the accuracy
of measurement value will be reduced, even failed to carry out
any measurement.
ATTENTION: when the optical power meter is not operated,
cover the dust-cap to keep the optical power meter clean.
Your excellent helper in cable test! 6