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OCC-CWDM-301-18
5. Maintenance and Calibration
5.1 Maintenance and Replacing of Batteries
Battery for this instrument is rechargeable NiMH battery.
Note
Notes for maintenance of batteries in the instrument:
•
In order for the OTDR (including the batteries) to meet specifications, the storage temperature should be
within 15
℃
to 30
℃
. And the instruments should be stored in low humidity environments
•
If the instrument is left unused for a long time (idle for over 2 months), it is recommended to recharge the
battery every other month
•
Procedure of replacing battery is as follows.
o
Take off cover of the battery chamber
o
Remove the battery and draw out socket from the jack of chargeable battery, then change the
battery if necessary
o
Remove the RTC clock battery, then change it if necessary
5.2 Cleaning of Interfaces
Interfaces must be kept clean. Special alcohol may be used to clean optic output. Always replace protective dust
caps when the unit is not being used, and keep the protective dust caps clean.
In addition, flanges must be kept clean periodically,
Effects of Cleaning Interfaces and Connectors
The diameter of optic core is 9um, and diameter of dust and other particulates ranges from 1/100 to 1/1/10 um.
Comparatively speaking, the size of dust and other particulates can cover part of optic end and therefore degrade
the performance of the instrument.
In addition, power density may burn dust into optic fiber and induce further damage (for example, 0dBm optic
power may produce about16000000W/m*m power density in single mode fiber). In this case, measurement will
be inaccurate and irreversible.
Safety instructions to be followed before cleaning
•
Make sure the instrument is power off when cleaning
•
Any operations contradict to the instructions may result in dangerous laser injuries
•
Make sure laser source is off, when clean any optic connectors
•
When the instrument is in operation, please always avoid looking directly into optic output. Although
laser radiation is invisible, it may do serious injury to eyesight
•
Be cautious of electric shock and make sure AC power is disconnected with the instrument before
cleaning. Always use dry or moistest soft cloth to clean the outside of the instrument, and never clean the
inside
•
Please do not add any accessory to optic instrument or adjust the instrument at discretion