Ceilometer CT25K
User’s Guide CT25K-U059en-2.1
106
Figure 8-3 Adjusting the compensation
Adjusting should not require more than a couple of turns. The screw should
not move too easily after the adjustment has been completed. If a locking nut
is in place, tighten it.
In case the graph does not get optimized the following faults are possible:
– The window or the lens of the ceilometer is extremely dirty
– The Optical termination hood required during the indoor adjustment
is dirty or missing
Other possible faults are the following:
– Compensation Fiber itself is defective
– Receiver is damaged
– Beamsplitter at the lower end of the Optical Subassembly is broken
etc.
In the latter case consult Vaisala.
4. Press the Esc key one or two times to stop the compensation monitoring.
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