Ceilometer CT25K
User’s Guide CT25K-U059en-2.1
114
NOTE
If you run into trouble performing step 8 above, such that
the adjustment is not finished because screw B has already
traveled all the way out from the receiver, you also have to
adjust the other end of the fiber. (This can be quite
laborious.) In this case follow these next steps:
10. Turn the B-screw back clockwise until it is several turns inside the
threads. (Approximately in the original position).
11. Perform steps 1-3 of paragraph 8.4.3. Compensation adjustments again.
During step 3, however, loosen slightly the M3 slotted head screw and
make very small adjustments to the position of this fiber end. The purpose
of these adjustments is to increase the level of optical power that is
coupled into the fiber. This effect is seen in the terminal display so that
the amount of stars increases, the "empty hole" is filled and finally a case
at the bottom left (or upper middle) in Figure 8-4 is reached. When this is
achieved, tighten the M3 slotted screw well again and make the fine
adjustment with the B-screw. Secure the M3 screw with red paint.
Continue to finish the replacement operation as in steps 8 and 9 above.
NOTE
The adjustments at the Center Block end must be very
small (0.2 mm or so) and you have to wait a couple of
seconds before the effect is seen on the terminal.
8.7 Optics Monitor CTL21
8.7.1 Removal
When there is reason to suspect malfunction of the Optics Monitor do as
follows: (Note Paragraph 8.3 Start-up procedure.)
1. Detach the ribbon cable connector from the Optics Monitor CTL21.
2. Mark (with pencil) the position of the CTL21 in order to replace it
correctly.
3. Loosen the two screws (Figure 8-6) with a screwdriver. (The optics
monitor ribbon cable remains attached to the Optical Subassembly).
4. Send the defective Optics Monitor to Vaisala.
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