Vaisala LT31, Руководство пользователя

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User's Guide ______________________________________________________________________
210 _________________________________________________________________ M210667EN-C
1104-109
Figure 121 Transmitter Measurement Unit Opened
3. Disconnect the three plugs at the rear end of the LTC112 board.
4. Check if it is necessary to clean the measurement unit windows
from the inside. Wipe the window panes with a soft, lint-free cloth
and normal glass cleaner or isopropyl alcohol. Be careful not to
scratch the window surfaces.
5. After replacing the optics unit, pay attention to the correct position.
The optics unit should be mounted in parallel to the enclosure.
6. Reconnect the three plugs at the rear end of the LTC112 board.
7. Tighten the two fastening screws and the bolt carefully.
8. The complete optics unit consists of fully adjusted and tested
modules. For that reason, no adjustments are necessary.
9. Finally close the measurement unit carefully. Pay attention to the
position of the cover seal.
10. The repaired measurement unit must be mounted in the same way
as described in section Mounting Receiver Measurement Unit on
page 124.
11. Make sure that the enclosure is in parallel with the support unit.
12. Secure the fastening screws of the measurement unit carefully.
13. Turn on the AC power switch (and also the battery backup switch,
if installed).
CAUTION After repairing the measurement unit, fine alignment and calibration
must be carried out to establish normal operational conditions. For
details, see sections Fine Alignment on page 231 and Calibration on
page 232.