Vaisala LT31 - Alignment Procedures

Chapter 6 ______________________________________________________________ Maintenance
VAISALA ______________________________________________________________________ 225
Alignment
Any mechanical change to the LT31 system demands an alignment. The
mechanical changes can be the following:
- Initial set-up of the LT31 system.
- Full replacement of the transmitter or receiver measurement unit.
- Replacement of any PCB of the transmitter or receiver measurement
unit
- Indication of Reduced Alignment Quality in the overall status (see
section Status Codes on page 164).
Depending on the mechanical impact, a raw and fine alignment or a fine
alignment only must be carried out.
The alignment procedure is heavily supported by the Alignment menu.
To enter the Alignment menu, it is necessary to open the maintenance
terminal (see section Entering and Exiting Command Mode on page 134)
and enter the menu-driven operation (see section Menu-driven Operation
on page 156).
0401-112
Figure 128 Alignment Menu
As Figure 128 above shows, the Alignment menu consist of three areas:
- On the left, the available actions are displayed. During the alignment
process the progress is indicated.
- On the right, necessary information is given for the transmitter and
receiver measurement unit.
The overall Status and the Axes Position Data of the transmitter and
receiver measurement unit are displayed.
For the receiver measurement unit, the Synchronization Signal status
and the Main Receiver Signal Strength are displayed additionally.
The Synchronization Signal Status indicates the quality of the