Chapter 6 ______________________________________________________________ Maintenance
VAISALA ______________________________________________________________________ 235
To make sure that the operation is stable, the LT31 system should be
powered up for at least 20 minutes. The user has to give a confirmation.
System Powered For At Least 20 Min? (yes/no):
To confirm, type yes<CR>.
To abort the action, type no<CR>.
For offset calibration, the optical path has to be blocked. This will have
to be done at the receiver location. The user has to confirm the blockage.
0401-137
Figure 133 Optical Blocker Mounted on Receiver Support Unit
Block Receiver! Done? (yes/no):
To confirm, type yes<CR>.
To abort the action, type no<CR>.
Now the Main Receiver Signal is evaluated and taken as an offset value.
An indication of progress is given on the left of the menu (see Figure 134
on page 236).
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