Vaisala LT31 - Figure 134 Offset Calibration

User's Guide ______________________________________________________________________
236 _________________________________________________________________ M210667EN-C
0401-138
Figure 134 Offset Calibration
When the offset signal has been taken, the optical path has to be
unblocked. The user has to confirm the clearance of the optical path.
Unblock Receiver! Done? (yes/no):
To confirm, type yes<CR>.
To abort the action, type no<CR>.
NOTE
For a proper visibility calibration, all the optical surfaces of the
transmitter/receiver measurement unit and PWD sensor have to be clean.
Clean Windows! 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 signal for a
visibility value. An indication of process is given on the left of the menu
(see Figure 135 on page 237).