User's Guide ______________________________________________________________________  
238 _________________________________________________________________ M210667EN-C 
The taken Main Receiver Signal has to be linked to a MOR reading (see 
Figure 136 below). 
 
  0401-140 
Figure 136  Choosing MOR Reading 
Type A for applying the PWD sensor visibility or type B to give an 
observer estimation for MOR. When using PWD sensor visibility has 
been selected no extra input is needed. If the user wants to give an 
observer estimation, the system will prompt for an extra input: 
Give Observer’s Visibility Estimation In Meter: 
Type the value and terminate the input by pressing <CR>. 
The new calibration data is displayed on the right side. The new value 
have to be accepted by the user. 
Accept Calibration? (yes/no): 
To accept the new values, type yes<CR>. 
To discard the new values, type no<CR>. 
An indication about the storage of the data is given. When the calibration 
is completed, Done! is displayed in the lower part of the menu. 
Visibility Calibration 
To start the visibility calibration, press B in the Calibration menu. 
NOTE 
For a proper visibility calibration, all the optical surfaces of the 
transmitter/receiver measurement unit and PWD sensor must be clean. 
 
Clean Windows! Done? (yes/no):