Vaisala PWD22 - Internal Monitoring; Built-In Tests; Figure 6 LED Indicators on the PWC22;52 Board

USER'S GUIDE ____________________________________________________________________
26 __________________________________________________________________ M210543EN-F
BLCAL Command
PWD22/52 calculates the new BL scale if the current background
luminance in cd/m
2
is known. The PWL111 sensor must be activated by
the BLSC command and the BLSC must be 1.0. where 12300 is the
current background luminance in cd/m
2
. Do not enter this command
repeatedly with less than one minute intervals. Use the command only in
stable weather with clear skies.
PWD22/52 calculates the BL scale in response to the following
command:
>BLCAL 12300
0310-001
Figure 5 PWL111 Block Diagram