Chapter 5 _________________________________________________________ Theory of Operation 
 
VAISALA _______________________________________________________________________ 115 
 DC saturation:    0 offset:     -0.09 
Transmitter: 
 Window cont:      0 backscatter:    8 
 Intensity:      162 
Contamination compensation:  ON 
Temperatures (unit C): 
 surface: 22.8 CPU: 27.8 RX: 27.3 TX: 29.3 hood RX: 20.3 
 Hood TX: 21.0 
Voltages: 
 +12V: 11.4 -12V:-11.3 VB: 12.5 VR:  6.7 
Heater status: 
 Hood TX:  OFF, hood RX:  OFF, dew:  OFF 
 
Interface unit: OK 
Temperatures (unit C): 
 CPU:  27.1, external: ///// 
Humidity: //// 
Voltages: 
 +12V:   12.1 +12Vout:    0.0 PVin:   23.8 V5I: OFF 
 
Background luminance sensor: OK 
 Window cont:     10 
 Contamination compensation: ON 
 Backscatter:      0 
 CPU: 26.2 hood: 24.6 
 Heater status: hood:  OFF, dew:  OFF 
 V5iso:  ON 
 
# 
 
Reduction in window transmittance, in % 
Signal level from total blockage signal, in % 
Receiver DC signal level of total saturation, 
in % 
Scatter signal offset (raw AD conversion, unit 
is LSB) 
Reduction in window transmittance, in % 
Signal level from total blockage signal, in % 
Contamination 
compensation 
Status of visibility compensation 
FSM102 external temperature 
Receiver hood temperature