Vaisala FD12P, User Manual

Page: 131 / 154

Chapter 6 _______________________________________________________________Maintenance
VAISALA _______________________________________________________________________ 131
Table 24 Parameters for Optical Measurement
Parameter Type of Parameter Command to Change
the Parameter
Transfer function
scaling factor Calibration constant CAL (FCAL)
Offset reference value Internal monitoring CONF
Transmitter
backscatter reference
value Internal monitoring CLEAN
Receiver backscatter
reference value Internal monitoring CLEAN
Table 25 Parameters for DRD12 Precipitation Detector
Parameter Type of Parameter Command to Change
the Parameter
Dry state offset value Calibration constant DRY
Output scaling factor Calibration constant WET
Table 26 Parameters for DTS14 Temperature Sensor
Parameter Type of Parameter Command to Change
the Parameter
Offset value Calibration constant TCAL TS
(Scaling factor Calibration constant TCAL TS)
If any electronics units are replaced, some (or all) of the parameters
may need to be updated. Table 27 below describes the necessary
operations for each unit.
Table 27 Updating Parameters
Unit Necessary Operations Commands
FDT12B Transmitter
Unit Update optical calibration,
offset reference value and
backscatter reference. CAL (FCAL)
CONF
CLEAN
FDR12 Receiver Unit Update optical calibration,
offset reference value and
backscatter reference. CAL (FCAL)
CONF
CLEAN
DRD12 Precipitation
Detector Update dry offset value
(and scaling coefficient.)
Note! Scaling coefficient
can be left unchanged
without practically any
harmful effects. DRY
(WET)
DTS14 Temperature
Sensor Update offset value. TCAL TS
DRI21 Sensor
Interface Update temperature offset. TCAL TS
FDP12 Processor
Board All of the above (including
WET).