Chapter 6 ________________________________________________ Maintenance
VAISALA__________________________________________________________37
NOTE
There must not be any objects in front of the sensor when
the CALIBRATE WINDOW_CLEAN
VISIBILITY_SENSOR command or the CALIBRATE
WINDOW_CLEAN command is given.
NOTE
The window must be dry before giving the CALIBRATE
WINDOW_CLEAN BL_SENSOR command.
Calibration Check and Calibration
Procedure
LM21 Background Luminance Sensor can be field
calibrated by using the LMA21 field calibration unit.
Calibration is performed by using a stabilized white LED.
The LED has been stabilized by a feedback loop. The light
beam is diffused through the opal glass window of the
calibrator. The calibrator also includes a non-volatile
memory which stores the calibration coefficients of the light
intensity. These coefficients have been stored during factory
calibration.
To Next Page
Loading...
