Vaisala PWD22 - Other Commands; Date; Time

USER'S GUIDE ____________________________________________________________________
78 __________________________________________________________________ M210543EN-F
ZERO SIGNAL: FAIL
ZERO SIGNAL: NOISE HIGH
CHEC
Use the CHEC command when calibrating visibility to display the one-
minute average signal frequency in hertz (Hz). This command has no
parameters.
Press ESC to terminate the display. If you press any other key, the
display pauses. In the beginning, the four-location buffer, which is used
to calculate the average, is filled with the first value.
When the calibrator is installed, the value displayed in the message
should be the same as the value printed on the calibrator glass plate.
Give the following command:
>CHEC
The output is the following:
SCALED FREQUENCY AVE (1 MIN)
499.9938
499.9880
DRY ON and WET
Use the DRY ON and WET commands to check and adjust the operation
of the Vaisala RAINCAP
®
Rain Sensor measurement.
DRY ON
Use the DRY ON command to set the reference level of the dry signal
for the RAINCAP
®
signal normalization calculation. When giving the
DRY ON command, the sensor surface and weather conditions must be
dry.
The output is the following:
DRD DRY OFFSET 715.6
The DRY OFFSET value must be between 700 and 900, when the
RAINCAP
®
hardware operates normally. The DRY command without a
parameter just shows this parameter.
WET
The WET command without a parameter shows the scaling factor that
normalizes the RAINCAP
®
signal change from the dry state to the wet
state to be 1.00. A typical value is close to 0.0015.