Vaisala WS425FG - Manual (Page 53)

Chapter 4 ________________________________________________________________ Operation
VAISALA_______________________________________________________________________ 51
1. The wind speed in this WA message must be equal or smaller than
1.0 knots.
2. The SQI value for each measurement path must be equal or higher
than 90. The average from the individual SQI values must be equal
or higher than 95.
Other parameter test limits are the same as with the WS command.
In typical operation, the WATE command is executed incorporation
with WA command via the WATE test of the Diagnostics Program as
explained in section
Preventive Maintenance on page 67 .
WCAL Command
This is the sensor self calibration command. The command format is:
WCAL CR LF
This command is to be used in conjunction with the zero wind speed
verifier and in addition, the provided bag if the operation is done
outdoors. It is extremely important that it will only be performed while
the verifier is installed on the sensor. Should it ever be performed
accidentally without the verifier, be sure to redo this command with the
verifier installed prior to the deployment. One of the command
functions is to determine the sensor zero offset and save parameters to
remove it. If the sensor is calibrated in the presence of ambient wind or
even air conditioning flow in the office environment, an invalid zero
offset compensation will result. The verifier by itself is able to keep
indoor air conditioning from affecting the calibration, but not outdoor
airflow. If the sensor is to be calibrated outdoors, you must cover the
verifier completely with the provided bag with drawstrings snug after
placing the verifier over the sensor. This command also performs
measurements that will improve sensor accuracy.
The sensor will stop the current measurement activity when it receives
this command, and will prompt for password. If the password is entered
correctly, the sensor will respond with the following:
CAUTION – Anemometer calibration MUST ONLY be performed
with Vaisala Verifier and bag in place on the anemometer.
Do you wish to proceed? (Y/N)
At this time, the operation may be aborted by responding with N. Do not
respond with Y unless the verifier and bag are already in place. If the
response is Y, the sensor will respond with the following: