Vaisala MAWS201 User's Guide Page 142

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User's Guide _______________________________________________________________________
140 __________________________________________________________________ M210243en-A
Calibration
The MAWS software provides means for one-point field calibration of
PMT16A. Required equipment:
- Laptop PC with a terminal software
- A standard barometer (for example Vaisala PTB220TS)
- Terminal cable QMZ101 (delivered with MAWS).
Table 27 Calibration Procedure
Step Action Command/note
1. Establish terminal connection to MAWS by
connecting the terminal cable between
COM0 port of MAWS and a COM port on
your PC.
For more information, refer to section
Establishing Terminal Connection on page
104.
2. Place both pressure sensors at the same
level.
NOTE! Make sure that the wind does not
interfere with the reading of the reference
barometer.
3. Read the reference barometer reading.
4. Give this reference reading, for example
1003.7 hPa, to MAWS.
Type:
PMT16CAL 1003.7
5. Check the readings given by MAWS. Value = (reference reading)
Measured value = measured by MAWS
Offset = measured value - reference reading
6. Repeat the calibration if necessary.
7. Close the terminal connection.
Give command close
Precipitation Sensors
QMR101
To ensure reliable and accurate measurements, we recommend that the
following checks be carried out at each visit to the rain gauge.
NOTE
If the gauge is still connected to the data logger and logger is
operating, care must be taken to avoid tipping the spoon/bucket when
carrying out the following operations.
1. Inspect the funnel for any damage or blockage. At certain times
of year, leaves may have accumulated into the funnel. Dirt and
dust can also block the grille preventing or reducing the flow
rate to a slow drip to the buckets beneath. Remove all obstacles
from the funnel.
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