Ammonit Data Logger Manual
26
Ammonit GmbH / 2005 - 2009
Generally, the user will want to think and work in "round" intervals. To support
this, the scan interval is always synchronised to the full minute. Thus, after a
RESET command, the user must wait until the clock reaches the next full minute
before the just programmed measurement operation starts.
Every midnight the log interval is synchronised to the full hour - even if this
results in an incomplete log interval just before 24:00 hrs.
3.2. Wind statistics
Input quantities such as wind speed and wind direction have an extremely
dynamic nature. Characteristically they change both within short periods
("gusts") as well as in long-term periods (such as in seasonal rhythms.
Thus, during the last few years, in certain areas of application such as wind
energy utilization, a number of standard procedures have been developed for
characterizing local wind regimes with just a few statistical values and tables.
You can directly apply some of these methods for your pre-evaluations. A
particular area of the memory is reserved for statistical data. When the blocks
reserved for statistics are full, the system overwrites the respective oldest block
with the next new statistic.
Statistics parameters
Memory reserves:
4
Statistics
Averaging time:
1
Minutes
Store statistic after:
1
Monthly (calender
month)
Each statistic of Data Logger provides:
•
Mean and maximum value of wind speed
•
Frequency distribution of wind speed
•
Frequency distribution of wind direction
The wind speed that is recorded by a second anemometer at a different
measurement level calculates as well mean and maximum wind speed and
frequency distribution.
Synchronisation
Log interval
Summary of Contents for METEO-32
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