Data registration
Ammonit GmbH / 2005 - 2009
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3.
Data registration
The entire memory available on the data logger is subdivided into:
•
measurement series memory
•
Wind statistics memory
•
Slow Motin Recorder (SMR)
The data of measurement series and wind statistics are subdivided into blocks.
In the measurement series memory, one block of data encompasses the
measurements for one day; in the statistics memory, one block encompasses
one statistic. Both individual memories are organized as shift registers. When
there is no space left in a memory, the system overwrites the respective oldest
stored block. This protects the user against data loss, because even that data
which has already been read out remains "logged" in the shift register memory
until memory space is required for newer data. Because the various data sets
overlap chronologically, data from several read-outs can be joined continuously.
3.1. Measurement series
3.1.1. Scan intervals
Initially, each sensor sends an electrical signal to the output which represents
the measured quantity as a function of time. Within the data logger, these
signals are converted to numerial values in certain regular intervals controlled by
an internal real-time clock. These values form the basis for all further
evaluations and are henceforth referred to as "scan values". The time interval
between each scan can be selected as the so-called
scan interval, in the range 1 ... 60 seconds
3.1.2. Log interval
Of course, you can also imeediately store each measured value. However, in
typical long-term measurements, several scan values are collected together
before they are stored. The time within such a routine is carried out is referred to
as the log interval. You determine the length of this interval by specifying a fixed
number of scan values: 1 ... 9999
i.e. a whole numbered multiple of scan interval. Many short scan intervals or a
few long ones can lead to log intervals of the same length. In many applications
your settings are specified to be in accordance to a standard. In other cases it is
best to choose scan intervals of at least 10 seconds.
Shorter intervals may be necessary for turbulence measurements.
Please note also, that power consumption increases at shorter scan intervals.
Summary of Contents for METEO-32
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