User`s guide

Chapter 3 ________________________________________________________________ Operation
VAISALA______________________________________________________________________ 105
setup is created. The approximate maximum logging period for a setup
where 10 measured values are logged is shown in Table 15 on page 105.
Log files are automatically deleted after a given period so that there is
always a certain amount of logged data saved in the Flash memory. The
period is adjustable in a setup and can vary from 0 (= at midnight, the
previous day's file will be deleted to free up memory) to never delete
(=log memory will be filled up completely). To ensure some data
backup, for example, a value of 4 days is feasible. If the delete interval
is set negative with the MAWS Lizard Setup Software, the old log files
will not be deleted automatically.
Log Data Format
A log entry is generated at the time defined in the setup file. When
entries are retrieved with the logshow command, the produced output
includes two parts: the header and the log entry information.
In Figure 89 on page 106, the example of a log query shows 10 entries
of logged items 1 and 2 starting at 6 o'clock on December 9, 2003.
Table 15 Log Memory Capacity
Logging Interval Maximum Logging Period
1 second 5 hours
10 seconds over 2 days
1 minute 2 weeks
10 minutes over 4 months
1 hour Almost 2 years