Qualis Audio Sentine, User Manual, Page: 82 / 108

76 User Manual
The Sentinel logs internally up to 25 hours of readings data. The data
includes all audio characteristics sampled by the Sentinel and all mea-
surements. To save space, logged data is saved at approximately 1.4
second intervals (a 4-to-1 merging of the original readings data).
To access and preserve this data, you need to download it from the
Sentinel to a storage repository. Once data is in the repository, you
can review and display it in the same way as live readings through the
Readings Timeline panel (p. 40). The downloaded data is available
indefinitely, limited only by storage limits and your archive policies.
You can download the logged data through the Sentinel’s web interface
for longer term storage. You can also perform this downloading as a
separate command, independent of the web interface.
Repository organization
The repository is organized as a sequence of daily log files, stored in
a single directory. The directory can be located on any file system to
which you have access – local, or on a shared server.
Each daily log files starts at 00:00:00 UTC (midnight, UTC time), and is
associated with a particular Sentinel. This information is coded in the
name of the file:
XXXXXX - yyyymmdd 0000.qa1
Where XXXXXX is the Sentinel serial number, yyyy is year, mm is month
(01-12), and dd is day of month (01-31). For example, the log file for
Sentinel 20C148 for June 21, 2010, would be:
20C148-201006210000.qa1
Repository access
Log data downloading and log repository access are managed by a
Java applet loaded from the Sentinel. For this to work correctly, you
should have Java 1.5.0 or later installed on your system, and you need
to have Java applets enabled in your browser.