Vaisala Hydromet Data Collection Platform - Manual (Page 103)

Chapter 4 ____________________________________________ Basic Use of Lizard Setup Software
VAISALA______________________________________________________________________ 101
Using External Memory Cards
The size of the external memory cards, or, Compact Flash cards,
supported by the QML logger ranges from 32 MB to 2 GB. Vaisala
offers 32 and 256 MB cards as a standard option. It is recommended that
you use only cards purchased from Vaisala that have been tested to
function in harsh environments.
The external log memory acts as a storage for data that has been copied
or moved from the internal memory. The copying or moving is carried
out once a day, 30 seconds after midnight. Once the data has been
moved from the internal memory to the external memory card, no log
group reports can be sent from this data.
Automatic Erase for Compact Flash Card
The log group -specific setting Number of days to preserve log files
also affects the files stored to the external Compact Flash card. The
functionality is the same as for internal log memory, that is,
- Files older than the selected value [days] are deleted automatically
- Files are not erased, that is, the automatic clean-up is disabled
When files are stored to the external card, the internal memory is used
as the working memory for storing the log files of the current day. These
working files are moved to the external card each day just after midnight
when the new files have been opened for writing.
NOTE If the Compact Flash memory card has not been formatted, it must be
formatted before use.
In MAWS versions 6.00 and later, it is recommended that you format
the card in a Windows PC. The file system to use is FAT (not FAT32).
Also, do not select the quick format option.
To format the CF card in the QML logger, insert it into the CF slot of
the QML logger. Give the EXTFS ERASE command. After the card
has been formatted, you can remove it from the slot.