Data Storage - mru SWG100 BIOEX User Manual

20.5.

Data Storage

The analyser makes use of an internal flash memory to store measurement values
automatically.
Data storage strategy is as follows:
The analyser may store up to 20,000 measurement points (including all relevant data).
•
At the end of each measurement cycle (per sampling point) the current values will be
•
stored.
The memory is used as a ring buffer. As soon as the memory is completely occupied,
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the latest measurements will replace the oldest measurements.
Specifically:
If the used memory is 99%, then the oldest 20% of the measurements will automatically be
exported to SD card in CSV format and then deleted from the memory. In case the SD card
export doesn't succeed (SD Card missing or read-only), then only the oldest 4% of the
measurements will be deleted. The file names reflect the date of the most recent measurement
contained in the export file, e.g. "20141031.csv".
Example:
An analyser with 2 sample points and a total configured cycle time of 32 minutes saves 2 * 24 *
60/32 = 90 measurements per day (45 of each sample point). So the ring buffer will provide
measurements of the last 20000/90 = 222 days (more than 7 months).
Data Storage Menu
The data storage menu can be reached by pressing F2='storage' in the measurement menu:
The menu provides an overview of stored measurements of each sample point and of the
memory usage.
View stored measurements in text mode
This function can be reached from the Data Storage Menu by selecting one or all sample points
and by pressing F1='view text':
When entering the menu the latest stored measurement will be displayed. With the keys
F1='previous' and F3='next' the measurements can be browsed (F3 will lead to the oldest
measurement when the latest was displayed before - wrap-around).
You may delete a single measurement here, usually you won't need this function. The arrow
keys have the same function than in the measurement menu.
View stored measurements in graphic mode
This function can be reached from the Data Storage Menu by selecting one
sample point (not all) and by pressing F3='view graph':
Two curves for one pair of data are shown at the same time in one diagram.
The used scales are determined automatically and can't be changed by the
user.
The offered pairs of data are determined by the setting of the zoom values in
the measurement menu. The displayed pair of data can be changed by
pressing the arrow keys up or down.
When entering the menu the measurements of the last 24 hours will be
displayed. This interval can be changed by pressing the keys F1=more or F3='less'.
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SWG100BIO Ex. User Manual
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