Chapter 9: Setting Up and Downloading Sensor Data
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Interval data buffer status
As soon as the sensor begins collecting interval data, the View
Interval Data Buffer Status window will appear. This window shows
you how much of the guaranteed onboard storage space is filled
with interval data. If the data collection setup process has just fin-
ished, the storage space should be mostly unused. If you leave this
window open, the status will be updated every 30 seconds. The
blue bars indicate the amount of memory that contains data. If you
want to force the contents of the sensor’s SRAM buffer to be writ-
ten to flash memory, click the
Transfer>>
button.
Figure 64.
View Interval Data Buffer Status window
The sensor’s SRAM buffer contains up to 246 of the most recent
interval data records. This type of storage is temporary because
SRAM is volatile—its contents will be lost if the sensor’s power
supply is interrupted. The sensor’s flash memory buffer contains up
to 2975 interval data records. This type of storage is permament
because flash memory is nonvolatile—it will retain its contents even
if the sensor’s power supply is interrupted.
The SRAM buffer automatically transfers interval data over to flash
memory buffer every 3600 seconds.
Note.
This screen
can be accessed
by going to
Data
Collection >
Download
, and
clicking the
View
Data Buffer
Status
button.
Note.
If you are
collecting data
with the
Memory
Overwrite
setting
enabled, you won't
typically see the
buffer fill up 100%. In
fact, you may see the
usage fall from near
100% to something
near 80%. This is
because as usage
approaches 100%, a
portion of the oldest
contents are erased
in order to make
room for newer data.
