User's Manual
78
CHAPTer 7 o DATA COLLECTION
Note
This screen can be accessed via the Data Collection Download screen by
clicking on the View Data Buer Status buon.
The sensor’s SRAM buer 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 ash
memory buer contains up to 2975 interval data records. This type of storage is
permament because ash memory is nonvolatile—it will retain its contents even
if the sensor’s power supply is interrupted.
Note
The smallest amount of ash memory that can be erased at one time
represents several interval data records. As a result, if you are collecting
data with the Memory Ovewrite feature enabled, you will not typically see
the buer ll 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.
If you want to force the contents of the sensor’s SRAM buer to be wrien to
ash memory, click the Transfer>> buon.
Data Download
To download interval data stored on the sensor in the SRAM and ash memory
buers—such as data collected in a study—go to Data Collection>Download.
The screen that comes up is divided into two sections, Download Interval Data
and Interval Data Buers (see Figure 7.3).