Campbell Scientific CR3000 Micrologger User Manual
Page 278
Section 7. Installation
278
card must be inserted before the data table in datalogger CPU memory rings
2
, or
data will be overwritten and lost. For example, consider an application wherein
the data table in datalogger CPU memory has a capacity for about 45 minutes of
data
3
. The exchange must take place anytime before the 45 minutes expire. If the
exchange is delayed by an additional 5 minutes, 5 minutes of data at the beginning
of the last 45 minute interval (since it is the oldest data) will be overwritten in
CPU memory before transfer to the new card and lost.
1
Other options of
TableFile()
do not pre-allocate memory, so they should be avoided when
collecting high-frequency time-series data. More information is available in CRBasic Editor Help.
2
"rings": the datalogger has a ring memory. In other words, once filled, rather than stopping when
full, oldest data are overwritten by new data. In this context, "rings" designates when new data begins
to overwrite the oldest data.
3
CPU data table fill times can be confirmed in the datalogger
Status
table.