A skipped system scan can be seen in the datalogger Status table. It indicates there was not enough time for the datalogger to do its background calibration procedures, which it does on a regular cycle. (Refer to the datalogger’s manual for more details.)
If these system scans are skipped, they are usually deferred until the next time they should run. This may not necessarily be a problem as long as the system scan does run some of the time. All it means is that the datalogger becomes slower to respond to changes, such as temperature, which can affect the datalogger’s calibration.