JUMO 702540 TDA-300 / TDA-3000 - Handheld thermometer Operating Manual - Manual (Page 41)

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5 Data logger
From the memory screen (Fn1), you can reach normal display by pressing the
ESC key twice.
h Press the SET key and the memory is
automatically optimized. If you press the
MENU/POWER key, the function is not
executed.
While defragmenting is in progress, it cannot be
canceled.
During defragmentation of the memory, progress is
indicated. The optimization time depends on the
memory condition. If automatic data logging was
active, it remains active during optimization; it is
not ended.
Do not press any key as long as defragmenting is
in progress.
When the optimization procedure is finished, the
instrument returns to the memory display (Fn1).