SD Logger
４
instruction manual[X519009-3]
20/28
<2020/03/03>
（
3
rd
edition
）
Ⅵ
Response to power shutdown
1.
Auto sync function
When data is lost for 3 seconds, the data remaining in the buffer is written to the
card and the consistency of the file structure is restored.
As a result, data received more than 3 seconds ago will not be lost even if the
power is suddenly shut down.
In addition, even if the power supply is cut off without receiving data for more
than 3 seconds, the file structure will not be damaged.
2.
Capacitor backup
Even if the external power supply is cut off, the internal power supply is
secured by the capacitor.
Even if the power supply (main power supply) to the DC power connector is cut off
while the power switch is ON, the power is supplied from the backup capacitor and
the shutdown process is performed.
When the shutdown process is completed, the logger will cut off the power supply
to itself.
Power is supplied from the backup capacitor for a short time during the shutdown
process.
Even if the external power supply is suddenly cut off due to auto sync and
capacitor backup, the possibility of damaging the file structure is low.
Notes
The time required for the shutdown process varies depending on the usage
conditions of the card used.
On the other hand, the backup time with a capacitor is limited.
Please fully verify the effectiveness under the conditions of use.
