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16
4 Measuring
Changing the filter level
Action
What happens? / Why?
Information
in display
1.
Press
z
Filter symbol appears
z
Current filter level flashes
z
Instead of the volume the
frequency range is dis-
played
2.
Press
z
Filter level increases
OR
z
Filter level decreases
Press
3.
Press
z
New filter level is applied
z
Filter symbol is hidden
z
Volume visible again
The last filter level used is saved when the device is switched off
or when the batteries are replaced.