Switches Function - Gutermann AQUASCOPE 550 Operating Manual

7.2 Switches function

1. Contrast: Turn the Top Rotary Switch clockwise 1 notch to select the
contrast function then turn the bottom rotary switch to adjust the
contrast- clockwise to darken and anti-clockwise to lighten.
2. Backlight: With the Top switch in the first notch position press the
bottom switch to activate the backlight. The screen indicates the
Backlight is on; press the bottom switch to deactivate the backlight.
Fig.28 F1 Selector
3. Select F1 on the top switch to activate the open Filter 0 to 5000Hz,
which allows the full range sound to be heard once the bottom switch
is pressed. Turn the bottom switch to adjust the volume to at least half
way on the volume level.
Fig.29 Filter 1 0-5000H z