Rion VM-55, Instruction Manual, Page: 18 / 204

6
Controls and features
DISPLAY key
This key switches measurement screen display.
Each push of the key cycles through the settings in the following order:
Measurement screen Max Hold screen Processed data screen
Time-level screen Measurement screen
In addition, this key is used to bring up an explanation of the item on the
screen by the help system.
Key lock
Pressing the and keys together activates the key lock. A lock symbol
appears in the bottom left corner of the display (see page 44), and the
operation keys except for the LIGHT key are disabled.
If a key other than the LIGHT key is pressed, a key lock indication appears.
Pressing the and keys together once more cancels the key lock.
To turn the unit off, you must fi rst cancel the key lock and then hold down
the POWER key.
The key lock does not function on the menu list screen and calibration
screen.