B&K Precision 830C - Manual - Manual (Page 49)

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Brightness Level On State (bON)
This option allows user to set the brightness level for
the on state of the back light. When it is set to “OFF”,
back light will be in the lowest brightness level in the
on state. If a level is set, the backlight will be much
brighter when backlight is enabled by pressing the
button.
Selectable parameters,
OFF, 01, 02, 03
Note: “03” is the brightest and “01” is the dimmest
level. However, when set, “OFF” state will still be the
lowest brightness level.