Hioki FT4310, Instruction Manual, Page: 34 / 72

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Auto Backlight-off (Automatic Light-off Function)
3.3 Auto Backlight-off (Automatic
Light-off Function)
The backlight of the instrument will automatically turn off after approx. 3
minutes has passed since the last operation.
The automatic light-off function can be canceled when working continuously
in a dark location.
Disabling the function
Continuous
short beep
Press for approx. 2 seconds.
Backlight: Off
With the backlight off, press
for approx. 2 seconds
until the instrument beeps
continuously.
Setting the rotary switch in OFF cancels the disabled state.