Class 1 Sound Level Meter NL-53 / Class 2 Sound Level Meter NL-43
with Extended Function Program NX-43EX Instruction Manual Operation Guide

10.5 When taking measurements in a dark place

When you touch the screen or press a key during automatic brightness change or “screen off” operation, the backlight of the LCD screen turns on, making it easier to see the display in dark environments.
If you want to turn off the backlight while it is on, touch [Light Off] on the menu ring.

Set the brightness and lighting time of the backlight as follows.

1Touch [Menu] on the measurement screen.

The [Menu] screen appears.

2Touch [System] on the [Menu] screen.

The [System] screen appears.

3Touch [LCD Settings] on the [System] screen.

The [LCD Settings] screen appears.

4Set the brightness and lighting time of the backlight.

(s = seconds, m = minutes)

Item	Description
Brightness	Select the brightness of the backlight from 1 to 4. * Setting it to “4”, continuous operation time on batteries is shortened by about 50%, and setting it to “1”, by about 30% compared to automatic brightness change or the “screen off” operation.
Backlight Auto Off	30s If no operation is performed for the selected time, the backlight will be darker than brightness level “1” and will be in the same state as the “screen off” state. 3m Continue The backlight stays on.
LCD Auto Off	The continuous operating time with batteries is about 30% longer under this setting compared to when set to change to automatic brightness. 30s When taking measurements in Auto store or Timer Auto store mode, if no operation is performed within the selected time, the backlight will turn off completely. 1m 2m 5m Continue The backlight stays on.