KYORITSU 4300 - Manual (Page 20)

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9. LCD backlight and LED light
The LCD backlight and the LED light on this instrument turn on/off
automatically in relation to ambient brightness. These lights keep
on for about 15 sec once they turn on. The Ambient light sensor as
shown in the below figure senses the ambient brightness.
● Dirt on the surface of the sensor may interfere the proper
operation of the lights. Keep the sensor clean.
● The sensitivity of the sensor is not adjustable. Cover the sensor
with your hand or finger if you need to turn on the lights. The
lights keep on for about 15 sec once they turn on.
[Turning off the Auto-light mode]
The following procedure is for setting the lights always off.
1. Ensure that the instrument is powered off.
2. Hold down the Power button for 1 sec while the Test button is
held down and power on the instrument.
3. Now the Auto-light mode is disabled. Repeating above steps
1.& 2. restores the mode.
The number of beep when powering on the
instrument is different depending on the
selected light mode. The selected mode
will not be reset even after powering off the
instrument.
Number of beep Light mode
Once Auto
Twice Always off
Ambient light sensor
Buzzer sounds
when powering on
the instrument.
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Fig. 9-1
Fig. 9-2