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● I f a current of 200 mA or higher is detected on the object under test, the
continuity buzzer sounds to indicate that there is continuity. If you wish to
disable this continuity buzzer, please refer to 10. LCD backlight, LED light,
Buzzer.
● A t low-resistance measurements, impedances of the operating circuit
connected in parallel with the instrument may affect the measurement result.
● Circuit protection
T he instrument has circuit protection function: even if touching with a live
circuit during low-resistance measurement unintentionally, the instrument
will have no damage. That is, the instrument is protected and not be
damaged if the open measuring terminals are connected to a live wire.
10. LCD backlight, LED light, Buzzer
10-1 LCD backlight
The illuminance sensor on this instrument detects
ambient brightness and automatically turns on/ off
the LCD backlight and LED light. Once these lights
turn on, they stay on for about 15 sec. This auto-
lighting function can be set to always off.
● K eep the surface of the illuminance sensor
clean to ensure proper detection of brightness.
● T he sensitivity of the sensor isn t adjustable.
Cover the sensor with your finger to turn on the lights manually.
● E ven if working in dimly lit area, these lights turn off automatically if the
function switch isn t operated or the test button isn t pressed for two
minutes. (These lights don t turn off automatically during a measurement or
while live circuit warning is activating.)
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www.calcert.com
15
10
20
5
25
0
30
Fig. 9-1
Illuminance sensor
Fig. 10-1
sales@calcert.com
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