Sonel VT-3 Manual De Uso página 7

3.1 Switching the tester ON
Press shortly . You will hear a single beep and the green LED
tester is turned ON and ready to use.
3.2 Switching the tester OFF
Press shortly . You will hear a double beep, and the green LED will go out.
3.3 Disabling and enabling sound signalling
a) When switching the tester ON
Press and hold button
To restore the sound signalling, press and hold button
tester beeps.
b) When the tester is active
Press and hold button
and hold button until the green LED starts flashing and the tester beeps.
3.4 Checking the tester
Before using the tester:

check whether the green LED is ON,

check the tester on a known AC voltage within the measuring range.
3.5 Voltage measurement in High Mode (100 ... 1000 V AC)
Approach the measuring tip of the tester to the tested AC voltage. If the device detects a voltage within
the measuring range, the green LED goes out, the red LED is activated and a modulated beep is emit-
ted.
Voltage measurement in Low Mode (12...1000 V AC)
3.6
Press and hold the 12 V button. LED changes from green to orange to indicate the change of the
measuring range. While pressing the 12 V button, approach the measuring tip of the tester to the
tested AC voltage. If the voltage is detected, the orange LED goes out, the red LED starts flashing and
a beep is emitted.
The frequency of light and sound signals increases, when the tester is closer to the tested voltage. If
the high voltage is detected, the measurement mode automatically switches to 'High Mode': red LED
lights continuously and a modulated beep is emitted.

The tester does not show the voltage value.

The cause of automatic mode change to 'High Mode' may be the type and thickness
of the insulation, distance from the power source or other factors.
3.7 Indicator of discharged batteries
If the green LED is not active, replace the batteries. When the tester is turned ON and the battery level
is too low for proper testing, the tester will beep three times and the green LED will go out, indicating
that the tester cannot be used. Replace the batteries to continue testing.
3.8 Auto-Off
To prolong battery life, the tester will switch OFF automatically after approx. 5 minutes of inactivity.
During the switching OFF process, the device will beep three times and the green LED will go out.
3.9 Flashlight
Shortly press button
automatically after approx. 5 minutes The Auto-Off is signalled by double beep.

If the battery level is too low for sufficient flashlight operation, the tester will indicate
this fact by three beeps. Then the flashlight will go out.

The module for voltage testing has own criterion for the batteries and in the above
situation it may still running. In order to verify it, follow sec. 3.4.
3
until the green LED activates. Now, the tester works without sound signals.
until the green LED starts to flash. To restore the sound signalling, press
, to turn ON/OFF the flashlight. To prolong battery life, the flashlight will switch OFF
VT-3 – USER MANUAL
Operation
until the green LED starts flashing and the
and module will light up. The
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