Major tech MT472 Gebrauchsanweisung - Seite 8

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5. OPERATION

Ÿ Test the voltage tester on a known source.

Ÿ The voltage testers may no longer be used if one or several functions

fails or if no functional reliability can be detected.

Ÿ The instruments are equipped with an internal load enabling the tripping

of an RCD protection device of 10mA or 30mA.

Ÿ For voltage tests (L towards PE) in systems with RCD devices, the RCD

may be triggered. To avoid RCD tripping first test between L and N

(approx. 5s). Immediately afterwards testing L towards PE can be

carried out without RCD tripping.

Ÿ Connect both test probes with power source.

Ÿ As from a voltage of >6V the voltage tester switches on automatically.

Ÿ The voltage is displayed via LEDs.

Ÿ For AC voltages "-" LEDs are illuminated.

Ÿ The instruments are equipped with an LED row comprising: ±12, 24, 36,

50, 120, 230, 400, 690V AC/DC. For DC voltage, the polarity of the

voltage displayed refers to the instrument test probe (+).

Ÿ Due to technical reasons the instrument cannot effectuate an automatic

switch-on for DC voltages within the range of approx. 0V to –/+4.5V.

Without pressing both low impedance buttons, the following voltage steps

(AC or DC) can be indicated: ±24, 36, 50, 120, 230, 400, 690V AC/DC. By

pressing both low impedance push buttons the voltage tester switches to

a lower internal resistance (suppression of inductive and capacitive

voltages). Thus, the indication of low impedance (5) is also activated. The

duration of the test with a lower internal resistance of the device (load

test) depends on the value of the voltage to be measured. To prevent

excessive warming of the voltage tester, it is equipped with a thermal

protection.

During voltage tests in systems equipped with RCD circuit breakers, a

RCD switch can be tripped at a nominal residual current of 10mA or 30mA

by measuring the voltage between L and PE.