Major tech MT474 Manuel d'instruction - Page 9

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Ÿ The single-pole phase test starts at an AC voltage of approx. 100V (pole

>100V AC).

Ÿ When using single-pole phase tests to determine external conductors

the display function may be impaired under certain conditions (e.g. for

insulating body protective equipment on insulation locations).

Ÿ The single-pole phase testing is not appropriate to determine whether a

line is live or not. For this purpose, the double-pole voltage test is

always required.

Ÿ Connect both test probes with power source.

Ÿ A signal sound indicates the phase.

Ÿ The LED (5) is illuminated in the display.

5.5. Voltage Test with RCD Trip Test

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.

To avoid RCD tripping a test has to be carried out between L and N during

approx. 5s. Immediately afterwards, voltage testing between L and PE

can be carried out without RCD tripping.

5.6. Continuity Test / Diode Test

The continuity test /diode test is only possible when batteries are installed

and in good condition. A signal sound is audible for continuity and the

LED for continuity LED

(8) is illuminated.