4 Pressing the ATT switch (F2) disables ATT mode. Then ATT OFF is
displayed on the LCD.
▲ ATT mode enables a measurement without tripping the RCDs with the rated
residual current of 30mA or more.
▲ Measurement in ATT mode requires longer time than that is required for
the other measurements (approx. 7 sec). When measuring a circuit with
a large electrical noise, the 'Noise' Message is displayed on the LCD and
the measurement time will be extended to 20 sec. If the 'NOISE' symbol is
displayed on the LCD, it is recommended to disable the ATT mode and take
a measurement (RCDs may trip).
▲ If an impedance of 20Ω or more is measured between L-N during
measurements with ATT enabled,L-N>20Ωis displayed on the LCD
and no measurement can be made. In this case, disable the ATT function
and make measurement. When a large contact voltage exists in the circuit
under test,N-PE HiVis displayed on the LCD and no measurement can
be made. In this case, disable the ATT function and make measurement. Be
aware that if the ATT mode is disabled, RCDs may trip.
▲ ATT mode is automatically enabled after one measurement when making a
measurement with ATT mode disabled.
Fig. 30
LOOP/PSC/PFC
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