2. Press the 0° /180° switch to change the phase and repeat step (1).
3. Change the phase again and repeat step (1).
b) Auto Test
Measurements are automatically performed under the Auto Test function in
the following sequence: X1/2(0° ), X1/2(180° ), X1(0° ),X1 (180° ), X5 (0° ),
X5 (180° ).
1) Press F1 to select Auto
2) Press F2 & F3 to select IΔn & RCD type
3) Press the Test button. The KT64 will automatically conduct the sequence
as above. When the RCD trips each time reset it.
4) Return to the tester and the results will be displayed
▲ Be sure to return the tested RCD to the original condition after the test.
▲ When the Uc voltage rises to UL value or greater, the measurement is
automatically suspended and "Uc > UL" is displayed on the LCD.
▲ If " IΔn" setting is greater than the rated residual current of the RCD, the
RCD will trip and "no" may be displayed on LCD.
▲ If a voltage exists between the protective conductor and earth, it may
influence the measurements.
▲ If a voltage exists between neutral and earth, it may influence the
measurements, therefore, the connection between neutral point of the
distribution system and earth should be checked before testing.
▲ If leakage currents flow in the circuit following the RCD, it may influence the
measurements.
▲ The potential fields of other earthing installations may influence the
measurement.
▲ Special conditions of RCDs of a particular design, for example S- type,
should be taken into consideration.
▲ The earth electrode resistance of a measuring circuit with a probe shall not
exceed table1 (page 10).
▲ Equipment following the RCD, e.g. capacitors or rotating machinery, may
cause a significant lengthening of the measured trip time.
RCD
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