KYORITSU 6011A - Manual (Page 28)

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9. The external earth terminal
．The external earth terminal at the ranges of Loop, PSC and RCD, the buzzer
warns that the mains earth is switched to the external earth terminal.
Connect the external earth probe firmly to a new earth point and press the
test button to measure loop impedance. If the connection of the external
earth probe and the terminal is normal, the move of symbols is repeated on
the LCD, and finally, the measured value is displayed.
LCD Display when the external earth terminal is used.
LCD Display when the IEC connector is used.
If the external earth probe is badly connected, the following symbol will be
shown on the LCD and the measurement will be stopped.