P3 International Kill A Watt PS Operating Manual page 9

6. Ground OK, Wiring OK detection: When you connect the unit to a wall outlet, the unit will check the
structure wiring to determine and wire faults. The unit checks the Line, Neutral and Ground wiring.
Under normal conditions, "Ground OK" and "Wire OK" icons will display on the LCD. If Line or Neutral
are in the wrong positions, the "Wire OK" icon will disappear. If the Ground wiring is not correct, both
"Ground OK" and "Wire OK" icons will disappear.
7. Surge Protection: The unit features a self-test function. If the surge protection circuitry is operating
properly, the LCD display with indicate with the "Surge OK" icon. If the surge protection has failed, the
"Surge OK" icon will disappear.
8. EMI Filter: The unit features a built-in EMI (electro-magnetic interference) filter to reject noise from the
AC power line.
9. Internal Switch Self Test: The LCD will flash the "REPLACE" icon and sound an audible alarm if the
unit detects that the internal relay switch has failed.
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