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ENGLISH
RT390 is designed for use with North American 3-wire grounded 120V
electrical outlets. DO NOT connect to higher voltage electrical supplies.
Prior to use, always verify tester operation by testing on a known
live and correctly wired electrical outlet.

POWER ON/OFF

Press and hold the Power/Reset button
OFF the tester. When the tester is powered ON and not connected to a circuit,
will display "OOO", "Open Hot" condition. NOTE: The tester will
the LCD
2
automatically power OFF after 5 minutes of inactivity to conserve battery life.
NOTE: Auto-Power Off is disabled if tester is plugged into an energized circuit.
WIRING CONDITION
With the tester powered ON and inserted in the outlet, the
will illuminate, and the Circuit Energized Indicator
Indicator 3
at the top of the LCD if voltage is detected. The tester will display the wiring
condition
and the line voltage
E
outlet, the tester holds the information on the LCD for 10 seconds and the
Hold Indicator
Indicator
will blink. The LCD will reset once it is plugged into another
E
circuit, or, if no voltage is detected, the Wiring Condition Indicator
blink during the time-out period.
If the tester indicates that the outlet is not wired correctly,
consult a quali ed electrician.
NOTE: Conditions NOT indicated include, but are not limited to, quality of
ground, multiple hot wires, reversal of neutral and ground conductors,
and combinations of defects other than dual open neutral and ground.
NOTE: All appliances or equipment on the circuit being tested should be
unplugged to help reduce the possibility of erroneous readings.
Neutral
(White)
Ground (Green)
WIRED CORRECTLY
OPEN GROUND
OPEN NEUTRAL
OPEN HOT
DUAL OPEN (NEUTRAL & GROUND)
REVERSED HOT/GROUND
REVERSED HOT/NEUTRAL
*Expected voltage reading on LCD based on the indicated wiring condition.
NOTE: If the detected voltage is either low (30–85V AC) or high (135–150V AC),
the voltage displayed on the LCD will change from white to red. It is possible to
have the voltage displaying in red (indicating low or high voltage) and the green
6
OPERATING INSTRUCTIONS
will be displayed. During this time, the Wiring Condition
L
Hot
(Black)
"CORRECT WIRING" message
for two seconds to power ON/
1
on the LCD. If removed from the
D
LCD WILL DISPLAY
"ENERGIZED"
will appear
B
will
E
VOLTAGE*
simultaneously.
E

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