Amprobe CT-326-C Manuel de l'utilisateur - Page 16
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5. Press the probe's "ON" button and wait for it to calibrate.
6. Place the tip of the receiver to the grounded side of the transmitter. The receiver should
indicate a full scale reading of 10 LEDs. If the receiver does not indicate this, the voltage that
is being applied will have to be increased or total resistance of the circuit will have to be
reduced.
NoTE: Soil has minimal effect on the magnetic field created by the T300 transmitter. However,
the signal will be reduced by as much as 50% when the return path is through ground due to the
cancellation effect of the return signal. Typically, more voltage will be needed for dry soil and/or
longer conductor lengths. Refer to the application notes of the CT-326-C to find the voltage that
must be applied to the transmitter to overcome the effects of resistance and Inductance of the
circuit to develop acceptable signal strength.
Neutral Wires and Ground Wires
1. Plug the pigtail connector into the transmitter.
2. Attach one of the pigtail connector's insulated clip leads to the circuit's neutral or ground.
3. Attach the other lead to a grounded 9 V battery (see Fig.9) as an alternative, clip the other
lead to the "hot" side of any grounded 6-300 V power source. For example, an extension cord
that is plugged into an energized outlet works well.
4. The transmitter's LEDs will blink if the neutral wire is connected at the panel allowing the
circuit to be traced.
5. Trace the neutral or ground wires with the receiver as explained in "Wires in Floors, Walls,
Ceilings and Conduits."
NoTE: Be sure to follow the neutral or ground wire and not the "hot" conductor from the circuit
used to supply power to the transmitter.
open breakers
1. Attach the transmitter and use the probe to trace the neutral wire on the dead circuit as
explained in steps 1-5 for neutral wires, ground wires.
2. When you can see the panel box, discontinue the above method and locate the correct circuit
breaker panel and the neutral line within the panel as explained in "Circuit Breakers and
Fuses."
3. Visually locate the neutral's corresponding "hot" wire and circuit breaker. Use a voltmeter to
verify the open breaker.
1.800.561.8187
Fig.9
14
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