RIDGID NaviTrack 10 Betreibershandbuch PDF herunterladen (Seite 14)

www.navitrack.com Ridge Tool Company ● Elyria, Ohio ● U.S.A

NaviTrack Brick Line Transmitter

Coupling through Air

When a line transmitter is set to Inductive Mode, it

energizes a wire or pipe under it by emitting a pulse

of energy at the selected frequency. This pulse

forms an electromagnetic field which induces a

current into the conductor (the pipe or wire)

underneath it. The field builds and collapses at the

frequency at which the pulse is generated by the

transmitter.

A secondary field is set up around the pipe or wire by

the current induced into it. This secondary field is

normally round in shape, just as it would be if you

connected the transmitter directly. But the primary

field from the transmitter, which does the inducing, is

not round, and is not the same as the field set up on

the pipe or wire.

The field generated by the transmitter in Inductive

Mode has a shape something like a football. When

the transmitter is sitting on the ground, roughly half of

that field extends below it. The ends of the “football”

extend out past the central axis of the transmitter in

the same direction as the pipe or wire under it.

Figure 12: Air-Coupling in Inductive Mode

Near the transmitter, the receiver reads on the

local dipole field around the transmitter.

If the receiver is within this field, it will read clearly

and well on the transmitter, rather than on the pipe or

wire being traced. The transmitter and the receiver

will couple through the air for a limited distance

around the transmitter. This problem does not occur

with direct coupling, and is not important when using

an inductive clamp. But it can be an issue when using

the transmitter in purely Inductive Mode (i.e., without

a clamp.)

It is important to set up the transmitter, when using

the Inductive Mode, a good 30 feet (10m) away from

the region where tracing occurs, and to be aware of

the difference between the transmitter’s field and the

induced field being traced. They will both have the

same frequency, but the transmitter’s field is limited

to the region around the transmitter itself.

Note: The inductor core of the ST-305 emits the

signal when the unit is transmitting in Inductive

Mode. A hard hit or a drop could possibly damage

the core. To test that the core is intact using a

SeekTech SR-20 receiver:

1. Power transmitter on.

2. Set frequency output to 33kHz.

3. Set power level to high power.

4. Power receiver on.

5. Set to receive 33kHz.

6. Move receiver 12 inches from transmitter.

If the inductor core is undamaged, the receiver

should show a Signal Strength reading larger than

2000.

High Voltage Indicator

Whenever the line transmitter encounters voltage

higher than 62 VAC, it will flash a red LED at the top

of the keypad. Should this occur carefully disconnect

the transmitter using high-voltage precautions.

Figure 13: High Voltage Warning LED

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