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1.3
Transmitting Modes
The transmitter has three transmitting modes, which are selected automatically.
1.3.1
Induction Mode
This uses an internal antenna to induce a locating frequency onto the target
pipe or cable (line). “Induction”
mode is automatically selected if no connection accessories are plugged into the “output socket”. An icon
indicating “Induction” mode shows on the display. The icon flashes when the transmitter is transmitting. In order
to generate successful induction, the transmitter should be positioned over and with the handle perpendicular
to the target line.
“Induction” mode is generally used when no access is available to make a direct connection, or a clamp
connection. When using induction it is very likely that the signal being induced onto the target line will also be
induced onto other lines in the area, and onto above ground features such as wire fences. This can influence
the accuracy of the location, depth and current measure
ments. “Induction” mode is also the least efficient way
of applying the transmitting signal to the target line. The distance located with “Induction” mode is generally
much less than that achieved with a direct connection or clamp connection.
“Induction” mode generally works better in higher frequencies. The advantage of induction is that no access is
required to “connect” the transmitter, making it a very quick process. The antennas on the transmitter are tuned
to induce specific frequencies or range of frequencies. Therefore only a limited number of frequencies can be
selected in “Induction” mode.
All the frequencies in favorite frequencies mode that are higher than 8 kHz can be selected by pressing “f”
pushbutton in main display. Multiple induction frequencies are available based on the user selection. See
section 1.4.2 for adding and removing frequency from the favorite frequencies list.
NOTE
For accurate location and depth measurement the locator receiver should be used
no closer than 50ft (15m) from the transmitter.
1.3.2
Direct Connection Mode
By plugging in a connection lead to the output socket, “Direct connection” mode is selected. An icon confirming
this is shown on the display. The wave in the icon fluctuate when the transmitter is transmitting. The direct
connection lead consists of two cables, one (red clip) must be connected to the conductor being located, the
other (black clip) to a suitable ground (a ground stake is provided with the transmitter). An auxiliary ground lead
is also supplied. If the auxiliary ground lead is used, the ground clip of the connection lead (black clip) is
attached to one end of the auxiliary ground lead.
A good connection is indicated by a change in beep rate from the speaker and the current reading on the
display.
Wherever a direct connection can be safely made without the risk of injury, damage to customer’s plant, or the
transmitter, it is the best way of applying the transmitter’s signal.
