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5
Loc-10Tx Transmitter
5.2
Transmitting Modes
The transmitter has three transmitting modes, which are selected automatically.
5.2.1
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 in line
with the target line.
Icon
"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 measurements. "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, 33 kHz, 65 kHz and either 83.1 kHz or 200 kHz (depending on
region). 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.
NOTE
For accurate location and depth measurement the locator receiver should be used
no closer than 50ft (20m) from the transmitter.
Page 25
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