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The line with the highest current measurement, rather
than the line giving the strongest response, is the target
line to which the transmitter signal has been connected.
Measuring current provides useful information about the
position of bends and intersections. Measuring current
after a tee will indicate the main line that pulls more current
along its greater length.
Figures 7.4 – 7.6 Taking current readings
Applying a transmitter signal
The transmitter signal can be connected, clamped or
induced to the target line in the same way as the signal for
line tracing is applied.
WARNING! Direct Connection to live conductors is
POTENTIALLY LETHAL. Direct Connections to live
conductors should be attempted by fully qualified personnel
only using the relevant products that allow connections to
energized lines.
Signal current measurements
Pinpoint the line and confirm the accuracy of the Peak
pinpoint with null arrows. Check the locator is directly over
the line, with the antennas at right angles to it and vertical.
The locator will automatically estimate and display depth
on the LCD.
A signal coupled to a nearby line may distort the accuracy
of the measurement. If the accuracy of the reading is
suspect, sweep the area to check if other nearby lines are
radiating the signal. If other signals are causing
interference, it may be necessary to make the current
measurement at another point along the line.
Both antennas are needed to make a current
measurement and locator accessory antennas such as a
normal clamp or stethoscope cannot be used. Because
current measurement is a function of depth, it is only
available in the locating modes. It is also available with
Current Direction (CD) clamps.
Figure 7.7: Current readings using transmitter signa
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