NaviTrack® II
Figure 28 – Screen Display in Different Locations (Active Line Tracing)
Passive Line Tracing
In passive mode the NaviTrack II senses fields gener- ated by wires carrying alternating current (AC), without a transmitter being attached. Buried power lines typically do not emit any traceable signal unless power is flowing in the wires. For example streetlights that are turned off can be hard to trace passively. Due to coupling (either through induction or through capacitance), all metallic lines in an area can be energized passively. Because of this, it is possible to locate lines passively but it can be difficult to identify which line the operator is tracing.
1.Select a Passive AC Trace Frequency with the pas- sive line trace icon.
Trace Line 
(Solid)
Distortion Line (Dashed)
Figure 29 – 60 Hz Passive Trace Frequency
2.The NaviTrack II has two passive AC tracing fre- quency settings. They are 50 Hz, and 60Hz. The 50Hz and 60Hz frequencies are set to respond to the 9th harmonic of the commonly used AC frequen- cies. U.S. installations are typically 60 Hz, while European installations are typically 50 Hz.
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