Which mode is best for tracing and pinpointing the line in congested areas?

• A. Peak Mode
• B. Null Mode
• C. Graphical
• D. Visual

Answer: (A)

Tracing and pinpointing a buried line in a cluttered area relies on using a mode that highlights the strongest signal directly over the conductor. Peak mode achieves this by letting the receiver detect the highest signal output as you move along the path, so the reading stays aligned with the line. As you trace, the peak follows the actual utility, giving you a continuous, precise trace even when nearby pipes or cables create noise or interference. Other modes don’t offer the same reliable cue: null mode depends on canceling signals and can be thrown off by adjacent conductors; Graphical displays show data but don’t provide the steady directional feedback needed to follow the line; Visual methods rely on surface visibility and can’t locate buried lines in congested zones. Peak mode thus provides the most accurate tracing and pinpointing in crowded environments.