E. Directional Null (DirNull)
TRACE [2] + Mode [SK] + DirNull [SK Toggle]
or Menu/OK [5] + Cable/Pipe [SK] + Mode [SK] + DirNull [SK Toggle]
In Directional Null mode, as the operator approaches the cable or pipe, the numerical Signal Strength [9] ([8] for 2550 locator) will increase then fall sharply as the receiver crosses the target cable or pipe. The Bar Graph [11] ([10] for 2550 locator) fills from both sides toward the middle and the receiver speaker volume decreases. As the antenna moves off the target path, the Bar Graph [11] ([10] for 2550 locator) opens, the Signal Strength [9] ([8] for 2550 locator) increases, and the speaker volume increases. Gain adjust is automatic in Directional Null mode.
The center of the DirNull display provides a ‘compass view' of the target path. An arrow will point toward the location of the cable/pipe in
For example:
Figure 1: If the target path is to the right of the receiver, and running parallel to the operator, the right arrow will display.
Figure 2: If the target path is to the left and in front of the operator (not running parallel to the receiver) the arrow will point toward the top left side of
the display.
Figure 3: When the receiver crosses the target path, a solid line will appear, instead of arrows, indicating the target path and its orientation to the receiver handle.
Before marking target path, always use Directional Peak (Dir Pk), Special Peak (Spl Pk) or Trace View (T-View) mode to verify location.
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