Cable Path Detector
Darui Electric recommends：
Cable Path DetectorBasic Principle
Select Operating Mode
Press the Path key to enter path detection mode
Peak Method Detection
Rotate the sensor so its axis is perpendicular to the handle and horizontal to the ground. When carrying the sensor, keep its axis perpendicular to the cable. Move the sensor across the possible cable path and observe the signal amplitude. The closer to the cable, the stronger the signal and the louder the headphone sound. When directly above the cable, the signal is strongest — hence the peak method.
To properly observe signal amplitude, adjust signal gain: when the sensor is directly above the cable at maximum signal, the amplitude should be between 40~80%. If too high, rotate the "Path Gain" knob counterclockwise to reduce gain; otherwise increase gain.
Null Method Detection
Rotate the sensor so its axis is parallel to the handle and perpendicular to the ground. Move the sensor across the possible cable path and observe the signal amplitude. The signal is weakest directly above the cable, strengthens when deviating, then weakens again beyond a certain point. This creates a saddle-shaped curve. Because the weakest signal (null) is directly above the cable, it is called the null method.
The null method also requires adjusting path signal gain so that at maximum signal, the amplitude is between 40~80%.
80% Method Depth Measurement
First use the peak method to find the point of maximum signal amplitude and note the value. Then move the sensor horizontally left and right to find the points where the amplitude drops to 80% of the maximum on both sides. The distance between these two points equals the cable depth. Note: if adjacent pipelines exist, induced current effects may cause the maximum amplitude point to deviate slightly from directly above the target cable, and the distances from the maximum to the 80% points on each side may not be equal.
45° Method Depth Measurement
On both sides of the cable, adjust the handle in opposite directions so the sensor axis forms a 45° angle with the ground. Move across the cable path and find the points of weakest signal amplitude on each side. The distance between these two points is twice the cable depth.
Note: The above information and technical parameters are compiled and published by Yangzhou Darui Electric Co., Ltd.
