30
the pipeline and adjust the sensitivity so that the strength bar is between 60-80% of the
entire range. Walk away from the transmitter, while moving the receiver to sides. When it
shows that the middle is the peak with both sides diminishing, it means that the person
who is locating is walking above the pipeline and he can make the long-distance tracking.
(3) Valley (Minimum) Mode
The valley (minimum) mode uses a vertical antenna to receive the vertical
component of the target pipeline and the receiver receives a minimum response
directly above the target pipeline. Valley (minimum) mode is intuitive, fast, but
susceptible to interference and of poor accuracy. This method is mainly used to
quickly track the pipeline and verify the accuracy of the response received from the
peak method. The use of the valley (minimum) mode can speed up tracking the
pipeline and you can hold the receiver at any angle because the zero value does not
depend on the direction of the pipeline. When walking along the pipeline, the
receiver can get the minimum value and the sound is the smallest above the pipeline.
When the receiver is moved left and right, the reading of the strength bar will
increase to a peak and the sound will increase too. Therefore, observe the zero value
response and the peak response on both sides of the pipeline during the detection
process.
Illustration of Valley Mode
Содержание HZ-5000
Страница 1: ...HZ 5000 Underground Cable Detector User Manual Huazheng Electric Manufacturing Baoding Co Ltd...
Страница 35: ...33 Figure a Illustration of Deeper Pipes Figure b Illustration of T Branch Pipe...
Страница 36: ...34 Figure c Illustration of the Pipe that Changes Directions Figure D Illustration of Detection of Pipe Ends...
Страница 37: ...35 Figure e Illustration of Detection under Steel Mesh Net Illustration of Depth Measurement...
