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1. Induction conditions
1) the two ends of the cable must be connected or connected to the ground.
2) the location of the transmitter requires that the sensing test line should be aligned
with the cable.
3) the buried depth shall not exceed 10 meters.
2. The induction signal is applied.
Press the power switch of the transmitter, the frequency is selected high frequency or
the rf power is selected high grade. When the LCD is shown in the right image, the
transmitter normally works.
The transmitter is placed above the known point of the cable and the sensing test line
is aligned with the cable at this point.
2.3.3 Extension of inductive method detection - blind measurement
(1) Blind test principle
Blind measurement is a test method for the detection of unknown metal pipeline and
various cables using the sensing mode of the instrument. It is to use the transmitter
built-in antenna in a certain direction to underground launch (also) into the air high
frequency or radio frequency electromagnetic signal, when electromagnetic signals
encountered underground metal pipelines, the signal will be metal pipeline
transmission, in the form of current transmission line on the secondary magnetic field
and radiation out at the same time, the receiver can be in the top of the line to receive
the secondary magnetic field signal, not only locate the pipeline position of a point,
connect the test to the pipeline location point is the pipeline location to both, this is
the principle of blind test.