T-506 User Manual Version 3.2 | 27
To find the fault point, take readings from the tablet step by step along the cable path within
the specified range. The distance of each reading should not exceed 0.5m, and should be
shortened to 0.2m as required. This may take some time, so patience and meticulousness
are necessary.
During testing in the Waveform mode, it is necessary to note the sound signal at the
moment when the magnetic field signal is triggered. At the same time, check the information
frame of the APP operation interface or observe the characteristics of the sound signal
waveform to judge whether the fault point has been detected.
[
Note
] The cable fault discharge usually produces a short, low-pitched sound. In the
Waveform interface you can observe its waveform characteristics - a curve that oscillates
repeatedly above and below the baseline, with a large amplitude in the middle segment and
a small amplitude at the beginning and end segments. An example is as follows:
[
Note
] When searching for the fault point, the sound gain of the APP must be set to an
appropriate level by adjusting the volume control button of the tablet. Excessive volume in
the headphones may be uncomfortable.
[
Note
] Appropriate sound gain helps to improve the efficiency of the T-506
unit’s ability to
intelligently identify the sound of faults. As a basic principle, in the Waveform interface, the
maximum amplitude of the sound waveform should be at least two-thirds of the total height
such that distortion at the top of the waveform does not occur; in the user interface, the
maximum height of the sound progress bar should be at least three points and should not be
full scale.
6.3
Closing in on the fault
In the process of finding the fault point, we generally have to test and observe the results
multiple times to find the fault point, in the same location.
When the message box of the APP repeatedly prompts “Fault found”; or the fault discharge
sound waveform is observed on the Waveform interface, it means that the fault discharge
sound has been identified, and you are in the proximity of the fault point.
