magnetic difference cursor. At the Same time, there is the value of difference on the
lower right of the sound waveform, in milliseconds (Speed is about 60 cm/ms,which
is different for different geological condition). The smaller the value of magnetic
sound difference indicate that the closer the probe is away from the point of fault.
Gradually move the probe to determine the smallest value of magnetic sound
difference to precisely locate the fault point.
When it’s in "on" state
:(displaying "Sampling = ON" below), up or down arrow
key "↓" or "↑" is used to adjust the amount of sound signal amplification. When you
press the up and down arrow keys, the value of "the sound gain = ??%" will change.
Left or right key "→" or "←" is used to adjust the amount of magnetic amplification.
When you press the left and right arrow keys, the value of "magnetic Gain = ??%"
will change. In usage, according to the signal strength, adjust the size of sound gain
and magnetic gain to facilitate analyzing waveform.
Left or right side of Cable judgment
: The location instrument has a function of
judging left or right side of cable, which is able to detect which side the probes of the
location instrument current point is on the cable. During high-voltage continuous
ignition, move back and forth the probes of the location instrument around the fault
cable. Meanwhile observe the electromagnetic waveform of the location instrument.
when the first wave-shaped form of the electromagnetic wave is changed, it means
that the probe has been moved from one side to the other side of the fault cable.
Discrimination of electromagnetic waveform is based on the first positive pulse
waveform(upward) or negative pulse(downward). That is to say, after the probe is
moved, the first wave of a pulse waveform is changed, then the cable passes through
the probe and the last point.
