Line Tracer
9
Notes:
Inductive sensor contains a winding. The best sensitivity is always achieved when the
winding axis is parallel to the magnetic field around the searched object. Always try to
find the best signal by rotating the sensor around its axis.
The traced object with good conductivity has very low voltage drop and weak electrical
field in parallel with it.
If a source in active load mode is connected to the energized line with significant
internal impedance then voltage variations of loading are also sources of electrical field
around line. The detectability of the electrical field is mentioned below.
Electric field
Electric field is always present between two conductors or points of different potential. In
most cases the potential is between a conductor and ground or between two neighbor
conductors.
Example Basic circuit Description
Free conductor
U
E
- electrical field is distributed
around conductor
- maximum magnitude of electric
field between conductor and
closest conductive ground
- CAPacitive sensor is applicable
for tracing
Two conductors
and wide
distance
U
E
- electrical field is distributed
around each conductor
- maximum magnitude of electric
field between conductors
- CAPacitive sensor is applicable
for tracing
Two conductors
and tiny
distance
U
E
- major part of electric field is
concentrated in a gap between
conductors
- rest of the field depends on
distance between conductors
- CAPacitive sensor is applicable
for tracing (up to a few cm
distance)
Note for shielded conductor:
if source (U) is connected between inner conductor and shield no field can be detected.
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