Interference Voltages - koban KVD-01-33 Manual De Instrucciones

detector contact electrode is in contact with the live conductor. If
the voltage on the conductor is less than the threshold voltage of
detector, then High Bright Red Leds and the audible alarm will not

16. Interference voltages

the detector may occur.
Erroneous indication will only occur if the body of the detector is
Correct indication can be achieved by applying the detector
to horizontal conductors away from bends or connections.
Unambiguous indication of the detector depends upon the
capacitance of the detector to earth being unaffected by other
In-Phase Interference
This occurs when the conductor under test is adjacent to another
conductor whose voltage is in-phase.
detector and earth, thereby reducing the effective capacitance of
the detector to earth.
This results in an increased threshold voltage which could mean
that the detector will not indicate that a conductor is live.
This increases the threshold voltage of the detector which may,
therefore, not indicate. This is of course a dangerous situation.
Phase-Opposition Interference
If a conductor under test has adjacent conductors which are
in phase opposition, then erroneous indication can occur. For
instance, if the conductor under test is earthed and the detector
came close to a live conductor then it is possible that the detector
will indicate that the conductor under test is live. This, however,can
be seen as a fail safe condition, although it is incorrect.
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