Characteristics of the Open Circuit Signal are:
1.
Transmits through NON Conductive Materials
The signal that the ECT transmits when tracing open circuits, radiates
what is called an E-field. We will refer to an E-field in this manual as an
“Open Circuit Signal”.
The open circuit signal radiates from wires and passes through non con-
ductive material such as dry carpet, plastic panels or plastic molding. The
receiver is used to detect these signals so you can trace and locate the
open or break in the circuit.
(See “Locking the Sensitivity” pg. 14)
2.
Easily Shielded by Conductive Materials
The open circuit signal is however easily shielded by conductive mate-
rials such as metal, wet carpet, neighboring wires in a harness and even
your hand. This means that if conductive materials are between the trans-
mitting wire and the receiver, the open circuit signal will not penetrate
through and therefore not be detected by the receiver. So it is necessary
to be aware of possible shielding issues and try to avoid them as much as
possible.
A great alternative to the receiver in detecting open circuit signals is to
use the Power Probe III, IV, or Hook by direct contact.
(see “Verify an Open Circuit” pg. 23)
9
Dry Carpet / Plastic Panels & Molding
Holding the receiver by this corner,
prevents your hand from sheilding
the
open circuit signal.
Wet Carpet / Metal/ Shielding Wire Harness
Holding the receiver by this corner
prevents your hand from shielding
the open circuit signal.
Wet Carpet/ Metal/ Shielding Wire Harness
Dry Carpet / Plastic Panels and Mouldings
Open signal passes
through dry non
-conductive material
