RIDGID SeekTech ST-305 Operator's Manual page 10

SeekTech ST-305
Figure 11 – Inductive Clamp in use
To use the ST-305 in Inductive Mode do the
following:
1� Be sure that the transmitter is positioned correctly over
the line�
Figure 12 – Orientation to the Line - Inductive
Mode
10 – English
Find Quality Products Online at:
NOTE: If using the ST-305 in Inductive Mode, be certain to
switch Inductive Mode off if you are going to use the unit in
direct connect mode� Air coupling can create very confus-
ing signals if you inadvertently have the unit set to Inductive
Mode and are trying to use it in direct connect mode�
Coupling through Air
When a line transmitter is set to Inductive Mode, it energizes
a wire or pipe under it by emitting a wave of energy rising
and falling at the selected frequency� This forms an electro-
magnetic field which induces a current into the conductor
(the pipe or wire) underneath it� The field builds and collaps-
es at the frequency generated by the transmitter�
A secondary field is set up around the pipe or wire by the
current induced into it� This secondary field is normally
round in shape, just as it would be if the transmitter were
connected directly� But the primary field from the transmitter,
which does the inducing, is not round, and is not the same
as the field set up on the pipe or wire�
Figure 13 – Air Coupling
The field generated by the transmitter has a shape some-
thing like a football� When the transmitter is sitting on the
GlobalTestSupply
www.
NOTE: A slight tilt to the axis of
the conductor can help reduce
the probability of air-coupling
2� Power the transmitter ON� Push the Inductive Mode
switch to induce a signal onto the line without a direct
connection� A long beep will sound when entering
Inductive Mode and the Inductive Mode LED will light �
3� Clips and leads are not used� Note that for a clear
signal using induction, both ends of the utility should
be grounded�
4� The transmitter will emit a series of regular beeps as
long as it is in Inductive Mode�
5� Lower frequencies couple poorly� Therefore, the ST-305
transmitter in Inductive Mode defaults to 33 kHz� Higher
power is usually required for a clear signal in Induc-
tive Mode� Pressing the power key will cycle through
the three available power levels: low, medium, and high�
.com
sales@GlobalTestSupply.com