Ridge Tool Company
●
Elyria, Ohio
●
U.S.A
www.seektech.com
9
SeekTech ST-305 Line Transmitter
WARNING
NEVER CONNECT TO LINES KNOWN TO BE
ENERGIZED WITH A POTENTIALLY
DANGEROUS ELECTRICAL CURRENT. To
increase safety,
the ground lead should be
attached first
. If there were an unknown high
voltage running through the target line, this would
allow a means of redirecting the current away from
the transmitter and operator.
Note
: Installations which use plastic pipes will
typically have a trace wire installed along the pipe
for tracing purposes. Simply clip the transmitter
lead to the trace wire.
Power the ST-305 up by pressing the Power Key. A
multiple-tone will sound on powering up. After a short
silence, the unit will begin beeping regularly
indicating current is flowing.
2. Select a Frequency on the Transmitter.
The ST-305 line transmitter offers four choices of
frequency. Frequency is chosen by pressing on the
Frequency Select Key which will light the LEDs in
sequence.
Available frequencies are:
1 kHz
8 kHz
33 kHz
262 kHz
European version: 93 kHz (93,623 Hz.)
Figure 7: ST-305 Showing 8KHz, Medium Power
The selected frequency is shown by a lit LED. The
262 kHz is shown by a rapid flashing of the 33 kHz
LED. (European version: 93 kHz.)
To set the unit on 262 kHz, press the Frequency Key
for more than one second (long press). The 33 kHz
LED will start flashing rapidly, indicating a 262 kHz
frequency. (European version: a long press will select
93 kHz, causing the 33 kHz LED to flash rapidly.)
(For information on using dual frequencies see page
10.)
3. Check the Circuit and Adjust Power
Level
Confirm the circuit is grounded by checking the
connection to the ground stake is secure and the
stake is firmly embedded in the ground. To adjust the
power level, press the power button briefly. The ST-
305 will cycle through the low, medium and high
power levels.
Note
– Higher power settings produce more
current, which gives a stronger signal. Less current
prolongs battery life. Signal strength measured by
the receiver is directly proportional to the amount
of current on the line. More current will produce a
stronger signal received by the receiver.
Use only as much current as is needed to get a
strong reading on the receiver.
Generally the lower the resistance the more
efficiently current can be added. A lower resistance
indicates an efficient circuit and requires less voltage
to charge the line. Things that increase resistance
include paint or dirt on the connection points, very dry
soil, poor ground connection, poor insulation on a
wire, or breaks in the conductor.
Power Settings
There are 3 power settings available:
•
Low
power (approximately .5 watt)
•
Medium
power (approximately 2.0 watts)
•
High
power (approximately 5 watts).
Low power will provide the least current with the
longest battery life. Actual power output will vary with
circuit resistance and frequency used. These values
assume a nominal 320-ohm load.
