RIDGID SeekTech ST-510 Operator's Manual page 12

SeekTech ST-510 Line Transmitter
4. Check the Circuit
More current 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 means a stronger
signal will be received by the receiver.
To prolong battery life and reduce the chance of the
signal "bleeding over" onto adjacent lines, use the
minimum amount of current needed to get a clear
reading on the receiver.
Look at the ohms (Ω) (resistance), the voltage (V)
and the current (mA) displayed on the screen.
Generally the lower the ohms (total resistance) the
more efficiently current can be added. Lower total
resistance indicates an efficient circuit and requires
less voltage to illuminate the line.
Figure 11: Display Panel
Note: Ohms, current, power and voltage displayed
are approximate values.
The transmitter will beep faster if the resistance is
lower, and slower if the resistance is higher. See
notes about Resistance and Impedance on page 16.
5. Adjust Current
Use the up and down arrows to adjust the amount of
current in milliamps (mA).
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
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FAX 781.665.0780 - TestEquipmentDepot.com
Figure 12: Current Selection (Up and Down Arrows)
There are 7 current levels that the user can choose
from: 5, 25, 50, 100, 200, or 400 mA.
Figure 13: Current Selected
When a current level is chosen, the transmitter will
adjust the voltage to try and produce the selected
current and lock it in. If the transmitter cannot
produce the current selected it will adjust down to the
next level.
The transmitter's maximum current output depends
on the amount of resistance in the circuit. When the
transmitter is putting out the maximum current
possible for internal and external conditions, MAX will
be displayed in place of the current strength number.
Figure 14: MAX Current
MAX will also appear if the power output of the
transmitter is at its allowable limit. (See FCC limits in
the Useful Information sectionon page 17.)
When the current drops below 5 mA, "LO" will appear
instead of a number.
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