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As a matter of convenience the Model
X Transmitter Case has been
designed with two DIRECT output ports SIGNAL[ ] and SIGNAL[ ] Having
two ports enables the user to directly energize two separate lines at the same
time (at different frequencies of course)
Although this feature is available to the user the user must exercise care
when using it Not all job situations lend themselves to dual energizing The
network of underground utilities in any given area may be convoluted For
example it is not unusual for gas and water utilities to be somehow
electrically connected It is very common for electrical services to be
grounded to another utility like water A few simple rules should be applied
to determine whether using dual energizing is feasible:
(a) Check to make sure that the target lines are not electrically connected
Using an ohmmeter check the resistance from line to line Measure
from the exposed area of one line to the exposed area of the other line
If you measure a low resistance then dual energizing will not work
Instead both lines will be energized at both frequencies
(b) Try to energize the lines with lower frequencies Using low ( KHz and
lower) frequencies will prevent “induction slopover” or cross talk
between lines
(c) Use an appropriate output level for the tracing situation Applying an
excessive amount of power to the target lines can cause signal flooding
It is recommended to start at the lowest output level (
) and then
increase it if more power is needed for the trace
