TRACER PRODUCTS Marksman II Serie Manual Del Operador página 15

Mechanical Malfunctions
The photo to the right shows a typical way to
inspect a potential wheel bearing problem. In
this case, the air probe is used since the
wheel is being turned while listening for the
sound of the bearings. The tip of the probe is
kept 2-3 inches from the inspection area.
Response can sometimes be optimized by
removing the wheel and using the contact
probe to touch the stationary center hub. This
applies to motor housings as well when checking motor bearings.
The contact probe is also used in the same manner for investigating
fuel injectors and coil-over-shock suspension systems. Touch the tip
of the metal probe to the surface area being tested. Correct opera-
tion sounds one way, while malfunction sounds another way. You
will easily hear the difference.
Electrical Corona Discharge
At right is a typical application using the
Marksman II to detect possible electrical mal-
functions by listening to the electrical corona
discharge associated with power switches and
breaker boxes. As with all potentially danger-
ous situations, use caution. Use the hollow
air probe or use the receiver alone when
inspecting electrical conditions and always
keep a safe distance between the air probe tip and the metal
panel surfaces. The Marksman II is highly sensitive to picking
up voltage breakdowns. The resultant ultrasonic sound has been
described as sounding like "frying bacon."
Pressurized and Vacuum Leaks
Applications for pressurized type inspections are endless,
including compressed air or gas of any kind, air brake systems,
pipes/pipelines, steam systems, water lines, manifolds, and like-
wise all vacuum systems. Note: Ultrasonic detection relies on
detecting the sounds associated with the turbulence of the fluid or
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