Tracer TP-9367 Marksman II AM12002 - Manual (Page 12)

12
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 operation 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
malfunctions by listening to the electrical
corona discharge associated with power
switches and breaker boxes. As with all
potentially dangerous 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
likewise all vacuum systems. Note: Ultrasonic detection relies on
detecting the sounds associated with the turbulence of the fluid or