Spectronics Corporation 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
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 mal-
functions by listening to the electrical corona
discharge associated with power switches and
As with all potentially
breaker boxes.
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 i s highly sensitive to pick-
ing 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
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