Dakota Ultrasonics
14
altered by the user. Press and hold the
DOWN
arrow key while
powering up the
PX-7
to toggle the
LOC
feature on/off. Repeat
procedure to toggle on/off status.
Calibration
In order for the
PX-7
to make accurate measurements, it must be set to
the correct sound-velocity for the material being measured. Different types
of material have different inherent sound-velocities. For example, the
velocity of sound through steel is about 0.233 inches-per-microsecond,
versus that of aluminum, which is about 0.248 inches-per-microsecond. If
the tool is not set to the correct sound-velocity, all of the measurements the
tool makes will be erroneous by some fixed percentage. The one point
calibration is the simplest and most commonly used calibration procedure -
optimizing linearity over large ranges. The
PX-7
provides two simple
methods for setting the sound-velocity, described in the following pages.
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