Dakota Ultrasonics PR-82 - Manual (Page 21)

PR-8
2
Sonic Tester
17
Scan Mode
While the PR-8
2
excels at making single point measurements, it is
sometimes desirable to examine a larger region, searching for the thinnest
point. The PR-8
2
includes a feature, called Scan Mode, which allows it to
do just that.
In normal operation, the PR-8
2
performs and displays four
measurements every second, which is quite adequate for single
measurements. In Scan Mode, however, the tool performs sixteen
measurements every second, but does not display them. While the
transducer is in contact with the material being measured, the PR-8
2
is
keeping track of the lowest measurement it finds. The transducer may be
"scrubbed" across a surface, and any brief interruptions in the signal will be
ignored. When the transducer loses contact with the surface for more than
a second, the PR-8
2
will display the smallest measurement it found.
When the PR-8
2
is not in calibration mode, press the UP arrow key to
turn Scan Mode on and off. A brief message will appear in the display
confirming the operation. While scanning, the display will show a
moving series of dashes instead of a thickness value. When the
transducer is removed from the material being scanned, the PR-8
2
will
(after a brief pause) display the smallest measurement it found.