Dakota Ultrasonics PVX - Manual (Page 15)

PVX Precision Visual Thickness Gauge
11
B-SCAN DIGITS
In the upper left corner of each of the mode photos above, is the repeatability
indicator. The repeatability indicator is represented by six vertical bars and
represents how repeatable the measurements are. In regular measurement mode,
the PVX makes 4 measurements a second. In scan mode, the PVX makes 32
measurements a second. When the PVX is idle, only the left vertical bar and the
underline will be displayed. However, when the PVX is making a measurement, five
or six of the bars should be displayed on the repeatability indicator. If fewer than five
bars are showing, the PVX is having difficulty achieving a stable measurement and
the thickness value displayed is potentially be unstable. Another thing to note is the
vertical broken line in the RF and RECTIFIED photos above. This line represents the
actual point of detection. The PVX uses a zero crossing or flank detection method,
and presents the actual point of measurement on the display.