Dakota Ultrasonics PVX - Manual (Page 50)

Dakota Ultrasonics
46
Rectified View
Rectified
The rectified A-Scan mode shows half of the waveform. Either the positive or
negative peaks are displayed, depending on the polarity selected. This is the
preferred display view for flaw detection applications.
It’s important to note that a measurement must fall inside the viewable display range
in order to see the waveform. However, even if the waveform is outside of the
viewable area, a measurement can be taken and viewed on the digital readout. If the
waveform is outside of the display range, you can manually change the range by
adjusting the Delay and Width values, or you can use the Auto Find feature located
in the UTIL menu in the tabbed menu items. Refer to page 72 for additional
information on the Auto Find feature.
The following is a list of the viewable features on the display:
A) Stability of Reading Indicator – Indicates the stability of the return echo on a
scale of 1 to 6 – the solid bars displayed in the figure above indicate a repeatable
signal. If the PVX is displaying a reading from memory, the repeatability indicator
will be replaced by the text “MEM”.
B) Battery life indicator – Fully charged batteries will appear filled in solid. Note:
The diagram shows the batteries at approximately 50%.
C) Thickness reading – Digital readout of thickness (inches or millimeters).
D) Detect Indicator – The broken vertical line displays the zero crossing (flank)
detection point on the waveform where the measurement has been obtained.
Notice that the digital thickness readout is the same as the location of the detect
indicator according to the measurements labels F, also in the diagram.