Dakota Ultrasonics DFX-8 plus MANUAL2 - Manual (Page 25)

DFX-8
Ultrasonic Thickness Gauge
21
DIGITS: Displays the digital thickness value using a large font size. This view is
useful when the DFX-8 is being used as a basic thickness gauge.
RF: Displays the actual waveform signal, much like an oscilloscope, from the
reflection of the opposite surface, pit, flaw, crack or void. This view shows both the
positive and negative peaks, and is often used to fine tune the scope settings, prior to
inspection.
RECT: Displays a half waveform signal, either positive or negative, from the
reflection of the opposite surface, pit, flaw, crack or void. The user can select the
polarity or “phase” displayed. This is typically determined by first using RF view to
select the most optimal polarity “phase”, to fine tune the scopes settings. The RECT
view is commonly used as the primary “flaw detection” view.
BSCAN: The Time Based B-Scan provides the user with a cross sectional view of
the material being tested. This mode is useful when there is concern regarding the
profile of the blind surface. This can also be a useful view when scanning for pits and
flaws.
Once the view has been selected according to the application requirements, the
Delay and Range of the screen will potentially need to be adjusted, if the view has
been set to RF or RECT. Alternatively, if BSCAN was selected, the B-Start and B-
Depth settings will need to be adjusted. These settings serve the same purpose,
with only differences in terminology. The Delay the same as B-Start, and the Range
is the same as B-Depth. Therefore, these items will be grouped together for the
duration of this manual, as follows: Delay (B-Start) and Range (B-Depth). Use the
following steps to adjust these settings directly from the measurement screen as
follows:
Note: The Delay (B-Start) and Range (B-Depth) are also used to adjust the
parameters of Scan Bar.
Adjusting Delay (B-Start) & Range (B-DEPTH)