DFX-7
Ultrasonic Flaw Detector
105
everything below the center line. The baseline is found at position
(A)
, and
considered zero dB. If
+RECT
was selected as the view, only the positive portion of
the waveform would be displayed. Equally, if the gate polarity was set to positive, as
in the diagram at
(C)
, it would also appear on the display. However, if it was set to
negative, would not appear on the display. In the example above, the gate is set to
positive and will detect on the positive going waveform cycles shown in the box
(B)
.
Toggle Polarity (+/-)
Note:
The screenshots above show where all the possible locations for polarity
selection are found in the
DFX-7
. For more information on the above, refer to
the sections on
VIEW
,
DAC
,
GT1
, &
GT2
.
1) Press the
MENU
key once to activate the menu items tab. Press the
MENU
key multiple times to tab right, and the
ESC
key multiple times to tab left,
