DFX-7
Ultrasonic Flaw Detector
83
The diagram above is an
RF
view, showing both the positive and negative going
cycles for purposes of explanation. Notice the +/- positions in the diagram. The
positive phase is everything above the horizontal center line, and the negative
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 (+/-)
Содержание DFX-7
Страница 35: ...Dakota Ultrasonics 34 Note Sets where the detection will occur on the negative or positive going echoes...
Страница 219: ...Dakota Ultrasonics 82 10 Finally press the MEAS key to return to the measurement screen and begin taking readings...
Страница 308: ...171 APPENDIX B SETUP LIBRARY Num Name Comment 1 Gn AGC Velocity 1 Enter Custom Name 2 3 4 5 6...
