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Dakota Ultrasonics DFX-7 plus MANUAL1 User Manual

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DFX-7 Ultrasonic Flaw Detector

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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 until

the TUNE menu is highlighted and displaying the submenu items.

2) Use the UP and DOWN arrow keys to scroll through the sub menu items

until DETECT MODE is highlighted.

3) Use the LEFT and RIGHT arrow keys to scroll the DETECT options.

4) Once the DETECT is displayed, press the MEAS key to return to the

measurement screen.

11.17 Polarity

The DFX-7 has a number of features and views that offer selectable polarity. The
important thing to note is the polarity view is entirely different than the polarity
selection of a gate. If a polarity view of +RECT is selected, only the positive portion
of the waveform will be shown on the screen. If a positive polarity is then selected for
GT1, not only will the gate be displayed on the screen, it will only detect on the
positive going cycles of the waveform. Polarity is selectable according to the VIEW,
GT1, GT2, and DAC. Again, view corresponds only to what portion of the waveform
is displayed, positive or negative, and the other three options are primarily associated
with where the detect occurs. Finally, if the view is set to RF, the entire waveform
cycle will be displayed, both positive and negative. Refer to the diagram below:

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

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