Dakota Ultrasonics DFX-8 plus MANUAL1 - Manual (Page 51)

DFX-8 Series Ultrasonic Flaw Detectors
47
7) Press the OK key to calculate the velocity and return to the menu screen, or
ESC to cancel the one point calibration.
8) Finally, press the MEAS key to return to the Measurement screen.
Apply a drop of couplant on the transducer and place the transducer in steady
contact with the 4” calibration standard. Be sure that the reading is stable and
the repeatability indicator, in the top left corner of the display, is fully lit and
stable. Also, be sure there is sufficient signal amplitude in order to avoid ‘peak
jumping’ or missing the first cycle.
Adjusting the Gate
1) Press the MEAS key once to activate the measure menu items. Press the
MEAS key multiple times to move right and the ESC key multiple times to
move left, until the GATE1 cell is highlighted. Alternatively, press the
LEFT and RIGHT arrow keys multiple times using the left button wheel.
2) Press the LEFT and RIGHT arrow keys on the right button wheel to
move the gate over the waveform to be measured, as demonstrated in the
screen shot above.
Note: In order to trigger on a signal, the waveform must be inside the
boundaries of the gate.
Calibrating the Second Point