Dakota Ultrasonics DFX-8 plus MANUAL1 - Manual (Page 93)

DFX-8 Series Ultrasonic Flaw Detectors
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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.
Alternatively, press the LEFT and RIGHT arrow keys multiple times
using the left button wheel.
2) Use the UP and DOWN arrow keys multiple times on the left button
wheel to scroll through the sub menu items until PULSE is highlighted.
3) Use the LEFT and RIGHT arrow keys on the right button wheel to scroll
the Pulse options.
4) Once the Pulse is displayed, press the MEAS key to return to the
measurement screen.
11.2 Pulse Repetition Frequency (PRF)
The DFX-8 is equipped an adjustable pulse repetition rate, with adjustable settings of
8, 16, 32, 66, 125, 250, and 333Hz. The primary purpose is to control how fast the
pulser is firing. The repetition rate is tied into the alarm LEDS. Therefore, when
scanning at higher speeds, a higher repetition rate will make the alarm trigger more
responsive. It’s important to note that since the screen has a maximum refresh rate
of 60Hz, or draws at 60 times a second, any PRF settings over this maximum will not
be visible on the display. In fact, the human eye has a response rate of less than
60Hz.
The PRF setting will automatically be overridden according to the range set by the
user. Long range settings will slow the PRF down automatically. Slower PRF
settings will save on battery life. Therefore, if your current application doesn’t call for
fast scanning speeds, you can save battery life by selecting a slower PRF. The
procedure to change the MAX PRF setting is outlined below:
For quick access and editing, refer to navigating the Hot Menus page 22.
Setting the Max PRF