Checkline DFX-7 - Manual (Page 93)

DFX-7 Ultrasonic Flaw Detector
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10.15 Pulse Repetition Frequency (PRF)
The DFX-7 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 120Hz, or draws at 120 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:
Setting the Max PRF
5) 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 PRB menu is highlighted and displaying the submenu items.
6) Use the UP and DOWN arrow keys to scroll through the sub menu items
until MAX PRF is highlighted.
7) Use the LEFT and RIGHT arrow keys to scroll the PRF options.