DFX-7
Ultrasonic Flaw Detector
85
11.2 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
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
PRB
menu is highlighted and displaying the submenu items.
2) Use the
UP
and
DOWN
arrow keys to scroll through the sub menu items
until
MAX PRF
is highlighted.
3) Use the
LEFT
and
RIGHT
arrow keys to scroll the
PRF
options.
