Checkline DFX-7 - Manual (Page 76)

Dakota Ultrasonics
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6) Press the LEFT and RIGHT arrow keys to scroll the digit locations.
7) Repeat steps 5 & 6 until the velocity value is correctly displayed.
8) Press the OK key to set the velocity and return to the menu screen, or ESC
to cancel entering the velocity.
9) Finally, press the MEAS key to return to the measurement screen.
10.2 Zero
The DFX-7 has a feature to manually adjust the electronic zero. This feature used in
conjunction with manually adjusting the velocity, are the primary features necessary
to perform a ‘crude’ manual screen calibration. The procedure for adjusting the zero
is listed below:
Adjusting Zero
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 CAL menu is highlighted and displaying the submenu items.