Checkline DFX-7 - Manual (Page 56)

Dakota Ultrasonics
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all of the measurements the gauge makes will be erroneous by some fixed
percentage.
The One Point calibration is the simplest and most commonly used calibration
method - optimizing linearity over large ranges. The Two Point calibration allows for
greater accuracy over small ranges by calculating the probe zero and velocity. The
DFX-7
provides four simple methods for setting the sound-velocity outlined below:
Known Velocity
If the material velocity is known, the user may wish to simply enter the velocity
number into the DFX-7, rather than have the DFX-7 calculate the velocity value using
a known thickness on a material sample. The steps for entering the velocity are
outlined below:
Using a Known Material Velocity
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.
2) Use the UP and DOWN arrow keys to scroll through the sub menu items
until VELOCITY is highlighted.