Dakota Ultrasonics DFX-7 plus MANUAL2 - Manual (Page 60)

Dakota Ultrasonics
56
the job. For example, if the measurement range was .080” (2.03mm) to .250”
(6.35mm), the user would perform a one point calibration on a known thickness
sample close to .250” (6.35mm), followed by a two point calibration close to .080”
(2.03mm). When a two point calibration is performed, the DFX-7 calculates the zero
and the velocity. The following steps outline this procedure:
Two Point Calibration
1) Physically measure an exact sample of the material or a location directly on
the material to be measured using a set of calipers or a digital micrometer.
2) Apply a drop of couplant on the transducer and place the transducer in
steady contact with the sample or actual test material. Be sure that the
reading is stable and the repeatability indicator, in the top left corner of the
display, is fully lit and stable. 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.
3) Use the UP and DOWN arrow keys to scroll through the sub menu items
until MATL 2PT is highlighted.