Checkline TI-CMXDL - Manual (Page 10)

Known Coating Thickness
When the exact velocity of a coating is unknown, the user has
the option of performing a one point calibration on a sample of
the coating with a known thickness to determine the sound
velocity. It would be very handy to carry a set of mechanical
calipers to use in conjunction with the TI-CMDL for calibration
in the field:
1. Physically measure a location on a coating sample using a set
of calipers or a digital micrometer.
IMPORTANT NOTE: In PECT (pulse-echo coating) mode, the
coating sample must be coupled to metal in order to calibrate
successfully. Simply place a drop of couplant on a piece of
metal, lay the coating sample over the couplant on the metal and
proceed to step 2.
2. Apply a drop of couplant on the transducer and place the transducer in steady contact
with the coating (on metal) 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 COATING 1PT is highlighted.
4. Press the ENTER key to display the Digits Edit Box.
5. Press the UP and DOWN arrow keys to scroll the
highlighted value.
6. Press the LEFT and RIGHT arrow keys to scroll the digit
locations.
7. Repeat steps 5 & 6 until the known thickness value is
correctly displayed.
8. Press the OK key to calculate the coating velocity and return
to the menu screen, or ESC to cancel the one point calibration.
9. Finally, press the MEAS key to return to the measurement screen and begin taking
readings.
NOTE: CHECK YOUR CALIBRATION! Place the transducer back on the calibration
point. The coating thickness reading should now match the known coating thickness
sample. If the thickness is not correct, repeat the steps above.
-10-
11.8 Closing an active File - Close
A user might not have a current requirement to store measurements, but a file is currentl
open or active and needs to be closed. The following procedures outline how to close an
open or active file:
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 DATA menu
is highlighted and displaying the submenu items.
2. Use the UP and DOWN arrow keys to scroll through the
submenu items until CLOSE is highlighted.
3. Press the ENTER key to close the active file.
NOTE: Following the key press, the CLOSE text will be grayed
out indicating the file has been close and is no longer active.
-59-