Checkline TI-CMXDL - Manual (Page 27)

Performing an Auto Probe Zero (Off Block)
1. Be sure all couplant has been
removed from the face of the
transducer.
2. Press the OK key to perform the
automatic probe zero, or ESC key
to cancel the zero operation.
3. The screens illustrated at right will
be briefly displayed followed by the
main measurement screen. The
CMX is ready to be calibrated.
Performing a Manual Probe Zero (On Block)
NOTE: When the zero probe option is set to manual, the probe zero disk (battery cap)
located on the top of the gauge will be used as a zero standard and the warning screen
illustrated above will be displayed.
1. Press the OK or ESC keys to enter the main measurement screen and begin the manu
zero process.
2. Apply a drop of couplant on the transducer and place the transducer in steady contac
with the probe zero disk and obtain a steady reading.
3. 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.
4. Press the UP and DOWN arrow keys
to scroll through the sub menu items
until ZERO PROBE is highlighted.
5. Press the ENTER key to display the
confirmation screen.
6. If a coating transducer was identified
use the UP and DOWN arrow keys to
toggle coating on/off.
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Coating Probe
Identified Coating Probe
Not Identified
Coating Probe
Identified Coating Probe
Not Identified
Coating Probe
Identified Coating Probe
Not Identified
2. Apply a drop of couplant on a piece of metal and place the coating sample on the metal
over the couplant. Apply a drop of couplant on the transducer and place the transducer
in steady contact with the coating and 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 velocity and return to the menu
screen, or ESC to cancel the coating 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 thickness. If the
thickness is not correct, repeat the steps above.
9.4 Introduction to Coating Measurement (CT)
In the previous sections we’ve discussed how to setup and use the coating feature for use
in conjunction with material thickness and flaw and pit detection. The TI-CMXDL also has
the capability to be used for general coating measurements. This measurement mode is
called Coating (CT) and can be enabled using the same methods as described in a previous
section above.
When the Coating Only (CT) mode is enabled, a two point calibration on the coating
samples must be performed. This is to ensure linearity over the coating measurement range
will be achieved. Important note: If coating measurements will be made with the coating
applied to a metal surface, the calibration must be done in the same manner, with the
samples coupled to a metal surface. However, if the coating will be measured as a stand
alone material, the calibration must be performed the same way.
9.5 Two Point Coating Calibration (CT)
Known Thickness
The following section will demonstrate the two point coating calibration procedure. This
example demonstrates a coating thickness range of .040” - .120” ( 1 – 3 mm) as follows:
NOTE: It’s always handy to carry a set of mechanical calipers to use in conjunction with
the TI-CMXDL for calibration in the field:
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