ECHO Series Ultrasonic Thickness Gages
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3 Calibrating the Gage
Calibrating is the process of adjusting the gage for a specific material and transducer
before testing material to ensure that all of the measurements are accurate. You must
always calibrate before measuring material for standard accuracy.
Velocity Calibration Only
If you are working with a test piece of known thickness but unknown material, then you
can calibrate velocity of the sound in the unknown material by measuring the time of
flight from main-bang to the first back echo. By using the known thickness you can
calculate velocity of the sound for the unknown material.
To preform a Velocity calibration only, follow these steps:
1. Power on the gage.
2. Use the up and down arrow keys to select your transducer.
3. Press F1 – Menu key.
4. Use the up and down arrow keys to select the Calibration option.
5. Press the MENU/OK key.
6. Verify your transducer selection and press the MENU/OK key.
To proceed with Velocity calibration, follow the instructions below:
1. Place couplant on the surface of a 5-step test block.
2. Couple the transducer to the material. A similar screen to the one shown below
will appear:
Cal screen
3. While measuring the thickest step, select F3 - VEL key.
4. After pressing the F3 key, you can take the transducer off the test block. If the
displayed measurement is different than the known value of the step, use the up or
down arrow key to adjust the displayed value to the known value of the step.
5. Press the MENU/OK key to perform the calibration.
The unit will briefly display the calibrated velocity value in the top of the screen and then
return to Measure mode.
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