Extech Instruments
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TKG100_TKG150 Ultrasonic Thickness Gauge User Guide v2.8 11/13
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3 Calibrating the Gauge
Calibrating is the process of adjusting the gauge for a
specific material and transducer before testing material to
make sure that all measurements are accurate. You must
always calibrate before measuring material for standard
accuracy.
To measure a thickness of unknown material you need to
know the velocity of the sound in the unknown material.
To find the velocity of the sound you can use one of the
following methods:
Velocity calibration only
Velocity and zero calibration
Zero calibration only
Delay line calibration
Velocity Calibration Only
If you are working with a test piece of known thickness
but unknown material, then you can calibrate the 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 perform any calibration, first go to the measure mode
and press Menu/OK. Then select the Calibration option
from the Menu screen and press OK. The following
Calibration mode screen (or similar) should appear. To
