4
27MG — Getting Started Guide
The 27MG is now ready to take thickness readings for the test block supplied with the
instrument, using the default velocity.
To Calibrate the Instrument
The 27MG must be calibrated to ensure the thickness measurement accuracy for the transducer and
the tested material being used. This is achieved by performing the velocity and zero calibrations on
two known thicknesses of a test block (such as a five-step test block, as shown below) made out of the
same material as the inspected parts.
1.
Place couplant on the surface of the thick sample of the test block.
2.
Couple the transducer on the thick sample of the test block.
3.
Press
[Cal Vel]
or
[Cal
]
.
4.
Once the thickness reading is stable, press
[ENTER]
or
[
]
.
5.
Use the arrow keys to enter the known thickness.
6.
Press
[Cal Zero]
or
[Cal
Ø
]
.
7.
Place couplant on the surface of the thin sample of the test block.
8.
Couple the transducer on the thin sample of the test block.
9.
Once the thickness reading is stable, press
[ENTER]
or
[
].
10. Use the arrow keys to enter the known thickness.
11. Press
[MEAS]
.
For more information about calibration, and about selecting the correct transducer for a specific
application, refer to the
27MG Ultrasonic Thickness Gage — User’s Manual
, or contact Olympus.
Transducer on a
thick sample
Transducer on a
thin sample
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