Calibrating With The E110-Sb Emat Transducer - Olympus 38DL PLUS User Manual

DMTA-10004-01EN, Rev. D, November 2016
6.2

Calibrating with the E110-SB EMAT Transducer

Calibration is the adjustment of the gage so that it measures accurately on a particular
material. The default velocity and zero offset for the E110-SB EMAT transducer are
designed to provide a good estimate of the ferrous metal thickness underneath an
external oxide scale coating.
To achieve the best accuracy, use calibration samples with external oxide scale made
from the material to be tested. These samples should have a metal of known thickness
(not including external oxide scale) and should represent the minimum and
maximum thickness of your measurement range.
The calibration procedure is the same as for a standard transducer except that you do
not need to use couplant to couple the transducer to the material. Refer to
"Calibrating the Instrument" on page 67 for the calibration procedure.
NOTE
The EMAT transducer generates shear wave sound energy. Consequently, the velocity
calculated by the gage is the shear sound velocity of the material.
Using EMAT Transducers 89