Olympus 38DL PLUS User Manual

DMTA-10004-01EN, Rev. D, November 2016
Using EMAT Transducers 89
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.
The EMAT transducer generates shear wave sound energy. Consequently, the velocity
calculated by the gage is the shear sound velocity of the material.
NOTE

Olympus 38DL PLUS Specifications

General

Operating Temperature	-10 °C to 50 °C (14 °F to 122 °F)
Data Logger	Yes
Interface	USB, RS-232
Thickness Range	0.08 mm to 635 mm (0.003 in. to 25 in.) depending on material and transducer
Display	Backlit LCD
Battery Type	Three alkaline or NiMH AA cells
Pulser	Adjustable square wave pulser
Receiver Bandwidth	0.5 MHz to 20 MHz
Languages	English, French, German, Spanish, Italian, Russian, Japanese, Chinese
Resolution	0.001 mm or 0.0001 in.
Transducer Frequency	2 MHz to 30 MHz
Material	Plastic housing