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CHAPTER ONE
INTRODUCTION
The Dakota Ultrasonics model CMX is an ultrasonic thickness gauge that measures
with extreme versatility. It has the ability to simultaneously measure coatings and
material thicknesses while maintaining the ability to still locate pits, flaws and defects
in the material. Based on the same operating principles as SONAR, the CMX is
capable of measuring the thickness of various materials with accuracy as high as ±
0.001 inches, or ± 0.01 millimeters. The principle advantage of ultrasonic
measurement over traditional methods is that ultrasonic measurements can be
performed with access to only one side of the material being measured.
Dakota Ultrasonics maintains a customer support resource in order to assist users
with questions or difficulties not covered in this manual. Customer support may be
reached at any of the following:
• Dakota Ultrasonics Corporation,
1500 Green Hills Road, #107
Scotts Valley, CA 95066 USA
• Telephone: (831) 431-9722
• Facsimile: (831) 431-9723
• http://www.dakotaultrasonics.com
1.1 Disclaimer
Inherent in ultrasonic thickness measurement is the possibility that the instrument will
use the second rather than the first echo from the back surface of the material being
measured. This may result in a thickness reading that is TWICE what it should be.
Responsibility for proper use of the instrument and recognition of this phenomenon
rest solely with the user of the instrument. Other errors may occur from measuring
coated materials where the coating is insufficiently bonded to the material surface.
Irregular and inaccurate readings may result. Again, the user is responsible for
proper use and interpretation of the measurements acquired.