Page ii
PocketMIKE Operating Manual
More specific information about operator training, qualification,
certification, and test specifications is available from various technical
societies, industry groups, and government agencies.
Testing Limitations
In ultrasonic testing, information is obtained only from within the limits
of the sound beam. Operators must exercise great caution in making
inferences about the test material outside the limits of the sound beam.
For example, when testing large materials it may be impossible or
impractical to inspect the entire test piece. When a less-than-complete
inspection is to be performed, the operator must be shown the specific
areas to inspect. Inferences about the condition of areas not inspected,
based on data from the evaluated areas, should only be attempted by
personnel fully qualified and trained in applicable standards of statisti-
cal evaluation. In particular, materials subject to erosion or corrosion, in
which conditions can vary significantly in any given area, should only
be evaluated by fully trained and experienced operators.
Sound beams reflect from the first interior surface encountered. Be-
cause of part geometry and overlapped flaws or overlapped surfaces,
thickness gauges may measure the distance to an internal flaw rather
than to the back wall of the material. Operators must take steps to
ensure that the entire thickness of the test material is being examined.
Ultrasonic Thickness Measurement
Critical Operating Procedures
The following operating procedures must be observed by all users of
ultrasonic thickness gauges in order to minimize errors in test results.
1. Calibration of Sound Velocity
The principle of operation of an ultrasonic thickness gauge is that the
instrument measures the time of flight of an ultrasonic pulse through
the test piece and multiplies this time by the sound velocity of the
material. Thickness measuring error is minimized by ensuring that the
sound velocity to which the instrument is calibrated is the sound
Page ii
PocketMIKE Operating Manual
More specific information about operator training, qualification,
certification, and test specifications is available from various technical
societies, industry groups, and government agencies.
Testing Limitations
In ultrasonic testing, information is obtained only from within the limits
of the sound beam. Operators must exercise great caution in making
inferences about the test material outside the limits of the sound beam.
For example, when testing large materials it may be impossible or
impractical to inspect the entire test piece. When a less-than-complete
inspection is to be performed, the operator must be shown the specific
areas to inspect. Inferences about the condition of areas not inspected,
based on data from the evaluated areas, should only be attempted by
personnel fully qualified and trained in applicable standards of statisti-
cal evaluation. In particular, materials subject to erosion or corrosion, in
which conditions can vary significantly in any given area, should only
be evaluated by fully trained and experienced operators.
Sound beams reflect from the first interior surface encountered. Be-
cause of part geometry and overlapped flaws or overlapped surfaces,
thickness gauges may measure the distance to an internal flaw rather
than to the back wall of the material. Operators must take steps to
ensure that the entire thickness of the test material is being examined.
Ultrasonic Thickness Measurement
Critical Operating Procedures
The following operating procedures must be observed by all users of
ultrasonic thickness gauges in order to minimize errors in test results.
1. Calibration of Sound Velocity
The principle of operation of an ultrasonic thickness gauge is that the
instrument measures the time of flight of an ultrasonic pulse through
the test piece and multiplies this time by the sound velocity of the
material. Thickness measuring error is minimized by ensuring that the
sound velocity to which the instrument is calibrated is the sound
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