3. Measuring Thickness
3.1 Instrument Calibration
Before using PM-5 series, set the sound velocity of the material to be
measured, without calibrating the instrument and probe, the thickness
of the work-piece can be measured directly.When the sound velocity of
the material to be measured is unknown, calibration can be selected to
find out the sound velocity of the material to be measured, which is very
important.The calibration function is divided into two types:
One-point calibration: use the same velocity and curvature of standard
test block as the material being tested to calibration.
Manual setting the velocity: for the known velocity of the material, e.g.
The velocity of the steel is 5900/s, then input the velocity manual.
3.1.1 One Point Calibration
When the sound velocity of the material to be measured is unknown,
sound velocity measurement must be made before measuring the
thickness.
①
Prepare a test block with the same composition as the object to be
measured, and its surface must be suitable for measurement.
②
Measure the thickness of the test block with a vernier caliper.
③
Coat the couplant on the surface of the test block.
④
Refer to Figure 3.1 for the measurement process
3.1 One point Calibration Steps
3.1.2 Velocity Adjusting Steps
When the sound velocity of the material to be measured is known, the
value of sound velocity can be adjusted manually before measurement,
The method is as follows (Figure 3.2)
3.2 Specification Adjusting Steps
7
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