910-269-EN, Rev. B, June 2011
Calibrating the EPOCH 1000 Series (Conventional UT Mode) 145
It is possible to use the auto-calibration on a single test block of known thickness.
You can use multiple back-wall echoes instead of coupling on both a thin step and
a thick step. In this scenario, leave the transducer coupled on the thin step, move
the gate over to one of the multiple back-wall echoes, and then enter the correct
sound path thickness (2, 3, 4, etc. multiple of the first back-wall echo) during the
velocity portion of the calibration.
9.5 Calibrating with a Dual Element Transducer
The sample dual element calibration described below is performed using an Olympus
transducer part number DHC711-RM with a frequency of 5.0
MHz and an element
diameter of 0.25
in. (6 mm).
The calibration requires a test block with two known thicknesses made from the
material being measured. Ideally, the two thicknesses should represent thicknesses
that are both below and above the expected thickness of the material to be inspected.
For this example, Olympus standard 5-step steel test block (part number 2214E) is
used. It has steps measuring 0.100
in., 0.200 in., 0.300 in., 0.400 in., and 0.500 in.
If the EPOCH 1000 Series is set to work in metric units, the calibration process is
exactly the same, except that the entries are in millimeters rather than inches.
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