910-269-EN, Rev. B, June 2011
Calibrating the EPOCH 1000 Series (Conventional UT Mode) 137
9.3 Calibrating with a Straight Beam Transducer
The sample straight beam calibration described below is performed using an
Olympus transducer part number A109S-RM, with a frequency of 5.0
MHz and an
element diameter of 0.50
in. (13 mm).
The calibration requires a test block with two known thicknesses made from the
material to be measured. Ideally, the two thicknesses should represent thicknesses
that are both below and above the expected thickness of the material being inspected.
For this example, Olympus standard 5-step steel test block (part number 2214E) is
used. The steps measure 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.
To calibrate using a straight-beam transducer
1. Follow the initial setup procedure outlined in section 9.1 on page 134.
2. Connect the transducer to an appropriate cable and then connect the cable to
either of the conventional transducer connectors at the top of the instrument.
3. Select 1/5 > Auto CAL > CAL Mode = Thickness.
4. Couple the transducer to the thin calibration block step. For this example, the
transducer is coupled to the 0.200
in. step.
Depending on the frequency of the contact transducer being used, it might be
impossible to obtain a proper reading on very thin material.
5. Use the [GATE] key to position gate 1 so that the first back-wall echo from the
known thickness step exceeds the gate threshold.
6. Press [GAIN], and then adjust the gain value so that the echo amplitude is at
approximately 80
%.
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