910-269-EN, Rev. B, June 2011
Calibrating the EPOCH 1000 Series (Conventional UT Mode) 157
9.7.3 Calibrating for Distance
The ASTM E-164 IIW Type I block, which has a crescent cut in the side, produces
echoes at 4
in. (100 mm) and 9 in. (225 mm) on the screen, which are used for sound
path distance calibration. The following procedure uses the Olympus IIW Type
I
carbon steel calibration block, part number TB7541-1. For information on distance
calibration with other standard calibration blocks, see section
9.10 on page 168.
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 for sound path distance
1. Choose 1/5 > Basic > Range, and then set the value to 12.00 in. (300 mm).
This should ensure that the echoes from the block are visible on screen.
2. Select 1/5 > Auto CAL > CAL Mode = Soundpath.
3. Couple the transducer to the calibration block so that the BIP is directly over the
0
mark on the ASTM test block. Do not move the transducer from this point
during the distance calibration step.
4. Use the [GATE] key to position gate 1 so that the first reflection from the arc of the
block is exceeding the gate threshold.
This reflection should be close to 4 in. (100 mm).
5. Press [GAIN], and then adjust the gain setting so that the echo amplitude is at
approximately 80
%.
A thickness measurement reading appears in large text above the A-scan.
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