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910-269-EN, Rev. B, June 2011
150 Chapter 9
In Echo-to-echo mode, the calibration requires a test block with only one known
thickness, made from the material to be measured. Ideally, the thickness measurement
is very close to the expected thickness of the material to be inspected. Echo-to-echo
mode measures the distance between two actual indications, one representing the
measurement start point and one representing the measurement end point. This
eliminates the need for zero offset calibration, since the effects that cause a zero offset
are accounted for by gating the start-point indication. Therefore, in an echo-to-echo
mode calibration, the instrument must only calibrate for material velocity to provide
accurate readings.
For this example, we are using Olympus standard 5-step steel-test block, part number
2214E. 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 in echo-to-echo mode using a delay line 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.
With a zero offset of 0.000 µs, the excitation pulse (or main bang) should appear
on the left side of the screen.
3.
Choose
1/5 > Basic > Zero
, and then increase the value until the excitation pulse
moves off the left side of the screen and the interface echo from the end of the
delay line tip appears on the screen.
4.
Verify that the echo represents the end of the delay by tapping your finger on the
end of the couplant-coated delay line.
This dampens the signal and the echo should jump up and down on the screen.
5.
Choose
1/5 > Basic > Zero
, and then increase the value to move this echo to the left
side of the screen so that it is barely visible.
At least two gates must be active to acquire an echo-to-echo measurement. Gate
Tracking must also be active.
6.
Activate gate 1 and gate 2, by selecting
2/5 > Gate 1 > Status = On
and
2/5 >
Gate 2 > Status = On
to use them as measurement gates.
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