910-269-EN, Rev. B, June 2011
Calibrating the EPOCH 1000 Series (Conventional UT Mode) 151
7. Select 2/5 > Gate Setup > G2 Tracks = G1 so that gate 2 tracks gate 1.
For more information on gate tracking activation, see section 6.6 on page 116.
8. Select 1/5 > Auto CAL > CAL Mode = G2 - G1.
9. Couple the transducer to the calibration block.
For this example, the transducer is coupled to the 0.300 in. step.
10. Use the [GATE] key to position gate 1 so that the first back-wall echo from the
known thickness step exceeds the gate threshold.
11. Use the [GATE] key to position the separation of gate 1 and gate 2 so that the
second back-wall echo from the known thickness step exceeds the gate
2
threshold.
12. Adjust the gain so that neither signal is saturated, and so that the echo amplitude
in gate
2 is above 50 %.
A thickness measurement reading appears in large text above the A-scan, labeled
G2-G1.
In attenuating materials, it might be impossible to bring the second indication
above 50 % while avoiding saturation of the first signal. If this is true, try using
the edge detection mode instead of the peak detection to ensure accurate
measurements (see section 6.4 on page 113 for details).
Ensure that gate 1 and gate 2 are capturing successive back-wall echoes, not
multiple echoes from the end of the delay line tip.
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