Epson USN 52L, Operating Manual, Page: 77 / 207

5-32 Issue 05, 02/00 Krautkramer USN 52R/USN 52L
DAC mode
– Peak the echo of an assumed flaw and shift the gate
so that the echo data are evaluated.
– You can read the sound path in the measurement line
and, in addition with angle-beam probes, the
(reduced) projection distance and the flaw depth.
You can immediately see from the A-scan whether or
not the echo has to be recorded.
The recording threshold violations in dB can also be
easily determined:
– Adjust the gate threshold exactly to the point of
intersection of the curve with the assumed flaw
indication.
The enlarged reading in the A-scan indicates the
amount of dB by which the flaw echo exceeds the
curve, i.e. the amount by which the echo indication
exceeds the reference echo.
Operation
Echo evaluation with DAC/TCG
5-32 Issue 05, 02/00 Krautkramer USN 52R/USN 52L
DAC mode
– Peak the echo of an assumed flaw and shift the gate
so that the echo data are evaluated.
– You can read the sound path in the measurement line
and, in addition with angle-beam probes, the
(reduced) projection distance and the flaw depth.
You can immediately see from the A-scan whether or
not the echo has to be recorded.
The recording threshold violations in dB can also be
easily determined:
– Adjust the gate threshold exactly to the point of
intersection of the curve with the assumed flaw
indication.
The enlarged reading in the A-scan indicates the
amount of dB by which the flaw echo exceeds the
curve, i.e. the amount by which the echo indication
exceeds the reference echo.
Operation
Echo evaluation with DAC/TCG