Cygnus M2-DIVE - Interpreting A-Scan in Echo-Echo Mode; Evaluating Echo-Echo Signal Quality

Cygnus DIVE Operating Manual M2-DIVE-M-ENG_Iss5.docx
Page 50 of 118
12. Interpreting the A-Scan Display in Echo-
Echo Mode
Just like Single Echo mode when measuring using Echo-Echo mode
the A-Scan display can provide valuable information on the quality
and reliability of and thickness measurement, and when no
thickness measurement is given it can help the user understand
why not.
Good Echo
-
Echo Signal.
This A-Scan shows a clear 1
st
and 2
nd
echo and the gauge has correctly
measured 12.1 mm.
The echo-echo measurement is
indicated by the solid Yellow which
starts at the 1
st
echo and ends at the
2
nd
echo.
No Measurement.
The position of the 2
nd
echo is clearly
less than 2 x 1
st
echo position – the
gauge will not give a thickness
measurement in this situation.
Try moving to a different location or
rotating the probe.
Poor Signal
–
Noisy.
The gauge has been unable to locate
a suitable 1
st
and 2
nd
echo in the
correct position. The signal is noisy
(very corroded metal).
Try moving to a different location or
rotating the probe.