DMTA-10004-01EN, Rev. D, November 2016
Custom Setups for Single Element Transducers
227
Mode 3
Measures the time of flight between one back-wall echo to the next back-wall echo
using a delay line or an immersion transducer (see Figure 13-5 on page 227).
Figure 13‑5 Mode 3 detection example
Refer to “Echo Window” on page 233 for information on the modes in relation with
the echo window.
13.4 First Peak
With single element transducers, the 38DL PLUS normally detects peaks on either the
highest positive or highest negative peak of the RF waveform. This feature works well
for most precision thickness applications.
This normal peak detection can be unstable for applications in which the back-wall
echo is irregular and contains several negative or positive peaks that are close in
amplitude. In these cases, the thickness reading can fluctuate as the gage switches
detection from one peak to another. This can happen for example in applications
Interface echo
Second back-wall echo
First back-wall echo
Detection bar
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