Dakota MAX II, Operation Manual

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Dakota Ultrasonics
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Echo-Echo Mode (E-E)
Multi echo mode that measures from the first to the second return echo, and blocks
the initial pulse. This mode can slightly improve user transducer placement errors,
coated fasteners, and coated fasteners with changes in temperature. Because two
return echoes are required, generally not suitable for long fasteners applications.
Echo-Echo Verify Mode (E-EV)
Multi echo mode that measures from the first to the second return echo, and from the
second to the third return echo, then compares the measurements to “verify” they are
the same. Like the E-E mode, can slightly improve transducer placement errors,
coated fasteners, and coated fasteners with changes in temperature. Because three
return echoes are required, generally only used for shorter fastener applications.