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CHAPTER THIRTEEN
ADDITIONAL FEATURES
13.1 Quality/Correlation (Transducer Placement)
The auto correlation feature in the MAX II is a handy feature to assist the user with
returning the transducer back to the original position/location where it was during the
initial reference length measurement. Since the sound path is changing, in terms of
material consistency, returning the transducer to the same location increases the
accuracy of the MAX II, reducing what is referred to as the "placement error".
This feature is automatically activated after a reference length is measured and
stored, columns B-ZZ. The initial reference length waveform will be grayed out in the
background behind the active waveform after moving to one of the columns noted
above. The transducer should be placed back in the original estimated position as it
was during the initial length measurement. Rotate the transducer clockwise and
counter clockwise, making small movements of the transducer position until the
active wave matches the symmetry of original wave, and all the while watching the
quality indicator (Q) as it approaches 100% match. Once the wave symmetries, and
quality indicator, are as close to 100% as possible the user should slightly
increase/decrease the gain until the peaks of both waves are at the same level, or
amplitude. You'll notice the quality indicator will continue to approach 100% as the
gain is adjusted, though may never perfectly achieve the 100% level. However, the
primary objective is to return transducer to a position as close to the original location
as possible, and achieve a correlated match.
13.2 Lock System Zero
The system delay (zero) is stored with every custom setup file created and saved.
The value saved is whatever the current zero value setting is at that time, and can be
reviewed in the CAL menu. The lock feature has been added as an option to lock the
current zero setting in the CAL menu, not allowing the zero value stored in a setup
file to overwrite current value in the calibration menu.
135
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