Dakota Ultrasonics UMX-2 - Manual (Page 37)

Dakota Ultrasonics
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When? The low settings may be necessary for noisy or granular cast materials. How
do I know when to lower the gain? If the reading becomes sporadic and won’t settle
down or resolve on a thickness value, the user can assume that the material is either
very noisy aluminum, or g ranular cast iron. This would be a good time to change the
UMX-2 to lower gain setting and see if the reading settles down and become stable.
How do I know when to increase the gain? Often times the user will be trying to
measure a material that is hard to penetrate or pass sound through. This may be
due to the material type, or overall thickness of the material. When a material is hard
to pass sound through because of the thickness or general make-up, it would be a
good time to consider switching the UMX-2 into a higher gain setting. Another
example might be the need to increase overall sensitivity for locating fine pits or
flaws. In any case, the selectable gain settings offer the user some additional options
to resolve and overcome application issues.
The procedures to adjust the Gain are outlined below:
Adjusting the Gain
1) Press and hold the single UMX-2 button, located on the top end cap, until
the top level menu options begin scrolling on the alpha display. Once this
occurs, the button can now be released. The menu options will scroll one to
the next in a time delayed sequence, and will display all the menu options in
a continuous loop.
2) When GAIN is displayed, immediately press and release the button to enter
the sub menu options. Again, the options will begin scrolling in a continuous
loop (VLOW, LOW, MED, HIGH, VHIGH).