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Use the Auto Find function - see 'Auto Find (CG70ABDL only)" on page 14.
Note: Even if the waveform is outside of the viewable range of the display, a measurement can be
taken and viewed using the DIGITS view.
5.6.1 DELAY AND WIDTH
The DELAY is the thickness value from which the A-Scan display starts on the left of the screen.
The WIDTH is used to adjust the value at the right side of the screen. Using these two parameters
allows the user to zoom in to a specific measurement range and increase the level of detail on the
display. For example, if a wall thickness was nominally 25mm and an operator was assessing for
corrosion on this wall they might set the DELAY to 10mm and the WIDTH to 20mm to fit as much
relevant information on the display as possible.
B-START and B-DEPTH are analogous to DELAY and WIDTH or a B-SCAN display respectively.
DELAY and WIDTH or B-START and B-DEPTH may be adjusted in the hot menu or in the DISP
section of the main menu.
5.6.2 Adjusting DELAY and WIDTH (or B-START and B-DEPTH)
The quickest way to adjust DELAY and WIDTH is directly from the hot menu. Alternatively, adjust
the values using the menus:
1. Select MENU/DISP/DELAY or WIDTH and adjust using LEFT and RIGHT or press ENTER to
use the DIGITS EDIT BOX
2. Press OK to set the value
3. Press MEAS to return to the measurement.
5.7 GAIN
The gain (the amplitude of the transmitted pulse) can be adjusted to suit a variety of applications.
To obtain valid readings the gain must be set to the correct level to give reliable return echoes:
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Too much gain may result in erroneous measurements by detecting noise rather than the
material back wall itself.
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Not enough gain may result in intermittent detection. It may also result in lack of detection on
internal flaws, pits, or porosity.
The gain setting on your gauge can be compared to the volume control of a home stereo system.
If you turn it up too much you cannot hear the music clearly. If it is turned down too much, you cannot
hear it at all.
Note: When the echo-echo ThruPaint™ measurement mode is selected, the manual gain feature is
disabled and greyed out in the menu items. In this mode, your gauge switches to an automatic gain
mode (AGC) that optimises the gain setting automatically.
Your gauge has been optimised for a medium gain setting and for the majority of applications it can
be used at this setting. Some applications however may require lower or higher gain settings:
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Lower values might be necessary for noisy or granular cast materials. If the reading becomes
sporadic and will not settle down or resolve on a thickness value.
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Higher values may be necessary when trying to measure a material that is hard to penetrate
(due to the material type, or the overall thickness of the material) and when locating fine pits or
flaws. In these instances, increase the gain until the stability indicator reports a good
measurement.
5.7.1 To Adjust the Gain Value
The quickest way to adjust GAIN is directly from the hot menu. Alternatively, adjust the value using
the menus:
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