Elcometer CG100ABDL Operating Instructions Manual page 10

5.6 CHANGING THE VIEWABLE RANGE
In RF view, RECT view and B-SCAN view, if the waveform around the detection point is not visible
on the display, use one of the following methods to adjust the viewable range of the display:
• When in RF view or RECT view, change the values of the DELAY and RANGE functions until
the measurement falls inside the viewable range of the display - see instructions below.
• When in B-SCAN view, change the values of the B-START and B-DEPTH functions until the
measurement falls inside the viewable range of the display. B-START is the equivalent of
DELAY and B-DEPTH is the equivalent of RANGE and the instructions for changing these
values is identical to those for DELAY and RANGE - see instructions below.
• Use the Auto Find function - see "Auto Find (CG100ABDL gauges only)" on page 18.
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 RANGE
The DELAY is the thickness value from which the A-SCAN display starts on the left of the screen.
The RANGE 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 range to 30mm to fit as much
relevant information on the display as possible.
B-START and B-DEPTH are analogous to DELAY and RANGE for a B-SCAN display respectively.
DELAY and RANGE 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 RANGE (or B-START and B-DEPTH)
The quickest way to adjust DELAY and RANGE is directly from the hot menu. Alternatively, adjust
the values using the menus:
1. Select MENU/DISP/DELAY or RANGE and adjust using LEFT or 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 ADJUSTING B-SCAN SCROLL SPEED (CG100ABDL gauges only)
The scrolling speed of the time-based B-SCAN can be adjusted to suit your measurement
techniques.
To adjust the scroll speed
1. Select MENU/DISP/B-SCAN SPEED
2. Choose a value between 1 and 10 (10 is fastest)
3. Press OK
4. Press MEAS to return to the measurement screen.
5.8 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:
• Too much gain may result in erroneous measurements by detecting noise rather than the
material back wall itself.
• Not enough gain may result in intermittent detection. It may also result in lack of detection on
internal flaws, pits, or porosity.
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