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5.2 RF A-SCAN MEASUREMENT SCREEN (CG70ABDL only)
The RF view shows the full sound wave as
received by the gauge. The vertical axis
indicates the amplitude of the received wave
and the horizontal position indicates the time it
is received, which is converted into thickness
units using the material velocity.
The point on the scan that is being used to
calculate the digital thickness reading is
displayed as the vertical dashed line (see
section 9 on gates). The RF screen is used for
gauge setup prior to inspection.
5.3 RECT A-SCAN MEASUREMENT
SCREEN (CG70ABDL only)
The rectified view shows only half of the
waveform, either the positive or negative half depending on the POLARITY selected.
The RECT display is the preferred view for flaw and pit inspections
5.4 B-SCAN MEASUREMENT SCREEN
The time-based B-Scan display provides a cross sectional view of the
material being tested. In this example, the top, or accessible side of the
material is represented as 0.00", and the bottom, or blind surface at
.500".
This mode is used when you need to inspect the profile of the blind
surface. It can also be a useful view when scanning for pits and flaws.
The B-Scan display is equipped with a scan bar representing the
overall thickness. The scan bar gives the user a visual indication when
a flaw or defect passed over during the scan process.
If you are scanning a pipe, for instance, and pass over a pit during the
process, the scan bar will quickly deflect and alarm you to go back and
search for the defect.
5.5 DIGITS MEASUREMENT SCREEN
The digits display shows the thickness as a value using a large font
size. This view is used typically when the gauge is being used as a
basic thickness gauge. The digits display includes the same scan bar
as the B-Scan display.
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 WIDTH 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 WIDTH and the instructions for changing these
values is identical to those for DELAY and WIDTH - see instructions below.
0.16
0.39
0.61
0.83
0.16
0.39
0.61
0.83
DELAY:
0.00
W IDTH:
1.00
DELAY:
0.00
W IDTH:
1.00
MO DE :
P-E
G AIN:
36
MO DE :
P-E
G AIN:
36
G ATE 1:
0.00 G ATE 2:
0.00
G ATE 1:
0.00 G ATE 2:
0.00
THR:
2
LO C:
G 9
THR:
2
LO C:
G 9
G RID :
G RID :
0.16
0.39
0.61
0.83
DELAY:
0.00
W IDTH:
1.00
MO DE :
P-E
G AIN:
36
G ATE 1:
0.00 G ATE 2:
0.00
THR:
2
LO C:
G 9
G RID :
0.16
0.39
0.61
0.83
DELAY:
0.00
W IDTH:
1.00
MO DE :
P-E
G AIN:
36
G ATE 1:
0.00 G ATE 2:
0.00
THR:
2
LO C:
G 9
G RID :
0.16
0.39
0.61
0.83
DELAY:
0.00
W IDT H:
1.00
MODE :
P-E
G AIN:
36
G ATE 1:
0.00 G ATE 2:
0.00
T HR:
2
LO C:
G9
G RID :
8
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