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3
Select the AVG submenu, then the PROGRAM function. Turn the knob to start the AVG
program. When AVG program is triggered, “AVG” appears indicating the point index on the top right
corner of the display.
4
Couple the probe to the known standard, capture the reference flaw so that its reflected echo is
displayed on the instrument’s A-Scan, and adjust selected Gate’s starting point to ensure that the
resulting echo triggers the gate.
5
Adjust the gain until the reference flaw’s A-Scan peak measures 80% of FSH (Full Screen
Height).
6
With the probe coupled to the standard, and the reference flaw’s echo captured by selected
Gate, press
key to record an AVG reference echo.
7
After the AVG reference echo is recorded, its value may be manually adjusted using the
ADJUST function.
8
When complete press
key after FINISH is selected and follow the on-screen prompts to
exit the AVG program.
Note that only one AVG reference echo can be stored at a time. To delete the currently stored reference
1
Access the DEL submenu
2
Select DEL AVG, and then follow the on-screen prompts.
Once a reference echo has been recorded, the AVG curves (the AVG-UL, the AVG-ML and the AVG-DL)
are automatically displayed using default settings.
Creating AVG Offset Curves
When operating with AVG turned on, three AVG curves including the AVG-UL, the AVG-ML and the
AVG-DL are typically displayed. The three curves can be offset by user-inputted equivalent flaw size
values in the AVG-UL, AVG-ML and AVG-DL selection. The offset values will usually depend on the
largest acceptable flaw size.
Deleting AVG Curve
To delete stored AVG curve
1
With the AVG menu activated, select the DEL submenu.
2
Select DEL AVG function.
3
Press
key DEL AVG function a second time or turn the knob. Then follow the on-screen
prompts to confirm the deleting.
Turning On/Off the AVG display
Turning the AVG DISP On and Off causes the AVG curve to be displayed or removed.
1
With the AVG menu activated, select the DISPLAY submenu.
2
Select the AVG DISP function.
3
Press
key a second time or turn the knob to turn On/Off the AVG display.
Note that if the AVG curve is not created, it will prompt out “No AVG curve found” and AVG DISP value
will be OFF. Also note that switching this value to OFF does not delete the curve - it simply removes the
curve from the display and disables the AVG mode.
Evaluating Test Samples in AVG Mode
Once the AVG curve is recorded and displayed, echoes are automatically compared to the AVG curve
and evaluated based on the recorded reference. The result is shown as ERS (Equivalent Reflector Size),
which evaluates the reflected echo and calculates the equivalent reflector size.
