Using Software Options
Part # 910-250C
157
To inspect a separate crack or to collect new data for the same crack, press the CLEAR key
[F5] and follow the steps above to inspect again.
9.17.5.2 Manual Mode
Manual Mode may also be used in crack sizing. This mode allows the operator to
manually select the A
max
, T
1
, and T
2
points from a live A-Scan to obtain a crack depth
indication. The data collection process in Manual Mode is similar to the process described
above for Manual Mode calibration.
Once the API 5UE software has been properly calibrated to a reference notch, use the
following steps to size a crack using Envelope Mode:
1. Find the signal from the potential defect and bring it to maximum amplitude (see
API’s Recommended Practice 5UE for crack scanning and inspection requirements).
2. If necessary, use the AUTO80% feature ([F5]) to bring the peak amplitude to 80% of
FSH.
Note: The gain can be manually adjusted using the SCAN DB key [F4]. This
function adds or subtracts gain from a Reference Gain level. See section 4.3
for details on adjusting Reference Gain.
3. Once the peak amplitude is displayed on the screen, use the A
max
key [F2] to assign
this peak amplitude value as A
max
. Note the value of the peak amplitude in %FSH.
4. Move the transducer towards the potential defect until the peak has dropped to ½ the
value of A
max
(in % FSH) on the leading edge of the signal. Press T
1
[F2] to collect the
6 dB drop position of the leading peak and assign this value as T
1
.
5. Move the transducer away from the potential defect until the peak has dropped to ½
the value of A
max
(in % FSH) on the trailing edge of the signal. Press T
2
[F2] to collect
the 6 dB drop position of the trailing peak and assign this value as T
2
. The crack size
indication appears at the top right corner of the live A-Scan display.
Figure 112 Crack Size Indication
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