152
EPOCH 4PLUS
Figure 105 API 5UE Software Option (cont.)
When API 5UE is activated, the function keys on the EPOCH 4PLUS aid the inspector in
collecting data for calibration and in collecting inspection data. The [F5] key allows the
operator to automatically bring any captured echo to 80% of FSH, which is helpful in
obtaining a precise A
max
reading from a reference notch.
9.17.4 Calibrating to a Reference Standard
The API 5UE code specifies that prior to inspection the instrument must be calibrated
using a reference notch of known depth (in certain circumstances, a through-drilled hole is
desirable for calibration – see API’s Recommended Practice 5UE for details concerning
reference standard selection). The depth of this reference notch must be entered correctly
in the activation menu for the API 5UE software option.
Prior to calibration with a reference notch, the instrument should be calibrated to verify
beam index point, refracted angle, and distance in the inspection material. See section 7.5
for details regarding angle beam calibration.
9.17.4.1 Envelope Mode
Calibrating the EPOCH 4PLUS to a reference notch is most easily accomplished using the
Envelope method of inspection. This mode requires the activation of the PEAK
MEMORY function. To activate the PEAK MEMORY function, press the orange PEAK
MEM key on the EPOCH 4PLUS keypad. The letter “P” appears to the right of the live A-
Scan display. Once the PEAK MEMORY function is activated, calibrate the instrument
using the following steps:
1. Find the signal from the reference notch and move the transducer back and forth
around the reference notch to create a peak envelope.
2. Adjust your screen range to adequately encompass the entire peak envelope.
3. Capture the width of the envelope with GATE 1, setting the gate level to under 40%.
4. Use the AUTO80% key [F5] to bring the maximum height of the peak envelope to
80% of FSH.
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