1. EPOCH 1000 Series Procedure Phased Array Angle Beam Calibration
2017/4/24
EPOCH 1000 Series Procedure Phased Array Angle Beam Calibration

2. Required Items Transducer and Wedge Test Block Couplant
2017/4/24
Required Items
Transducer and Wedge
5L16-A10P-P-2.5-OM probe
SA10P-N55S wedge
Test Block
TB (IIW block)
Guide block
Couplant
D-12

3. Probe and Focal Law Setup
2017/4/24
Probe and Focal Law Setup
Beam setup menu opens automatically when probe is connected
Automatic Probe Recognition makes probe setup easy!
All probe setups are done from one screen
Default settings for material and focal laws automatically generated for ease of generic setup

4. Probe and Focal Law Setup
2017/4/24
Probe and Focal Law Setup
Plug in Probe
Probe ID automatically recognized
Select Wedge ID from available list
SA10P-N55S for this example
Verify desired focal law settings
Default is sweep at 1 increments for this example
Press [ESC] when finished to return to live screen

5. 2017/4/24
Initial Settings
Set up additional live parameters using Direct Access Keys and Knob
Set Range to 10 inches
Set Angle to 45
Ready to begin calibration!

6. Three Step Calibration
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Three Step Calibration
Velocity
Zero Offset (Wedge Delay)
Sensitivity (Gain)
Notes:
Sometimes helpful to do sensitivity prior to zero offset to ensure consistent amplitude response.
Zero Offset and Sensitivity Calibrations will calibrate all focal laws in one calibration step!

7. 2017/4/24
Velocity Calibration
Determines the velocity of sound within the calibration block (should be similar to the test material)
Requires two reflectors of the same size at two different known soundpaths. (Same general principle as UT velocity calibration)
Velocity setting directly impacts the calculation of focal laws by the EPOCH 1000 – velocity calibration is critical to ensuring the selected focal law is correctly representing the displayed angle
Velocity calibration must be performed before the wedge delay calibration to ensure proper focal law calculation while determining zero offsets

8. Velocity Calibration (cont.)
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Velocity Calibration (cont.) 4” 1”
Set Calibration to CAL Velocity
Couple probe to block at “0” mark and face towards the block arc
Position Gate 1 around 4in signal
Peak up signal from 4 inches
Peak Memory can be used as an aid to finding the maximum signal peak
Bring the peaked 4 inch indication to 80% of full screen height
The AUTO-80% function can be used to achieve this gain adjustment quickly

9. Velocity Calibration (cont.)
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Velocity Calibration (cont.) 4” 1”
Turn Peak Memory OFF
Press the Depth 1 key
Use the knob to enter as the known soundpath of the reflector
Press Check to Continue

10. Velocity Calibration (cont.)
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Velocity Calibration (cont.)
NOTE: Do Not move the probe once the 4 inch signal has been peaked. The probe must remain in the same place on the block for the 9 inch signal.
Position Gate 1 further in time to surround the 9 inch signal
Use the Auto-80% function to adjust this signal to 80% FSH
Press the Depth 2 button
Use the knob to enter the value inches
Press Check to finish the calibration process and calculate the material velocity and focal laws

11. Zero Offset (Wedge Delay) Calibration
2017/4/24
Zero Offset (Wedge Delay) Calibration
Corrects for delay between transducer firing and when sound enters test piece for all focal laws
Similar to Zero calibration in UT
Each focal law represents a different angle of inspection, and therefore has a different BIP. The length of wedge material that the sound travels through is different for each focal law. This requires that each focal law have a separate zero offset calculation.
Single calibration step to calculate wedge delay for ALL focal laws.
Can be performed with either reflector of known depth, or of known soundpath.

12. Zero Offset Calibration (cont.)
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Zero Offset Calibration (cont.)
Set Range to 2 inches
Set Calibration to CAL Zero
Set the CAL mode to Depth
Couple probe to block at SDH
Set Angle to 45
Position Gate 1 around SDH signal
TIP: Gate start and width should be positioned so that the measurement from the SDH can be acquired for every focal law

13. Zero Offset Calibration (cont.)
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Zero Offset Calibration (cont.)
Use Peak Memory to peak up signal
Once signal has been peaked, turn OFF Peak Memory
Use the Auto-80% function to bring the gated signal to 80% FSH
Press Start to begin the calibration process
Enter in the dialog box (depth of reflector)
Use the Right Arrow key to highlight the continue button
Press Continue to begin acquiring the wedge delay data

14. Zero Offset Calibration (cont.)
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Zero Offset Calibration (cont.)
In place of the A-Scan, a line appears that represents the thickness measurement acquired from each focal law. When calibrated, this line should be a straight line showing that the thickness measurement for the given reflector is equal to the known depth of the reflector for each focal law.

15. Zero Offset Calibration (cont.)
2017/4/24
Zero Offset Calibration (cont.)
To acquire wedge delay data for calibration:
Move the probe over the side drilled hole to acquire thickness data across all focal laws
TIP: For the most accurate curve:
Move the probe slowly
Use a guide to avoid skew
Make multiple passes over reflector
Press Done when curve is complete.
NOTE: The wedge delay indication must not leave the gated region or become saturated for any focal law
NOTE: Use the Erase button to delete the curve and start again

16. Sensitivity (Gain) Calibration
2017/4/24
Sensitivity (Gain) Calibration
Sensitivity (gain) calibration normalizes the amplitude response of a given reflector across all focal laws (angles).
Ensures that the amplitude of a given reflector appears at the same screen height regardless of the angle (focal law) used to inspect that reflector.
Can be performed with either reflector of known depth, or known soundpath.

17. Sensitivity Calibration (cont.)
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Sensitivity Calibration (cont.)
Set Range to 2 inches
Set Calibration to CAL GAIN
Couple probe to block over the SDH
Set Angle to 45
Position Gate 1 around SDH signal
TIP: Gate start and width should be positioned so that the measurement from the SDH can be acquired for every focal law

18. Sensitivity Calibration (cont.)
2017/4/24
Sensitivity Calibration (cont.)
Peak up the SDH reflector and bring level to 80% of FSH
TIP: Use the Auto-80% function to automatically bring signal to 80% FSH
Use the ADD button to begin acquiring data for the sensitivity calibration

19. Sensitivity Calibration (cont.)
2017/4/24
Sensitivity Calibration (cont.)
Move the probe over the SDH reflector to collect amplitude data across all focal laws
NOTE: The sensitivity reflector indication must not leave the gated region or become saturated for any focal law
Press Done when curve is complete.
NOTE: Use the Erase button to delete the curve and start again

20. 2017/4/24
Calibration Complete!
Verify calibrated distances and sensitivity by switching between 45, 60 and 70 degree focal laws.
Instrument will display 0CAL and TVG flags indicate that Zero and Gain calibrations have been performed and are being applied (Active).

21. 2017/4/24
Image Overlays
For further detail and information from the calibrated image:
Show front of probe marker for easy surface distance interpretation
Displays vertical line corresponding to position of the front of the wedge
Show leg indicator on image.
Provides easy true depth marker of part thickness (first leg second leg)
Requires part thickness value to be correctly defined in the BEAM setup menu
Leg Indicator (based on part thickness)
Probe Front Cursor
Horiz. Dist. from Probe Front
Image overlays activated from Display Setup>Image Overlay menu