EPOCH 1000 Series Procedure Conventional Angle Beam Calibration

EPOCH 1000 Series Procedure Conventional Angle Beam Calibration

u Basic Setup: u TRANSDUCER + WEDGE – A 541 S-SM – ABSA-5 T-45 u CABLE – BCM-74 -6 u TEST BLOCK – TB 7541 -1 (IIW) u COUPLANT – D-12

u 4 Steps for an Angle Beam Calibration – 1. Locate the Beam Index Point (BIP) of the Probe. – 2. Verify the Refracted Angle – 3. Calibrate for Distance (Using the Auto-Cal Feature) – 4. Calibrate for Sensitivity

u Adjust parameter settings for angle beam calibration. – Follow through the menu list to change parameters in best possible order – Under » Velocity – Set Shear Wave Velocity for 1018 Carbon Steel, 0. 1280 in/µs » Range – Set to 10 inches for best visibility – Under » » » Pulser – Set to Square Pulser Frequency – Set to 5 MHz Energy – Set to 100 V Damp – Set to 50 Ohms PRF – Set to Auto Mode

u Adjust parameter settings for angle beam calibration Cont. – Under » Filter – Set the filter to 2. 0 -21. 5 – Under » Angle – set to 45° – » Increase until response signal from transducer is visible

u Locating the Beam Index Point: – Identifies the point on wedge where the maximum energy is being transferred out • Instructions: 1. Align wedge on top of IIW block near zero mark with probe pointing towards the IIW’s curved edge. 2. Peak up signal* from the 4 inch reflector. • Locating beam index point set up Peak memory function may be use to aid in peaking up the signal 3. When signal is maxed, the zero mark on IIW block will correspond to the BIP point on the wedge. 4. Mark position on wedge that lines up with the zero mark on the IIW block. Locating the beam index point Gage and A-Scan setup

u Verifying the Refracted Angle: – Refracted angle of the wedge may vary due to properties of test materials or wear and tear of transducer wedge. • Instructions: 1. Set wedge on bottom of IIW block with probe pointing towards large circular hole. 2. Peak up* the received signal. • Verifying refracted angle setup Peak memory function may be use to aid in peaking up the signal 3. Using indication of BIP, reference the angle on IIW Block. 4. Under the menu select the parameter to enter the correct value. 5. Adjust the angle value with the knob. Verifying refracted angle Gage and A-Scan setup

u Calibrating for Distance – Adjusts the Zero and Velocity parameters to obtain accurate digital measurements during inspections • Instructions: 4” 1” 1. Line up the probe beam index point (BIP) above the zero mark. Set up for distance calibration 2. Position Gate 1 around the 4” reflector. 3. Use the Auto-XX% feature to bring the 4” reflection to desired reference screen height • For best results the probe should not be moved at all from this point until calibration is finished. A-Scan showing both 9” and 4” echoes

u Calibrating for Distance Cont. 5. Under the menu, select to Calibrate the Zero. 6. Enter 4. 000 for the value of the zero calibration by adjusting the knob. 7. Press the Check key to select and to finish the zero calibration. Calibrating for Zero Value using 4” echo

u Calibrating for Distance Cont. 8. Without moving the probe, position gate over the 9” reflection echo. 9. Use the Auto XX% feature to bring the 9” reflection to the desired screen height 10. Under the menu, select to Calibrate the velocity. 11. Enter 9. 000 for the value of the velocity calibration by adjusting the knob. 12. Finish Calibration by selecting by pressing the Check button. Calibration for Velocity Value using 9” echo

u Calibrating for Sensitivity – Sets up reference gain to size flaws • Instructions: 1. Set Probe to face the large circular hole and aim the BIP towards the 0. 600” deep side drill hole 2. Peak up the echo from the side drill hole. 0. 600” side drilled hole Set up for sensitivity calibration 3. Position gate over the signal above the 1 grid. 4. Use the Auto XX% function to adjust the side drill hole reflection to the reference height. 5. Use 2 nd. F+GAIN (REF d. B) to set the reference gain level. 6. Use the knob to add or subtract scanning gain for sizing flaws during inspection by adjusting the gain value. Locking the reference gain to add/subtract scanning gain