1 / 16

EPOCH 1000 Series Procedure Phased Array DAC/TVG

EPOCH 1000 Series Procedure Phased Array DAC/TVG. PA DAC/TVG Feature Overview. The EPOCH 1000 i offers a combined DAC/TVG sizing feature standard for phased array mode: Includes ASME, ASME-3, JIS and Custom features Quick setup using modified GAIN calibration tool

Download Presentation

EPOCH 1000 Series Procedure Phased Array DAC/TVG

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. EPOCH 1000 Series ProcedurePhased Array DAC/TVG

  2. PA DAC/TVG Feature Overview The EPOCH 1000i offers a combined DAC/TVG sizing feature standard for phased array mode: • Includes ASME, ASME-3, JIS and Custom features • Quick setup using modified GAIN calibration tool • Edit features allows individual point edits for increased accuracy at critical angles • Designed for intuitive compatibility with conventional DAC/TVG procedures

  3. Test Block EP1000-PABLOCK-1 Couplant D-12 Required Items • Transducer and Wedge • 5L16-9.6X10-A10P-P-2.5-OM probe • SA10P-N55S wedge

  4. Feature Activation • Proper calibration is required prior to activation of the DAC/TVG feature for precise measurements • The DAC/TVG activation is located in the SIZING OPTION menu group under [P1] (DAC/TVG) • Under the DAC/TVG menu, select the desired curve method • In this example, use ASME-3 • NOTE: If GAIN calibration has already been performed, the message belowwill appear. Select NO for thisdemonstration

  5. Acquiring DAC Points • As with the conventional DAC/TVG feature, the user must capture individual points using the DAC function. • Use the PA Demo Block’s side drilled holes (SDH) to build a demonstration DAC curve • Place the 5L16 probe on top of the demo block, over the most shallow SDH, and facing the closest side of the block

  6. Acquiring DAC Points (cont.) • After exiting the DAC/TVG activation menu, the instrument will default to the PA CAL group, with the Calibration type DAC active • Use the same procedure as GAIN calibration to acquire each individual SDH as a point on the DAC curve: • Set reference cursor to 45 degrees • Position Gate 1 to capture an amplitude measurement from the SDH across all angles • Use AUTO 80% to bring the SDH reflection to 80% at 45 degrees • Press [P1] (ADD) to begin point calibration • Press [P2] (DONE) after successful acquisition of each point

  7. DAC Point Acquisition Screens

  8. Functions During DAC Acquisition • AUTO-80% may be used for each reflector to bring the initial reflection to 80% and allow proper amplitude measurement across angle range • Range adjustment is valid during DAC acquisition • Angle adjustment is valid to view any live A-scan individually • Gate adjustment is valid during DAC acquisition • [P3] (ERASE) key erases the ENTIRE curve • [P4] (Delete) key deletes the last point of the curve for re-entry

  9. Gate Positioning During DAC Acquisition • It is critical to avoid collecting amplitude information from other sources during DAC setup. • This is especially true for the deepest SDH in the PA Demo Block. • Use Gate adjustment during amplitude measurement acquisition to avoid incorrect readings

  10. Completed DAC from PA Demo Block

  11. DAC/TVG Menu • Once DAC points have been acquired, the DAC group menu appears beside [F2] (DAC) in group 4/5 • P1 – Toggles between DAC and TVG view on the active A-scan • P2 – Adjusts DAC Curve Gain to properly size in the far field • P3 – Adjusts the gain step for Curve Gain • P4 – Selects visible curve for live A-scan measurement comparison • P5 – Allows individual DAC point edit • P7 – Turns DAC function OFF without entering a setup menu

  12. Point Edit Function • For conventional procedure compliance, it is critical to have accurate curves represented at 45, 60 and 70 degrees • The EDIT function allows the user to edit the TOF and Gain of any individual DAC point acquired during setup • EDIT uses a TVG Table format for simplicity

  13. Edit Feature Utility • The EDIT feature is especially important to make the overall DAC acquisition process faster • Allows user some basic inaccuracies of the initial setup that can be removed later • High angles (such as 70 degrees) often require editing for precision • See 70 degree amplitude acquisition as an example!

  14. Editing DAC Points To edit individual DAC points: • Enter the EDIT mode from the DAC menu • Use the Angle/Cursor button to select the desired angle • Press [P1] (Edit) to enter the TVG Table

  15. Editing DAC Points (cont.) • Use the arrow keys to navigate to cells within the table • A purple square (top) and red crosshair (bottom) on the live A-scan indicates the TOF position of the selected row in the table • Use the knob to increase/decrease the gain of each point at critical angles to meet 80% exactly MOST COMMON ADJUSTMENT

  16. Phased Array DAC/TVG and the EPOCH 1000i • It is important to note that the EPOCH 1000i handles some aspects of DAC/TVG differently than other PA instruments • To standardize to conventional DAC/TVG usage, the displayed Reference Gain for each focal law represents the gain required to bring the first DAC point at that focal law to 80% full screen height • This means that there could be a different Ref dB for every focal law • This is true of conventional UT at varying angles, as well • Advantage of PA: One DAC calibration file handles all critical angles instead of multiple DAC curve setups that require recall and verification!

More Related