Epson USN 52R, USN 52L manual Operating the DGS

Operating the DGS Preparing the DGS evaluation

HNote:

There are 13 probes with the corresponding parameters stored in the unit. You can enter a probe of your own at probe number 16, please refer to Storing a new probe, Chapter 3.

HNote:

All of the following parameters must be programmed in order to generate a DGS curve.

–Enter the shape of the reference reflector in the REF-ECHOfunction.

–Enter the size of the reference reflector.

If you have selected Backwall as the shape of the ref- erence reflector, the size of the reference reflector is automatically infinite.

HNote:

The adjustable size of the reference reflector depends on the probe. The minimum size permitted is 5 % of the element diameter.

–Enter the sound attenuation in the reference block in the ATT-REFfunction.

–Enter the sound attenuation in the test object in the ATT-TESTfunction.

–Enter a value for the amplitude correction for angle- beam probes in the AMPL-CORfunction (correction value as per data sheet).

The following reference blocks are available for angle- beam probes:

•Reference echo for 2 MHz probes is the echo from the 100mm circular arc of the calibration block 1.

•Reference echo for 4 MHz (MWB...) probes is the echo from the 25 mm circular arc of the calibration block 2.

–Enter a value for the transfer loss in the T-CORRECTIONfunction.

AAttention:

When entering the transfer loss value it is important to note the following:

This value indicates changes in sensitivity (in dB) for the evaluation of discontinuities when the reference block and the test object have different coupling condi- tions (surface roughness and/or curvature).

DGS-22 Issue 02, 03/99 Krautkramer USN 52R/USN 52L Option DGS