Epson USN 52L User Manual

Page 196

Krautkramer USN 52R/USN 52L Option DGS

Issue 02, 03/99

DGS-21

For the reference echo you need a test block with a
known reflector. This reflector can be one of the follow-
ing types:

• backwall

• disk-shaped reflector

• side-drilled hole. With known diameter of the side-

drilled hole, the diameter of a corresponding disk-
shaped reflector can be calculated, provided that the
following requirements are met:
D

SDH

³ 1,5 l

³ 1,5 N

with

SDH

diameter of side-drilled hole

sound path in the test object

wavelength in the test material

near-field length of the probe used
in the test material

ESR

diameter of the equivalent
disk-shaped reflector

ESR

Operation

H Note:

Before measuring, use M to select the setting PEAK
in MEASURE. In addition, activate the gate.

– Connect the required probe to the USN 52 R and

select a suitable reference block for receiving the
reference echo.

– Adjust the A-scan and digital display (please refer to

USN 52R/USN 52L Operating Manual, Chapter 5).

Attention:

Proper A-scan and digital calibration will
assure that the MTL VEL and ZERO parameters are set
correctly, which is necessary for an accurage DGS
curve.

– Switch to the second operation level: X

– Tag the function table DGS: T or V

– Tag the left column of the DGS function group using

J or C.

– Select the required probe number.

Ц2

p lÖsD

SDH

Preparing the DGS evaluation

Operating the DGS