DGS-6 Issue 02, 03/99 Krautkramer USN 52R/USN 52L Option DGS1.1 How to measure with the DGSThe DGS option (Distance - Gain - Size) enables you tocompare the reflecting power of a natural flaw in thetest object with the reflecting power of a theoretical flaw(disk-shaped reflector) at the same depth.e Attention:You are comparing the reflecting power of a natural flawwith that of a theoretical flaw (= disk-shaped reflector)at the same depth. No definite conclusions with regardto the natural flaw (roughness, obliqueposition, etc.) are permitted.The basis of this comparison of the reflecting powers isthe so-called DGS diagram. This diagram consists of aset of curves showing the interrelationship of three in-fluencing factors:• Distance D between probe and disk-shaped reflector,• Gain difference G between disk-shaped reflectors ofdifferent sizes and an infinitely large backwall,• Size S of the disk-shaped reflector.The factor S is always constant for one curve of the setof curves.The following illustrates the general DGS diagram. Thisdiagram is standardized with regard to the near-fieldlength and the element diameter:Introduction How to measure with the DGS1.1 How to measure with the DGSThe DGS option (Distance - Gain - Size) enables you tocompare the reflecting power of a natural flaw in thetest object with the reflecting power of a theoretical flaw(disk-shaped reflector) at the same depth.e Attention:You are comparing the reflecting power of a natural flawwith that of a theoretical flaw (= disk-shaped reflector)The factor S is always constant for one curve of the setof curves.The following illustrates the general DGS diagram. Thisdiagram is standardized with regard to the near-fieldlength and the element diameter:Introduction How to measure with the DGS
