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NOTE: When a DGS reference echo is stored, the
will appear in the display's status bar (upper left corner).
Note that only one DGS reference echo can be stored
at a time. To delete the currently stored reference, ac-
cess the REF CORR submenu, select DELETE REF,
and follow the on-screen prompts.
NOTE: When a DGS reference echo is stored, two
measurement result boxes will be automatically set
(if not already configured) to display SA and A%A
values.
These two adjustments should be made prior to re-
cording a reference echo. Changing these values after
the DGS curve is generated will cause the curve to be
deleted.
REF ATTEN (found in the REF CORR submenu)— Spec-
ify a sound attenuation value (in dB per inch or mm of
material thickness) for the material from which the known
standard is made.
AMPL CORRECT (found in the REF CORR submenu)—
Correction required when using an angle-beam type
probe. This value is specified on the probe's data sheet.
FIGURE 5-10—DGS Curve
PHASOR XS Operating Manual
5. Making Conventional Measurements
5.14.3 Display and Adjust the DGS Curve
Once a reference echo has been recorded, the DGS
curve is displayed simply by selecting the SETUP sub-
menu in the DGS menu, then setting the DGS MODE
function to ON
(Figure
value to OFF does not delete the curve — it simply
removes the curve from the display and disables the
DGS mode. Once the DGS Curve is displayed, it can be
adjusted using one of these three functions:
TEST ATTEN (found in the MAT ATTN submenu)—
Specify a sound attenuation value (in dB per inch or mm
of material thickness) for the material from which the test
piece is made.
TRANSFER CORR. (found in the MAT ATTN Submenu)
—dB compensation for difference in coupling conditions
between the known standard and the test piece. Setting
this to values other than zero will cause a "T" to be added
to the DGS Icon and the displayed gain value to appear in
a contrasting color, indicating that the amount of applied
gain differs from the listed "instrument" gain (the contrast-
ing color does not appear when the display color is set to
the high-contrast BLACK on WHITE).
DGS CURVE (found in the SETUP submenu)—Positions
the probe's DGS Curve based on the size of the reflector
(flaw) being tested. The setting will usually depend on the
largest acceptable flaw size.
5-10). Note that switching this
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