5. Making Conventional Measurements
Page 70 PHASOR XS Operating Manual
5.7 Freezing the A-Scan Display
Whenever an A-Scan is active, pressing the freeze
key (
) freezes the A-Scan display. The active A-Scan
will remain as it appeared when
was pressed and the
display will remain frozen until
is pressed again.
While the display is frozen, the displayed readings are
based on the frozen echoes.
5.8 DAC/TCG EVALUATION MODE
NOTE: Result-evaluating features, such as DAC/TCG,
are first selected via the EVAL MODE function (located
in the EVAL Menu). The selected evaluation feature’s
menu then appears in the HOME Menu.
Conventional measurements can be made using the Time
Corrected Gain (TCG) and Distance Amplitude Correction
(DAC) functions (
Figure 5-6). These functions are ac-
cessed through the DAC/TCG Menu on the HOME Menu
bar. Both the DAC and TCG functions operate based on
a set of user-recorded data points. These points are re-
corded from the DAC/TCG menu as described below.
The TCG function displays reflectors of equal size at equal
A-Scan amplitudes, regardless of the reflector’s depth in
the test material. This is accomplished by adjusting the
gain at different locations in the A-scan display, corre-
sponding to different material depths, to compensate for
signal loss (or variation) due to attenuation, beam spread,
or other factors. When TCG is activated,
appears in the
status bar near the top right-hand corner of the display.
The DAC function displays all echoes at their true
amplitude (without depth compensation). However,
when operating in DAC mode, a Distance Amplitude
FIGURE 5-6—Distance/Time Compensation Features
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