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3. Operating in Phased Array Mode

PHASOR XS Operating Manual Page 41

can be manually entered as described in Section 3.6.4.

To ensure that the reference reﬂector is detected by

each beam angle, the Amplitude-Cycle-Diagram is

displayed along with the sector scan throughout the

standard recording process. Created as the probe is

moved over the reference reﬂector

(Figure 3-8), this

curve represents the reﬂected amplitude obtained for

each beam angle. The instrument requires that a valid

amplitude be measured for each beam angle before the

TCG reference point can be recorded (Section 3.6.1).

When operating in TCG mode

will appear on the

display screen. Before using the TCG Function do the

following:

• Ensure that all instrument settings (PULSER, RE-

CEIVER, etc.) have been made. Changing these

settings after the TCG reference points are input will

affect the accuracy of measurement.

FIGURE 3-7—Why compensation may be needed

Step 2: To unlock the knob, change the setting of dB

STEP to some value other than LOCK.

NOTE: Both knobs are disabled whenever operating

in Knob Emulator mode

3.6 Operating in TCG Mode (Phased

Array)

The depth at which identical reﬂectors occur causes

variation in the amplitude of resulting ultrasonic echoes.

In phased-array sector-scan mode, the TCG feature

compensates for the natural signal decay that results

from attenuation, the inﬂuence of “distance laws,” and

also the effect of beam angle on echo

amplitude (Figure 3-7).

To account for the effect of beam angle on echo

amplitude, TCG reference recording requires that each

reference reﬂector be detected by every beam angle

(described in Section 3.6.1). Alternatively, TCG points

GE Phasor CV User Manual

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