Specifications

11. Using DAC/TCG
Page 72 USN52 L Operating Manual
When programming a TCG/DAC curve, data points may be en-
tered in any order. The first point recorded is the amplitude refer-
ence echo (see note below). Calibrate the A-scan (Chapter 9)
and proceed as follows:
1. Couple the probe to the reference block or test piece and
optimize the first (reference) echo.
2. Use GAIN to adjust the reference echo signal to the desired
amplitude:
NOTE: All subsequent data points will be automatically
later adjusted to the same amplitude as the first reference
echo.
Reference echoes cannot exceed 100% screen height. This
is the maximum amplitude that can be evaluated by the
instrument during DAC/TCG recording.
3. If necessary, adjust gate parameters so that the reference
echo is the only signal in the gate and exceeds threshold, as
illustrated below.
4. Activate DAC RECORD mode by simultaneously pressing
aligned with the DAC/TCG function.
5. Record the first echo amplitude for the curve in DAC memory
by pressing
aligned with the DAC ECHO function. Note
that DAC ECHO displays the number of echoes (points) re-
corded.
6. Optimize the echo for the second data point.
7. If necessary, adjust GAIN so that amplitude of the reference
echo signal exceeds gate threshold.