YUSHI INSTRUMENTS
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4.4 Making of DAC Curve (NB/T 47013-2015 by CSK-IIA block)
1. First calibrate the probe as above mentioned
2. Couple the probe to the reference block to make the echo of the first reference point reach the highest
level (we use CSK-IIA test block as an example, as shown in Figure 4-10).
3. Press the start menu of Gate A to set its position and lock the echo, press to let the echo
display 80% of the screen automatically when it is the highest wave.
4. Press and press again when the first DAC curve is displayed on the screen, the value of
the DAC echo on the submenu is 1 automatically.
5. Move the probe to make the level of the echo of the next reference point be highest, move the gate to
catch the echo, and repeat step 4. At this point, the value of the DAC echo on the submenu is 2
automatically.
6. During the recording, if you find there is something wrong with the newly-recorded reference point,
on the DAC submenu, press to delete this point.
7. The other points can be handled in the same way. The instrument can measure nine point at most. The
general order of the test points is (10mm, 20mm, 30mm, 40mm ...).
8. After all the reference points are recorded, a curve is displayed on the screen, press (up) or
(down) to set it on RL, then press (left) or (right) to set the corresponding value. SL
and EL can be handled in the same way.
4.5 Making of AVG Curve
A. Bottom mode
Figure 4-10