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21.3 DRAWING A DAC CURVE
1. Couple the transducer to the first
calibration standard and peak up on
the reflector, adjusting the gain to keep
the signal height within the boundaries
of the waveform display area, and at a
suitable height to allow for attenuation
at greater depths in the overall range to
be tested.
2. Enable the DAC function and adjust
the DAC settings to your requirements
(see "Adjusting DAC Settings" on
page 40). Ensure that the value of
DRAW is set to ON.
A highlighted cursor is displayed in the waveform area, starting at the left most side of the
measurement screen.
3. In the hot menu, scroll to DAC BOX.
4. Use LEFT and RIGHT to move the cursor over the section of the waveform to be used as the
first point in the DAC curve and then press ENTER to set the first point of the curve.
5. Repeat step 4 multiple times to set other points of the curve.
The DAC curve is displayed after three points have been set/recorded, and will continue to be
redrawn/updated for each additional point added.
Note: A DAC curve can contain a maximum of eight points.
Note: Any point can be cleared by pressing CLR when the value of DRAW is set to ON.
6. Press MENU, scroll to the DAC menu and then highlight the DRAW function.
7. Use LEFT and RIGHT to scroll the value of DRAW to OFF.
The DAC curves are now set and ready to be used for inspection.
8. Optional: To display the DAC curve:
•
In the DAC menu, highlight the CURVE function.
•
Use LEFT and RIGHT to scroll the value of CURVE to ON.
•
Press MEAS to return to the measurement screen.
The DAC curve is displayed.
41
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