Dakota Ultrasonics DFX-7 plus MANUAL1 - Manual (Page 86)

Dakota Ultrasonics
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2) 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.
3) Press the LEFT and RIGHT arrow keys to move the cursor over the
waveform that will be used to set the REFERENCE GAIN and draw the
DGS curve.
Note: The DGS curve uses 16 points to plot the curve.
4) Press the MENU key once to activate the menu items tab. Press the MENU
key multiple times to tab right, and the ESC key multiple times to tab left,
until the DGS menu is highlighted and displaying the submenu items.
Alternatively, press the LEFT and RIGHT arrow keys multiple times using
the left button wheel.