Odom ECHOSCAN, Manual

Page: 28 / 44

04/26/02 28
Revision 1.11
adjusting the “Bottom Tracking Algorithm” (LCDU / Digitizer
Settings ). This is only necessary if there is a noticeable and
consistent bowing in the bottom profile.
NOTE: If continuous bowing is observed in deep water, first
verify that the “velocity” setting is correct before attempting
to change the tracking algorithms. If the velocity is set too
low, depths will appear shallower on the outer beams and
visa versa. It is recommended that adjustments to the
“Bottom Tracking” be performed only experienced
ECHOSCAN system operators.
Normal (default) settings are listed below. Refer to Table 4_1 for
adjustment sequence and direction for various extreme bottom and
water column conditions.
Normal Settings:
Gain
…………………………………….…….. 2
Power ………………………………………… 2 (or mid-position)
Transmit Pulse Width ……………………….. 3
Center Beams Tracking Algorithm …..……. 5
Outer Beams Tracking Algorithm ………….. 5
Bottom conditions:
Shallow Deep
Hard
⇓
Gain
⇓
Power Output
⇓
Pulse Width
⇑
Gain
⇑
Power Output
Soft ⇓
Gain
⇓
Power Output
⇑
Gain
⇑
Power Output
⇑
Pulse Width
Sloped
⇓ Gain ⇑ Gain
Aerated (organic) Normal
⇑
Gain
⇑
Power Output
⇑
Pulse Width
Suspended Fluff
⇑
Power Output
⇑
Power Output
⇑
Pulse Width
Table 6
Extreme Condition Adjustments