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                                   BULLETIN
   FSB-107 - WORKHORSE BUG CAUSES LOW INTENSITY/PERCENT-GOOD VALUES IN BIN 1
                            DATE/REV:  01APR97 / 0
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ABSTRACT:  A Workhorse hardware problem causes low echo intensity and percent-
good values for Bin 1.

INSTRUMENT/PROGRAM AFFECTED:  All Workhorse ADCPs built before 01MAR97.

DESCRIPTION:  Workhorse ADCPs can have a problem with Beams 1 and 3 in the
echo intensity value measured in Depth Cell (Bin) 1.  A hardware limitation
causes the output to be low (e.g.; say 20 counts in an area that normally
reports 100 counts).  This in itself is not a problem as the ADCP can still
correctly process velocity data.

However, by default, the Workhorse always has its fish rejection algorithm
turned ON.  The low counts recorded for Bin 1 on Beams 1 and 3 cause the fish
rejection algorithm to reject the velocity data for Bin 1.  This will cause
you to see a Percent-Good value of zero for Bin 1.

Be aware that this problem will not always appear.  The configuration setup of
the system is the determining factor.  Unfortunately, there is no predictable
setup that will or will not cause this problem.

SOLUTION/ACTION:  You have two options to avoid this problem.

Long-Term - There is a hardware fix corrects this problem.  However, this fix
cannot be installed in the field because these are surface mount components
that can easily be destroyed by standard soldering irons.  If you would like
to return you system for repair, contact RDI for arrangements and scheduling.

Short-Term - You can avoid losing the data for Bin 1 by turning OFF the fish
rejection algorithm.  To do this, send the WA255 command to the ADCP. 
Remember, though, that this action may cause fish to contaminate your data. 
If you are in an area with a large fish population, and you need the data in
Bin 1, this may not be the best option for you.
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