enters the change in value.
To select another transducer . . .
sets the point number to transducer.
Select desired transducer point.
P831, TVT shaper, must be ‘ on ’.
P833 TVT START MIN
Use this feature to adjust the TVT Curve height to ignore false echoes ( or pick up true echoes )
near the start of the Echo Profile.
Enter the minimum TVT Curve start point ( in dB above 1 µV RMS ).
This feature (preset to 45) should only be used if increased Near Blanking would extend
farther than desired into the measurement range.
values: -30 to 225
P834 TVT START DURATION
Use this feature in conjunction with TVT Start Min ( P833 ) to ignore false echoes ( or pick up
true echoes ) near the start of the Echo Profile.
Enter the time ( in ms ) for the TVT Curve to decrease from the TVT Start Min ( P833 ) point
to the TVT Curve baseline.
values: 0 to 9999
P835 TVT SLOPE MIN
Enter the minimum slope ( in dB / s ) for the middle portion of the TVT Curve.
This feature ( preset to 200 ) is used in conjunction with Minimum TVT Start Slope ( when a
long flat TVT Type is selected ) to ensure the TVT Curve remains above false echoes which
appear in the middle of the Echo Profile.
Alternatively, if TVT Type is set for "TVT Slopes" ( P830 = 6 ), this value is preset to 2000.
Use this feature to adjust the slope declination, as required.
values: 0 to 9999
e.g. return to transducer 1
%
ENHANCED PARAMETERS
PL-532 75
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