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7.3 Distance-Amplitude Correction Function (DAC)
7.3.1
General
A DAC curve may be set depending on application requirements in different modes –
see also 4.8. CURVES Sub-Menu (SETTING):
Notes: Cross mark, indicating the echo peak against DAC, is
red
, when over the
curve, or
pink
, when its position is known (within the GATE 1 range).
In the DAC mode, echo dB value and position are related to the curve, not to
the horizontal gate.
DAC curve may be constructed using up to 20 points, which may be set in
any order – they will be automatically arranged in the ascending order.
7.3.2
DAC Interpolation Modes (DAC INTERP.)
See also 4.8. CURVES Sub-Menu (SETTING):
- LINEAR
- adjacent DAC curve points are connected by straight lines;
- LOG/LINEAR - adjacent DAC curve points are connected by curve with
constant slope in dB/m;
- LOG/LOG
- adjacent DAC curve points are connected by curve with slope
corresponding to dB/depth ratio (when two points are related to
the same reflector size in different depths).
7.3.3
DAC Modes (DAC MODE)
See also 4.8. CURVES Sub-Menu (SETTING):
There are two DAC modes available:
- FIXED
- the DAC curve will not change its position, when the GAIN
value changes;
- NORMAL
- the DAC curve moves accordingly to the GAIN value change,
i.e. trigger level is constant.
