Kistler-Morse KM ultrawave - Manual (Page 70)

67 Mid gAin AdJ (consult Kistler-Morse before Modifying!)
Mid Gain Adj allows the adjustment of the TVG curve in the middle distance ranges. It is generally not used. Mid
Gain Adj has two submenus:
• Position is the distance (in the selected length units) from the face of the transducer to the beginning of
the midrange delay. The default for Position is 0.
• Delay sets the midrange delay. The distance (in the selected length units) over which the TVG remains
constant. The TVG curve is shifted out past Delay. The default for Delay is 0.
68 echo threshld (echo threshold)
Echo Threshld sets the echo threshold from 0 to 100.0%. The default is 35%. The echo threshold is the minimum
amplitude the echo must achieve to be accepted as a valid echo. If the echo has an amplitude less than Echo,
the UltraWave Series responds as follows:
• If in Auto TVG mode, the UltraWave Series increases the amplifi cation until it detects a valid echo or the amplifi cation
reaches High Limit. If the amplifi cation reaches High Limit without detecting a valid echo, the UltraWave Series
assumes that the echo is not from a valid target, ignores the echo, and transmits the next signal.
• If in Fixed TVG mode, the UltraWave Series assumes that the echo is not from a valid target, ignores the
echo, and transmits the next signal.
Note: 100% Echo = 5 VDC, 20% Echo = 1 VDC.
69 PeAK threshld
Peak Threshld sets the peak threshold for return echoes. Peak Threshld only effects the results if the UltraWave
Series is in Auto TVG mode. If the echo has an amplitude greater than Peak Threshld while in Auto TVG mode,
the UltraWave Series decreases the amplifi cation until the echo is below Peak Threshld or the amplifi cation
reaches Low Limit. Peak threshold can be set from 0 to 100.0%. The default setting is 50.0%.
70 rAnge/filters
71 MiniMuM rAnge
Figure 25: Range/Filters Menu Tree
Minimum Range displays and sets up the minimum range of the transducer. The minimum range is the minimum
distance from the face of the transducer where the UltraWave Series starts recognizing the return signal (echo).
The default minimum range is set past the transducer’s blind space to avoid interpreting the noise from the
transmission signal as a return signal. However, if there are obstructions near the face of the transducer, the
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97-1163-01 Rev. D
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