Spectral Doppler Mode
7.2.2.3 CW Gain Control
CW Gain controls the amplification of the incoming Doppler signals. The Doppler gain should be
adjusted to a level that fills in the grayscale of the spectral analysis waveform without creating a noise.
The [PW-Mode] key adjusts the CW Gain.
Rotation adjusts the amplification (brightness) of the entire displayed spectrum.
When the GAIN control is turned clockwise the entire spectrum gets brighter.
When the GAIN control is turned counterclockwise the entire spectrum gets darker.
Remarks:
* The actual gain value is displayed on the screen [GN ...]. Range: -15dB to 15dB
* Changing the CW Gain is only possible in write mode
independent from additional modes such as Color.
7.2.2.4 Sweep Speed
The [Speed] control allows you to selection of variable sweep speeds.
The faster sweep speed may be useful to analyze flow curves.
For example, to calculate a mean pressure gradient then it will be much easier to do this on a fast
speed trace than on a low speed trace.
The [Speed] key is found in the status area; review: CW Main Menu
(chapter 7.2.1)
By touching
⇧ or ⇩ , four different sweep speeds can be selected.
1 = 3.5 cm/s
2 = 5.0 cm/s
3 = 7.5 cm/s
4 = 10.0 cm/s (in relation to the system’s monitor)
Remarks:
Changing the speed is only possible in write mode.
7.2.2.5 Audio Signal
This flip switch changes the volume of the audio signal derived from the CW spectrum.
↑ both loudspeakers louder
↓ both loudspeakers lower
The volume is adjustable between 0 and 96 dB .
Voluson
®
730Pro - Basic User Manual
7-16 105831 Rev. 0
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