218 Chapter 15
Doppler angle
on
VF can only be measured with the Doppler angle on.
TAM (Time Average Mean)
The time average mean is the average value of measured frequencies over the time.
You can measure TAM in different ways:
•
Automatic – the Doppler curve is drawn automatically and you position markers
on it.
•
Manual – you draw the Doppler curve manually.
Doppler angle
on
TAM can only be measured with the Doppler angle on.
Figure 15-2. Measuring TAM on the Doppler spectrum.
To measure TAM on an automatically drawn curve:
1
Click Auto, then make sure that TAM is selected.
2
Position 2 line markers to specify the time interval over which the frequency
values are averaged. (See Fig 15-2.)
The TAM value is displayed to the left of the image.
You can also draw a Doppler curve manually on the spectrum and use it to measure
TAM.
NOTE:
Make sure that the trace appears to be a good fit to the spectrum so that
the basis for the automatic calculation is correct.
To measure TAM manually:
1
Click TAM.
2
Draw a curve that outlines the spectrum, starting and ending at the same part of
the cycle.
Содержание Pro Focus 2202
Страница 1: ...English BB1279 A June 2005 Pro Focus 2202 Extended User Guide ...
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