BSA Flow Software Installation and User's Guide - CSI

11. To monitor the Doppler signals, right click on Processor, Group 1,
LDA 1, PDA 2 or PDA 3 in the BSA Application window, and select
System Monitor from the list. An “always on top” window appears.
After a short delay, an oscilloscope-like display will appear in this
window. This shows a number of samples of the filtered Doppler
bursts. The number of channels depends on the optical configuration
(1,2,3D LDA or PDA)
In addition to the oscilloscope display it includes panes showing
acquisition parameters and the photo-multiplier anode current. The
three panes can be collapsed individually by clicking on the button in
their upper right corner.
Figure 4-40 System monitor in fixed record length mode (left) and
auto-adaptive mode (rigth)
The two vertical dotted lines in the Scope section indicate the record
length that is passed to the FFT processor to determine the Doppler
frequency. In auto-adaptive mode, the two sets of vertical line
correspond to the minimum and maximum record length (see chapter
5.3.6 System Monitor).
Note: The record length is not displayed with BSA F30 and BSA P30
processors
Recognising a good Doppler burst requires some experience. The
validation rate a good indicator. You can see the validation rate in the
System monitor window.
Checking for coincidence in 2D and 3D systems is described in
Chapter 5: System Monitor.
12. Optimise data rate and validation by adjusting the sensitivity, gain
settings and record length settings under the Range and gain properties
or the Quick calibration. The record interval should be shorter than or
equal to the length of the displayed bursts, as in the shown example
Warning Avoid overloading the photomultipliers.
BSA Flow Software: The user interface 4-59