The "flow" menu
43
Interference echo suppressio: Basic principles
The "flow N check value" and "flow N mapping" parameter sets are used to configure the inter-
ference echo suppression of the Prosonic S.
The following picture shows the operating principle of the interference echo suppression:
L00-FMU90xxx-19-00-00-yy-030
1: The envelope curve (a) contains the level echo and an interference echo. Without interference echo suppression, the
interference echo is evaluated.
2: The interference echo suppression generates the mapping curve (b). This curve contains all echos which are located
within the range of mapping (c).
3: From now on, only those echos are evaluated, which are higher than the mapping curve. The interference echo is igno-
red because it is lower than the mapping curve.
!
Note!
In order to include all interference echos, the interference echo suppression should be performed
with the level as low as possible. If during the commissioning the channel can not be sufficiently
emptied, it is advisable to repeat the interference echo suppression at a later point of time (as soon
as the level reaches nearly 0%).
"flow N check value" (N = 1 or 2)
L00-FMU90xxx-19-00-00-de-031
1
(a) (a)
(b)
(c)
2
(a)
(b)
3
⇒
flow 1 check value F1006
distance:
check distance:
D
display
=D
D
display
>D
D
display
<D
?
D
L0000
flow 1 check value
distance:D
display
check distance:
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