700-SDI-RADAR-300WL-Man Rev 2 11 Apr Mar 2022
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Part# 21371
Filter Length:
The length of the averaging filter, in number of readings, to smooth the
measured values. The instrument performs 10 readings per second, so a filter length
value of 50 will result in 5 second integration time. When using longer filter lengths,
more measured values are used for filtering, and the resulting data will be smoother.
However, when the surface velocity changes, it will take more time for the new
measurement to be reported. Typically, this parameter should be set to a value
between 50 and 200. For highly turbulent water, longer filter length is
recommended.
Direction Filter:
The Direction Filter is used to choose whether the instrument will detect
flow in both directions, or if it should detect only incoming or outgoing flow. If the
direction filter is set to both directions, the instrument will measure the flow velocity
in any direction and will also report actual direction of the flow. If the direction filter
is set to incoming direction, then the instrument will reject all radar returns that
correspond to outgoing flow and
vice versa.
On monitoring sites where it is expected
that the flow will always be in one direction, it is recommended to properly configure
this parameter to either incoming or outgoing, as that will improve the consistency of
measurements.
