Vaisala PTU300 Guide de l'utilisateur Page 116

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User's Guide _______________________________________________________________________
114 __________________________________________________________________ M210796EN-G
Using Serial Line
Use the serial line command FILT to set the RH and T filtering level.
FILT [level] [extfactor]<cr>
where
level
=
Filtering level. The options are:
OFF (no filtering,
default setting)
ON (standard filtering, approximately 1
3 s moving
average)
EXT (extended filtering, approximately 1 min average
by
default but configurable by changing the extfactor)
extfactor
=
Weighted average factor for extended filtering level.
Range
0 ... 1, default 0.030.
In extended filtering mode,
the output is calculated
based
on the following formula:
[(
new result * extfactor) + (old result * (1.0 - extfactor))]
This
means that with extfactor value 1 the transmitter
will take only the latest measure
ment into account, but
with
extfactor value 0.1 a new output is a combination of
the previous output (90%) and the latest measurement
(10%).
Example (enable standard filtering):
>filt on
Filter : ON
>
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