LSI LASTEM M-Log – User’s manual
36
It is not possible to combine arithmetical and vectorial calculations for each specific measure.
Program
3DOM
can be used to program the elaboration parameters.
The instrument doesn’t have infinite process capacity: it depends on the number of acquired and
calculated measures, on programmed actuation algorithms, on processings configured for each
measure, and on continuous communications between the instruments and the outside devices; all
these parameters cannot be programmed at the same time up to their available maximum, because
the instrument could have wrong operation. The instrument has right operation in the following
heavy duty condition:
All analogue and digital inputs configured with measures of resistance, tension, state and
frequency (4 kHz); every input sampled with 1 second rate;
Six measures configured like measures calculated with several algorithms;
The remaining measures (up to 50 measures) sampled by LSI CISS sensors with
transmission every 10 seconds;
Each measure is elaborated every 30 seconds with minimum, medium and maximum value
statistics and standard deviation;
All 10 active actuation logics configured with different algorithms and by the use of
acquired and calculated measures;
Serial communication constantly activated on both communication ports at maximum bit
rate.
It’s possible to
relax
some parameters in this configuration (for example the measures total number
or the active actuation logics number) in order to obtain best performances in other cases (for
example the measures activation slot)
5.3.1
Vectorial calculation specific for anemometric quantities
Average direction (prevailing)
Dm =
))
(
(
)),
(
(
atan2
Dir
rad
Cos
Dir
rad
Sin
gra
Resulting average direction
Dmr =
Vel
Dir
rad
Cos
Vel
Dir
rad
Sin
gra
))
(
(
,
))
(
(
atan2
Resulting average speed
Vmr =
n
Vel
Dir
rad
Cos
Vel
Dir
rad
Sin
2
2
))
(
(
))
(
(
Direction’s standard deviation (sigma theta)
DevStandDir=
2
2
2
))
(
(
))
(
(
1
asin
gra
n
Dir
rad
Cos
Dir
rad
Sin
Calm Percentage
