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8. First-order lag filter
Entering a formula
IIR(X#T)
X: Data channel No., T: Time constant (x 0.1 sec)
First-order lag filter calculation is processed on the channel X data.
Calculation detail
{dt
÷
(dt + t)} x (x – d) + d
dt: Sampling time
t: Time constant
x: Current value of channel X
d: Last calculation result
9. Increment per unit time
Entering a formula
PLS(X#T)
X: Data channel No., T: Unit time (1 to 10 x 0.1sec)
Increment per unit time is calculated. Specify a channel selecting integration operation for X.
When using PLS function, the data will be invalid when a reset of integration value occurs at a set time or by
another reason except overflow (because the same process as overflow reset is performed internally). Formulate
the operation in consideration of reset of integration value.
10. Wind display
Entering a formula
AZI(A)
A: Wind data
Wind display is made by converting numeric data into direction.
See the following table for the relation between wind data and displayed direction.
When A has a decimal fraction, the nearest direction will be displayed. Example: 1.2
→
NNE
A
Display
A
Display
•
•
•
•
•
•
8 S
9 SSW
10 SW
-3 WNW 11 WSW
-2 NW
12 W
-1 NNW 13 WNW
0 N
14 NW
1 NNE 15 NNW
2 NE
16 N
3 ENE 17 NNE
4 E
18 NE
5 ESE •
•
•
•
•
•
6 SE
7 SSE
Also, the scale of the channel selecting wind display as calculation type uses wind scale.
