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5. Dew-point temperature
Entering a formula
DEW(T#H)
T: Channel No. of temperature data, H: Channel No. of relative humidity
Dew-point temperature is obtained from the following calculation.
t: Temperature data
h: Relative humidity data
D: Dew-point temperature
(1) K = t + 273.15
(2) When t
≥
0:
W = EXP (-5800.2206 / K + 1.3 K x (-0.048 K x (0.41764768E-4
- 0.14452093E-7 x K)) + 6.5459673 x LOG(K)) / 1000
When t < 0:
W = EXP (-5674.5359 / K + 6.3 K x (-9.677843E-3 + K x (0.62215701E-6
+ K x (0.20747825E-8 - 9.484024E-13 x K))) + 4.1635019 x LOG(K)) / 1000
(3) S = W x h / 100
(4) P = S x 1000
(5) Y = LOG(P)
(6) When P
≥
611.2:
D = -77.199 + Y x (13.198 + Y x (-0.63772 + 0.071098 x Y))
When P < 611.2:
D = -60.662 + Y x (7.4624 + Y x (0.20594 + 0.016321 x Y))
6. Moving average
Entering a formula
AVE(X#T)
X: Data channel No., T: Time-line range [sec]
An average value in the past T seconds is calculated.
AVE
Sampling period
1sec
T range
1 to 10sec
7. Past data
Entering a formula
OLD(X#T)
X: Data channel No., T: Backward time [sec]
Data obtained T seconds before is acquired.
OLD
Sampling period
1sec
T range
1 to 10sec