Campbell 05103 Instruction Manual - 4. Programming
05103, 05106, and 05305 R.M. Young Wind Monitors
3
Signal
CR7, 21X, CR23X,
CRBasic Dataloggers
CR10(X)
Wind Monitor with
Black Cable (P/N 9721)
WSPD (REF)
or G
G
Black
WDIR (REF)
or G
AG
White
WDIR (SIG+)
H or L (Analog Channel)
H or L (Analog Channel)
Green
WDIR (EX+)
Excitation
Excitation
Blue
WSPD (SIG+)
Pulse
Pulse
Red
Shield
or G
G
Clear
FIGURE 3-1. Wind Monitor Connections to Campbell Scientific Dataloggers
4. Programming
This section is for users who write their own datalogger programs. A
datalogger program to measure this sensor can be created using Campbell
Scientific’s ShortCut Program Builder software. You do not need to read this
section to use ShortCut.
4.1 Wind Speed
Wind speed is measured with the pulse count instruction. The wind vector
instruction is used to calculate average wind speed and direction. With the
pulse count instruction, specify a low level AC configuration, discarding counts
from excessive intervals, and the result in Hz. With this configuration, the
pulse count instruction divides the number of counts during the execution
interval by the interval in seconds before applying the multiplier and offset.
The expression for wind speed (U) is:
U = MX + B
where
M = multiplier
X = number of pulses per second
B = offset
Table 4-1 lists the multipliers to obtain miles/hour or meters/second when the
pulse count instruction is configured to provide its result in Hz. The helicoid
propeller has a calibration that passes through zero; use an offset of zero (Gill,
1973; Baynton, 1976).
TABLE 4-1. Wind Speed Multiplier
(With Configuration Code 21*)
Model
Miles/Hour Output
Meters/Second Output
05103 or 05106
0.2192
0.0980
05305
0.2290
0.1024
*When configuration code 11 is used, the multiplier above is divided
by the execution interval in seconds.