Campbell 05103 Instruction Manual - 5. Example Programs
05103, 05106, and 05305 R.M. Young Wind Monitors
5. Example Programs
This section is for users who write their own programs. A datalogger program
to measure this sensor can be created using Campbell Scientific’s Short Cut
Program Builder software. You do not need to read this section to use Short
Cut.
5.1 Wind Speed
Wind speed is measured with the Pulse Count instruction, and with the low
level AC configuration. For dataloggers programmed with Edlog, specify
configuration code 21 to output frequency in Hertz.
The expression for wind speed (U) is:
U = MX + B
where
M
=
multiplier
X = number of pulses per second (Hertz)
B
=
offset
Table 5-1 lists the multipliers to obtain miles/hour or meters/second when the
Pulse Count instruction is configured to output Hz (configuration code 21).
The helicoid propeller has a calibration that passes through zero, so the offset
is zero (Gill, 1973; Baynton, 1976).
TABLE 5-1. 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.
5.2 Wind Direction
The wind vane is coupled to a 10K potentiometer, which has a 5 degree
electrical dead band between 355 and 360 degrees.
The EX-DEL_SE measurement instruction is used for dataloggers that are
programmed with Edlog (e.g. CR10X, CR23X) and the CR200. The
measurement result is mV; the multiplier to convert mV to degrees is
355deg/excitation mV.
The BRHalf measurement instruction is used for dataloggers that are
programmed with CRBasic (e.g. CR1000, CR3000). The multiplier to convert
the measurement result (mV/excitation mV) to degrees is 355.
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