Campbell Scientific 03001-L R.M. Young Wind Sentry Set - Manual (Page 12)

R.M. Young Wind Sentry
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 (P4) is used for dataloggers that are
programmed with Edlog (e.g. CR10X, CR23X) and the CR200. The multiplier
to convert the measurement result (mV) to degrees is 355 deg/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.
Excitation voltages, range codes, and multipliers for CSI dataloggers are listed
in Table 5-2. Appendix B has additional information on the P4 and BRHalf
measurement instructions.
TABLE 5-2. Parameters for Wind Direction
CR10(X)
CR510
CR200
CR7
21X
CR23X
CR800
CR1000
CR5000
CR3000
Measurement
Range 2500 mV,
slow 5000 mV,
slow/60 Hz 2500 mV,
60 Hz,
reverse
excitation 5000 mV,
60 Hz,
reverse
excitation
Excitation
Voltage 2500 mV 5000 mV 2500 mV 5000 mV
Multiplier 0.142 0.071 355 355
Offset 0 0 0 0
5.3 Wind Vector Processing Instruction
The Wind Vector output instruction is used to process and store mean wind
speed, unit vector mean wind direction, and Standard Deviation of the wind
direction (optional) from the measured wind speed and direction values.
5.4 Example Programs
The following programs measure the 03001 every 5 seconds, and store mean
wind speed, unit vector mean direction, and standard deviation of the direction
every 60 minutes. Wiring for the examples is given in Table 5-3.
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