Campbell Met One 034A-L Manuál s instrukcemi stáhnout pdf (Strana 19)

Met One 034B Wind Set

The expression for wind speed (U) is:

U = MX + B

where

M = multiplier

X = number of pulses per second (Hertz)

B = offset

TABLE 7-2 lists the multipliers (M) and offsets (Off) to obtain meters/second

or miles/hour when the Pulse Count instruction is configured to output the

result in Hz.

TABLE 7-2. Wind Speed Multiplier*

Model Meters/Second Miles/Hour

034B M = 0.7989

Off = 0.28

M = 1.787

Off = 0.63

*When configured to output counts, the multiplier above is divided

by the execution interval in seconds.

7.4.2 Wind Direction

The CR200(X) dataloggers use the ExDelSE() instruction to measure wind

direction. All other CRBasic dataloggers use the BRHalf() instruction (see

Appendix B, Example Program, for example).

Excitation voltages, range codes, and multipliers for our dataloggers are listed

in TABLE 7-3. The multiplier value converts the sensor’s millivolt output to

degrees. Appendix D has additional information on the measurement

instructions.

TABLE 7-3. Parameters for Wind Direction

CR800

CR1000

CR5000

CR3000

CR200(X)

Measurement

Range, Integration

2500 mV, 60 Hz,

reverse excitation

5000 mV, 60 Hz,

reverse excitation

N/A

Excitation Voltage 2500 mV 5000 mV 2500 mV

Multiplier 720 720 0.288

Offset 0 0 0

7.4.3 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.

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 33 34

Komentáře k této Příručce

Žádné komentáře

Campbell Met One 034A-L Manuál s instrukcemi Strana 19

Komentáře k této Příručce

Související produkty a manuály pro Měření, testování a kontrola Campbell Met One 034A-L