Campbell Met One 034A-L Spezifikationen PDF herunterladen (Seite 9)

Met One 034B Windset

The CR10X, CR23X, and dataloggers programmed with CRBasic can also

measure wind speed on a control port. With this option the black wire is

connected to the 5 V terminal.

CONNECTOR PIN-OUT

PIN 1 - AZIMUTH SIGNAL

PIN 2 - AZIMUTH REFERENCE

PIN 3 - AZIMUTH EXCITATION

PIN 4 - PULSE OUT

PIN 5 - PULSE REFERENCE

PIN 6 - SHIELD

034B-L Windsets purchased directly from Met One Instruments

have a different configuration on the 6 pin connector. In

addition, they do not have the 10 kΩ resistance on the excitation

line. The wiring diagram and the multiplier and offset, for wind

direction, are different than the examples in this document.

NOTE

5. Programming

This section is for users who write their own programs. A datalogger program

to measure this sensor can be created using Campbell Scientifics’ 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, using the Switch

Closure configuration and set to output frequency in Hertz (see Section 5.4 for

examples).

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 (M) and offsets (Off) to obtain meters/second or

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

in Hz.

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Campbell Met One 034A-L Spezifikationen Seite 9