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CSAT3 Three Dimensional Sonic Anemometer

to apply the speed of sound correction described by Liu et al., 2001. The

CSAT3 can be configured to make a single measurement per trigger or

multiple measurements that are centered around the trigger (oversampled).

OUTPUTS: u

, u

, and c (u

, u

, are orthogonal wind components

referenced to the anemometer head; c is the speed of sound)

SPEED OF SOUND: determined from 3 acoustic paths; corrected for

crosswind effects

MEASUREMENT RATE: programmable from 1 to 60 Hz, instantaneous

measurements; two oversampled modes are block averaged to either 20 Hz or

10 Hz

MEASUREMENT RESOLUTION: u

and u

are 1 mm s

-1

rms; u

0.5 mm s

-1

rms; c is 15 mm s

-1

(0.025°C) with embedded code version 4

(standard) [c is 1 mm s

-1

(0.002°C) with embedded code version 3]. Values are

the standard deviations of instantaneous measurements made of a constant

signal. The noise is unaffected by the sample rate.

OPERATING TEMPERATURE RANGE: -30° to 50°C (standard); -40° to

40°C (cold shifted)

ACCURACY (-30° to 50°C and -40° to 40°C operating range; wind speed < 30

m s

-1

; azimuth angles between ±170°):

Offset Error:

, u

: < ±8 cm s

-1

: < ±4 cm s

-1

Gain Error:

Wind vector within ±5° of horizontal < ±2 percent of reading

Wind vector within ±10° of horizontal < ±3 percent of reading

Wind vector within ±20° of horizontal < ±6 percent of reading

2.2 Output Signals

The CSAT3 can output data to a data retrieval system using any of the

following communications: SDM (Synchronous Device for Measurement),

RS-232, or analog output. All the output signals have a two scan delay.

DIGITAL SDM: A Campbell Scientific, Inc. 33300 bps serial interface for

datalogger/sensor communication

Data type: 2-byte integer per output plus 2-byte diagnostic and 2-byte

configuration parameter

DIGITAL RS-232: Baud rate: 9600 bps or 19200 bps

Data type: 2-byte integer per output plus 2-byte diagnostic

ANALOG: Number of outputs: 4

Voltage range: ±5 V

Number of bits: 12

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 71 72

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