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CSAT3 THREE DIMENSIONAL SONIC ANEMOMETER

TABLE 10-2. CR23X and 21X Execution Interval and CSAT3 Execution Parameter

CR23X/21X Execution

Interval (seconds)

CR23X/21X Execution

Frequency (Hz)

CSAT3 Execution Parameter

0.05 20 20

0.0625 16 15

0.075 13.333 12

0.0875 to 0.1 11.429 to 10 10

0.1125 to 0.1625 8.889 to 6.154 6

0.175 to 0.2 5.714 to 5 5

0.2125 to 0.325 4.706 to 3.077 3

0.3375 to 0.5 2.963 to 2 2

0.5125 to 1 1.951 to 1 1

TABLE 10-3. CR10(X) Execution Interval and CSAT3 Execution Parameter

CR10(X) Execution Interval

(seconds)

CR10(X) Execution Frequency (Hz) CSAT3 Execution Parameter

0.0625 16 15

0.078125 12.8 12

0.09375 10.667 10

0.109375 to 0.15625 9.143 to 6.4 6

0.171875 to 0.1875 5.818 to 5.333 5

0.203125 to 0.328125 4.923 to 3.047 3

0.34375 to 0.5 2.909 to 2 2

0.515625 to 1 1.939 to 1 1

Ux Input Location: The Input Location to store

the first of five data values. The CSAT3 returns

the following data after receiving the “Trigger

and Get Data” or “Get Data after a Group

Trigger” command in parameter 3. These data

are: u

, u

, c or T

, and a diagnostic word,

where u

, u

, and u

are the wind speeds along

the x, y, and z axes defined by the anemometer

head (see Figure 4-1), c is the speed of sound,

and T

is the sonic virtual temperature. The

wind speed and the speed of sound are in units

of m s

-1

, and T

is in degrees Celsius. If the

Reps option in parameter 1 is greater than 1,

the number of sequential Input Locations used

is Reps ∗ 5.

10.2 DIAGNOSTIC WORD

The fifth output from the CSAT3 is the diagnostic

word. The diagnostic word describes the status

of the anemometer and is useful in filtering data.

For example, when the anemometer is locking in

on the ultrasonic signals after receiving the

Acquire signals command, the -99999’s it sends

to the datalogger, for the science data, can be

filtered out of the statistics based on the

diagnostic word, see the example flux program

in Section A.

The SDM-CSAT3 instruction (P107), decodes

diagnostic word and represents it in base 10.

The bits in the diagnostic word are grouped

together into three categories. Bits 15 through

12 are four diagnostic flags (see Table 10-4 and

10-5), bits 11 through 6 represent the range the

measurements are reported in (used by

Instruction 107), and bits 5 through 0 are a

counter. A detailed description of decoding the

diagnostic word is given in Appendix B.

TABLE 10-4. Diagnostic Word

Diagnostic Word

b15 - b12 b11 b10 b09 b08 b07 b06 b05 - b00

diagnostic

flags

range

counter

The following are four specific Diagnostic

Words (Base 10) and the situation that

produces them.

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 29 30

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