Campbell CR10 PROM Instruction Manual download pdf (Page 18)

CSAT3 THREE DIMENSIONAL SONIC ANEMOMETER

13

EXAMPLE 1. Measuring the CSAT3 Using

the SDM Output and a CR23X Datalogger

;{CR23X}

;

;Flag 1 - Set low to configure the CSAT3.

*Table 1 Program

01: .1 Execution Interval (seconds)

;Get the data from the CSAT3.

;

01: SDM-CSAT3 (P107)

1: 1 Reps

2: 3 SDM Address

3: 91 Trigger and Get wind & Ts data

4: 1 Ux Input Location [ Ux_in ]

;Check the diagnostic word for lost trigger

;condition. Set Flag 1 low to reconfigure the

;CSAT3 if it is in a lost trigger state.

;

02: If (X<=>F) (P89)

1: 5 X Loc [ diag ]

2: 1 =

3: 61440 F

4: 21 Set Flag 1 Low

;Configure the CSAT3. This is done the first

;time through Table 1 or if the CSAT3 loses

;the trigger.

;

03: If Flag/Port (P91)

1: 21 Do if Flag 1 is Low

2: 30 Then Do

;Look for a diag that is not -99999,

;meaning that the CSAT3 is connected

;to the CR23X and the two devices are

;communicating correctly.

;

04: If (X<=>F) (P89)

1: 5 X Loc [ diag ]

2: 3 >=

3: 0 F

4: 30 Then Do

;Send the configuration command to the

;CSAT3 only if it is not acquiring the

;signal or making measurements, e.g.

;diag <> 61503.

;

05: If (X<=>F) (P89)

1: 5 X Loc [ diag ]

2: 2 <>

3: 61503 F

4: 30 Then Do

06: Do (P86)

1: 11 Set Flag 1 High

;Configure CSAT3 with 10 Hz parameters.

;

07: SDM-CSAT3 (P107)

1: 1 Reps

2: 3 SDM Address

3: 10 Set Execution Parameter

4: 1 Ux Input Location [ Ux_in ]

08: End (P95)

09: End (P95)

10: End (P95)

Input Locations

1 Ux_in

2 Uy_in

3 Uz_in

4 Ts_in

5 diag

11. MAINTENANCE

The CSAT3, like other ultrasonic anemometers,

is unable to measure wind when water droplets

are present on the face of the transducers. The

CSAT3 will be ready to measure wind as soon

as the water droplets evaporate or are removed

by the station operator. Remove the water

droplets by dabbing a cotton swab or tissue on

the face of the transducer. Execute the SDM-

CSAT3 instruction with the “Set Execution

Parameters” in option 3 to acquire the signal or

send the “An” command over the RS-232 link.

CAUTION: Lightly dab the face of the

transducers to remove water droplets.

Applying excessive force on the face of the

transducer may separate the matching layer

from the brass housing.

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