Sea-Bird Electronics SBE 38 Manual de usuario descargar pdf (Pagina 67)

Manual revision 006 Section 4: Deploying and Operating SBE 19plus V2 SBE 19plus V2

OutputFormat=0 (raw frequencies and voltages in Hex)

Data is output in the order listed, with no spaces or commas between

parameters. Shown with each parameter is the number of digits, and how to

calculate the parameter from the data (use the decimal equivalent of the hex

data in the equations).

1. Temperature A/D counts = tttttt

2. Conductivity frequency (Hz) = cccccc / 256

3. (if PType=1) Strain-gauge pressure sensor

pressure A/D counts = pppppp

4. (if PType=1) Strain-gauge pressure sensor

pressure temperature compensation voltage = vvvv / 13,107

5. (if PType=3) Quartz pressure sensor pressure

pressure frequency (Hz) = pppppp / 256

6. (if PType=3) Quartz pressure sensor temperature compensation

temperature compensation voltage = vvvv / 13,107

7. (if Volt0=Y) External voltage 0= vvvv / 13,107

8. (if Volt1=Y) External voltage 1 = vvvv / 13,107

9. (if Volt2=Y) External voltage 2 = vvvv / 13,107

10. (if Volt3=Y) External voltage 3 = vvvv / 13,107

11. (if Volt4=Y) External voltage 4 = vvvv / 13,107

12. (if Volt5=Y) External voltage 5 = vvvv / 13,107

13. (if SBE38=Y) SBE 38 temperature (°C, ITS-90) = (tttttt / 100,000) – 10

14. (if WetLabs=Y) WET Labs RS-232 sensor = wwwwxxxxyyyy

where wwww, xxxx, and yyyy are raw signal counts for each sensor;

yyyy all 0’s for dual sensor; xxxx and yyyy all 0’s for single sensor

15. (if GTD=Y or DualGTD=Y)

GTD #1 pressure (millibars) = pppppppp / 100,000

16. (if GTD=Y or DualGTD=Y)

GTD #1 temperature (°C, ITS-90) = (tttttt / 100,000) – 10

17. (if DualGTD=Y) GTD #2 pressure (millibars) = pppppppp / 100,000

18. (if DualGTD=Y)

GTD #2 temperature (°C, ITS-90) = (tttttt / 100,000) – 10

19. (if Optode=Y) Optode oxygen (micromoles/liter) = (oooooo / 10,000) – 10

20. Time (Moored mode [MM] only)

seconds since January 1, 2000 = ssssssss

Example: Profiling mode, strain-gauge pressure sensor, 2 external voltages sampled,

example scan = ttttttccccccppppppvvvvvvvvvvvv

= 0A53711BC7220C14C17D8203050594

• Temperature = tttttt = 0A5371 (676721 decimal);

temperature A/D counts = 676721

• Conductivity = cccccc = 1BC722 (1820450 decimal);

conductivity frequency = 1820450 / 256 = 7111.133 Hz

• Pressure = pppppp = 0C14C1 (791745 decimal);

pressure A/D counts = 791745

• Pressure sensor temperature compensation =

vvvv = 7D82 (32,130 decimal);

Pressure temperature = 32,130 / 13,107 = 2.4514 volts

• First external voltage = vvvv = 0305 (773 decimal);

voltage = 773 / 13,107 = 0.0590 volts

• Second external voltage = vvvv = 0594 (1428 decimal);

voltage = 1428 / 13,107 = 0.1089 volts

Notes:

• If you will be using Seasave to

acquire real-time data, you must set

OutputFormat=0.

• When using Seaterm232’s Upload

menu, Seaterm232 always uploads

data from memory in raw hex,

regardless of the user-programmed

format, providing the data in a format

that SBE Data Processing can use.

• Our software uses the equations

shown to perform these calculations;

alternatively, you can use the

equations to develop your own

processing software.

• The pressure sensor is an absolute

sensor, so its raw output includes

the effect of atmospheric pressure

(14.7 psi). As shown on the

Calibration Sheet, Sea-Bird’s

calibration (and resulting calibration

coefficients) is in terms of psia.

However, when outputting pressure

in engineering units, the 19plus V2

outputs pressure relative to the

ocean surface (i.e., at the surface

the output pressure is 0 decibars).

The 19plus V2 uses the following

equation to convert psia to decibars:

pressure (db) =

[pressure (psia) - 14.7] * 0.689476

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Sea-Bird Electronics SBE 38 Manual de usuario Pagina 67

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