Sea-Bird Electronics SBE 38 Manual de usuario descargar pdf (Pagina 19)

Section 2: Description of MicroTSG SBE 45

Sample Timing

The time to acquire the temperature and conductivity varies, depending on the

mode of operation.

Polled Sampling Mode

Polled Sampling Mode is in effect when:

• PCB J1 jumper is set to Normal or Autopower, AutoRun=N, and

sampling is started with Go (if SingleSample=Y) or with a polled

sampling command

Time from end of take sample command to beginning of reply (seconds)

= (NCycles * 0.1336) + 0.459

Autonomous Sampling Mode

Autonomous Sampling Mode is in effect when:

• PCB J1 jumper is set to Normal or Autopower, AutoRun=Y, and

SingleSample=N, or

• PCB J1 jumper is set to Normal (pins 2 and 3), AutoRun=N,

SingleSample=N, and sampling is started with Go

Time to acquire temperature and conductivity (seconds)

= (NCycles * 0.1336) + 0.287

Serial Line Sync Mode

Serial Line Sync Mode is in effect when:

• PCB J1 jumper set to Normal (pins 2 and 3), AutoRun=Y, and

SingleSample=Y

Time from wake-up to beginning of reply (seconds)

= (NCycles * 0.1336) + 1.643

Total Sampling Time

Once temperature and conductivity are acquired, the time to calculate the

desired parameters is not a function of the mode of operation:

• Time to compute temperature = 8.8 msec

• Time to compute conductivity = 15.4 msec

• Time to compute salinity = 83 msec

• Time to compute sound velocity = 35 msec

Total time required for sample =

time to acquire temperature and conductivity

+ time to compute selected parameters

+ time to transmit computed parameters

Notes:

• The time to transmit computed

parameters is dependent on baud

rate. See Baud Rate, Cable

Length, Power, and Data

Transmission Rate.

•

For autonomous sampling, if the

total time required for the sample

is greater than the user-input

sample interval (Interval=), the

MicroTSG begins the next sample

as soon as it finishes transmitting

the current sample.

Note:

See Command Descriptions in

Section 4: Setting Up MicroTSG

for descriptions of AutoRun=, Go,

SingleSample=, NCycles=, and

Interval=.

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 103 104

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Sea-Bird Electronics SBE 38 Manual de usuario Pagina 19

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