Manual revision 013
Section 4: Deploying and Operating RS-232 SBE 38
SBE 38
18
Sampling
Commands
These commands are used to request data from the SBE 38.
For all sampling commands:
•
Output format is determined by
Format=
and
Digits=
.
•
Number of A/D cycles per sample is defined by
NAvg
.
Go
Start sampling data continuously, and transmit data
real-time.
Time between samples (seconds)
= (0.133 *
NAvg
) + 0.339
Stop
Stop continuous sampling. Press Enter key to get
S>
prompt before entering
Stop
.
TS
Take 1 sample and transmit data.
TH
Take 1 sample and hold data in SBE 38 buffer.
SH
Transmit data that was held in SBE 38 buffer.
SL
Transmit data from last sample from
SBE 38 buffer.
SLT
Transmit data from last sample from SBE 38
buffer, and then take 1 new sample and hold data
in buffer.
Calibration Coefficients
Commands
DC
Display calibration coefficients.
Equivalent to Coefficients on Toolbar.
The individual Coefficient Commands listed below modify a particular
coefficient or date:
TCalDate=S
S=
Temperature calibration date
A0=F
F=
Temperature A0
A1=F
F=
Temperature A1
A2=F
F=
Temperature A2
A3=F
F=
Temperature A3
Slope=F
F
=Temperature slope (default 1.0)
Offset=F
F
=Temperature offset (°C) (default 0.0)
Example:
Display coefficients for SBE 38 (user input in bold).
S>
DC
SBE 38 V 1.4 S/N = 0090
Cal Date:
08-apr-96
A0 =-9.420702e-05
A1 = 2.937924e-04
A2 =-3.739471e-06
A3 = 1.909551e-07
Slope = 1.000000
Offset = 0.0000
Notes:
•
Date shown is when calibration
was performed. Calibration
coefficients are initially factory-set
and should agree with Calibration
Certificate shipped with SBE 38.
•
See individual Coefficient
Commands below for definitions of
the data in the example.
Note:
F = floating point number
S = string with no spaces
Note:
You may need to send
Stop
several
times to get the SBE 38 to respond.
Notes:
•
To capture real-time data to a file,
do this
before
starting sampling:
1. Click Toolbar’s Capture button.
2. Enter desired file name in
dialog box.
Capture
status
displays in status bar at bottom
of screen.
•
If the SBE 38 is sampling data and
the voltage is less than 6.5 volts for
ten consecutive scans, the
SBE 38 halts sampling and sets
the status to
low battery
.
22
Summary of Contents for SBE 38
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