User`s manual

Manual revision 016 Section 4: Deploying and Operating FastCAT SBE 49
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Autonomous Sampling Commands
Autonomous sampling directs the FastCAT to sample data at 16 Hz and
transmit the data real-time. The FastCAT can be set to average up to
255 samples, transmitting only the averaged data. AutoRun defines how
autonomous sampling starts and stops:
IF
To Start Sampling
To Stop Sampling
AutoRun=N
(default)
Send Start.
• Turn off power, or
• Send Stop, click Stop on
Seaterm’s Toolbar, or type Ctrl Z.
(Stopping this way allows you to
then send commands to check or
modify the setup.)
AutoRun=Y
Turn on power.
NAvg=x x= number of samples to average
(default 1, maximum 255). FastCAT
samples at 16 Hz (every 0.0625 seconds)
and averages NAvg samples; averaged
data is transmitted real-time.
MinCondFreq=x x= minimum conductivity frequency (Hz)
to enable pump turn-on, to prevent pump
from turning on before FastCAT is in
water. Pump stops when frequency drops
below MinCondFreq.
FastCAT Configuration Sheet in manual
lists uncorrected (raw) frequency output at
0 conductivity. Typical value (factory-set)
for MinCondFreq for salt water and
estuarine application is:
(0 conductivity frequency + 500 Hz).
Typical value for MinCondFreq for fresh
water applications is:
(0 conductivity frequency + 5 Hz).
Default 3000 Hz.
PumpDelay=x x= time (seconds) to wait after minimum
conductivity frequency (MinCondFreq) is
reached before turning pump on. Pump
delay time allows time for tubing and
pump to fill with water after FastCAT is
submerged. Pump starts PumpDelay
seconds after conductivity cell’s frequency
output is greater than MinCondFreq.
Default 30 seconds.
Note:
In Seaterm, to save real-time data to a
file, click Capture on the Toolbar
before beginning sampling.
Example: If NAvg=8, FastCAT averages data from 8 samples
(= 1 average/0.5 second) and transmits averaged data real-time.