Sequoia LISST-100X, Руководство пользователя

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76 LISST-100X User’s Guide
Depth Start : The built-in depth sensor of the LISST-100X is used to
check the current depth to determine if the desired start
depth has been exceeded. The instrument is powered up
and 5 measurements of the depth are averaged over a two-
second period. If the depth exceeds the threshold the
program will proceed to the data collection routine. If the
depth does not exceed the threshold the instrument will
power down and wait 28 seconds before checking the depth
again. The program will continue checking until the depth is
exceeded or until the program is stopped.
Time Start: The program will check the current time every second and
compare it to the Start Time. If the Start Time is equal to or
earlier than the current time the program will go directly to
the data collection routine. It will continue checking the time
until the Start Time is reached or until the program is
stopped.
External
Mechanical
Switch Start: The LISST-100X has a white plastic lever on the endcap.
This lever has a magnet imbedded in it. This magnet can
activate a switch inside the pressure case. The base
program looks at the status of this switch once a second. If
the switch is in the on or “1” positions the program will go
directly to the data collection routine. It will continue
checking the switch status until the switch is moved to the
“0” position or until the program is stopped. When in the “0”
position the lever is up against the zinc anode.
External Digital
Input Start: The LISST-100X is equipped with auxiliary inputs on the 6-
pin underwater connector. Pin 2 of the 6-pin connector is
the DIG 1 input. The program will check the status of the
digital input once a second. If the voltage at the DIG 1 input
is greater than 2 volts (relative to Digital Ground, Pin1) the
program will go directly to the data collection routine. It will
continue checking the status of the digital input until voltage
exceeds 2 volts or until the program is stopped.
WARNING :
The maximum permissible input voltage on the digital
input line is 3.3 volts.
Time Delay Start: The time delay start condition will cause the program to wait
the specified number of seconds before continuing on to the
data collection routine.
Data Collection
Routine The LISST-SOP software can configure the Base program
with one of six Stop conditions: Depth, Time. External
Mechanical Switch, External Digital Input, Fixed number of
samples, and Maximum Memory or Low Battery. The
details of each condition are described below.