Sequoia LISST-200X, Руководство пользователя

Страница: 66 / 112

LISST-200X Operation Details 58 LISST-
200X User’s Manual
Stop Conditions The possible stop conditions are:
1. Depth,
2. Time,
3. External Mechanical Switch,
4. External Digital Input,
5. Fixed number of samples, and
6. Memory full or power lost
When storing data in the Fixed Sample Rate mode the Stop conditions
are checked after each averaged sample has been saved. When
storing data in the Burst mode the Stop conditions are only checked
after a full Burst has been completed. The Start and Stop conditions
have no effect on the real-time sampling mode (Real-Time Data
Processing with LISST-200X Software on page 50). The details of each
condition are described below.
Depth Stop If the depth is less than the threshold, sampling will stop. If the Start
Condition is Depth Start the program will return to checking for the start
depth, and will start a new file each time the start threshold his crossed.
For all other Start Conditions the when the current depth is less than
the threshold the LISST-200X will stop and go into deep sleep.
If using depth for both start and stop conditions, consider whether the
start and stop thresholds should be different, depending on your
deployment scenario. For example, if the instrument might be
suspended from a winch at a depth near the start and stop thresholds,
there could be “false” starts and stops due to wave motion. This could
be prevented by setting the start depth deeper than the stop depth.
Time Stop After each sample or burst, if the given date and time have passed, the
LISST-200X will stop and go into low-power sleep.
External
Mechanical
Switch Stop After each sample or burst, i
f the switch lever is in the off or “0”
position, sampling will stop. If the Start Condition is Switch Start, the
program will return to checking the start condition. For all other Start
conditions the instrument will stop and go into deep sleep.
External Digital
Input Stop The status of the digital 1 input is checked after each sample or burst. If
the voltage at the input is less than 0.7 volts the sampling will stop. If
the Start Condition is a Digital Input Start the program will return to
checking the start condition. For all other Start conditions the
instrument will stop and go into deep sleep.
Fixed Number of
Samples When the number of samples to be saved has been reached the
program will stop and go into deep sleep (regardless of start condition).
Memory Full or
Voltage Low Sampling will continue until the memory is full, or the power input falls.
If the memory fills, the instrument will go into deep sleep.
NOTE: the memory capacity is large enough that it should never be
necessary to fill it. We recommend deleting files from the LISST-200X
as soon as they have been offloaded to a backed-up computer or other
storage.