Campbell CSAT3B, Инструкция по эксплуатации, Страница: 41 / 88

CSAT3B Three-Dimensional Sonic Anemometer
The appropriate port and cable type to be used are determined by the chosen
communication method. TABLE 7-2 shows some of the criteria to use when
determining the best communication method for a given application. Once a
suitable method is determined, the appropriate combination of cables,
connectors, and lengths should be used (see Section 5.2.3.1, Power and
Communications Cables
, for information about ordering cables).
If the CSAT3B is going to be operated using SDM or CPI communications
where the datalogger triggers the measurement and the data are unfiltered (see
Mode 1 in Section 8.2, Operating Modes ), then the CSAT3B default settings
are appropriate and do not require modification. If, however, the CSAT3B will
be operated in another mode that either requires data filters or uses USB or RS-
485 communications, the settings must be modifying as described in Section
7.1, Settings .
Unlike previous CSAT3 models, the CSAT3B does not include
7.6 m (25 ft) lengths of all cable types. Only the 5 m (16 ft) USB
cable for initial configuration of the sensor is included. Other
cables must be ordered separately.
TABLE 7-2. Summary of Communications Options for the CSAT3B
SDM USB CPI RS-485
Data collection
Dataloggers:
• CR800
•
CR1000
•
CR3000
PC
Dataloggers:
• CR6
•
CR800 1
•
CR1000
1
• CR3000 1
PC
Cable length Medium Short, < 5 m Longest Long
Required cables CSAT3BCBL1 CSAT3BCBL2 and
USB cable (included)
CSAT3BCBL2 and
CSAT3BCBL3
CSAT3BCBL2 and
CSAT3BCBL3
Robustness Better Worse Best Better
Bandwidth OK Best Best OK
Synchronization with
other sensors
Best Worse Best Worse
Noisy environments OK OK Best Better
1 Requires using the SC-CPI Interface
7.7 Communications
There are many possible configurations of multiple CSAT3Bs and other
sensors on a single measurement station or system. Accordingly, power
requirements and sensor cable lengths should be taken into account to
appropriately power all sensors and avoid excess attenuation of signals. The
following sections describe different types of communications and different
configurations that may be helpful when designing the layout and
configuration of a system. For additional help, contact a Campbell Scientific
application engineer.
NOTE
31