Campbell CSAT3B, Instruction Manual, Page: 42 / 88

CSAT3B Three-Dimensional Sonic Anemometer
For all communications types, if the total number of CSAT3Bs
and other sensors powered by the datalogger exceeds the limit of
output current from the datalogger, the power wires must be
connected to a separate 12 to 32 Vdc power supply. For long
cables, a higher voltage power supply is recommended as there
will be voltage loss over long distances.
Not all of the dataloggers that are compatible with the
CSAT3B support the same voltage input range as the
CSAT3B. While the CSAT3B supports voltage of up to
32 Vdc, many dataloggers require lower voltage. For
example, the CR800, CR1000, and CR3000 require 9.6 to
16 Vdc when connecting to the front panel voltage
input. If a CR3000 has a rechargeable base, then a 17
to 28 Vdc power supply may be connected to the base.
Unlike most of the dataloggers, the CR6 does support
up to 32 Vdc if the power supply is connected to the
CHG input terminals. For more details, refer to a
datalogger user manual.
7.7.1 SDM Communications
If data collection from the anemometer is to be accomplished using a
datalogger with SDM communications, connect a CSAT3BCBL1 to the
Power/SDM port by screwing in the M16 connector into the port until tight as
shown in FIGURE 7-8. No other cables are required for SDM
communications, as the CSAT3BCBL1 contains both power and SDM wiring.
If only one CSAT3B is being measured, the opposite end of the cable will have
wire pigtails if connecting directly to the ports on a datalogger. Refer to
Section 4.2, Communications Connections , for this wiring. Connect the white,
yellow, and blue wires to the SDM-C1 , SDM-C2 , and SDM-C3 ports
respectively, on a datalogger (FIGURE 7-9). On a datalogger or to another 9.5
to 32 Vdc power supply, connect the red and black wires to the 12 V and G
ports, respectively. See FIGURE 7-9 and TABLE 7-3 for wiring and wire
color designations.
For applications requiring very long cable lengths, a higher voltage power
supply is recommended as voltage drop over long distances will occur and the
CSAT3B requires a minimum of 9.5 Vdc.
NOTE
WARNING
32