Campbell Scientific SDM-CVO4 4-Channel Current/Voltage Output Module - Manual (Page 6)

SDM-CVO4 4-Channel Current/Voltage Output Module
The SDM-CVO4 is a synchronously addressed datalogger peripheral. The
datalogger’s SDM ports are used to address the SDM-CVO4 and send out data
that defines the desired voltage/current output of each of the four channels.
The output levels are set by four values stored in variables or successive input
locations in the datalogger. A total of up to sixteen SDM-CVO4s or other
SDM peripherals may be connected and addressed from the same three ‘SDM’
ports.
For the CR7, CR10(X), CR23X, and 21X dataloggers Instruction
103 is used to control the SDM-CVO4. This was introduced in
August 1988 for controlling SDM-AO4 functions. (The SDM-
AO4 is an older voltage-output-only peripheral.) Dataloggers
purchased before this date may use a different instruction. NOTE
The SDMCVO4 instruction is used with the CR800, CR850,
CR1000, CR3000, and CR5000.
2. Specifications
2.1 General Specifications
Compatible dataloggers: CR800, CR850, CR1000, CR3000, CR5000, and
CR7. Also compatible with many retired
dataloggers such as the CR10, 21X, and CR23X.
Operating voltage: 12 VDC nominal (8 V to 16 V)
Current drain at 12V DC: Typical active quiescent current 27 or 54 mA,
depending on operating mode (no load on output
ports). To estimate the total current, add the
quiescent current to the sum of all output currents
multiplied by 1.5.
E.g. if each port is at 10 mA output, the total =
54 + (1.5*4*10) = 114 mA. The device can be
shut down to <0.5 mA with all outputs off.
Maximum Total
SDM cable length:
600 ft (182 m) for the CR7; 20 ft (6 m) for other
dataloggers if the SDMSpeed Instruction is not
used. For our CR800, CR850, CR1000,
CR3000, and CR5000 dataloggers, cable lengths
longer than 20 ft may be acceptable if the
SDMSpeed instruction is used.
Operating temperature: -25 °C to +50°C standard (-40 to 80°C optional)
Size: 176 mm wide x 111 mm high x 24 mm deep.
234 mm wide x 111 mm high x 24 mm deep
when fitted with brackets for mounting in
enclosure, etc. Mounting brackets have two holes
at 203.2 mm (8") spacing for screw fixings.
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